TABLE 3.20A

MAXIMUM EXTERIOR LOADBEARING AND NON-LOADBEARING STUD LENGTHS FOR COMMON LUMBER SPECIES RESISTING INTERIOR ZONE WIND LOADS

(Fully Sheathed with a Minimum Sheathing Material)^a

Three Second Gust Wind Speed (mph)

100

110

Stud
Spacing
(in.)

Species

Grade

2x4

2x6

2x8

2x4

2x6

2x8

2x4

2x6

2x8

2x4

2x6

2x8

Maximum Allowable Stud Length (ft.-in.)¹

Douglas Fir-Larch

Hem-Fir

Southern Pine

Spruce-Pine-Fir

Stud

Standard

Stud

Standard

Stud

Standard

Stud

Standard

17-7

16-11

16-7

15-2

12-7

16-7

16-3

15-6

15-1

12-7

17-3

16-11

16-7

15-10

13-6

16-3

15-10

15-1

12-7

20-0

16-11

16-3

15-11

14-3

11-10

15-11

15-7

14-11

14-3

11-10

16-7

16-3

15-11

14-11

12-8

15-7

15-3

14-3

11-10

20-0

15-9

15-2

14-10

12-9

10-7

14-10

14-7

13-10

12-9

10-7

15-6

15-2

14-10

13-4

11-4

14-7

14-3

12-9

10-7

20-0

19-2

20-0

19-2

20-0

19-2

20-0

14-9

14-3

13-11

11-6

9-7

13-11

13-8

13-0

11-6

9-7

14-6

14-3

13-11

12-1

10-3

13-8

13-4

11-6

9-7

20-0

17-4

20-0

17-4

20-0

18-4

20-0

17-4

20-0

Douglas Fir-Larch

Hem-Fir

Southern Pine

Spruce-Pine-Fir

Stud

Standard

Stud

Standard

Stud

Standard

Stud

Standard

15-11

15-4

15-1

13-0

10-10

15-1

14-9

14-1

13-0

10-10

15-8

15-4

15-1

13-7

11-7

14-9

14-5

13-0

10-10

20-0

19-7

20-0

19-7

20-0

19-7

20-0

15-4

14-9

14-6

12-3

10-2

14-6

14-2

13-6

12-3

10-2

15-1

14-9

14-6

12-10

10-10

14-2

13-10

12-3

10-2

20-0

18-5

20-0

18-5

20-0

19-6

20-0

18-5

20-0

14-4

13-9

13-6

10-11

9-1

13-6

13-3

12-7

10-11

9-1

14-1

13-9

13-6

11-5

9-9

13-3

12-11

10-11

9-1

20-0

16-5

20-0

19-10

16-5

20-0

17-5

20-0

16-5

20-0

13-5

12-11

12-8

9-10

8-2

12-8

12-5

11-10

9-10

8-2

13-2

12-11

12-8

10-4

8-9

12-5

12-1

9-10

8-2

20-0

19-7

14-10

19-11

19-6

18-7

14-10

20-0

19-11

15-8

19-6

19-1

14-10

20-0

19-1

20-0

19-1

20-0

19-1

Douglas Fir-Larch

Hem-Fir

Southern Pine

Spruce-Pine-Fir

Stud

Standard

Stud

Standard

Stud

Standard

Stud

Standard

13-11

13-5

13-2

10-6

8-8

13-2

12-10

12-3

10-6

8-8

13-8

13-5

13-2

11-0

9-4

12-10

12-7

10-6

8-8

20-0

15-9

20-0

19-3

15-9

20-0

16-8

20-0

19-9

15-9

20-0

13-5

12-11

12-8

9-10

8-2

12-8

12-5

11-10

9-10

8-2

13-2

12-11

12-8

10-4

8-9

12-5

12-1

9-10

8-2

20-0

19-7

14-9

19-11

19-6

18-7

14-9

20-0

19-11

15-8

19-6

19-0

14-9

20-0

19-1

20-0

19-1

20-0

19-1

12-6

12-0

11-7

8-9

11-10

11-7

11-0

8-9

12-3

12-0

11-10

9-3

7-10

11-7

11-3

8-9

19-8

18-9

17-6

13-2

18-7

18-2

17-3

13-2

19-3

18-11

18-5

14-0

18-2

17-6

13-2

20-0

17-0

20-0

17-0

20-0

18-1

20-0

17-0

11-9

11-3

10-6

7-11

11-1

10-10

10-4

7-11

11-6

11-4

11-1

8-4

10-10

10-6

7-11

18-5

16-11

15-9

11-11

17-5

16-6

15-6

11-11

18-1

17-9

16-7

12-7

17-0

15-9

11-11

20-0

15-4

20-0

15-4

20-0

16-4

20-0

15-4

- Lumber grade not available or allowable stud length is less than 7'-9" (For 8' wall height).

^a Maximum stud lengths in Table 3.20A are based on interior zone loads and assume that all studs are sheathed with a minimum sheathing material. Studs within 4' of corners shall be sheathed on the exterior with a minimum of 3/8" wood structural panels and on the interior with a minimum sheathing material, or stud spacings shall be multiplied by 0.85 for framing located within 4' of corners to account for the additional end zone loding requirements. The additional bending capacity provided by the wood structural panels or reduced stud spacing is assumed to be sufficient to resist the additional end zone loading requirements.

See Footnote 1

TABLE 3.20A

MAXIMUM EXTERIOR LOADBEARING AND NON-LOADBEARING STUD LENGTHS FOR COMMON LUMBER SPECIES RESISTING INTERIOR ZONE WIND LOADS

(Fully Sheathed with a Minimum Sheathing Material)^a

Three Second Gust Wind Speed (mph)

120

130

140

150

Stud
Spacing
(in.)

