2009 IECC Based

2010 Florida Building Code

Chapter 1

Administration

Part 1 – SCOPE AND APPLICATION

SECTION 101

SCOPE AND GENERAL REQUIREMENTS

101.1 Title. This code shall be known as the Florida Building Code, Energy Conservation, International Energy Conservation Code of [NAME OF JURISDICTION], and shall be cited as such. It is referred to herein as “this code.”

101.2 Scope. This code applies to residential and commercial buildings. It is a statewide uniform code and shall not be made more stringent or lenient by local government (553.901, F.S.).

101.3 Intent. This code shall regulate the design and construction of buildings for the effective use of energy. This code is intended to provide flexibility to permit the use of innovative approaches and techniques to achieve the effective use of energy. This code is not intended to abridge safety, health or environmental requirements contained in other applicable codes or ordinances.

101.4 Applicability. Where, in any specific case, different sections of this code specify different materials, methods of construction or other requirements, the most restrictive shall govern. Where there is a conflict between a general requirement and a specific requirement, the specific requirement shall govern.

101.4.1 Existing buildings. Existing buildings shall meet the criteria in TABLE 101.4.1 as appropriate to the condition described. Except as specified in this chapter, this code shall not be used to require the removal, alteration or abandonment of, nor prevent the continued use and maintenance of, an existing building or building system lawfully in existence at the time of adoption of this code.

101.4.2 Historic buildings. Any building or structure as described in Section 267.021, Florida Statutes. Such buildings are typically .that is (553.902 F.S.) listed in the State or National Register of Historic Places; designated as a historic property under local or state designation law or survey; certified as a contributing resource with a National Register listed or locally designated historic district; or with an opinion or certification that the property is eligible to be listed on the National or State Registers of Historic Places either individually or as a contributing building to a historic district by the State Historic Preservation Officer or the Keeper of the National Register of Historic Places, are exempt from this code.

101.4.3 Additions, alterations, renovations or repairs. Additions, alterations, renovations or repairs to an existing building, building system or portion thereof shall conform to the provisions of Table 101.4.1 of this code as they relate to new construction without requiring the unaltered portion(s) of the existing building or building system to comply with this code. Additions, alterations, renovations or repairs shall not create an unsafe or hazardous condition or overload existing building systems. An addition shall be deemed to comply with this code if the addition alone complies or if the existing building and addition comply with this code as a single building.

Exception: The following need not comply provided the energy use of the building is not increased:

1. Storm windows installed over existing fenestration.

2. Glass only replacements in an existing sash and frame.

3. Existing ceiling, wall or floor cavities exposed during construction provided that these cavities are filled with insulation.

4. Construction where the existing roof, wall or floor cavity is not exposed.

5. Reroofing for roofs where neither the sheathing nor the insulation is exposed. Roofs without insulation in the cavity and where the sheathing or insulation is exposed during reroofing shall be insulated either above or below the sheathing.

6. Reserved. Replacement of existing doors that separate conditioned space from the exterior shall not require the installation of a vestibule or revolving door, provided, however, that an existing vestibule that separates a conditioned space from the exterior shall not be removed,

7. Alterations that replace less than 50 percent of the luminaires in a space, provided that such alterations do not increase the installed interior lighting power.

8. Alterations that replace only the bulb and ballast within the existing luminaires in a space provided that the alteration does not increase the installed interior lighting power.

101.4.4 Change in occupancy or use. Spaces undergoing a change in occupancy that would result in an increase in demand for either fossil fuel or electrical energy shall comply with this code. Where the use in a space changes from one use in Table 505.5.2 to another use in Table 505.5.2, the installed lighting wattage shall comply with Section 505.5.

101.4.5 Change in space conditioning. Any nonconditioned space that is altered to become conditioned space shall be required to be brought into full compliance with this code.

101.4.6 Mixed occupancy. Where a building includes both residential and commercial occupancies, each occupancy shall be separately considered and meet the applicable provisions of Chapter 4 for residential and Chapter 5 for commercial.

101.4.7 Building systems. (553.903, F.S.) Thermal efficiency standards are set for the following building systems where new products are installed or replaced in existing buildings, and for which a permit must be obtained. New products shall meet the minimum efficiencies allowed by this code for the following systems:

Heating, ventilating or air conditioning systems;

Service water or pool heating systems;

Electrical systems and motors;

Lighting systems.

Exceptions:

1. Where part of a functional unit is repaired or replaced. For example, replacement of an entire HVAC system is not required because a new compressor or other part does not meet code when installed with an older system.

2. If the unit being replaced is itself a functional unit, such as a condenser, it does not constitute a repair. Outdoor and indoor units that are not designed to be operated together must meet the U.S. Department of Energy certification requirements contained in Section 403.6.2.1.1. Matched systems are required; this match may be verified by any one of the following means:

a. AHRI data

b. Accredited laboratory

c. Manufacturer’s letter

d. Letter from registered P.E. State of Florida

3. Where existing components are utilized with a replacement system, such as air distribution system ducts or electrical wiring for lights, such components or controls need not meet code if meeting code would require that component’s replacement.

4. Replacement equipment that would require extensive revisions to other systems, equipment or elements of a building where such replacement is a like-for-like replacement, such as through-the-wall condensing units and PTACs, chillers, and cooling towers in confined spaces.

101.4.8 Exempt buildings.

101.4.8.1 Federal standards. Any building for which federal mandatory standards preempt state energy codes. (553.902 F.S.)

101.4.8.2 Hunting or recreational buildings < 1,000 square feet. Any building of less than l,000 square feet (93 m²) whose primary use is not as a principal residence and which is constructed and owned by a natural person for hunting or similar recreational purposes is exempt from this code; however, no such person may build more than one exempt building in any 12-month period. (553.905 F.S.)

TABLE 101.4.1

NONEXEMPT EXISTING BUILDINGS¹

	Permitted before March 1979	Permitted after March 1979
Addition	Meet code for addition^2,3
Not previously conditioned	Minimum efficiency levels shall be met for components being changed: Envelope: Section 402 or 502 Equipment: Section 403 or 503, 504 Lighting: Section 404 or 505	Considered an addition, meet current code
New building systems (HVAC, service hot water or pool heating, lighting, motors)	New products installed or replaced in existing buildings shall meet the minimum efficiency allowed for that system: Equipment: Section 403 or 503, 504 Lighting: Section 404 or 505 HVAC indoor and outdoor units ≤ 65,000 Btu/h that are not designed to operate together shall be matched. HVAC equipment sizing is required per Sections 403 or 503.
Occupancy type change	Minimum efficiency levels shall be met for components being changed: Envelope: Section 402 or 502 Equipment: Section 403 or 503, 504 Lighting: Section 404 or 505	Meet current code^3
Renovation^4	Minimum code envelope, equipment and lighting efficiency levels shall be met for components being changed: Envelope: Section 402 or 502 Equipment: Section 403 or 503, 504 Lighting: Section 404 or 505

¹ An existing building or portion thereof shall not be altered such that the building becomes less energy efficient than its existing condition.

² Minimum equipment efficiencies shall be met only when equipment is installed to specifically serve the addition or is being installed in conjunction with the construction of the addition.

³If an existing building is unable to meet one or more current prescriptive code minimum requirements, it may be exempt from those minimum requirements if the entire building is brought into compliance by Section 405 or Section 506, as applicable.

⁴ See definition of RENOVATION in Section 202.

101.5 Compliance. Residential buildings less than 4 stories shall meet the provisions of Chapter 4. Commercial buildings and residential buildings greater than 3 stories shall meet the provisions of Chapter 5.

101.5.1 Compliance materials. The Florida Building Commission code official shall be permitted to approve specific computer software, worksheets, compliance manuals and other similar materials that meet the intent of this code.

101.5.2 Low energy buildings. The following buildings, or portions thereof, separated from the remainder of the building by building thermal envelope assemblies complying with this code shall be exempt from the building thermal envelope provisions of this code:

1. Those with a peak design rate of energy usage less than 3.4 Btu/h·ft² (10.7 W/m²) or 1.0 watt/ft² (10.7 W/m²) of floor area for space conditioning purposes.

2. Those that do not contain conditioned space.

SECTION 102

ALTERNATE MATERIALS—METHOD OF CONSTRUCTION, DESIGN OR INSULATING SYSTEMS

102.1 General. This code is not intended to prevent the use of any material, method of construction, design or insulating system not specifically prescribed herein, provided that such construction, design or insulating system has been approved by the code official as meeting the intent of this code.

102.1.1 Above code programs. The Florida Building Commission code official or other authority having jurisdiction shall be permitted to deem a national, state or local energy efficiency program to exceed the energy efficiency required by this code. Buildings approved in writing by such an energy efficiency program shall be considered in compliance with this code. The requirements identified as “mandatory” in Chapters 4 and 5 of this code, as applicable, shall be met.

SECTION 103

CONSTRUCTION DOCUMENTS

103.1 General. Construction documents and other supporting data shall be submitted in one or more sets with each application for a permit. The construction documents shall be prepared by a registered design professional where required by the Florida Statutes of the jurisdiction in which the project is to be constructed. Where special conditions exist, the code official is authorized to require necessary construction documents to be prepared by a registered design professional.

Exception:

The code official is authorized to waive the requirements for construction documents or other supporting data if the code official determines they are not necessary to confirm compliance with this code.

103.2 Information on construction documents.

103.2.1 Code demonstration forms.

103.2.1.1 Residential ≤ 3 stories

103.2.1.1 Building thermal envelope alternative. An accurately completed Residential Building Form 402 or FlaResCheck printout shall be submitted to the building official for to demonstrate code compliance by this method.

103.2.1.2 Simulated performance alternative. An accurately completed Residential Building Form 405 (generated by the EnergyGauge USA Fla/Res computer program) shall be submitted to the building official to demonstrate code compliance by Section 405.

103.2.1.2Commercial and residential >3 stories.

103.2.2.1 Building thermal envelope alternative. An accurately completed Commercial Building Form 502 or FlaComCheck printout shall be submitted to the building official for to demonstrate code compliance by this method.

103.2.2.2 Simulated performance alternative, commercial and high-rise residential. An accurately completed Commerical Building Form 506 (generated by the EnergyGauge Summit Fla/Com computer program) demonstrating that code compliance has been achieved shall be submitted to the building official for compliance by Section 506.

103.2.2 Details required. Construction documents shall be drawn to scale upon suitable material. Electronic media documents are permitted to be submitted when approved by the code official. Construction documents shall be of sufficient clarity to indicate the location, nature and extent of the work proposed, and show in sufficient detail pertinent data and features of the building, systems and equipment as herein governed. Details shall include, but are not limited to, as applicable, insulation materials and their R-values; fenestration U-factors and SHGCs; area-weighted U-factor and SHGC calculations; mechanical system design criteria; mechanical and service water heating system and equipment types, sizes and efficiencies; economizer description; equipment and systems controls; fan motor horsepower (hp) and controls; duct sealing, duct and pipe insulation and location; lighting fixture schedule with wattage and control narrative; and air sealing details.

103.2.3 Compliance certification.

103.2.3.1 Code compliance demonstration.

103.2.3.1.1 Residential. No license or registration is required to prepare the code compliance form for single-family residential dwellings, duplexes and townhouses.

103.2.3.1.2 Commercial and multiple-family residential. Completion of procedures demonstrating compliance with this code for commercial buildings and multiple-family residential shall be signed and sealed by an architect or engineer licensed to practice in the state of Florida.

Exception.

Buildings excluded by Section 481.229, Florida Statutes, or Section 471.003, Florida Statute.. Calculations for buildings falling within the exception of Section 471.003, Florida Statutes, may be performed by air conditioning or mechanical contractors licensed in accordance with Chapter 489, Florida Statutes, or by state of Florida certified commercial building energy raters.

Design professionals responsible under Florida law for the design of lighting, electrical, mechanical, and plumbing systems and the building shell, shall certify compliance of those building systems with the code by signing and providing their professional registration number on the energy code form provided as part of the plans and specifications to the building department.

103.2.3.2 Code compliance certification. The building’s owner, the owner’s architect, or other authorized agent legally designated by the owner shall certify that the building is in compliance with the code, as per Section 553.907, Florida Statutes, prior to receiving the permit to begin construction or renovation.

103.3 Examination of documents. The code official shall examine or cause to be examined the accompanying construction documents and shall ascertain whether the construction indicated and described is in accordance with the requirements of this code and other pertinent laws or ordinances.

103.3.1 Approval of construction documents. When the code official issues a permit where construction documents are required, the construction documents shall be endorsed in writing and stamped “Reviewed for Code Compliance.” Such approved construction documents shall not be changed, modified or altered without authorization from the code official. Work shall be done in accordance with the approved construction documents.

One set of construction documents so reviewed shall be retained by the code official. The other set shall be returned to the applicant, kept at the site of work and shall be open to inspection by the code official or a duly authorized representative.

103.3.2 Previous approvals. This code shall not require changes in the construction documents, construction or designated occupancy of a structure for which a lawful permit has been heretofore issued or otherwise lawfully authorized, and the construction of which has been pursued in good faith within 180 days after the effective date of this code and has not been abandoned.

