2012 SUPPLEMENT TO THE FLORIDA BUILDING CODE, ENERGY CONSERVATION
Chapter
1 - Administration
Limit scope of Section 101.4.7.1 and
101.4.7.2 to residential buildings as follows:
101.4.7.1 Replacement HVAC
equipment
101.4.7.1.1 Duct sealing upon equipment replacement (Mandatory). At the time of the total replacement of HVAC evaporators and condensing units for residential buildings, all accessible (a minimum of 30 inches clearance) joints and seams in the air distribution system shall be inspected and sealed where needed using reinforced mastic or code approved equivalent and shall include a signed certification by the contractor that is attached to the air handler unit stipulating that this work has been accomplished.
Exceptions:
1.
Ducts in conditioned space.
2.
Joints or seams that are already sealed with fabric and mastic.
3. If
system is tested and repaired as necessary.
101.4.7.1.2 Replacement equipment sizing (Mandatory). An A/C contractor or licensed Florida PE shall submit a nationally recognized method based sizing calculation to the code official at the time of permit application for total replacement of the condensing and evaporator components of HVAC systems for residential buildings in accordance with Florida law and the provisions of Section 403.6.1 or Section 503.2.1, as applicable.
Reorganize exempt building section and add
Florida-specific exemptions from previous code as follows:
101.4.8 Exempt buildings. Buildings exempt from the provisions of
the Florida Building Code, Energy
Conservation, include existing
buildings except those considered renovated buildings, changes of occupancy
type, or previously unconditioned buildings to which comfort conditioning is
added. Exempt buildings include
those specified in Sections 101.4.8.1 through 101.4.8.5.
101.4.8.1 Federal standards. Any building for which federal mandatory standards preempt state energy codes
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.
101.4.8.3 Historic buildings. Any building meeting the
criteria for historic buildings in Section 101.4.2.
101.4.8.4 Low energy buildings as described in Section 101.5.2. Such buildings shall not contain electrical, plumbing or mechanical systems which have been designed to accommodate the future installation of heating or cooling equipment.
101.4.8.5
Buildings designed for purposes other than general space comfort conditioning. Any building where heating or cooling systems
are provided which are designed for purposes other than general space comfort
conditioning. Buildings included in this exemption include:
1. Commercial service areas where only ceiling
radiant heaters or spot coolers are to be installed which will provide heat or
cool only to a single work area and do not provide general heating or cooling
for the space.
2. Buildings heated with a system designed to
provide sufficient heat only to prevent freezing of products or systems. Such
systems shall not provide heating above 50°F (10°C).
3. Pre-manufactured freezer or refrigerated
storage buildings and areas where the temperature is set below 40°F (4°C) and
in which no operators work on a regular basis.
4. Electrical equipment switching buildings
which provide space conditioning for equipment only and in which no operators
work on a regular basis except that the provisions of Section 505.7 shall
apply.
5. Buildings containing a system(s) designed and
sold for dehumidification purposes only and controlled only by a humidistat. No
thermostat shall be installed on systems thus exempted from this code.
Chapter
4 – Residential Energy Efficiency
Revise Section 401.2 as follows:
401.2 Compliance. Projects shall comply with Sections 401,
402.4, 402.5, and 403.1.1, 403.1.3, 403.1.4, 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, 403.1.2, 403.2.1 and 404.1 (prescriptive);
or
2. Section 405 (performance).
Revise Table 402.1.1.3 to correct mass wall U-factors as follows:
TABLE 402.1.1.3
EQUIVALENT
U-FACTORSa,f,g
|
FENESTRATION U-FACTORe |
SKYLIGHT U-FACTOR |
CEILING U-FACTORh |
FRAME WALL U-FACTORb |
MASS WALL U-FACTOR |
FLOOR U-FACTOR |
BASEMENT WALL U-FACTORd |
CRAWL
SPACE WALL U-FACTORc |
|
0.65 |
0.75 |
0.035 |
0.082 |
0.096 |
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 exterior interior,
the mass wall U-factors
shall be a maximum of 0.105 0.165.
c.