Species

Grade

2x4

2x6

2x8

2x4

2x6

2x8

2x4

2x6

2x8

2x4

2x6

2x8

Maximum Allowable Stud Length (ft.-in.)¹

Douglas Fir-Larch

Hem-Fir

Southern Pine

Spruce-Pine-Fir

Stud

Standard

Stud

Standard

Stud

Standard

Stud

Standard

13-11

13-5

13-2

10-6

8-8

13-2

12-11

12-3

10-6

8-8

13-8

13-5

13-2

11-0

9-4

12-11

12-7

10-6

8-8

20-0

15-9

20-0

19-4

15-9

20-0

16-8

20-0

19-9

15-9

20-0

13-3

12-9

12-6

9-8

8-0

12-6

12-3

11-8

9-8

8-0

13-0

12-9

12-6

10-1

8-7

12-3

11-11

9-8

8-0

20-0

19-2

14-5

19-7

19-2

18-4

14-5

20-0

19-7

15-4

19-2

18-9

14-5

20-0

18-8

20-0

18-8

20-0

19-10

20-0

18-8

12-7

12-1

11-9

8-11

11-11

11-8

11-1

8-11

12-4

12-1

11-11

9-4

7-11

11-8

11-4

8-11

19-9

19-0

17-8

13-4

18-8

18-3

17-5

13-4

19-5

19-1

18-7

14-2

18-3

17-8

13-4

20-0

17-2

20-0

17-2

20-0

18-4

20-0

17-2

12-0

11-7

10-11

8-3

11-4

11-1

10-7

8-3

11-10

11-7

11-4

8-8

11-1

10-10

8-3

18-11

17-8

16-5

12-5

17-10

17-2

16-2

12-5

18-7

18-2

17-3

13-1

17-5

16-5

12-5

20-0

16-0

20-0

16-0

20-0

17-0

20-0

16-0

Douglas Fir-Larch

Hem-Fir

Southern Pine

Spruce-Pine-Fir

Stud

Standard

Stud

Standard

Stud

Standard

Stud

Standard

12-8

12-2

11-11

9-0

12-0

11-8

11-2

9-0

12-5

12-2

12-0

9-5

8-0

11-8

11-5

9-0

19-11

19-2

17-10

13-6

18-10

18-5

17-6

13-6

19-7

19-2

18-10

14-3

18-5

17-10

13-6

20-0

17-5

20-0

17-5

20-0

18-6

20-0

17-5

12-0

11-7

10-11

8-3

11-4

11-1

10-7

8-3

11-10

11-7

11-4

8-8

11-1

10-10

8-3

18-10

17-7

16-5

12-5

17-10

17-2

16-2

12-5

18-6

18-2

17-3

13-1

17-5

16-5

12-5

20-0

16-0

20-0

16-0

20-0

17-0

20-0

16-0

11-5

10-10

10-1

10-10

10-6

9-11

11-3

11-0

10-10

8-0

10-7

10-1

18-0

16-3

15-2

11-5

17-0