103.3.3 Phased approval. The code official shall have the authority to issue a permit for the construction of part of an energy conservation system before the construction documents for the entire system have been submitted or approved, provided adequate information and detailed statements have been filed complying with all pertinent requirements of this code. The holders of such permit shall proceed at their own risk without assurance that the permit for the entire energy conservation system will be granted

103.4 Amended construction documents. Changes made during construction that are not in compliance with the approved construction documents shall be resubmitted for approval as an amended set of construction documents.

103.5 Retention of construction documents. One set of approved construction documents shall be retained by the code official for a period of not less than 180 days from date of completion of the permitted work, or as required by state or local laws.

SECTION 104

INSPECTIONS

104.1 General. Construction or work for which a permit is required shall be subject to inspection by the code official.

104.2 Required approvals. Work shall not be done beyond the point indicated in each successive inspection without first obtaining the approval of the code official. The code official, upon notification, shall make the requested inspections and shall either indicate the portion of the construction that is satisfactory as completed, or notify the permit holder or his or her agent wherein the same fails to comply with this code. Any portions that do not comply shall be corrected and such portion shall not be covered or concealed until authorized by the code official.

104.3 Final inspection. The building shall have a final inspection and not be occupied until approved.

104.4 Reinspection. A building shall be reinspected when determined necessary by the code official

104.5 Approved inspection agencies. The code official is authorized to accept reports of approved inspection agencies, provided such agencies satisfy the requirements as to qualifications and reliability.

104.6 Inspection requests. It shall be the duty of the holder of the permit or their duly authorized agent to notify the code official when work is ready for inspection. It shall be the duty of the permit holder to provide access to and means for inspections of such work that are required by this code.

104.7 Reinspection and testing. Where any work or installation does not pass an initial test or inspection, the necessary corrections shall be made so as to achieve compliance with this code. The work or installation shall then be resubmitted to the code official for inspection and testing.

104.8 Approval. After the prescribed tests and inspections indicate that the work complies in all respects with this code, a notice of approval shall be issued by the code official.

104.8.1 Revocation. The code official is authorized to, in writing, suspend or revoke a notice of approval issued under the provisions of this code wherever the certificate is issued in error, or on the basis of incorrect information supplied, or where it is determined that the building or structure, premise, or portion thereof is in violation of any ordinance or regulation or any of the provisions of this code.

SECTION 105

VALIDITY

105.1 General. If a portion of this code is held to be illegal or void, such a decision shall not affect the validity of the remainder of this code.

SECTION 106

REFERENCED STANDARDS

106.1 General. The codes and standards referenced in this code shall be those listed in Chapter 6, and such codes and standards shall be considered as part of the requirements of this code to the prescribed extent of each such reference.

106.2 Conflicting requirements. Where the provisions of this code and the referenced standards conflict, the provisions of this code shall take precedence.

106.3Application of references. References to chapter or section numbers, or to provisions not specifically identified by number, shall be construed to refer to such chapter, section or provision of this code.

106.4 Other laws. The provisions of this code shall not be deemed to nullify any provisions of local, state or federal law.

SECTION 107

FEES

RESERVED

107.1 Fees. A permit shall not be issued until the fees prescribed in Section 107.2 have been paid, nor shall an amendment to a permit be released until the additional fee, if any, has been paid.

107.2 Schedule of permit fees. A fee for each permit shall be paid as required, in accordance with the schedule as established by the applicable governing authority.

107.3 Work commencing before permit issuance. Any person who commences any work before obtaining the necessary permits shall be subject to an additional fee established by the code official, which shall be in addition to the required permit fees.

107.4 Related fees. The payment of the fee for the construction, alteration, removal or demolition of work done in connection to or concurrently with the work or activity authorized by a permit shall not relieve the applicant or holder of the permit from the payment of other fees that are prescribed by law.

107.5 Refunds. The code official is authorized to establish a refund policy.

SECTION 108

STOP WORK ORDER

108.1 Authority. Whenever the code official finds any work regulated by this code being performed in a manner either contrary to the provisions of this code or dangerous or unsafe, the code official is authorized to issue a stop work order.

108.2 Issuance. The stop work order shall be in writing and shall be given to the owner of the property involved, or to the owner’s agent, or to the person doing the work. Upon issuance of a stop work order, the cited work shall immediately cease. The stop work order shall state the reason for the order, and the conditions under which the cited work will be permitted to resume.

108.3 Emergencies. Reserved. Where an emergency exists, the code official shall not be required to give a written notice prior to stopping the work.

108.4 Failure to comply. Any person who shall continue any work after having been served with a stop work order, except such work as that person is directed to perform to remove a violation or unsafe condition, shall be liable to a fine of not less than [AMOUNT] dollars or more than [AMOUNT] dollars subject to penalties as prescribed by law.

SECTION 109

BOARD OF APPEALS

RESERVED

109.1 General. In order to hear and decide appeals of orders, decisions or determinations made by the code official relative to the application and interpretation of this code, there shall be and is hereby created a board of appeals. The code official shall be an ex officio member of said board but shall have no vote on any matter before the board. The board of appeals shall be appointed by the governing body and shall hold office at its pleasure. The board shall adopt rules of procedure for conducting its business, and shall render all decisions and findings in writing to the appellant with a duplicate copy to the code official.

109.2 Limitations on authority. An application for appeal shall be based on a claim that the true intent of this code or the rules legally adopted there under have been incorrectly interpreted, the provisions of this code do not fully apply or an equally good or better form of construction is proposed. The board shall have no authority to waive requirements of this code.

109.3 Qualifications. The board of appeals shall consist of members who are qualified by experience and training and are not employees of the jurisdiction

SECTION 110

REPORTING (553.907 F.S.)

110.0 Reporting to the Department of Community Affairs. A reporting form shall be submitted to the local building department by the owner or owner’s agent with the submittal certifying compliance with this code. Reporting forms shall be a copy of the front page of the form applicable for the code chapter under which compliance is demonstrated.

110.1 Reporting schedule. It shall be the responsibility of the local building official to forward the reporting section of the proper form to the Department of Community Affairs on a quarterly basis as per the reporting schedule in Appendix A.

TABLE 110.1

REPORTING SCHEDULE

Group I* Group II* Group III*

Quarter 1 12/31 1/31 2/28

Quarter 2 3/31 4/30 5/31

Quarter 3 6/30 7/31 8/31

Quarter 4 9/30 10/31 11/30

*See Appendix 13-A of this chapter for group designations.

CHAPTER 2

DEFINITIONS

SECTION 201

GENERAL

201.1 Scope. Unless stated otherwise, the following words and terms in this code shall have the meanings indicated in this chapter.

201.2 Interchangeability. Words used in the present tense include the future; words in the masculine gender include the feminine and neuter; the singular number includes the plural and the plural includes the singular.

201.3 Terms defined in other codes. Terms that are not defined in this code but are defined in the Florida Building Code, International Building Code, the International Fire Code, International Florida Building Code, Fuel Gas Code, the Florida Building Code, International Mechanical Code, the Florida Building Code, International Plumbing Code or the Florida Building Code, International Residential Code shall have the meanings ascribed to them in those codes.

201.4 Terms not defined. Terms not defined by this chapter shall have the meanings stated in ANSI/ASHRAE/IESNA Standard 90.1, in codes referenced from Section 201.3, in Webster's Ninth New Collegiate Dictionary, as revised, or in ordinarily accepted meanings such as the context implies.

SECTION 202

GENERAL DEFINITIONS

[Definitions will be added later once the extent of code requirements is determined.]

CHAPTER 3

CLIMATE ZONES

SECTION 301

CLIMATE ZONES

301.1 General. Climate zones from Figure 301.1 or Table 301.1 shall be used in determining the applicable requirements from Chapters 4 and 5. Locations not in Table 301.1 (outside the United States) shall be assigned a climate zone based on Section 301.3.

301.2Warm humid counties. All Florida counties are considered Wwarm humid counties are identified in Table 301.1 by an asterisk.

TABLE 301.1

FLORIDA CLIMATE ZONES, MOISTURE REGIMES, AND WARM-HUMID DESIGNATIONS

BY STATE, COUNTY AND TERRITORY

Key: A – Moist, Asterisk (*) indicates a warm-humid location.

COUNTY	CLIMATE ZONE	COUNTY	CLIMATE ZONE	COUNTY	CLIMATE ZONE
Alachua	2A*	Hardee	2A*	Okeechobee	2A*
Baker	2A*	Hendry	2A*	Orange	2A*
Bay	2A*	Hernando	2A*	Osceola	2A*
Bradford	2A*	Highlands	2A*	Palm Beach	2A*
Brevard	2A*	Hillsborough	2A*	Pasco	2A*
Broward	1A*	Holmes	2A*	Pinellas	2A*
Calhoun	2A*	Indian River	2A*	Polk	2A*
Charlotte	2A*	Jackson	2A*	Putnam	2A*
Citrus	2A*	Jefferson	2A*	Santa Rosa	2A*
Clay	2A*	Lafayette	2A*	Sarasota	2A*
Collier	2A*	Lake	2A*	Seminole	2A*
Columbia	2A*	Lee	2A*	St. Johns	2A*
DeSoto	2A*	Leon	2A*	St. Lucie	2A*
Dixie	2A*	Levy	2A*	Sumter	2A*
Duval	2A*	Liberty	2A*	Suwannee	2A*
Escambia	2A*	Madison	2A*	Taylor	2A*
Flagler	2A*	Manatee	2A*	Union	2A*
Franklin	2A*	Marion	2A*	Volusia	2A*
Gadsden	2A*	Martin	2A*	Wakulla	2A*
Gilchrist	2A*	Miami-Dade	1A*	Walton	2A*
Glades	2A*	Monroe	1A*	Washington	2A*
Gulf	2A*	Nassau	2A*
Hamilton	2A*	Okaloosa	2A*

TABLE 301.3(1)

INTERNATIONAL CLIMATE ZONE DEFINITIONS

MAJOR CLIMATE TYPE DEFINITIONS

Warm-humid Definition—Moist (A) locations where either of the following wet-bulb temperature conditions shall occur during the warmest six consecutive months of the year:

1. 67^oF (19.4^oC) or higher for 3,000 or more hours; or
2. 73^oF (22.8^oC) or higher for 1,500 or more hours

Dry (B) Definition – Locations meeting the following criteria: Not marine and

Pm< 0.44 x (TF – 19.5) [P_cm < 2.0 x (TC + 7) in SI units]

Where:

P_in = Annual precipitation in inches (cm)

T = Annual mean temperature in ^oF (^oC)

Moist (A) Definition – Locations that are not marine and not dry.

For SI: ^oC = [(^oF) – 32]/1.8; 1 inch = 2.54 cm.

TABLE 301.3(2)

INTERNATIONAL CLIMATE ZONE DEFINITIONS

ZONE NUMBER	THERMAL CRITERIA
	IP Units	SI Units
1	9000 < CDD50^oF	5000 < CDD 10^oC.
2	6300 < CDD 50^oF ≤ 9000	3500 < CDD 10^oC ≤ 5000

For SI: ^oC = [(^oF) – 32]/1.8

301.3 International cClimate zones. The climate zone for any location outside the United States shall be determined by applying Table 301.3(1) and then Table 301.3(2). Code compliance shall be specific to the building location and Table 301.1.

SECTION 302

DESIGN CONDITIONS

302.1 Interior design conditions. The interior design temperatures used for heating and cooling load calculations shall be a maximum of 72ºF (22ºC) for heating and minimum of 75ºF (24ºC) for cooling.

SECTION 303

MATERIALS, SYSTEMS AND EQUIPMENT

303.1 Identification. Materials, systems and equipment shall be identified in a manner that will allow a determination of compliance with the applicable provisions of this code.

303.1.1 Building thermal envelope insulation. An R-value identification mark shall be applied by the manufacturer to each piece of building thermal envelope insulation 12 inches (305 mm) or greater in width. Alternately, the insulation installers shall provide a certification listing the type, manufacturer and R-value of insulation installed in each element of the building thermal envelope. For blown or sprayed insulation (fiberglass and cellulose), the initial installed thickness, settled thickness, settled R-value, installed density, coverage area and number of bags installed shall be listed on the certification. For sprayed polyurethane foam (SPF) insulation, the installed thickness of the areas covered and R-value of installed thickness shall be listed on the certification. The insulation installer shall sign, date and post the certification in a conspicuous location on the job site.

303.1.1.1 Blown or sprayed roof/ceiling insulation. The thickness of blown-in or sprayed roof/ceiling insulation (fiberglass or cellulose) shall be written in inches (mm) on markers that are installed at least one for every 300 square feet (28 m2) throughout the attic space. The markers shall be affixed to the trusses or joists and marked with the minimum initial installed thickness with numbers a minimum of 1 inch (25 mm) in height. Each marker shall face the attic access opening. Spray polyurethane foam thickness and installed R-value shall be listed on certification provided by the insulation installer

303.1.2 Insulation mark installation. Insulating materials shall be installed such that the manufacturer’s R-value mark is readily observable upon inspection.

