The table below lists the design code provisions applicable to design for wood structural panel sheathing from the AWC Special Design Provisions for Wind and Seismic (SDPWS) and the ASCE 7. One column is for the design code provision, the other is for the implementation in Shearwalls; in most cases they are the same.
Wood structural panels include the Structural Sheathing, Structural 1, and Plywood Siding materials. They are made of plywood or OSB, which is specified by a check box in Wall Input view. Design properties are identical for plywood and OSB; some parameters affecting deflection are influenced by the choice.
For some provisions, more detailed information is found in a table dedicated to the provision in another topic that is cross-referenced in this table.
Wood Structural Panels |
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Shearwalls |
SDPWS / ASCE 7 |
Main References: SDPWS 4.3.7.1, SDPWS Tables 4.3A and 4.3B |
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Wall Construction |
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(for more details, see Wall Construction ) |
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References |
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4.3.7.1. Table 4.3A, Table 4.3.5.3*, Table 3.2.1 |
Sud Spacing shear |
12",16",19.2", 24" |
Max 24” |
Max stud spacing bending |
12,16, 24 |
Table 3.2.1 |
Stud Thickness, nominal |
Default 2" |
2” |
Orientation - shear |
Horizontal or Vertical |
Both - 4.3.7.1 (1) |
Orientation - bending |
Horizontal or Vertical |
Both - Table 3.2.1 A |
Blocking |
Blocked or Unblocked |
Blocked or Unblocked |
Surface |
Either or both |
Either or both |
Height Limitation |
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4.3.5.3, 4.3.2.3.(8.) |
Unblocked walls |
16' |
16' |
Perforated walls |
Not applied |
20' |
Gypsum underneath |
Allowed |
Yes |
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* 19.2 stud spacing included for 20" option in Unblocked Adjustment Factor table 4.3.5.3 |
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Sheathing Thickness and Type |
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Plywood shear |
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Table 4.3A, |
All materials |
5/16, 3/8 |
5/16, 3/8 |
Structural I and Plywood sheathing |
also 7/16,15/32, |
also 7/16, 15/32 |
Plywood sheathing |
also 19/32 |
also 19/32 |
Plywood siding |
5/16, 3/8 only |
5/16, 3/8 only |
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Plywood Bending |
- |
Table 3.2.1 |
Plywood sheathing |
5/16*,3/8,7/16,15/32,19/32, 23/32 |
3/8,7/16,15/32, 19/32, 23/32 |
Plywood siding |
5/16, 3/8 |
Doesn't say |
*5/16 values taken from the Wood Frame Construction Manual. |
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Fastener Types and Sizes |
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(for more details, see Table for Fastener type and lengths) |
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Common nail |
6d,8d,10d,12d* |
6d,8d,10d |
Box nail |
6d,8d,10d,12d* |
6d,8d,10d |
Galvanised casing |
6d,8d |
6d,8d |
*12d size included for nail withdrawal calculations |
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Fastener spacing |
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(for more details, see Table for Fastener spacing) |
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Edge spacing |
2,3,4,6” |
2,3,4,6” |
Intermediate Spacing |
2,4,6,8,10,12”* |
6” or 12” max |
*Lower than maximum intermediate spacing values are provided for nail withdrawal resistance |
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Seismic Information |
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Allowable Design Categories |
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ASCE-7 Table 12.2-1, |
65 Feet or less |
Allows all |
Allows all |
Greater than 65 feet |
Screen warning for D, E, F |
Disallows D, E, F |
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Framing detail: For capacity >350 on either side |
Note 1 in Framing Materials Table |
4.3.7.1(5.c) |
Applicable zones |
D,E,F |
D,E,F |
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Response modification factor R |
Input in Site Dialog, Prompts to change upon load generation |
ASCE-7 Table 12.2-1, 12.8.1.1 |
R - bearing walls |
Default 6.5 |
6.5 |
R - building frames |
Default 7.0 |
7.0 |
Deflection amplification factor Cd |
Input in Site Dialog, Prompts to change upon load generation |
ASCE-7 Table 12.2-1, 12.8.6 |
Cd - bearing walls |
Default 4.0 |
4.0 |
Cd - building frames |
Default 4.5 |
4.5 |
Overstrength Factor W0 * |