Basement wall U-factor of
0.360.
d.
Foundation U-factor
requirements shown in Table 402.1.1.3 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 402.1.1.3 (total UA alternative)
shall be modified to include soil conductivity and exterior air films.
e.
Window to floor area, including skylights, shall not exceed 20 percent. See
Section 402.1.2.3.
f.
Limitations to compliance by Section 402 found in Section 402.1.2 shall be met.
g.
Ducts and air handlers shall be located inside both the thermal and air barrier
of the home. Air leakage shall be no more than Qn=0.03 when tested per Section
403.2.2.1.
h. Roof reflectance shall be no more than
0.25 in accordance with testing to Section 405.6.2.
Revise
Section 403.1 as follows:
403.1 Controls (Mandatory). At least one
thermostat shall be provided for each separate heating and cooling system.
403.1.1
Thermostat Provision (Mandatory). At least one thermostat shall be provided
for each separate heating and cooling system.
403.1.21
Programmable thermostat (Prescriptive). Where the primary heating system is a
forced-air furnace, at least one thermostat per dwelling unit shall be 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).
403.1.32
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.
403.1.43 Humidity control (Mandatory).
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.
Change Section 403.2 as follows:
403.2 Ducts.
403.2.1 Insulation(Prescriptive) Supply and
return ducts, including air filter enclosures, air ducts and plenums, located
in attics or o roofs shall be insulated to a minimum of R-8. located
inside the building thermal envelope and 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.
12. Exhaust air ducts
23. 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 Section 503.2.7.2 of this code 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 ASHRAE Standard
152 by either a Class 1 BERS rater or a Class A, B or Mechanical air-conditioning
contractor. 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” by one of the following methods:
1. Post
construction test: Leakage to outdoors shall be less than or equal to 3 cfm
(84.9 L/min) per 100 ft2 (9.29 m2) of conditioned
floor area and or
a total leakage less than or equal to 9 cfm (254 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 4 cfm (113.3 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 2 cfm (56.3 L/min) per 100 ft2 (9.29 m2) of conditioned floor area.
Exception: Duct testing is not mandatory for buildings complying by Section 405 of this code.
Add Section 405.6.6 as follows:
405.6.6
Installation criteria for homes using the ceiling fan option. The ceiling fan
option shall apply a 2% reduction in cooling energy use for the proposed design
if one or more ceiling fans are installed in each of the bedrooms and a minimum
of one ceiling fan is installed in all primary living areas (living rooms,
family rooms, or great rooms). This shall not include spaces designed to be
dining rooms or dining areas. Areas separated by permanently fixed archways,
walls, or dividers shall be considered separate rooms. The following criteria
shall be met:
1. Ceiling fans shall be installed with minimum fan
blade diameters of no less than those listed in Table 405.6.5 for the size and
shape of the room.
2. Where a primary living area is an “L-shaped” room
and the smaller portion of this area is 8 feet by 10 feet (2438 mm by 3048 mm)
or larger, a fan shall be installed in both the larger and smaller portions of
the primary living area.
Exception:
Credit shall not be taken for both ceiling fans and cross ventilation.
TABLE
405.6.6
FAN
SIZING TABLE
|
LONGEST WALL LENGTH (feet) |
MINIMUM FAN SIZE (inches) |
|
≤ 12 |
36 |
|
> 12 – 16 |
48 |
|
> 16 – 17.5 |
52 |
|
> 17.5 – 25 |
56 |
|
> 25 |
2 fans (minimum f 48 inches each) |
For SI: 1 inch =
25.4mm, 1 foot = 304.8 mm.
[Renumber section 405.6.6 to 405.6.7 and renumber section 405.6.7 to
405.6.8.]
Chapter 5 – Commercial
Energy Efficiency
Add reference to Section 502.1.1.1 as follows:
502.1.1.1 Shell buildings, renovations and alterations. The building thermal envelope shall meet the
requirements of Table 502.1.1.1(1) or Table 502.1.1.1(2). See Section 101.4.3 and
Section 101.4.9.