303.1.3 Fenestration product rating. U-factors of fenestration products (windows, doors and skylights) shall be determined in accordance with NFRC 100 by an accredited, independent laboratory, and labeled and certified by the manufacturer. Products lacking such a labeled U-factor shall be assigned a default U-factor from Table 303.1.3(1) or 303.1.3(2). The solar heat gain coefficient (SHGC) of glazed fenestration products (windows, glazed doors and skylights) shall be determined in accordance with NFRC 200 by an accredited, independent laboratory, and labeled and certified by the manufacturer. Products lacking such a labeled SHGC shall be assigned a default SHGC from Table 303.1.3(3).

TABLE 303.1.3(1)

DEFAULT GLAZED FENESTRATION U-FACTOR

Frame Type	Single Pane	Double pane	Skylight
			Single	Double
Metal	1.20	0.80	2.00	1.30
Metal with thermal break	1.10	0.65	1.90	1.10
Nonmetal or metal clad	0.95	0.55	1.75	1.05
Glazed block	0.60

TABLE 303.1.3(2)

DEFAULT DOOR U-FACTORS

Door Type	U-Factor
Uninsulated metal	1.20
Insulated metal	0.60
Wood	0.50
Insulated, nonmetal edge, max. 45% glazing, any glazing double pane	0.35

TABLE 303.1.3(3)

DEFAULT GLAZED FENESTRATION SHGC

Single Glazed		Double Glazed		Glazed Block
Clear	Tinted	Clear	Tinted
0.8	0.7	0.7	0.6	0.6

303.1.4 Insulation product rating. The thermal resistance (R-value) of insulation shall be determined in accordance with the U.S. Federal Trade Commission R-value rule (CFR Title 16, Part 460, May 31, 2005) in units of h _ ft2 _ °F/Btu at a mean temperature of 75°F (24°C).

303.2 Installation. All materials, systems and equipment shall be installed in accordance with the manufacturer’s installation instructions and the Florida International Building Code.

303.2.1 Protection of exposed foundation insulation. Insulation applied to the exterior of basement walls, crawlspace walls and the perimeter of slab-on-grade floors shall have a rigid, opaque and weather-resistant protective covering to prevent the degradation of the insulation’s thermal performance. The protective covering shall cover the exposed exterior insulation and extend a minimum of 6 inches (153 mm) below grade.

303.3 Maintenance information. Maintenance instructions shall be furnished for equipment and systems that require preventive maintenance. Required regular maintenance actions shall be clearly stated and incorporated on a readily accessible label. The label shall include the title or publication number for the operation and maintenance manual for that particular model and type of product.

303.3.1 Commercial buildings. The code official shall ensure that the construction documents require an operating and maintenance manual be transmitted to the building owner for all commercial buildings. The manual shall include basic data relating to the design, operation and maintenance of HVAC and lighting systems and equipment. Required routine maintenance actions shall be clearly identified. Where applicable, control information such as diagrams, schematics, control sequence descriptions, and maintenance and calibration information shall be included. [from ASHRAE 90.1]

Chapter 4

Residential Energy Efficiency

SECTION 401

GENERAL

401.1 Scope. This chapter applies to residential buildings

401.2 Compliance. Projects shall comply with Sections 401, 402.4, 402.5, and 403.1, 403.2.2, 403.2.3, and 403.3 through 403.9 (referred to as the mandatory provisions) and either:

1. Sections 402.1 through 402.3, 403.2.1 and 404.1 (prescriptive); or

2. Section 405 (performance).

401.3 Certificate. Energy performance level (EPL) display card. The building official shall require that an energy performance level (EPL) display card be completed and certified by the builder to be accurate and correct before final approval of the building for occupancy. Florida law (Section 553.9085, Florida Statutes) requires the EPL display card to be included as an addendum to each sales contract for both presold and nonpresold residential buildings. The EPL display card contains information indicating the energy performance level and efficiencies of components installed in a dwelling unit. The building official shall verify that the EPL display card completed and signed by the builder accurately reflects the plans and specifications submitted to demonstrate code compliance for the building. The EPL display card A permanent certificate shall also be posted on or in the electrical distribution panel and . The certificate shall not cover or obstruct the visibility of the circuit directory label, service disconnect label or other required labels. The certificate shall be completed by the builder or registered design professional. The certificate shall list the predominant R-values of insulation installed in or on ceiling/roof, walls, foundation (slab, basement wall, crawlspace wall and/or floor) and ducts outside conditioned spaces; U-factors for fenestration and the solar heat gain coefficient (SHGC) of fenestration. Where there is more than one value for each component, the certificate shall list the value covering the largest area. The certificate shall list the types and efficiencies of heating, cooling and service water heating equipment. Where a gas-fired unvented room heater, electric furnace, or baseboard electric heater is installed in the residence, the certificate shall list “gas-fired unvented room heater,” “electric furnace” or “baseboard electric heater,” as appropriate. An efficiency shall not be listed for gas-fired unvented room heaters, electric furnaces or electric baseboard heaters.

SECTION 402

BUILDING THERMAL ENVELOPE

402.1 General (Prescriptive).

402.1.1 Insulation and fenestration criteria. The building thermal envelope shall meet the requirements of Table 402.1.1 based on the climate zone specified in Chapter 3.

402.1.1.1.2 R-value computation. Insulation material used in layers, such as framing cavity insulation and insulating sheathing, shall be summed to compute the component R-value. The manufacturer’s settled R-value shall be used for blown insulation. Computed R-values shall not include an R-value for other building materials or air films.

TABLE 402.1.1

INSULATION AND FENESTRATION REQUIREMENTS BY COMPONENT^a

COMPONENT EFFICIENCIES REQUIRED^a,l

Climate Zone OPTION Percent Glazing^c

Fenestration U-Factor^b

Sky-light^b U-Factor

Glazed Fenes- tration SHGC^b,e

Ceiling R-value/ Attic Radiant Barrier^e

Roof Reflectance Tested per S. 405.5.5.2

Wood Frame Wall R-value

Mass Wall R-value^i

Floor R-value/ Slab R-value^d

Basement^c Wall R-value Door U-Factor

Slab^dR-value & Depth Ducts: R-value/ Location^k

Crawl Space^c Wall R-value Air Handler Location^k^,

Air Leakage Tested per S. 403.2.2.1

1 13%

0.65^j

0.75

0.30

38/No

0.25

13

6 / 7.8

13/0

0.65

R-8/ Unconditioned

Unconditioned

Qn=0.03

2 16%

0.65^j

0.75

0.30

30/Yes

0.25

13

6 / 7.8

13/0

0.65

R-8/ Unconditioned

Unconditioned

Qn=0.03

3 20%

0.65^j

0.75

0.30

30/No

0.25

13

6 / 7.8

13/0

0.65

R-6/ Conditioned

Conditioned

Qn=0.03

For SI: 1 foot = 304.8 mm.

a. R-values are minimums. U-factors and SHGC are maximums. R-19 batts compressed into a nominal 2 × 6 framing cavity such that the R-value is reduced by R-1 or more shall be marked with the compressed batt R-value in addition to the full thickness R-value.

b. The fenestration U-factor column excludes skylights. The SHGC column applies to all glazed fenestration.

c. Percent glazing shown in the Option column shall be the maximum glazing allowed for that option. Percent glazing area shall be measured in window to floor area and shall include skylight area. PERCENT TO BE DETERMINED BY SELECTION OF OPTION

“15/19” means R-15 continuous insulated sheathing on the interior or exterior of the home or R-19 cavity insulation at the interior of the basement wall. “15/19” shall be permitted to be met with R-13 cavity insulation on the interior of the basement wall plus R-5 continuous insulated sheathing on the interior or exterior of the home. “10/13” means R-10 continuous insulated sheathing on the interior or exterior of the home or R-13 cavity insulation at the interior of the basement wall.

d. R-5 shall be added to the required slab edge R-values for heated slabs only;. Iinsulation depth shall be the depth of the footing or 2 feet, whichever is less in Zones 1through 3 for heated slabs. No insulation is required for unheated slabs, basement walls or crawl space walls.

e. A sheet radiant barrier shall be installed in the attic in accordance with Section 405.5.5.1. There are no SHGC requirements in the Marine Zone.

f. Basement wall insulation is not required in warm-humid locations as defined by Figure 301.1 and Table 301.1.

g. Or insulation sufficient to fill the framing cavity, R-19 minimum.

h. “13+5” means R-13 cavity insulation plus R-5 insulated sheathing. If structural sheathing covers 25 percent or less of the exterior, insulating sheathing is not required where structural sheathing is used. If structural sheathing covers more than 25 percent of exterior, structural sheathing shall be supplemented with insulated sheathing of at least R-2.

i. The second R-value applies when more than half the insulation is on the interior of the mass wall.

j. For impact rated fenestration complying with Section R301.2.1.2 of the International Florida Building Residential Code, Residential or Section 1609.1.2 of the International Florida Building Code, Building the maximum U-factor shall be 0.75 in Zone 2 and 0.65 in Zone 3.

k. Conditioned= entire distribution system located inside both the thermal and air barrier of the home. Unconditioned = any portion located in unconditioned space.

l. Limitations to compliance by Section 402 found in Section 402.2 shall be met.

TABLE 402.1.3

EQUIVALENT U-FACTORS^a,f

Climate Zone	Fenestration U-Factor^e	Skylight U-Factor	Ceiling U-Factor	Frame Wall U-Factor	Mass Wall U-Factor^b	Floor U-Factor	Basement Wall U-Factor^d	Crawl Space Wall U-Factor^c
1	0.65 1.20	0.75	0.035	0.082	0.124	0.064	0.360	0.477
2	0.65	0.75	0.035	0.082	0.124	0.064	0.360	0.477

a. Nonfenestration U-factors shall be obtained from measurement, calculation or an approved source.

b. When more than half the insulation is on the interior, the mass wall U-factors shall be a maximum of 0.102 in Zone 1 and, 0..102 in Zone 2, 0.12 in Zone 3, 0.10 in Zone 4 except Marine, and the same as the frame wall U-factor in Marine Zone 4 and Zones 5 through 8.

c. Basement wall U-factor of 0.360 in warm-humid locations as defined by Figure 301.1 and Table 301.2.

d. Foundation U-factor requirements shown in Table 402.1.3 include wall construction and interior air films but exclude soil conductivity and exterior air films. U-factors for determining code compliance in accordance with Section 402.1.4 (total UA alternative) of Section 405 (Simulated Performance Alternative) shall be modified to include soil conductivity and exterior air films.

e. Window to floor area shall not exceed X percent. See Section 402.1.2.3. PERCENT TO BE DETERMINED BY SELECTION OF OPTION FOR TABLE 402.1.1

f. Limitations to compliance by Section 402 found in Section 402.2 shall be met.

[Additional caveats may be required based on options chosen for Table 402.1.1]

402.1.1.2. 3 U-factor alternative. An assembly with a U-factor equal to or less than that specified in Table 402.1.3 shall be permitted as an alternative to the corresponding component R-value in Table 402.1.1. All other prescriptive criteria of Table 402.1, the prescriptive criteria in Section 402.1.5 and footnotes to Table 402.1.3 shall be met.

402.1.1.3 4 Total UA alternative. If the total building thermal envelope UA (sum of U-factor times assembly area) is less than or equal to the total UA resulting from using the U-factors in Table 402.1.3 (multiplied by the same assembly area as in the proposed building), the building shall be considered in compliance with Table 402.1.1. All other prescriptive criteria of Table 402.1, the prescriptive criteria in Section 402.1.5 and footnotes to Table 402.1.3 shall be met. The UA calculation shall be done using a method consistent with the ASHRAE Handbook of Fundamentals and shall include the thermal bridging effects of framing materials. The SHGC requirements shall be met in addition to UA compliance.

402.1.2 Limitations to compliance by Section 402.

402.1.2.1 Electric space heating. Electric resistance space heating systems shall not be used when complying with this code by Section 402.

402.1.2.2 Air handlers in attics. Air handlers may not be installed in attics when complying with Section 402.

402.1.2.3 Maximum percent window area. The window area as a percentage of the conditioned floor area (CFA) shall not exceed the percent glazing listed for the code compliance Option chosen in Table 402.1.1.

Exceptions: The follow exceptions apply to additions.

1. When a fenestration(s) in an existing exterior wall is being removed or enclosed by an addition, an amount equal to the total area of this fenestration may be subtracted from the total glass area prior to determining the installed glass percentage.

2. Additions of 600 square feet (56 m²) or less may have up to 50 percent glass to conditioned floor area.

3. Glass windows and doors that were previously located in an existing exterior wall that is being removed or enclosed by an addition do not have to comply with the U-factor and solar heat gain coefficient requirements in Table 402.1.1 when reinstalled as part of the addition.

402.1.2.4 Air handlers in attics. Air handlers may not be installed in attics when complying with Section 402.

402.1.2.5 Equipment efficiencies. Minimum equipment efficiencies for cooling, heating and water heating shall be code minimums as per Sections 403.4 and 403.6.

402.2 Specific insulation requirements (Prescriptive).

402.2.1Ceilings with attic spaces. When Section 402.1.1 would require R-38 in the ceiling, R-30 shall be deemed to satisfy the requirement for R-38 wherever the full height of uncompressed R-30 insulation extends over the wall top plate at the eaves. Similarly, R-38 shall be deemed to satisfy the requirement for R-49 wherever the full height of uncompressed R-38 insulation extends over the wall top plate at the eaves. This reduction shall not apply to the U-factor alternative approach in Section 402.1.3 and the total UA alternative in Section 402.1.4.