Cannot be overriden |
ASCE-7 Table 12.2-1, inc. note b; 12.10.1.1. |
W0- bearing walls, rigid diaphragms |
3.0 |
2.5 |
W0- building frames, rigid diaphragms |
4.5 |
4.5 |
W0 - bearing walls, flexible diaphragms |
4.0 |
4.0 or 4.5 |
W0 - building frames, flexible diaphragms |
3.5 |
3.5 or 4.0 |
*for drag strut force from discontinuous shear lines above, only |
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Permissible Force Distribution Method |
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Refer to Shear Force Distribution Methods for more a description of these methods and how they are selected. |
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Reference |
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SDPWS 4.3.5.5.1 , inc. Exception 1 |
Deflection-based distribution |
Allowed, no reduction applied |
Allowed |
Capacity-based distribution |
Allowed, but more stringent aspect ratio adjustment applied |
Allowed with more stringent aspect ratio adjustment |
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Aspect Ratios and Capacity Adjustment |
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Aspect ratio = h/b; b = segment length, h =height. Applies to wall segments or FTAO piers. ( For more details see Aspect Ratio Limits and Factors ) |
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Maximum aspect ratio |
Aspect ratio shown in Elevation view and in Wall and Shearline output table |
SDPWS 4.3.3, Table 4.3.3 |
Blocked, unadjusted |
3.5:1 |
3.5:1 |
Blocked, adjusted |
2:1 |
2:1 |
Unblocked |
2:1 |
2:1 |
Shear Capacity Adjustment |
Shown in Shear Design Results. If not 1.0, shown in Elevation view. |
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Segmented or FTAO walls* |
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SDPWS 4.3.3.2, 4.3.5.5.1 Exception 1. |
Capacity-based force distribution |
2b/h |
2b/h |
Deflection-based distribution |
1.25 - 0.125 h/b |
1.25 - 0.125 h/b |
Perforated walls |
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SDPWS 4.3.5.6, 4.3.3.4, Eqn. 4.3-5 |
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Sbi /Sb; bi = 2b/h when h/b > 2 |
Sbi /Sb; bi = 2b/h when h/b > 2 |
*Applies to blocked shear wall segments with aspect ratio between 2 and 3.5. |
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Shear Capacity Adjustments and Notes |
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The following factors and adjustments are applied to nominal shear capacities vn |
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Reference |
Notes under Sheathing Materials Table |
SDPWS Table 4.3A Notes, 4.3.7.1 , 4.3.3 |
increase 3/8, 7/16 to values for 15/32 for spacing >= 16" and horizontal orientation |
Note 3 |
Note 2 |
3” framing, staggered nails for certain conditions |
Note 2 |
4.3.7.1 (5) |
Specific Gravity (G) factor |
1 - ( 0.5 - G) |
1 - ( 0.5 - G) |
Note for specific gravity factor |
Note 1 |
Note 3: |
ASD Reduction Factor |
Incorporated into design values |
SDPWS 4.1.4 |
Wind design |
2.0 |
2.0 |
Seismic design |
2.8 |
2.8 |
Note for ASD Factor |
No note |
Note 1 referring to 4.1.4 |
Unblocked Factor* |
Shown in Shear Design Results table for each wall |
4.3.5.3, Table 4.3.5.3, Eqn. 4.3.2. |
Stud spacings, inches |
12, 16, 19.2, 24 |
12, 16, 20, 24 |
6" intermediate nail spacing |
1.0, 0.8, 0.6, 0.5 |
1.0, 0.8, 0.6,0.5 |
12" intermediate nail spacing |
0.8, 0.6, 0.5, 0.4 |
0.8, 0.6, 0.5, 0.4 |
*In addition to the factor, the shear capacity used is that for 6" edge spacing regardless of the nail spacing. |
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Hold-downs with 10d Nails** |
0.92 |
0.92 |
Note for 10d / Hold-down |
Note 7 |
Note 10 |
**Factor always applied on assumption that hold-downs are always required (doesn't take into account situations where dead load greater than shear uplift). Does not apply to walls with gypsum underlay, as note is not in Table 4.3B. |
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Perforated Wall Factor Co |
Refer to Shear Capacity Adjustment |
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Aspect Ratio Factor |
See section above this one |
See above section |
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Gypsum Underlay |
Allowed |
Table 4.3B |
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Combination of Sheathing Capacities |
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For more details, refer to Combination of Sheathing Capacities, |
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Reference |
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SDPWS 4.3.5.4, 4.3.5.4.2 Exception |