Change Tables
502.1.1.1(1) and 502.1.1.1(2) as follows:
TABLE 502.1.1.1 (1)
ENVELOPE PRESCRIPTIVE MEASURES FOR SHELL BUILDINGS1,2
[No change to rest of table]
|
Building
Element |
|
TABLE 502.1.1.1 (2)
ENVELOPE PRESCRIPTIVE
MEASURES FOR RENOVATIONS AND ALTERATIONS1
[No
change to rest of table]
|
Building Element |
Mandatory |
|
Roof: Absorptance R-value
(U-value) |
≤0.22 R-38 (U≤ 0.027
|
Revise Table
503.2.8 as follows:
TABLE 503.2.8
MINIMUM PIPE INSULATION (in.)1
|
Fluid
Design Operating Temperature Range (oF) |
Insulation
Conductivity |
Nominal
Pi pe or
Tube Size (in.) |
|||||||||
|
Conductivity Btu
in/(h ft2 .oF) |
Mean Temperature
Rating |
<1 |
1 - 1 ½ |
1 ½ -
4 |
4 -8 |
>8 |
|||||
|
Heating
Systems (Steam Condensate, and Hot Water)2,3 |
|||||||||||
|
>350 |
0.32 -
0.34 |
250 |
2.5 |
3.0 |
3.0 |
4.0 |
4.0 |
||||
|
251 – 350 |
0.29 -
0.32 |
200 |
1.5 |
2.5 |
3.0 |
3.0 |
3.0 |
||||
|
201 – 250 |
0.27 -
0.30 |
150 |
1.5 |
1.5 |
2.0 |
2.0 |
2.0 |
||||
|
141 – 200 |
0.25 -
0.29 |
125 |
1.01 |
1.0 |
1.0 |
1.5 |
1.5 |
||||
|
105 – 140 |
0.22-0.28 |
100 |
0.5 |
0.5 |
1.0 |
1.0 |
1.0 |
||||
|
Domestic
and Service Hot Water Systems3 |
|||||||||||
|
>105 |
0.22-0.28 |
100 |
0.5 |
0.5 |
1.0 |
1.0 |
1.0 |
||||
|
Cooling
Systems (Chilled Water, Brine, and Refrigerant)4 |
|||||||||||
|
40 – 60 |
0.22-0.28 |
100 |
0.5 |
0.5 |
1.0 |
1.0 |
1.0 |
||||
|
<40 |
0.22-0.28 |
100 |
0.5 |
1.0 |
1.0 |
1.0 |
1.5 |
||||
1For insulation outside
the stated conductivity range, the minimum thickness (T) shall be determined as
follows:
T=r{(1+t/r)K/k
– 1}
Where T= minimum insulation thickness
(in.), r=actual outside radius of pipe (in.), t=insulation thickness listed in
this table for applicable fluid temperature and pipe size, K=conductivity of
alternate material at mean rating temperature indicated for the applicable
fluid temperature (Btu.in.[h.ft2.oF]; and k=upper value
of the conductivity range listed in this table for applicable fluid
temperature.
2These thicknesses
are based on energy efficiency considerations only. Additional insulation is
sometimes required relative to safety issues/surface temperatures.
3 Piping insulation is not
required between the control valve and coil on run‐outs when the control
valve is
located within 4 feet of the coil and the
pipe size is 1 inch or less.
4 These thicknesses are
based on energy efficiency considerations only. Issues such as water vapor
permeability or surface condensation sometimes
require vapor retarders or additional insulation.