402.2.2 Ceilings without attic spaces. Where Section 402.1.1 would require insulation levels above R-30 and the design of the roof/ceiling assembly does not allow sufficient space for the required insulation, the minimum required insulation for such roof/ceiling assemblies shall be R-30. This reduction of insulation from the requirements of Section 402.1.1 shall be limited to 500 square feet (46m2) or 20 percent of the total insulated ceiling area, whichever is less. This reduction shall not apply to the U-factor alternative approach in Section 402.1.3 and the total UA alternative in Section 402.1.4

402.2.3 Access hatches and doors. Access doors from conditioned spaces to unconditioned spaces (e.g., attics and crawl spaces) shall be weatherstripped and insulated to a level equivalent to the insulation on the surrounding surfaces. Access shall be provided to all equipment that prevents damaging or compressing the insulation. A wood framed or equivalent baffle or retainer is required to be provided when loose fill insulation is installed, the purpose of which is to prevent the loose fill insulation from spilling into the living space when the attic access is opened, and to provide a permanent means of maintaining the installed -value of the loose fill insulation.

402.2.4 Mass walls. Mass walls for the purposes of this chapter shall be considered above-grade walls of concrete block, concrete, insulated concrete form (ICF), masonry cavity, brick (other than brick veneer), earth (adobe, compressed earth block, rammed earth) and solid timber/logs.

402.2.5 Steel-frame ceilings, walls, and floors. Steel frame ceilings, walls and floors shall meet the insulation requirements of Table 402.2.5 or shall meet the U-factor requirements in Table 402.1.3. The calculation of the U-factor for a steel-frame envelope assembly shall use a series-parallel path calculation method.

Exception: In Climate Zones 1 and 2, the continuous insulation requirements in Table 402.2.54 shall be permitted to be reduced to R-3 for steel frame wall assemblies with studs spaced at 24 inches (610 mm) on center.

402.2.6 Floors. Floor insulation shall be installed to maintain permanent contact with the underside of the subfloor decking.

402.2.7 Basement walls. Walls associated with conditioned basements shall be insulated from the top of the basement wall down to 10 feet (3048 mm) below grade or to the basement floor, whichever is less. Walls associated with unconditioned basements shall meet this requirement unless the floor overhead is insulated in accordance with Sections 402.1.1 and 402.2.6.

TABLE 402.2.5

STEEL-FRAME CEILING, WALL AND FLOOR INSULATION

(R-VALUE)

Wood Frame R-Value Requirement	Cold-Formed Steel Equivalent R-value^a
Steel Truss Ceilings^b
R-30	R-38 or R-30 + 3 or R-26 + 5
R-38	R-49 or R-38 + 3
R-49	R-38 + 5
Steel Joist Ceilings^b
R-30	R-38 in 2x4 or 2x6 or 2x8 R-49 in any framing
R-38	R-49 in 2x4 or 2x6 or 2x8 or 2x10
Steel-Framed Wall
R-13	R-13 + 5 or R-15 + 4 or R-21 + 3 or R-0 + 10
R-19	R-13 + 9 or R-19 + 8 or R-25 + 7
R-21	R-13 + 10 or R-19 + 9 or R-25 + 8
Steel Joist Floor
R-13	R-19 in 2x6 R-19 + 6 in 2x8 or 2x10
R-19	R-19 + 6 in 2x6 R-19 + 12 in 2x8 or 2x10

a. Cavity insulation R- value is listed first, followed by continuous insulation R- value.

b. Insulation exceeding the height of the framing shall cover the framing.

402.2.8 Slab-on-grade floors. Reserved. Slab-on-grade floors with a floor surface less than 12 inches (305 mm) below grade shall be insulated in accordance with Table 402.1.1. The insulation shall extend downward from the top of the slab on the outside or inside of the foundation wall. Insulation located below grade shall be extended the distance provided in Table 402.1.1 by any combination of vertical insulation, insulation extending under the slab or insulation extending out from the building. Insulation extending away from the building shall be protected by pavement or by a minimum of 10 inches (254 mm) of soil. The top edge of the insulation installed between the exterior wall and the edge of the interior slab shall be permitted to be cut at a 45-degree (0.79 rad) angle away from the exterior wall. Slab-edge insulation is not required in jurisdictions designated by the code official as having a very heavy termite infestation.

402.2.9 Crawl space walls. As an alternative to insulating floors over crawl spaces, crawl space walls shall be permitted to be insulated when the crawl space is not vented to the outside. Crawl space wall insulation shall be permanently fastened to the wall and extend downward from the floor to the finished grade level and then vertically and/or horizontally for at least an additional 24 inches (610 mm). Exposed earth in unvented crawl space foundations shall be covered with a continuous Class I vapor retarder. All joints of the vapor retarder shall overlap by 6 inches (153 mm) and be sealed or taped. The edges of the vapor retarder shall extend at least 6 inches (153 mm) up the stem wall and shall be attached to the stem wall.

402.2.10 Masonry veneer. Insulation shall not be required on the horizontal portion of the foundation that supports a masonry veneer.

402.2.11 Thermally isolated sunroom insulation. The minimum ceiling insulation R-values shall be R-19 in Zones 1 through 4 and R-24 in Zones 5 through 8. The minimum wall R-value shall be R-13 in all zones. New wall(s) separating a sunroom from conditioned space shall meet the building thermal envelope requirements

402.2.12 Common walls/ceilings/floors. Walls, ceilings or floors common to separate conditioned tenancies shall be insulated to a minimum R-11, space permitting.

Exception: Mass common walls shall be insulated to a minimum of R-6.

402.2.13 Walls considered ceiling area. Wall areas that separate conditioned living space from unconditioned attic space (such as attic knee walls, walls on cathedral ceilings, skylight chimney shafts, gambrel roofs, etc.) shall be considered ceiling area. Such areas shall be included in calculations of ceiling area and shall have a minimum insulation value of R-19.

402.3 Fenestration. (Prescriptive).

402.3.1 U-factor. An area-weighted average of fenestration products shall be permitted to satisfy the U-factor requirements.

402.3.2 Glazed fenestration SHGC. An area-weighted average of fenestration products more than 50 percent glazed shall be permitted to satisfy the SHGC requirements

402.3.3 Glazed fenestration exemption. Up to 15 square feet (1.4m2) of glazed fenestration per dwelling unit shall be permitted to be exempt from U-factor and SHGC requirements in Section 402.1.1. This exemption shall not apply to the U-factor alternative approach in Section 402.1.3 and the Total UA alternative in Section 402.1.4.

402.3.4 Opaque door exemption. One side-hinged opaque door assembly up to 24 square feet (2.22 m2) in area is exempted from the U-factor requirement in Section 402.1.1. This exemption shall not apply to the U-factor alternative approach in Section 402.1.3 and the total UA alternative in Section 402.1.4

402.3.5 Thermally isolated sunroom U-factor. For Zones 4 through 8, the maximum fenestration U-factor shall be 0.50 and the maximum skylight U-factor shall be 0.75. New windows and doors separating the sunroom from conditioned space shall meet the building thermal envelope requirements.

402.3.6 Replacement fenestration. Where some or all of an existing fenestration unit is replaced with a new fenestration product, including sash and glazing, the replacement fenestration unit shall meet the applicable requirements for U-factor and SHGC in Table 402.1.1.

402.4 Air leakage (Mandatory).

402.4.1 Building thermal envelope. The building thermal envelope shall be durably sealed to limit infiltration. The sealing methods between dissimilar materials shall allow for differential expansion and contraction. The following shall be caulked, gasketed, weatherstripped or otherwise sealed with an air barrier material, suitable film or solid material:

1. All joints, seams and penetrations.

2. Site-built windows, doors and skylights.

3. Openings between window and door assemblies and their respective jambs and framing.

4. Utility penetrations.

5. Dropped ceilings or chases adjacent to the thermal envelope.

6. Knee walls.

7. Walls and ceilings separating a garage from conditioned spaces.

8. Behind tubs and showers on exterior walls.

9. Common walls between dwelling units.

10. Attic access openings.

11. Rim joist junction.

12. Other sources of infiltration.

402.4.2 Air sealing and insulation. Building envelope air tightness and insulation installation shall be demonstrated to comply with one of the following options given by Section 402.4.2.1 or 402.4.2.2

402.4.2.1 Testing option. Building envelope tightness and insulation installation shall be considered acceptable when tested air leakage is less than seven air changes per hour (ACH) when tested with a blower door at a pressure of 33.5 psf (50 Pa). Testing shall occur after rough in and after installation of penetrations of the building envelope, including penetrations for utilities, plumbing, electrical, ventilation and combustion appliances.

During testing:

1. Exterior windows and doors, fireplace and stove doors shall be closed, but not sealed;

2. Dampers shall be closed, but not sealed, including exhaust, intake, makeup air, backdraft and flue dampers;

3. Interior doors shall be open;

4. Exterior openings for continuous ventilation systems and heat recovery ventilators shall be closed and sealed;

5. Heating and cooling system(s) shall be turned off;

6. HVAC ducts shall not be sealed; and

7. Supply and return registers shall not be sealed.

402.4.2.2 Visual inspection option. Building envelope tightness and insulation installation shall be considered acceptable when the items listed in Table 402.4.2, applicable to the method of construction, are field verified. Where required by the code official, an approved party independent from the installer of the insulation shall inspect the air barrier and insulation. [No change to Table 402.4.2]

402.4.3 Fireplaces. New wood-burning fireplaces shall have gasketed doors and outdoor combustion air.

402.4.4 Fenestration air leakage. Windows, skylights and sliding glass doors shall have an air infiltration rate of no more than 0.3 cfm per square foot (1.5 L/s/m2), and swinging doors no more than 0.5 cfm per square foot (2.6 L/s/m2), when tested according to NFRC 400 or AAMA/WDMA /CSA 101/I.S.2/A440 by an accredited, independent laboratory and listed and labeled by the manufacturer.

Exceptions: Site-built windows, skylights and doors.

402.4.5 Recessed lighting. Recessed luminaires installed in the building thermal envelope shall be sealed to limit air leakage between conditioned and unconditioned spaces. All recessed luminaires shall be IC-rated and labeled as meeting ASTM E 283 when tested at 1.57 psf (75 Pa) pressure differential with no more than 2.0 cfm (0.944 L/s) of air movement from the conditioned space to the ceiling cavity.

All recessed luminaires shall be sealed with a gasket or caulk between the housing and the interior wall or ceiling covering.

402.5 Maximum fenestration U-factor and SHGC (Mandatory). The area-weighted average maximum fenestration U-factor permitted using trade-offs from Section 402.1.4 or 404 shall be 0.48 in Zones 4 and 5 and 0.40 in Zones 6 through 8 for vertical fenestration, and 0.75 in Zones 4 through 8 for skylights. The area-weighted average maximum fenestration SHGC permitted using trade-offs from Section 405 in Zones 1 and 2 through 3 shall be 0.50.

SECTION 403

SYSTEMS

403.1 Controls (Mandatory). At least one thermostat shall be provided for each separate heating and cooling system.

403.1.1 Programmable thermostat. Where the primary heating system is a forced-air furnace, at least one thermostat per dwelling unit capable of controlling the heating and cooling system on a daily schedule to maintain different temperature set points at different times of the day. This thermostat shall include the capability to set back or temporarily operate the system to maintain zone temperatures down to 55°F (13°C) or up to 85°F (29°C). The thermostat shall initially be programmed with a heating temperature set point no higher than 70°F (21°C) and a cooling temperature set point no lower than 78°F (26°C).

403.1.2 Heat pump supplementary heat (Mandatory). Heat pumps having supplementary electric-resistance heat shall have controls that, except during defrost, prevent supplemental heat operation when the heat pump compressor can meet the heating load.

403.1.3 Humidity control. Where a humidistat is used for comfort dehumidification, it shall be capable of being set to prevent the use of fossil fuel or electricity to reduce humidities below 60 percent.

403.2 Ducts.

403.2.1 Insulation (Prescriptive). Supply ducts, including air filter enclosures, air ducts and plenums, located in attics or on roofs shall be insulated to a minimum of R-8. All other ducts shall be insulated to a minimum of R-6.

Exceptions:

1. Ducts or portions thereof located completely inside the building thermal envelope.

2. Exhaust air ducts

3. Factory-installed plenums, casings or ductwork furnished as a part of tested and rated HVAC equipment.

403.2.2 Sealing (Mandatory). All ducts, air handlers, filter boxes and building cavities which form the primary air containment passageways for air distribution systems shall be considered ducts or plenum chambers, shall be constructed and sealed in accordance with used as ducts shall be sealed. Joints and seams shall comply with Section M1601.4.1 of the Florida Building Code, International Residential, Code. or Section 603 of the Florida Building Code, Mechanical, as applicable, and shall be shown to meet duct tightness criteria in Section 403.2.2.1.