15-10

14-11

11-5

17-8

17-4

15-11

12-1

16-7

15-2

11-5

20-0

19-6

14-9

20-0

19-3

14-9

20-0

15-8

20-0

19-6

14-9

10-11

10-1

9-4

10-4

9-9

9-3

10-9

10-6

10-1

9-4

17-2

15-1

14-1

10-8

16-2

14-8

13-10

10-8

16-10

16-6

14-9

11-3

15-10

14-1

10-8

20-0

19-6

18-1

13-8

20-0

18-11

17-10

13-8

20-0

19-6

14-7

20-0

18-1

13-8

Douglas Fir-Larch

Hem-Fir

Southern Pine

Spruce-Pine-Fir

Stud

Standard

Stud

Standard

Stud

Standard

Stud

Standard

11-1

10-3

9-7

10-5

10-0

9-5

10-10

10-8

10-3

9-7

17-5

15-5

14-4

10-10

16-5

15-0

14-2

10-10

17-1

16-9

15-1

11-6

16-1

14-4

10-10

20-0

19-11

18-6

14-0

20-0

19-4

18-3

14-0

20-0

19-11

14-11

20-0

18-6

14-0

10-6

9-5

8-9

9-11

9-2

8-8

10-4

10-1

9-5

9-8

8-9

16-6

14-2

13-2

10-0

15-7

13-9

13-0

10-0

16-2

15-11

13-10

10-7

15-3

13-2

10-0

20-0

18-3

17-0

12-10

20-0

17-9

16-9

12-10

20-0

18-3

13-8

20-0

17-0

12-10

10-0

8-9

8-1

9-5

8-6

8-0

9-10

9-7

8-9

9-3

8-1

15-8

13-1

12-2

9-3

14-10

12-9

12-0

9-3

15-5

14-10

12-10

9-9

14-6

12-2

9-3

20-0

16-10

15-8

11-10

19-6

16-5

15-5

11-10

20-0

19-0

16-10

12-8

19-0

15-8

11-10

9-6

8-1

9-0

7-11

9-4

9-1

8-1

8-10

14-10

12-2

11-4

8-7

14-2

11-10

11-2

8-7

14-9

13-10

11-11

9-1

13-8

11-4

8-7

19-1

15-8

14-7

11-0

18-8

15-3

14-4

11-0

19-5

17-8

15-8

11-9

17-8

14-7

11-0

- Lumber grade not available or allowable stud length is less than 7'-9" (For 8' wall height).

See Footnote 1

TABLE 3.20B

MAXIMUM EXTERIOR LOADBEARING AND NON-LOADBEARING STUD LENGTHS FOR COMMON LUMBER SPECIES RESISTING INTERIOR ZONE WIND LOADS

(Fully Sheathed with a Minimum of 3/8" Wood Structural Panels)^a

Three Second Gust Wind Speed (mph)

100

110

Stud
Spacing
(in.)