Fix Table 504.2 as shown:
TABLE 504.2
MINIMUM PERFORMANCE OF
WATER-HEATING EQUIPMENT
[No other change to table]
|
Electric table top water heaters |
≤ 12 kW |
Resistance |
0.93 - 0.00132V EF |
DOE 10 CFR Part 430 |
NORMATIVE APPENDIX B: CRITERIA FOR COMPUTER MODELING FOR
PERFORMANCE-BASED CODE COMPLIANCE
Correct Table B-1.1.2(1) (Residential) as
follows:
TABLE
B-1.1.2(1)
SPECIFICATIONS
FOR TH ESTANDARD REFERENCE AND PROPOSED DESIGNS
[No change to rest of table]
|
BUILDING
COMPONENT |
STANDARD
REFERENCE DESIGN |
PROPOSED
DESIGN |
|
Service water heating h,k |
Fuel type: same as Proposed Design Efficiency: in accordance with
prevailing federal minimum standards Use: (gal/day): 30 x Ndu +
10 x Nbr Where Ndu = number of
dwelling units Tank temperature: 120o F |
As proposed As proposed Same as standard reference design
Same as standard reference design |
|
Thermostat |
Type: Manual Temperature setpoints Cooling temperature setpoint = 780F Heating temperature setpoint = 68oF |
Type: Same as proposed Temperature
setpoints: same as the Standard Reference Design, except when programmable thermostats are
used. Programmable thermostat
setpoints: On weekdays cooling is 78oF
from 3pm to 8:59am and 80oF from 9am to 2:59pm. On weekends, cooling is 78oF for
24 hours. Heating is 68oF from 6am to
10:59pm and 66oF from 11 pm to 5:59 am seven days a week. |
Fix Section B-1.1.3.1 to make consistent with Section B-1.1.1 as follows:
B-1.1.3.1
Following normalization of the heating, cooling and hot water….If the total
normalized modified loads of the Proposed
Design home (nMEULtot) are equal to or less than 80 percent of the total reference loads of the Standard Reference Design home (REULtot)
the Proposed Design complies with
this code.
Correct Section B-2.6 (Commercial) as follows:
B-2.6 HVAC systems
B-2.6.1 Standard reference design.
[1 – 7, 10 No change]
8. Fan system efficiency (BHP per cfm of supply
air including the effect of belt losses but excluding motor and motor drive losses)
shall be the limit allowed in Table 503.2.10.1(1). same as the
proposed design or up to the limit prescribed in Section 503.2.10.1, whichever is smaller. If this limit is
reached, each fan shall be proportionally reduced in brake horsepower until the
limit is met. Fan electrical power shall then be determined by adjusting the
calculated fan HP by the minimum motor efficiency prescribed by Section 505.7.5
for the appropriate motor size for each fan.
9. The equipment capacities for the standard reference design shall
be sized proportionally to the capacities in the proposed design based
on sizing runs; i.e., the ratio between the capacities used in the annual
simulations and the capacities determined by the sizing runs shall be the same
for both the proposed design and standard reference design. Unmet
load hours for the proposed design shall not differ from unmet load
hours for the standard reference design by more than 50 hours
Correct and add to Table B-2.2 (Commercial) as follows:
TABLE
B-2.2
SPECIFICATIONS
FOR TH ESTANDARD REFERENCE AND PROPOSED DESIGNS
[No change to rest of table]
|
BUILDING
COMPONENT |
STANDARD
REFERENCE DESIGN |
PROPOSED
DESIGN |
|
Building envelope |
The standard
reference |
All components of the building envelope in the proposed
design shall be modeled as shown on architectural drawings or as
installed for existi7ng building envelopes. Exceptions: The following building elements are permitted to differ from architectural drawings. |
|
(a) Opaque assemblies such as roof, floors, doors, and
walls shall be modeled as having the same heat capacity as the proposed
design but with the maximum CZ1 CZ2 Roof Insulation above
deck U-0.063 U-0.063
Metal
building U-0.065 U-0.065 Attic &
other U-0.034 U-0.034 Walls, above-grade Mass U-0.580 U-0.580 Metal
building U-0.113 U-0.113 Steel framed U-0.124 U-0.124 Wood framed &