403.2.2.1 Duct tightness. Duct tightness shall be verified by testing to either of the following

1. Post construction test: Leakage to outdoors shall be less than or equal to 8 cfm (226.5 L/min) per 100 ft² (9.29 m²) of conditioned floor area or a total leakage less than or equal to 12 cfm (12 L/min) per 100 ft² (9.29 m²) of conditioned floor area when tested at a pressure differential of 0.1 inches w.g. (25 Pa) across the entire system, including the manufacturer’s air handler enclosure. All register boots shall be taped or otherwise sealed during the test.

2. Rough-in test: Total leakage shall be less than or equal to 6 cfm (169.9 L/min) per 100 ft² (9.29 m²) of conditioned floor area when tested at a pressure differential of 0.1 inches w.g. (25 Pa) across the roughed-in system, including the manufacturer’s air handler enclosure. All register boots shall be taped or otherwise sealed during the test. If the air handler is not installed at the time of the test, total leakage shall be less than or equal to 4 cfm (113.3 L/min) per 100 ft² (9.29 m²) of conditioned floor area.

Exceptions: Duct tightness test is not required if the air handler and all ducts are located within conditioned space.

ASHRAE Standard 152. All ducts and air handlers shall be either located in conditioned space or tested by a Class 1 BERS rater to be “substantially leak free”. “Substantially leak free” shall mean distribution system air leakage to outdoors no greater than 3 cfm per 100 square feet of conditioned floor area at a pressure differential of 25 Pascal (0.10 in. w.c.) across the entire air distribution system, including the manufacturer’s air handler enclosure.

403.2.3 Building cavities. Building framing cavities shall not be used as supply ducts.

403.2.4 Air-handling units. Air handling units shall not be installed in the attic when a home is brought into code compliance by Section 402. Air-handling units shall be allowed in attics for compliance by Section 405 only if the following conditions are met:

1. The service panel of the equipment is located within 6 feet (1829 mm) of an attic access.

2. A device is installed to alert the owner or shut the unit down when the condensation drain is not working properly.

3. The attic access opening is of sufficient size to replace the air handler.

4. A notice is posted on the electric service panel indicating to the homeowner that the air handler is located in the attic. Said notice shall be in all capitals, in 16 point type, with the title and first paragraph in bold:

NOTICE TO HOMEOWNER

A PART OF YOUR AIR-CONDITIONING SYSTEM, THE AIR HANDLER, IS LOCATED IN THE ATTIC. FOR PROPER, EFFICIENT, AND ECONOMIC OPERATION OF THE AIR-CONDITIONING SYSTEM, YOU MUST ENSURE THAT REGULAR MAINTENANCE IS PERFORMED. YOUR AIR-CONDITIONING SYSTEM IS EQUIPPED WITH ONE OR BOTH OF THE FOLLOWING: (1) A DEVICE THAT WILL ALERT YOU WHEN THE CONDENSATION DRAIN IS NOT WORKING PROPERLY OR (2) A DEVICE THAT WILL SHUT THE SYSTEM DOWN WHEN THE CONDENSATION DRAIN IS NOT WORKING. TO LIMIT POTENTIAL DAMAGE TO YOUR HOME, AND TO AVOID DISRUPTION OF SERVICE, IT IS RECOMMENDED THAT YOU ENSURE PROPER WORKING ORDER OF THESE DEVICES BEFORE EACH SEASON OF PEAK OPERATION.

403.3 Mechanical system piping insulation (Mandatory). Mechanical system piping capable of carrying fluids above 105°F (41°C) or below55°F (13°C) shall be insulated to a minimum of R-3.

403.4 Hot water systems (Mandatory. 553.909, F.S.)

403.4.1 Circulating hot water systems, insulation (Mandatory). All circulating service hot water piping shall be insulated to at least R-2. Circulating hot water systems shall include an automatic or readily accessible manual switch that can turn off the hot water circulating pump when the system is not in use. Pipe insulation buried underground shall be as specified by the manufacturer for underground use.

403.4.2 Heat traps. Storage water heaters not equipped with integral heat traps and having vertical pipe risers shall have heat traps installed on both the inlets and outlets. External heat traps shall consist of either a commercially available heat trap or a downward and upward bend of at least 3½ inches (89 mm) in the hot water distribution line and cold water line located as close as possible to the storage tank.

403.4.3 Water heater efficiencies.

403.4.3.1 Storage water heater temperature controls.

403.4.3.1.1 Automatic controls. Service water heating systems shall be equipped with automatic temperature controls capable of adjustment from the lowest to the highest acceptable temperature settings for the intended use. The minimum temperature setting range shall be from 100°F to 140°F (38°C to 60°C).

403.4.3.1.2 Shut down. A separate switch or a clearly marked circuit breaker shall be provided to permit the power supplied to electric service systems to be turned off. A separate valve shall be provided to permit the energy supplied to the main burner(s) of combustion types of service water heating systems to be turned off.

403.4.3.2 Water heater efficiencies. Residential sized water heaters shall meet the minimum efficiencies of this section. Water heating systems not covered in this section shall meet the minimum efficiencies listed for that system in Section 504 of this code.

403.4.3.2.1 Electric water heaters. All automatic electric storage water heaters having a storage capacity of 120 gallons (454 L) or less and an input rating of 12 kw or less shall, when tested in accordance with the DOE Uniform Test Method for Measuring the Energy Consumption of Water Heaters, Appendix E to Subpart B, 10 CFR Part 430, meet the performance minimums listed in Table 403.4.2.2.

403.4.3.2.2 Gas- and oil-fired water heater efficiencies. All gas- and oil-fired automatic storage water heaters with capacities of 100 gallons or less and an input rating of 75,000 Btu/h or less (gas) or 105,000 Btu/h or less (oil) shall, when tested in accordance with the DOE Uniform Test Method for Measuring the Energy Consumption of Water Heaters, Appendix E to Subpart B, 10 CFR Part 430, meet the performance minimums listed in Table 403.4.2.2.

403.4.3.2.2.1 Gas Instantaneous or Tankless Water Heaters. All gas-fired instantaneous (tankless) water heaters that a) initiate heating based on sensing water flow, b) are designed to deliver water at a controlled temperature of less than 180 °F (82 °C), c) have an input less than 200,000 Btu/h (210 MJ/h), d) have a manufacturer's specified storage capacity of less than 2 gallons (7.6 liters) and, e) have either a fixed or variable burner input shall, when tested in accordance with the DOE Uniform Test Method for Measuring the Energy Consumption of Water Heaters, Appendix E to Subpart B, Title 10 CFR 430, meet the performance minimums established in Title 10 CFR 430.32, Energy and Water Conservation Standards and Effective Dates.

403.4.3.2.2.2 Combination service water heating and space heating equipment. Service water heating equipment used to provide additional functions (e.g. space heating) as part of a combination (integrated) system shall comply with minimum performance requirements for water heating equipment. For combined gas storage tank water heating and space heating systems tested to ANSI/ASHRAE 124, the EF used shall be the effective water heating efficiency (CA _ef) listed for the appliance by the Gas Appliance Manufacturer’s Association (GAMA). For combined gas instantaneous (tankless) water heating and space heating systems, the EF used shall be determined in accordance with the DOE Uniform Test Method for Measuring the Energy Consumption of Water Heaters, Appendix E to Subpart B, Title 10 CFR 430.

Combination systems utilizing a storage tank water heater as the heat source for space heating purposes with input ratings of 105,000 Btu/h (360m³/kW) or less shall utilize a water heater listed by the Gas Appliance Manufacturer’s Association (GAMA). Changeouts of burners or heating elements to increase capacity shall not be made unless the unit has been listed at that capacity by GAMA.

403.4.3.2.3 Solar water heating systems. Solar systems for domestic hot water production are rated by the annual solar energy factor of the system. The solar energy factor of a system shall be determined from the Florida Solar Energy Center Directory of Certified Solar Systems. Solar collectors shall be tested in accordance with ISO Standard 9806, Test Methods for Solar Collectors, and SRCC Standard TM-1, Solar Domestic Hot Water System and Component Test Protocol. Collectors in installed solar water heating systems should meet the following criteria:

1. Be installed with a tilt angle between 10 degrees and 40 degrees of the horizontal; and

2. Be installed at an orientation within 45 degrees of true south.

TABLE 403.4.3.2

MINIMUM PERFORMANCE STANDARDS WATER HEATING EQUIPMENT:

FIRED STORAGE WATER HEATER MINIMUM ENERGY FACTORS (EF)

TYPE / VOLUME	TANK VOLUME (GALLONS)
	20	30	40	50	60	70	80	100	120
ELECTRIC: Up to 120 gallon or 12kW input	.94	.93	.92	.90	.88	—	.86	.84	.81
GAS: Up to 100 gallon or 75,000 Btu/h input	.63	.61	.59	.58	.55	.53	—	.48	—
OIL: Up to 50 gallon or 75,000 Btu/h input	—	.53	.51	.50	—	—	—	—	—

403.5 Mechanical ventilation (Mandatory). Outdoor air intakes and exhausts shall have automatic or gravity dampers that close when the ventilation system is not operating.

403.5.1 Ventilation air. Residential buildings designed to be operated at a positive indoor pressure or for mechanical ventilation shall meet the following criteria:

1. The design air change per hour minimums for residential buildings in ASHRAE 62, Ventilation for Acceptable Indoor Air Quality, shall be the maximum rates allowed for residential applications.

2. No ventilation or air-conditioning system make-up air shall be provided to conditioned space from attics, crawlspaces, attached enclosed garages or outdoor spaces adjacent to swimming pools or spas.

3. If ventilation air is drawn from enclosed space(s), then the walls of the space(s) from which air is drawn shall be insulated to a minimum of R-11 and the ceiling shall be insulated to a minimum of R-19, space permitting, or R-10 otherwise.

403.6 Heating and Cooling Equipment sizing (Mandatory. 553.912, F.S.).

403.6.1 Equipment sizing. Heating and cooling equipment shall be sized based on building loads calculated in accordance with ACCA Manual J or other approved heating and cooling calculation methodologies. in accordance with Section M1401.3 of the International Residential Code. The manufacturer and model number of the outdoor and indoor units (if split system) shall be submitted along with the sensible and total cooling capacities at the design conditions described in Section 302.1.

403.6.1.1 Cooling equipment capacity. Cooling only equipment shall be selected so that its total capacity is not less than the calculated total load but not more than 1.15 times greater than the total load calculated according to the procedure selected in Section 403.6, or the closest available size provided by the manufacturer's product lines. The corresponding latent capacity of the equipment shall not be less than the calculated latent load.

Exceptions:

1. Attached single- and multiple-family residential equipment sizing may be selected so that its cooling capacity is less than the calculated total sensible load but not less than 80 percent of that load.

2. When signed and sealed by a Florida-registered engineer, in attached single- and multiple-family units, the capacity of equipment may be sized in accordance with good design practice.

403.6.1.2 Heating equipment capacity.

403.6.1.2.1 Heat Pumps. Heat pump sizing shall be based on the cooling requirements as calculated according to Section 403.6.1.1 and the heat pump total cooling capacity shall not be more than 1.15 times greater than the design cooling load even if the design heating load is 1.15 times greater than the design cooling load.

403.6.1.2.2 Electric resistance furnaces. Electric resistance furnaces shall be sized within 4 kW of the design requirements calculated according to the procedure selected in Section 403.6.1.

403.6.1.2.3 Fossil fuel heating equipment. The capacity of fossil fuel heating equipment with natural draft atmospheric burners shall not be less than the design load calculated in accordance with Section 403.6.1.

403.6.1.3 Extra capacity required for special occasions. Residences requiring excess cooling or heating equipment capacity on an intermittent basis, such as anticipated additional loads caused by major entertainment events, shall have equipment sized or controlled to prevent continuous space cooling or heating within that space by one or more of the following options:

1. A separate cooling or heating system is utilized to provide cooling or heating to the major entertainment areas.

2. A variable capacity system sized for optimum performance during base load periods is utilized.

403.6.2 Equipment performance standards.

403.6.2.1 Equipment ratings. Equipment efficiency ratings shall be obtained from a nationally recognized certification program directory, or from a manufacturer’s rating certified to be in compliance with an approved Department of Energy (DOE) or Air-conditioning, Heating and Refrigeration Institute (AHRI) rating procedure. Equipment efficiencies shall be based on the standard rating conditions contained in the test standard referenced in Chapter 6 that is appropriate for that equipment. Minimum ratings for products covered under the National Appliance Energy Conservation Act of 1987 shall be those determined for Region IV and used for the Federal Trade Commission’s required appliance labeling.

403.6.2.1.1 Equipment efficiency verification. Equipment covered under the Federal Energy Policy Act of 1992 (EPACT) shall comply with U.S. Department of Energy certification requirements. For other equipment, if a certification program exists for a product covered in Table 403.6.2.2 and 403.6.2.3, and it includes provisions for verification and challenge of equipment efficiency ratings, then the product shall be either listed in the certification program or, alternatively, the ratings shall be verified by an independent laboratory test report. If no certification program exists for a product covered in Tables 403.6.2.2 and 403.6.2.3, the equipment efficiency ratings shall be supported by data furnished by the manufacturer. Where components such as indoor or outdoor coils from different manufacturers are used, a Florida-registered engineer shall specify component efficiencies whose combined efficiency meets the minimum equipment efficiency requirements.