Species

Grade

2x4

2x6

2x8

2x4

2x6

2x8

2x4

2x6

2x8

2x4

2x6

2x8

Maximum Allowable Stud Length (ft.-in.)¹

Douglas Fir-Larch

Hem-Fir

Southern Pine

Spruce-Pine-Fir

Stud

Standard

Stud

Standard

Stud

Standard

Stud

Standard

17-7

16-11

16-7

15-10

14-6

16-7

16-3

15-6

15-1

14-6

17-3

16-11

16-7

15-10

15-6

16-3

15-10

15-1

14-6

20-0

16-11

16-3

15-11

15-3

13-8

15-11

15-7

14-11

14-6

13-8

16-7

16-3

15-11

15-3

14-7

15-7

15-3

14-6

13-8

20-0

15-9

15-2

14-10

14-3

12-2

14-10

14-7

13-10

13-6

12-2

15-6

15-2

14-10

14-3

13-1

14-7

14-3

13-6

12-2

20-0

14-9

14-3

13-11

13-3

11-0

13-11

13-8

13-0

12-8

11-0

14-6

14-3

13-11

13-4

11-9

13-8

13-4

12-8

11-0

20-0

18-10

20-0

18-10

20-0

19-11

20-0

18-10

20-0

Douglas Fir-Larch

Hem-Fir

Southern Pine

Spruce-Pine-Fir

Stud

Standard

Stud

Standard

Stud

Standard

Stud

Standard

15-11

15-4

15-1

14-5

12-5

15-1

14-9

14-1

13-8

12-5

15-8

15-4

15-1

14-5

13-4

14-9

14-5

13-8

12-5

20-0

15-4

14-9

14-6

13-10

11-8

14-6

14-2

13-6

13-2

11-8

15-1

14-9

14-6

13-10

12-6

14-2

13-10

13-2

11-8

20-0

14-4

13-9

13-6

12-7

10-5

13-6

13-3

12-7

12-3

10-5

14-1

13-9

13-6

12-11

11-2

13-3

12-11

12-3

10-5

20-0

17-11

20-0

19-10

17-11

20-0

18-11

20-0

17-11

20-0

13-5

12-11

12-8

11-4

9-5

12-8

12-5

11-10

11-4

9-5

13-2

12-11

12-8

11-11

10-1

12-5

12-1

11-4

9-5

20-0

19-11

16-2

19-11

19-6

18-7

16-2

20-0

19-11

17-1

19-6

19-1

16-2

20-0

Douglas Fir-Larch

Hem-Fir

Southern Pine

Spruce-Pine-Fir

Stud

Standard

Stud

Standard

Stud

Standard

Stud

Standard

13-11

13-5

13-2

12-1

10-0

13-2

12-10

12-3

11-11

10-0

13-8

13-5

13-2

12-7

10-9

12-10

12-7

11-11

10-0

20-0

17-2

20-0

19-3

17-2

20-0

18-2

20-0

19-9

17-2

20-0

13-5

12-11

12-8

11-4

9-5

12-8

12-5

11-10

11-4

9-5

13-2

12-11

12-8

11-11

10-1

12-5

12-1

11-4

9-5

20-0

19-11

16-1

19-11

19-6

18-7

16-1

20-0

19-11

17-1

19-6

19-0

16-1

20-0

19-11

20-0

19-11

20-0

19-11

12-6

12-0

11-10

10-2

8-5

11-10

11-7

11-0

10-2

8-5

12-3

12-0

11-10

10-7

9-0

11-7

11-3

10-2

8-5

19-8

18-11

18-7

14-5

18-7

18-2

17-4

14-5

19-3

18-11

18-7

15-3

18-2

17-9

14-5

20-0

17-10

20-0

17-10

20-0

18-11

20-0

17-10

11-9

11-4

11-1

9-2

11-1

10-10

10-4

9-2

11-6

11-4

11-1

9-7

8-2

10-10

10-7

9-2

18-5

17-9

17-2

13-0

17-5

17-0

16-3

13-0

18-1

17-9

17-5

13-9

17-0

16-8

13-0

20-0

16-1

20-0

16-1

20-0

17-1

20-0

16-1

- Lumber grade not available or allowable stud length is less than 7'-9" (For 8' wall height).