other U-0.089 U-0.089 Walls, below grade
C-1.140 C-1.140 Floors Mass U-0.322 U-0.137 Steel joist U-0.350 U-0.052 Wood framed &
other U-0.282 U-0.051 Slab-on-grade floors Unheated F-0.730 F-0.730 Heated F-1.020 F-1.020 Opaque doors Swinging U-0.700 U-0.700 Nonswinging U-1.450 U-1.450 High-rise residential buildings shall be modeled with
the maximum U-factors shown below:
CZ1 CZ2 Roof
Insulation above
deck U-0.063 U-0.063
Metal
building U-0.065 U-0.065 Attic &
other U-0.027 U-0.034 Walls, above-grade Mass U-0.151 U-0.151 Metal
building U-0.113 U-0.113 Steel framed U-0.124 U-0.124 Wood framed &
other U-0.089 U-0.089 Walls, below grade C-1.140 C-1.140 Floors Mass U-0.322 U-0.107 Steel joist U-0.350 U-0.052 Wood framed &
other U-0.282 U-0.051 Slab-on-grade floors Heated F-0.730 F-0.730 Unheated F-1.020 F-1.020 Opaque doors Swinging U-0.700 U-0.700 Nonswinging U-1.450 U-1.450 |
(a) Any envelope assembly that covers less than 5% of the total area of that assembly type (e.g., exterior walls) need not be separately described. If not separately described, the area of an envelope assembly must be added to the area of the adjacent assembly of that same type. |
|
|
(b) Roof albedo—All roof surfaces shall be modeled
with a reflectivity of 0.3. |
(b) Exterior surfaces whose azimuth orientation and tilt differ by no more than 45 degrees and are otherwise the same may be described as either a single surface or by using multipliers. |
|
|
(c) Fenestration—No shading projections
are to be modeled; fenestration shall be assumed to be flush with the
exterior wall or roof. If the fenestration area for new buildings or additions
exceeds 50% of wall area % of
wall area Max.U SHGC CZ1 CZ 2 0 – 10%
Ufixed 1.22 SHGCall 0.25
0.39 Uoper 1.27
SHGCnorth 0.61 0.61 10.1 – 20%
Ufixed 1.22 SHGCall 0.25 0.25 Uoper 1.27
SHGCnorth 0.61 0.61 20.1 – 30%
Ufixed 1.22 SHGCall 0.25 0.25 Uoper 1.27
SHGCnorth 0.61 0.61 30.1 – 40%
Ufixed 1.22 SHGCall 0.25 0.25 Uoper 1.27
SHGCnorth 0.44 0.61 40.1 – 50%
Ufixed 1.22 SHGCall 0.19 0.17 Uoper 1.27
SHGCnorth 0.33 0.42 Fenestration U-factor shall be the maximum required for the climate, and the solar heat gain coefficient shall be the maximum allowed for the climate and orientation. The fenestration model for envelope alterations shall reflect the limitations on area, U-factor, and solar heat gain coefficient as allowed by Section 101.4.3. |
(c) For exterior roofs other than roofs with
ventilated attics, the roof surface may be modeled with a reflectance of 0.45
if the reflectance of the proposed design roof is greater than 0.70 and its
emittance is greater than 0.75. The reflectance and emittance shall be
determined by a laboratory accredited by a nationally recognized
accreditation organization and shall be labeled and certified by the
manufacturer. All other roof surfaces shall be modeled with a reflectance of
0.3. Manually operated fenestration shading devices such
as blinds or shades shall not be modeled. Permanent shading devices such as
fins, overhangs, and light shelves shall be modeled. |
|
|
Schedules |
Same as proposed |
Operating schedules
shall include hourly profiles for daily operation and shall account for
variations between weekdays, weekends, holidays and any seasonal operation.
Schedules shall model the time-dependent variations in occupancy, illumination,
receptacle loads, thermostat settings, mechanical ventilation, HVAC equipment
availability, service hot water usage and any process loads. The schedules
shall be typical of the proposed building type |
APPENDIX C: FORMS
Make the following changes to
Table 402B of Form 402-2010 as follows:
Table 402B THERMAL ENVELOPE APPROACH MANDATORY
REQUIREMENTS
|
Components |
Section |
Requirements |
Check |
|
|
|
|
|
|
Air distribution system |
403.2 |
Ducts |
|
[No other changes made to table]