403.6.2.2 Minimum efficiencies for cooling equipment. Residential sized cooling and heating equipment shall meet the minimum efficiencies of Table 403.6.2.2(1) through 403.6.2.2 (3) of this section. Cooling systems not covered in this section shall meet the minimum efficiencies listed for that type of system in Section 503 of this code. Equipment used to provide water heating functions as part of a combination system shall satisfy all stated requirements for the appropriate space heating or cooling category.

Exception: Existing mechanical systems undergoing alteration need not meet the minimum equipment efficiencies of this section except to preserve the original approval or listing of the equipment.

TABLE 403.6.2.2(1)

ELECTRICALLY OPERATED UNITARY AIR CONDITIONERS AND CONDENSING UNITS

Equipment Type	Size Category	Heating Section Type	Sub-Category or Rating Condition	Minimum Efficiency^2	Test Procedure^1
Air Conditioners, Air Cooled	<65,000 Btu/h^3	All	Split System	13.0 SEER	ARI 210/240
			Single Package	13.0 SEER
	≥65,000 Btu/h and <135,000 Btu/h	Electric Resistance (or None)	Split System and Single Package	10.3 EER	ARI 340/360
		All other	Split System and Single Package	10.1 EER
Through-the Wall, Air-cooled	<30,000 Btu/h^3	All	Split System	10.9 SEER	ARI 210/240
			Single Package	10.6 SEER
Small-Duct High-Velocity, Air cooled	<65,000 Btu/h^3	All	Split system or Single Package	11.0 SEER	ARI 210/240
Space constrained products, air conditioners	<65,000 Btu/h^3	All	Split system or Single Package	12.0 SEER^4	ARI 210/240
Air Conditioners, Water and Evaporatively Cooled	<65,000 Btu/h	All	Split System and Single Package	12.1 EER	ARI 210/240
	≥65,000 Btu/h and <135,000 Btu/h	Electric Resistance (or None)	Split System and Single Package	11.5 EER	ARI 340/360
		All other	Split System and Single Package	11.3 EER

¹ Chapter 6 contains a complete specification of the reference test procedure, including the referenced year version of the test procedure.

² IPLVs and part load rating conditions are only applicable to equipment with capacity modulation.

³ Single-phase, air-cooled air-conditioners <65,000 Btu/h are regulated by NAECA. SEER values are those set by NAECA.

⁴As granted by U.S. Department of Energy letter of exception, specific to individual companies, SDHV products without a letter of exception

shall have the same efficiency as air-cooled air-conditioners.

TABLE 403.6.2.2(2)

ELECTRICALLY OPERATED UNITARY AND APPLIED HEAT PUMPS

– MINIMUM EFFICIENCY REQUIREMENTS

Equipment Type	Size Category	Heating Section Type	Sub-Category or Rating Condition	Minimum Efficiency^2	Test Procedure^1
Air Cooled (Cooling Mode)	<65,000 Btu/h^3	All	Split System	13.0 SEER	ARI 210/240
			Single Package	13.0 SEER
	≥65,000 Btu/h and <135,000 Btu/h	Electric Resistance (or None)	Split System and Single Package	10.1 EER
		All other	Split System and Single Package	9.9 EER
Through-the Wall, Air-cooled	≤30,000 Btu/h^3	All	Split System	10.9 SEER	ARI 210/240
			Single Package	10.6 SEER
Small-Duct High-Velocity, Air cooled	<65,000 Btu/h^3	All	Split system	11.0 SEER	ARI 210/240
Water Source (Cooling Mode)	<17,000 Btu/h	All	86^oF Entering Water	11.2 EER	ISO-13256-1
	≥17,000 Btu/h and <135,000 Btu/h	All	86^oF Entering Water	12.0 EER
Groundwater Source (Cooling Mode)	<135,000 Btu/h	All	59^oF Entering Water	16.2 EER
Ground Source (Cooling Mode)	<135,000 Btu/h	All	77^oF Entering Water	13.4 EER
Air Cooled (Heating Mode)	<65,000 Btu/h^3 (Cooling Capacity)		Split System	7.7 HSPF	ARI 210/240
			Single Package	7.7 HSPF
	≥65,000 Btu/h and <135,000 Btu/h (Cooling Capacity)		47^oF db/43^oF wb Outdoor Air	3.2 COP	ARI 340/360
			17^oF db/15^oF wb Outdoor Air	2.2 COP
Through-the Wall, Air-cooled, heating mode)	≤30,000 Btu/h^3 (Cooling Capacity)		Split System	7.1 HSPF	ARI 210/240
			Single Package	7.0 HSPF
Small-Duct High-Velocity, Air cooled, heating mode	<65,000 Btu/h^3 (Cooling Capacity)		Split System or Single Package	6.8 HSPF^4	ARI 210/240
Space constrained products, heap pumps	<65,000 Btu/h^3		Split System or Single Package	7.4 HSPF	ARI 210/240
Water-Source (Heating Mode)	<135,000 Btu/h (Cooling Capacity)		68^oF Entering Water	4.2 COP	I ISO-13256-1
Groundwater Source (Heating Mode)	<135,000 Btu/h (Cooling Capacity)		50^oF Entering Water	3.6 COP
Ground Source (Heating Mode)	<135,000 Btu/h (Cooling Capacity)		32^oF Entering Water	3.1 COP

¹ Chapter 6 contains a complete specification of the reference test procedure, including the referenced year version of the test procedure.

² IPLVs and Part Load rating conditions are only applicable to equipment with capacity modulation.

³ Single-phase, air-cooled heat pumps <65,000 Btu/h are regulated by NAECA. SEER and HSPF values are those set by NAECA.

⁴As granted by U.S. Department of Energy letter of exception, specific to individual companies, SDHV products without a letter of exception

shall have the same efficiency as air-cooled air-conditioners.

TABLE 403.6.2.2(3)

ELECTRICALLY OPERATED PACKAGED TERMINAL AIR CONDITIONERS, PACKAGED TERMINAL HEAT PUMPS, SINGLE-PACKAGE VERTICAL AIR CONDITIONERS, SINGLE-PACKAGE VERTICAL HEAT PUMPS, ROOM AIR CONDITIONERS, AND ROOM AIR CONDITIONERS HEAT PUMPS — MINIMUM EFFICIENCY REQUIREMENTS

Equipment Type	Size Category	Subcategory or Rating Condition	Minimum Efficiency^1	Test Procedure^2
	>15,000 Btu/h		2.51 COP
Room Air Conditioners with Louvered Sides	<8,000 <Btu/h		9.7 EER	ANSI/ AHAM RAC-1
	>8,000<14,000Btu/h		9.8 EER
	>14,000<20,000Btu/h		9.7 EER
	>20,000 Btu/h		8.5 EER
Room Air Conditioners, without Louvered Sides	<8,000 Btu/h		9.0 EER
	>8,000 Btu/h		8.5 EER
Room Air Conditioner Heat Pumps with Louvered Sides	<20,000 Btu/h ≥20,000 Btu/h		9.0 EER 8.5 EER
Room Air Conditioner Heat Pumps without Louvered Sides	<14,000 Btu/h		8.5 EER
	≥14,000 Btu/h		8.0 EER
Room Air Conditioner, Casement only	All Capacities		8.7 EER
Room Air Conditioner, Casement-Slider	All Capacities		9.5 EER

¹ Chapter 6 contains a complete specification of the referenced test procedure, including the referenced year version of the test procedure.

² Replacement units must be factory labeled as follows: “MANUFACTURED FOR REPLACEMENT APPLICATIONS ONLY; NOT TO BE

INSTALLED IN NEW CONSTRUCTION PROJECTS.” Replacement efficiencies apply only to units with existing sleeves less than 16 in. high and less than 42 in. wide.

³ Cap means the rated cooling capacity of the product in Btu/h. If the unit’s capacity is less than 7,000 Btu/h, use 7,000 Btu/h in the calculation.

If the unit’s capacity is greater than 15,000 Btu/h, use 15,000 Btu/h in the calculation.

403.6.2.3 Minimum efficiencies for heating equipment. Residential sized heating equipment shall meet the minimum efficiencies of Table 403.6.2.3(1) through 403.6.2.3(2) of this section. Heating systems not covered in this section shall meet the minimum efficiencies listed for that type of system in Section 503 of this code.

Exception: Existing mechanical systems undergoing alteration need not meet the minimum equipment Efficiencies of this section except to preserve the original approval or listing of the equipment

403.6.2.3.1 Gas and oil-fired furnaces. Gas-fired and oil-fired forced air furnaces with input ratings >225,000 Btu/h shall also have an intermittent ignition or interrupted device (IID) and have either power venting or a flue damper. A vent damper is an acceptable alternative to a flue damper for furnaces where combustion air is drawn from the conditioned space. All furnaces with input ratings >225,000 Btu/h, including electric furnaces, that are not located within the conditioned space shall have jacket losses not exceeding 0.75 percent of the input.

403.6.2.3.2 Central electric furnaces. Central electric furnaces greater than 10 kW shall be divided into at least two stages and controlled by an outdoor thermostat, multistage indoor thermostat, or combinations thereof.

TABLE 403.6.2.3(1)

WARM AIR FURNACES AND COMBINATION WARM AIR FURNACES/AIR-CONDITIONING UNITS, WARM AIR DUCT FURNACES

AND UNIT HEATERS MINIMUM EFFICIENCY REQUIREMENTS

Equipment Type	Size Category	Subcategory or Rating Condition	Minimum Efficiency^1	Test Procedure^2
Warm Air Furnace, Gas-Fired	<225,000 Btu/h	Maximum Capacity^4	78% AFUE or 80% Et^4	DOE 10 CFR, Part 430 or ANSI Z 21.47
	≥225,000 Btu/h		80% Ec^3	ANSI Z21.47
Warm Air Furnace, Oil-Fired	<225,000 Btu/h	Maximum Capacity^4	78% AFUE or ;80% Et^5	DOE 10 CFR, Part 430 or UL 727
	≥225,000 Btu/h		81% Et^6	UL 727
Warm Air Duct Furnaces, Gas-Fired	All Capacities	Maximum Capacity^5	80% Ec^7	ANSI Z83.8
Warm Air Unit Heaters, Gas-Fired	All Capacities	Maximum Capacity^5	80% Ec^7	ANSI Z83.8
Warm Air Unit Heaters, Oil-Fired	All Capacities	Maximum Capacity^5	80% Ec^7	UL 731

¹ E_t = thermal efficiency. See test procedure for detailed discussion.

² Chapter 6 contains a complete specification of the referenced test procedure, including the referenced year version of the test procedure.

³ E_c = combustion efficiency. Units must also include an IID, have jacket losses not exceeding 0.75% of the input rating, and have either power venting or a flue damper. A vent damper is an acceptable alternative to a flue damper for those furnaces where combustion air is drawn from the conditioned space.

⁴ Combination units not covered by NAECA (3 phase power or cooling capacity greater than or equal to 65,000 Btu/h) may comply with either rating.

⁵ Minimum and maximum ratings as provided for and allowed by the unit’s controls.

⁶ E_t = thermal efficiency. Units must also include an IID, have jacket losses not exceeding 0.75% of the input rating, and have either power venting or a flue damper. A vent damper is an acceptable alternative to a flue damper for those furnaces where combustion air is drawn from the conditioned space.

⁷ E_c = combustion efficiency (100% less flue losses). See test procedure for detailed discussion.

TABLE 403.6.2.3(2)

Gas- and Oil-Fired Boilers

Minimum Efficiency Requirements

Equipment Type^4	Size Category (Input)	Subcategory or Rating Condition	Minimum Efficiency^1	Test Procedure^2
Boilers, Gas-Fired	<300,000 Btu/h	Hot water	80% AFUE	DOE 10 CFR Part 430
		Steam	75% AFUE
Boilers, Oil-Fired	<300,000 Btu/h		80% AFUE	DOE 10 CFR Part 430

¹ Et = thermal efficiency. See reference documents for detailed information.

² Chapter 6 contains a complete specification of the referenced test procedure, including the referenced year version of the test procedure.

³ Minimum and maximum ratings as provided for and allowed by the unit’s controls.

⁴ These requirements apply to boilers with rated input of 8,000,000 Btu/h or less that are not packaged boilers, and to all package boilers. Minimum efficiency requirements for boilers cover all capacities of packaged boilers.

403.7 Systems serving multiple dwelling units (Mandatory). Systems serving multiple dwelling units and equipment not covered by Section 403.6.2 shall comply with Sections 503 and 504 in lieu of Section 403.

403.8 Snow melt system controls (Mandatory). Reserved. Snow- and ice-melting systems, supplied through energy service to the building, shall include automatic controls capable of shutting off the system when the pavement temperature is above 50°F, and no precipitation is falling and an automatic or manual control that will allow shutoff when the outdoor temperature is above 40°F.

403.9 Pools (Mandatory). Pools shall be provided with energy-conserving measures in accordance with Sections 403.9.1 through 403.9.3.

403.9.1 Pool and spa heaters. All pool heaters shall be equipped with a readily accessible on-off switch to allow shutting off the heater without adjusting the thermostat setting.