^a Maximum stud lengths in Table 3.20B are based on interior zone loads and assume that all studs are sheathed on the exterior with a minimum of 3/8" wood structural panels and on the interior with a minimum sheathing material. Stud spacings shall be multiplied by 0.85 for framing located within 4' of corners to account for the additional end zone loading requirements.

See Footnote 1

TABLE 3.20B

MAXIMUM EXTERIOR LOADBEARING AND NON-LOADBEARING STUD LENGTHS FOR COMMON LUMBER SPECIES RESISTING INTERIOR ZONE WIND LOADS

(Fully Sheathed with a Minimum of 3/8" Wood Structural Panels)^a

Three Second Gust Wind Speed (mph)

120

130

140

150

Stud
Spacing
(in.)

Species

Grade

2x4

2x6

2x8

2x4

2x6

2x8

2x4

2x6

2x8

2x4

2x6

2x8

Maximum Allowable Stud Length (ft.-in.)¹

Douglas Fir-Larch

Hem-Fir

Southern Pine

Spruce-Pine-Fir

Stud

Standard

Stud

Standard

Stud

Standard

Stud

Standard

13-11

13-5

13-2

12-1

10-0

13-2

12-11

12-3

12-0

10-0

13-8

13-5

13-2

12-7

10-9

12-11

12-7

12-0

10-0

20-0

17-2

20-0

19-4

17-2

20-0

18-2

20-0

19-9

17-2

20-0

13-3

12-9

12-6

11-1

9-3

12-6

12-3

11-8

11-1

9-3

13-0

12-9

12-6

11-7

9-10

12-3

11-11

11-1

9-3

20-0

19-7

15-9

19-7

19-2

18-4

15-9

20-0

19-7

16-8

19-2

18-9

15-9

20-0

19-6

20-0

19-6

20-0

19-6

12-7

12-1

11-11

10-3

8-6

11-11

11-8

11-1

10-3

8-6

12-4

12-1

11-11

10-9

9-1

11-8

11-4

10-3

8-6

19-9

19-1

18-8

14-7

18-8

18-3

17-5

14-7

19-5

19-1

18-8

15-5

18-3

17-10

14-7

20-0

18-0

20-0

18-0

20-0

19-2

20-0

18-0

12-0

11-7

11-4

9-6

7-11

11-4

11-1

10-7

9-6

7-11

11-10

11-7

11-4

10-0

8-6

11-1

10-10

9-6

7-11

18-11

18-2

17-10

13-6

17-10

17-5

16-8

13-6

18-7

18-2

17-10

14-4

17-5

17-1

13-6

20-0

16-8

20-0

16-8

20-0

17-9

20-0

16-8

Douglas Fir-Larch

Hem-Fir

Southern Pine

Spruce-Pine-Fir

Stud

Standard

Stud

Standard

Stud

Standard

Stud

Standard

12-8

12-2

12-0

10-4

8-7

12-0

11-8

11-2

10-4

8-7

12-5

12-2

12-0

10-10

9-3

11-8

11-5

10-4

8-7

19-11

19-2

18-10

14-9

18-10

18-5

17-6

14-9

19-7

19-2

18-10

15-7

18-5

18-0

14-9

20-0

18-2

20-0

18-2

20-0

19-4

20-0

18-2

12-0

11-7

11-4

9-6

7-11

11-4

11-1

10-7

9-6

7-11

11-10

11-7

11-4

10-0

8-5

11-1

10-10

9-6

7-11

18-10

18-2

17-10

13-6

17-10

17-5

16-8

13-6

18-6

18-2

17-10