403.9.1.1 Gas and oil-fired pool and spa heaters. All gas- and oil-fired pool and spa heaters shall have a minimum thermal efficiency of 78 percent when tested in accordance with ANSI Z 21.56. Pool heaters fired by natural gas shall not have continuously burning pilot lights.
403.9.1.2 Heat pump pool heaters. Heat pump pool heaters shall have a minimum COP of 4.0 when tested in accordance with ARI 1160, Table 2, Standard Rating Conditions-Low Air Temperature. A test report from an independent laboratories is required to verify procedure compliance.

403.9.2 Time switches. Time switches shall be installed on swimming pool heaters and pumps that can automatically turn off and on the heaters and pumps off and on according to a preset schedule shall be installed on swimming pool heaters and pumps.

Exceptions:

1. Where public health standards require 24-hour pump operation.

2. Where pumps are required to operate solar- and waste-heat-recovery pool heating systems.

403.9.3 Pool covers. Heated swimming pools and spas shall be equipped with a vapor-retardant pool cover on or at the water surface. Pools heated to more than 90°F (32°C) shall have a pool cover with a minimum insulation value of R-12.

Exception: Outdoor pPools deriving over 70 60 percent of the energy for heating from site-recovered energy or solar energy source computed over an operating season.

SECTION 404

ELECTRICAL POWER AND LIGHTING SYSTEMS

404.1 Lighting equipment (Prescriptive). A minimum of 50 percent of the lamps in permanently installed lighting fixtures shall be high-efficacy lamps.

SECTION 405

SIMULATED PERFORMANCE ALTERNATIVE (Performance)

405.1 Scope. This section establishes criteria for compliance using simulated energy performance analysis. Such analysis shall include heating, cooling, and service water heating energy only.

405.2 Mandatory requirements. Compliance with this section requires that the mandatory provisions identified in Section 401.2 be met. All supply and return ducts not completely inside the building thermal envelope shall be insulated to a minimum of R-6.

405.3 Performance-based compliance. Compliance based on simulated energy performance requires that a proposed residence (proposed design) be shown to have an annual normalized, modified energy load that is less than or equal to the annual energy load of the standard reference design. code official, such as the Department of Energy, Energy Information Administration’s State Energy Price and Expenditure Report. Code officials shall be permitted to require time-of-use pricing in energy cost calculations.

405.4 Documentation.

405.4.1 Compliance software tools. Documentation verifying that the methods and accuracy of tThe Energy Gauge USA Fla/Res compliance software tools shall be utilized to conform to the provisions of this section. shall be provided to the code official.

405.4.2 Compliance report. The cCompliance software tools shall generate a Form 405 report that documents that the proposed design complies with Section 405.3. The compliance documentation shall be submitted to the building official before a building permit is issued and shall include the following information:

1. Address or other identification of the residence;

2. An inspection checklist documenting the building component characteristics of the proposed design as listed in Table 405.5.2(1). The inspection checklist shall show results for both the standard reference design and the proposed design, and shall document all inputs entered by the user necessary to reproduce the results;

3. Name of individual completing the compliance report; and

4. Name and version of the compliance software tool.

Exception: Worst case calculations for mMultiple orientations. When an otherwise identical building model is offered in multiple orientations or with improved component or equipment alternatives, compliance for any orientation shall be permitted by documenting that the building meets the performance requirements for the worst case component or equipment alternative(s) and in each of the four cardinal (north, east, south and west) orientations.

405.4.3 Additional documentation. The code official shall be permitted to require the following documents:

1. Documentation of the building component characteristics of the standard reference design.

2. An EPL Display Card certification signed by the builder providing the building component characteristics of the proposed design (as given in Table 405.5.2(1)) to be provided to the purchaser of the home at time of title transfer.

3. Documentation of the component efficiencies actual values used in the software calculations for the proposed design.

405.5 Calculation procedure.

405.5.1 General. Except as specified by this section, the Standard Reference Design and Proposed Design shall be configured and analyzed using identical methods and techniques. The Standard Reference Design totals for the Simulated Performance Alternative compliance method developed in accordance with the criteria in Sections 405.5.2 and 405.3 shall be adjusted by a factor of 0.80 to make the code 20 percent more stringent than the “2007” Florida energy code’s Standard Reference Design (Baseline) features.

405.5.2 Residence specifications. The Standard Reference Design and Proposed Design shall be configured and analyzed as specified by Table 405.5.2(1). Table 405.5.2(1) shall include by reference all notes contained in Table 402.1.1.

405.5.3 Envelope calculation requirements.

405.5.3.1 Glass areas. All glazing areas of a residence, including windows, sliding glass doors, glass in doors, skylights, etc. shall include the manufacturer’s frame area in the total window area. Window measurements shall be as specified on the plans and specifications for the residence.

Exception: When a window in existing exterior walls is enclosed by an addition, an amount equal to the area of this window may be subtracted from the glazing area for the addition for that overhang and orientation.

405.5.3.2 Overhangs. Overhang effect is measured by Overhang Separation, which is the vertical measure of the distance from the top of a window to the bottom of the overhang. The overhang for adjustable exterior shading devices shall be determined at its most extended position. Nonpermanent shading devices such as canvas awnings shall not be considered overhangs. Permanently attached wood and metal awnings may be considered overhangs.

405.5.3.3 Doors with glazing. For doors that are opaque or where the glass is less than one-third of the area of the door, the total door area shall be included in the door calculation. For unlabeled sliding glass doors or when glass areas in doors is greater than or equal to one-third of the area of the door, the glazing portion shall be included in the glazing calculation and the opaque portion of the door shall be included in the door calculation. When glass area in doors is greater than or equal to one-third of the area of the door, the door shall be included in the glazing calculation as a total fenestration using the tested U-factor and solar heat gain coefficient.

405.5.4. Equipment calculation of End Use Energy Loads for Code Compliance Determination.

405.5.4.1 The energy loads for heating, cooling and hot water in the Proposed Design home shall be normalized to account for the differences in improvement potential that exist across equipment types using the following formula in accordance with the paper "The HERS Rating Method and the Derivation of the Normalized Modified Loads Method," Research Report No. FSEC-RR-54-00, Florida Solar Energy Center.

nMEUL = REUL * (nEC_x /EC_r)

where:

nMEUL = normalized Modified End Use Loads (for heating, cooling or hot water) as computed using EnergyGauge USA. REUL = Standard Reference Design Home End Use Loads (for heating, cooling or hot water) as computed using EnergyGauge USA Fla/Res.

EC_r = estimated Energy Consumption for the Standard Reference Design Home’s end uses (for heating, including auxiliary electric consumption, cooling or hot water) as computed using EnergyGauge USA Fla/Res.

and where: nEC_x = (a* EEC_x – b)*(EC_x * EC_r * DSE_r) / ( EEC_x * REUL)

where:

nEC_x = normalized Energy Consumption for Proposed Design’s end uses (for heating, including auxiliary electric consumption, cooling or hot water) as computed using EnergyGauge USA Fla/Res.

EC_r = estimated Energy Consumption for Standard Reference Design home’s end uses (for heating, including auxiliary electric consumption, cooling or hot water) as computed using EnergyGauge USA Fla/Res.

EC_x = estimated Energy Consumption for the Proposed Design home’s end uses (for heating, including auxiliary electric consumption, cooling or hot water) as computed using EnergyGauge USA Fla/Res.

EEC_x = Equipment Efficiency Coefficient for the Standard Reference Design home’s equipment, such that

EEC_x equals the energy consumption per unit load in like units as the load, and as derived from the Manufacturer’s Equipment Performance Rating (MEPR) such that

EEC_x equals 1.0 / MEPR for AFUE, COP or EF ratings, or such that EEC_x equals 3.413 / MEPR for HSPF, EER or SEER ratings.

DSE_r = REUL/EC_r * EEC_r

For simplified system performance methods, DSE_r equals 0.80 for heating and cooling systems. However, for detailed modeling of heating and cooling systems, DSE_r may be less than 0.80 as a result of part load performance degradation, coil air flow degradation, improper system charge and auxiliary resistance heating for heat pumps. Except as otherwise provided by these Standards, where detailed systems modeling is employed, it must be applied equally to both the Standard Reference Design and the Proposed Design homes.

EEC_r = Equipment Efficiency Coefficient for the Standard Reference Design home’s equipment, such that EEC_r equals the energy consumption per unit load in like units as the load, and as derived from the Manufacturer’s Equipment Performance Rating (MEPR) such that EEC_r equals 1.0 / MEPR for AFUE, COP or EF ratings, or such that EEC_r equals 3.413 / MEPR for HSPF, EER or SEER ratings.

REUL = Standard Reference Design home End Use Loads (for heating or cooling) as
computed using EnergyGauge USA Fla/Res.

and where the coefficients ‘a’ and ‘b’ are as defined by Table 405.5.2(3).

405.5.4.2 Following normalization of the heating, cooling and hot water energy consumptions for the Proposed Design home as specified in Section 405.5.3 above, the Standard Reference Design home’s total reference end use loads for heating, cooling and hot water (REULtot) shall be compared with the Proposed Design home’s total normalized modified end use loads for heating, cooling and hot water (nMEULtot). If the total normalized modified loads of the Proposed Design home (nMEULtot) are equal to or less than the total reference loads of the Standard Reference Design home (REULtot), the Proposed Design complies with this code.

405.5.5 Requirements specific to credit options. Credit may be claimed in the software compliance calculation for technologies that meet prescriptive criteria specified below for various options.

405.5.5.1 Installation criteria for homes claiming the radiant barrier option. The sheet radiant barrier or IRCC options may be claimed where the radiant barrier system is to be installed in one of the configurations depicted in Figure 405.5.4.1 and the following conditions are met:

1. It shall be fabricated over a ceiling insulated to a minimum of R-19 with conventional insulation and shall not be used as a means to achieve partial or whole compliance with a minimum attic insulation level of R-19. Either a sheet type or spray applied interior radiation control coating (IRCC) may be used.

2. If the radiant barrier material has only one surface with high reflectivity or low emissivity it shall be facing downward toward the ceiling insulation.

3. The attic airspace shall be vented in accordance with Section R806 of the Florida Building Code, Residential.

4. The radiant barrier system shall conform to ASTM C 1313, Standard Specification for Sheet Radiant Barriers for Building Construction Applications, or ASTM C 1321, Standard Practice for Installation and Use of Interior Radiation Control Coating Systems (IRCCS) in Building Construction as appropriate for the type of radiant barrier to be installed. The operative surface shall have an emissivity not greater than 0.06 for sheet radiant barriers or 0.25 for interior radiation control coatings as demonstrated by independent laboratory testing according to ASTM C 1371.

5. The radiant barrier system (RBS) shall conform with ASTM C 1158, Use and Installation of Radiant Barrier Systems (RBS) in Building Constructions for Sheet Radiant Barriers, or ASTM C 1321, Standard Practice for Installation and Use of Interior Radiation Control Coating Systems (IRCCS) in Building Construction for IRCC systems.

6. The radiant barrier shall be installed so as to cover gable ends without closing off any soffit, gable or roof ventilation.

FIGURE 405.5.5.1

ACCEPTABLE ATTIC RADIANT BARRIER CONFIGURATIONS

[No change to figure]

405.5.5.2 Installation criteria for homes claiming the cool roof option. The cool roof option may be claimed where the roof to be installed has a tested solar reflectance of greater than 4 percent when evaluated in accordance with ASTM methods E-903, C-1549, E-1918 or CRRC Method #1. Emittance values provided by the roofing manufacturer in accordance with ASTM C 1371 shall be used when available. In cases where the appropriate data are not known, emittance shall be the same as the Standard Reference Design. Testing of a qualifying sample of the roofing material shall be performed by an approved independent laboratory with these results provided by the manufacturer.

405.5.5.3 Installation criteria for homes using the unvented attic assembly option. The unvented attic assembly option may be used if the criteria in Section R806.4 of the Florida Building Code, Residential, have been met.

405.5.5.4 Installation criteria for homes using the cross ventilation option. The cross ventilation option may be used if the following criteria have been met.

1. Operable aperture areas totaling a minimum of 12 percent of the floor area of the room shall be provided for all primary living areas and main bedrooms.

2. Insect screens shall be provided for all windows and doors to be considered operable aperture area. All screened entry doors and interior doors in the ventilated areas shall be provided with either (1) mechanically attached door stops (or similar devices) to hold the door in an open position or (2) operable louvers.

3. The total aperture area shall be provided by a minimum of two distinct windows. Each window shall provide not more than 70 percent of the total aperture area. The windows (or sliding glass doors) shall be placed in adjacent or opposite walls. The windows may be placed on a single outside wall if wing walls are used.

4. Where wing walls are included in the building design for ventilation purposes, they shall be placed between windows to create a high-pressure and a low-pressure zone on each window. Wing walls shall extend from the ground to eve height, be located on the windward side of the building, and extend outward from the building a distance at least equal to one-half the width of the window. NOTE: This technique is effective only for areas which experience significant and continuous winds during the cooling months.

405.5.5.5 Installation criteria for homes using the whole house fan option. The whole house fan option may be used if the following criteria have been met.