14-3

17-5

17-1

13-6

20-0

16-8

20-0

16-8

20-0

17-9

20-0

16-8

11-5

11-0

10-10

8-9

10-10

10-7

10-1

8-9

11-3

11-0

10-10

9-2

7-10

10-7

10-4

8-9

18-0

17-4

16-6

12-6

17-0

16-7

15-10

12-6

17-8

17-4

17-0

13-2

16-7

16-3

12-6

20-0

15-5

20-0

15-5

20-0

16-5

20-0

15-5

10-11

10-6

10-4

8-2

10-4

10-1

9-7

8-2

10-9

10-6

10-4

8-7

10-1

9-10

8-2

17-2

16-6

15-4

11-7

16-2

15-10

15-1

11-7

16-10

16-6

16-1

12-3

15-10

15-4

11-7

20-0

18-11

14-4

20-0

19-10

18-8

14-4

20-0

15-3

20-0

18-11

14-4

Douglas Fir-Larch

Hem-Fir

Southern Pine

Spruce-Pine-Fir

Stud

Standard

Stud

Standard

Stud

Standard

Stud

Standard

11-1

10-8

10-5

8-4

10-5

10-3

9-9

8-4

10-10

10-8

10-5

8-9

10-3

10-0

8-4

17-5

16-9

15-8

11-10

16-5

16-1

15-4

11-10

17-1

16-9

16-5

12-6

16-1

15-8

11-10

20-0

19-4

14-8

20-0

19-1

14-8

20-0

15-7

20-0

19-4

14-8

10-6

10-1

9-11

9-8

9-3

10-4

10-1

9-11

8-0

9-8

9-6

16-6

15-5

14-4

10-10

15-7

15-0

14-2

10-10

16-2

15-11

15-1

11-6

15-3

14-4

10-10

20-0

19-1

17-9

13-5

20-0

18-7

17-6

13-5

20-0

19-1

14-4

20-0

17-9

13-5

10-0

9-7

9-4

9-5

9-3

8-10

9-10

9-7

9-5

9-3

9-0

15-8

14-3

13-3

10-0

14-10

13-10

13-1

10-0

15-5

15-1

14-0

10-7

14-6

13-3

10-0

20-0

17-8

16-5

12-5

19-6

17-2

16-2

12-5

20-0

19-11

17-8

13-2

19-1

16-5

12-5

9-6

9-2

8-8

9-0

8-10

8-5

9-4

9-2

9-0

8-10

8-7

15-0

13-3

12-4

9-4

14-2

12-11

12-2

9-4

14-9

14-5

13-0

9-10

13-10

12-4

9-4

19-9

16-5

15-3

11-6

18-8

15-11

15-0

11-6

19-5

18-6

16-5

12-3

18-3

15-3

11-6

- Lumber grade not available or allowable stud length is less than 7'-9" (For 8' wall height).

See Footnote 1

Footnotes to Tables 3.20A&B

¹ Maximum stud lengths in Tables 3.20A&B are based on wind loads. For dead and live loads, stud lengths shall be limited to the requirements in the following table:

	2x3	2x4	2x5	2x6	2x8
	Maximum Unsupported Stud Length (ft.)
	-	10	10	10	10
Loadbearing Studs Supporting:	Maximum Stud Spacing (in. o.c.)
Roof & Ceiling Only 1 Floor Only Roof, Ceiling & 1 Floor 2 Floors Only Roof, Ceiling & 2 Floors	- - - - -	24 24 16 16 -	24 24 16 16 -	24 24 24 24 16	24 24 24 24 24
	Maximum Unsupported Stud Length (ft.)
Non-loadbearing Studs	10	14	16	20	20
	Maximum Stud Spacing (in. o.c.)
	16	24	24	24	24