1. The whole house fan has been sized to provide a minimum of 20 air changes per hour for the entire house.

2. The fan installed shall have a free air cfm rating of at least three times the square footage of the conditioned area of the house.

3. To ensure adequate air exhaust, the house attic shall have gable, ridge or wind turbine vents whose total opening area is equal to four times the ceiling cutout area for the whole house fan. Soffit vents shall not be included in the exhaust vent area.

405.6 Calculation software tools.

405.6.1 Minimum capabilities. Calculation procedures used to comply with this section shall be software tools capable of calculating the annual energy consumption of all building elements that differ between the standard reference design and the proposed design and shall include the following capabilities:

1. Computer generation of the standard reference design using only the input for the proposed design. The calculation procedure shall not allow the user to directly modify the building component characteristics of the standard reference design.

2. Calculation of whole-building (as a single zone) sizing for the heating and cooling equipment in the standard reference design residence in accordance with Section 403.6 M1401.3 of the International Residential Code.

3. Calculations that account for the effects of indoor and outdoor temperatures and part-load ratios on the performance of heating, ventilating and air-conditioning equipment based on climate and equipment sizing.

4. Printed code official inspection checklist listing each of the proposed design component characteristics from Table 405.5.2(1) determined by the analysis to provide compliance, along with their respective performance ratings (e.g., R-value, U-factor, SHGC, HSPF, AFUE, SEER, EF, etc.)

405.6.2 Specific approval. The pPerformance analysis tools shall be approved by the Florida Building Commission meeting the applicable sections of Section 405 shall be permitted to be approved. Tools are permitted to be approved based on meeting a specified threshold for a jurisdiction. The code official shall be permitted to approve tools for a specified application or limited scope.

405.6.3 Input values. When calculations require input values not specified by Sections 402, 403, 404 and 405, those input values shall be taken from an approved source.

TABLE 405.5.2(1)

SPECIFICATIONS FOR THE STANDARD REFERENCE AND PROPOSED DESIGNS

Building Component	Standard Reference Design	Proposed Design
Above-grade walls:	Type: mass wall if proposed wall is mass; otherwise wWood frame Gross area: same as proposed U-Factor: 0.082 Solar absorptance = 0.75 Emittance = 0.90	As proposed As proposed As proposed As proposed As proposed
Conditioned basement and crawl space walls:	Type: same as proposed Gross area: same as proposed U-Factor: 0.36 with the insulation layer on the interior side of walls	As proposed As proposed As proposed
Above-grade Floors over unconditioned spaces:	Type: wood frame Gross area: same as proposed U-Factor: 0.064	As proposed As proposed As proposed
Ceilings:	Type: Wood frame Gross area: same as proposed U-Factor: 0.035	As proposed As proposed As proposed
Roofs:	Type: composition shingle on wood sheathing Gross area: same as proposed Solar absorptance = 0.75 Emittance = 0.90	As proposed As proposed As proposed, except that proposed solar absorptances less than 0.96 require test report in accordance with section ???? As proposed
Attics:	Type: vented with aperture = 1 ft^2 per 300 ft^2 ceiling area	As proposed
Foundations:	Type: same as proposed Foundation wall area above and below grade and soil characteristics: same as proposed Gross Area: same as proposed R-value: 0	As proposed As proposed As proposed
Crawlspaces:	Type: vented with net free vent aperture = 1 ft^2 per 150 ft^2 of crawlspace foor area.	Same as proposed, but not less net free ventilation area than the Standard Reference Design unless an approved ground cover in accordance with Section 408.1 of the Florida Building Code, Residential, is used, in which case, the same net free ventilation area as the Proposed Design home down to a minimum net free vent area of 1 ft^2 per 1,500 ft^2 of crawlspace floor area.
Doors:	Area: 40 ft^2 Orientation: North U-factor: 0.75	As proposed As proposed As proposed
Glazing: (a)	Total area (b) (a) The proposed glazing area; where proposed glazing area is less than 15% of the conditioned floor area. (b) 15% 18% of the conditioned floor area; where the proposed glazing area is 15% or more of the conditioned floor area. Orientation: equally distributed to four (4) cardinal compass orientations (N,E,S&W) U-factor: 0.75 SHGC:0.40 Interior shade coefficient except that for climates with no requirement (NR) SHGC = 0.40 shall be used Interior shade fraction Summer (all hours when cooling is required) = 0.70 Winter (all hours when heating is required) = 0.85 External shading: none	As proposed As proposed As proposed As proposed Same as standard reference design As proposed (c) As proposed As proposed
Skylights	None	As proposed
Thermally isolated sunrooms	None	As proposed
Air exchange rate	Specific Leakage Area (SLA) (d) = 0.00036 (assuming no energy recovery)	For residences that are not tested, the same as the Baseline Home. For residences with mechanical ventilation systems and with envelope leakage tested in accordance with ASHRAE Standard 119, Section 5.1, the measured air exchange rate (e) combined with the proposed mechanical ventilation rate (f) which where such mechanical ventilation rate shall not be less than 0.01 x CFA + 7.5 x (Nbr+1) Where: CFA = conditioned floor area Nbr = number of bedrooms
Mechanical ventilation:	None, except where a mechanical ventilation system is specified by the proposed design, in which case: Annual vent fan energy use: kWh/yr = 0.03942*CFA + 29.565 * (Nbr+1) (per dwelling unit) where: CFA = conditioned floor area Nbr = number of bedrooms	As proposed As proposed
Internal gains:	IGain = 17,900 + 23.8*CFA + 4104*Nbr (Btu/day per dwelling unit)	Same as reference design
Internal mass:	An internal mass for furniture and contents of 8 pounds per square foot of floor area	Same as reference design plus any additional mass specifically designed as a Thermal Storage Element (g,f) but not integral to the building envelope or structure
Structural mass:	For masonry floor slabs, 80% of floor area covered by R-2 carpet and pad, and 20% of floor directly exposed to room air. For masonry basement walls, as proposed, but with insulation required by Table 402.1.3 located on the interior side of the walls For other walls, for ceilings, floors, and interior walls, wood frame construction.	As proposed As proposed .
Heating systems (g,h)	As proposed Fuel type: same as Proposed Design efficiencies: Electric: air source heat pump with prevailing federal minimum efficiency Non-electric furnaces: natural gas furnace with prevailing federal minimum efficiency Non-electric boilers: natural gas boiler with prevailing federal minimum efficiency Capacity: sized in accordance with M1401.3 of the International Residential Code Section 403.6.1.	As proposed(i) As proposed As proposed As proposed As proposed
Cooling systems (h,k)	As proposed Fuel type: Electric Efficiency: in accordance with prevailing federal minimum standards Capacity: sized in accordance with Section 403.6.1 M1401.3 of the International Residential Code	As proposed (k) As proposed As proposed
Service water heating systems (g,I,j,k) (h) (m)	As proposed Fuel type:same as Proposed Design Efficiency: in accordance with prevailing federal minimum standards Use: same as proposed design (gal/day): 30*Ndu + 10*Nbr where Ndu = number of dwelling units Tank temperature: 120 F	As proposed(m) Gal/day=30 + (10 x Nbr) As proposed As proposed As proposed As proposed
Thermal distribution systems:	A thermal distribution system efficiency (DSE) of 0.80 0.88 shall be applied to both the heating and cooling system efficiencies for all systems other than tested duct systems. Duct insulation: From Section 403.2.1. For tested duct systems, the leakage shall be the applicable maximum rate from Section 403.2.2.	As tested or as specified in Table 405.5.2(2) if not tested. Using Proposed Design duct locations and a DSE of 0.88, except when tested in accordance with ASHRAE Standard 152(n), in which case measured duct air leakage values shall be used.
Thermostat	Type: manual Temperature setpoints: cooling temperature set point = 75 78 F; heating temperature set point = 72 68 F	Type: Same As proposed Same as standard reference Temperature setpoints: same as the Standard Reference Design, except when programmable thermostats are used.

Notes:

(a) Glazing shall be defined as sunlight-transmitting fenestration, including the area of sash, curbing or other framing elements, that enclose conditioned space. Glazing includes the area of sunlight-transmitting fenestration assemblies in walls bounding conditioned basements. For doors where the sunlight-transmitting opening is less than one-third of the door area, the glazing area of the sunlight transmitting opening shall be used. For all other doors, the glazing area shall be the rough frame opening area for the door, including the door and the frame.

(b) For residences with conditioned basements and for multiple family attached homes the following formula shall be used to determine total window area:

AF = 0.18 x AFL x FA x F

where:

AF = Total fenestration area

AFL = Total floor area of directly conditioned space

FA = (Above-grade thermal boundary gross wall area) / (above-grade boundary gross wall area + 0.5 x below-grade boundary gross wall area)

F = (Above-grade thermal boundary gross wall area) / (above-grade thermal boundary gross wall area + common gross wall area) or 0.56 whichever is greater

and where:

Thermal boundary wall is any wall that separates conditioned space from unconditioned space or ambient conditions

Above-grade thermal boundary wall is any portion of a thermal boundary wall not in contact with soil

Below-grade boundary wall is any portion of a thermal boundary wall in soil contact

Common wall is the total wall area of walls adjacent to another conditioned living unit, not including common foundation and attic walls.

(c) For fenestrations facing within 15 degrees of due south that are directly coupled to thermal storage mass, the winter interior shade coefficient shall be permitted to increase to 0.95 in the proposed design.

(d) Where Leakage Area (L) is defined in accordance with Section 5.1 of ASHRAE Standard 119 and where:

SLA = L / CFA (where L and CFA are in the same units).
Hourly calculations using the procedures given in the ASHRAE Handbook of Fundamentals, Chapter 27, page 27.21, equation 40
(Sherman-Grimsrud model) using Shelter Class 4 shall be used to determine the air exchange rate resulting from infiltration.

(e) Tested envelope leakage shall be determined in accordance with Section 5.1 of ASHRAE Standard 119 and documented by a Certified Class 1 Florida Rater. Either hourly calculations using the procedures given in the ASHRAE Handbook of Fundamentals, Chapter 27, page 27.21, equation 40 (Sherman-Grimsrud model) using Shelter Class 4 shall be used to determine the air exchange rates resulting from infiltration.

(f) The combined air exchange rate for infiltration and mechanical ventilation shall be determined in accordance with Equation 43 of ASHRAE Handbook of Fundamentals page 27.23.

(g) Thermal storage element shall mean a component not normally part of the floors, walls, or ceilings that is part of a passive solar system, and that provides thermal storage such as enclosed water columns, rock beds, or phase change containers. A thermal storage element must be in the same room as fenestration that faces within 15 degrees of due south, or must be connected to such a room with pipes or ducts that allow the element to be actively charged.

(h) For a Proposed Design with multiple heating, cooling, or water heating systems using different fuel types, the applicable system capacities and fuel types shall be weighted in accordance with the loads distribution (as calculated by accepted engineering practice for that equipment and fuel type) of the subject multiple systems. For the Standard Reference Design, the prevailing federal minimum efficiency shall be assumed except that the efficiencies given in Table 405.5.2(2) below will be assumed when:

1) A type of device not covered by NAECA is found in the As-Built Home;

2) The Proposed Design is heated by electricity using a device other than an air source heat pump; or

3) The Proposed Design does not contain one or more of the required HVAC equipment systems.

TABLE 405.5.2(2)
DEFAULT STANDARD REFERENCE DESIGN HOME
Heating and Cooling Equipment Efficiencies ^{(i) (k) (m) (n)}

As-Built Home Fuel	Function	Baseline Home Device
Electric	Heating	7.7 HSPF air source heat pump
Non-electric warm air furnace or space heater	Heating	78% AFUE gas furnace
Non-electric boiler	Heating	80% AFUE gas boiler
Any type	Cooling	13 SEER electric air conditioner

(i) For a Proposed Design without a proposed heating system, a heating system with the prevailing federal minimum efficiency shall be assumed for both the Standard Reference Design home and Proposed Design home. For electric heating systems, the prevailing federal minimum efficiency air-source heat pump shall be selected.

(k) For an Proposed Design home without a proposed cooling system, an electric air conditioner with the prevailing federal minimum efficiency shall be assumed for both the Standard Reference Design and the Proposed Design home.

(m) For a Proposed Design home with a non-storage type water heater, a 40-gallon storage-type water heater with the prevailing federal minimum efficiency and with the same fuel as the proposed water heater shall be assumed for the Standard Reference Design home. For the case of a Proposed Design home without a proposed water heater, a 40-gallon storage-type water heater with the prevailing federal minimum efficiency with the same fuel as the predominant heating fuel type shall be assumed for both the Proposed Design and Standard Reference Design.

(n) Tested duct leakage shall be determined and documented by a Certified Class 1 Florida Rater.

TABLE 405.5.2(3)

COEFFICIENTS ‘a’ AND ‘b’

Fuel type and End Use	a	b
Electric space heating Fossil fuel* space heating Biomass space heating Electric air conditioning Electric water heating Fossil fuel* water heating	2.2561 1.0943 0.8850 3.8090 0.9200 1.1877	0 0.4043 0.4047 0 0 1.0130

*Such as natural gas, LP, fuel oil