Identical materials on both sides |
Add capacities |
Add capacities |
With wood structural panels with different specs on other side, same blocking |
Vwc=Kmin Gac |
Vsc =Kmin Gac |
With non-wood-structural panels on other side, seismic |
Twice weakest or strongest |
Twice weakest or strongest |
Blocked WSP on one side, unblocked WSP on the other |
Twice weakest or strongest |
Twice weakest or strongest |
With lumber siding, fiberboard or lath/plaster on other side, wind |
Twice weakest or strongest |
Ttwice weakest or strongest |
With gypsum wallboard or gypsum sheathing board on other side, wind |
Add capacities |
Add capacities* |
Twice weakest or strongest: vn(c) = max ( 2 x min ( vn(1) ,vn(2)) , max( vn(1),vn(2) ) ) |
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*SDPWS refers only to gypsum wallboard (GWB), not gypsum sheathing board (GSB), but WoodWorks interprets the intention of the provision to include GSB |
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Combination of Apparent Stiffness Ga |
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For more details, refer to Combination of Sheathing Stiffness |
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Reference |
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SDPWS 4.3.5.4 |
Identical materials on both sides |
Add stiffnesses |
Add stiffnesses |
With wood structural panels with different specs on other side, same blocking |
Add stiffnesses |
Add stiffnesses |
With non-wood-structural panels on other side |
Twice side with weakest capacity or side with strongest cap. |
Twice side with weakest capacity or side with strongest |
With blocked WSP on one side and unblocked WSP on the other |
Twice side with weakest capacity or side with strongest cap. |
Twice side with weakest capacity or side with strongest |
Twice weakest capacity or side with strongest cap: Ga(c) = max (2 x Ga (min ( vn(1) ,vn(2))) , Ga (max( vn(1),vn(2) ))) |
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Bending Resistance |
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Reference |
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SDPWS Table 3.2.1 |
5/16” thickness |
Uses WFCM |
Not included |
All other sizes, spacings |
Uses SDPWS |
From Table 3.2.1 |
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Shear Capacity
Wood Structural Panels - Structural I |
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Shearwalls |
SDPWS Table 4.3A |
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Panel Thick. |
Nail Size |
Panel Edge Nail Spacing |
Panel Edge Nail Spacing |
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6 |
4 |
3 |
2 |
6 |
4 |
3 |
2 |
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Wind |
Seis |
Wind |
Seis |
Wind |
Seis |
Wind |
Seis |
Unfactored by ASD Factor |
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5/16 |
6d |
280 |
200 |
420 |
300 |
545 |
389.3 |
715 |
510.7 |
560 |
840 |
1090 |
1430 |
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3/8 |
8d |
322.5 |
230.4 |
505 |
360.7 |
645 |
460.7 |
855 |
610.7 |
645 |
1010 |
1290 |
1710 |
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7/16 |
8d |
357.5 |
255.4 |
552.5 |
394.6 |
707.5 |
505.4 |
937.5 |
669.6 |
715 |
1105 |
1415 |
1875 |
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15/32 |
8d |
392.5 |
280.4 |
602.5 |
430.4 |
770 |
550 |
1022.5 |
730.4 |
785 |
1205 |
1540 |
2045 |
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15/32 |
10d |
475 |
339.3 |
715 |
510.7 |
930 |
664.3 |
1217.5 |
869.6 |
950 |
1430 |
1860 |
2435 |
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Wood Structural Panels - Structural Sheathing |
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Shearwalls |
SDPWS Table 4.3A |
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Panel Thick. |
Nail Size |
Panel Edge Nail Spacing |
Panel Edge Nail Spacing |
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6 |
4 |
3 |
2 |
6 |
4 |
3 |
2 |
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Wind |
Seis |
Wind |
Seis |
Wind |
Seis |
Wind |
Seis |
Unfactored by ASD Factor |
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5/16 |
6d |
252.5 |
180.4 |
377.5 |
269.6 |
490 |
350 |
630 |
450 |
505 |
755 |
980 |
1260 |
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3/8 |
6d |
280 |
200 |
420 |
300 |
545 |
389.3 |
715 |
510.7 |
560 |
840 |
1090 |
1430 |
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3/8 |
8d |
307.5 |
219.6 |
447.5 |
319.6 |
575 |
410.7 |
742.5 |
530.4 |
615 |
895 |
1150 |
1485 |
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7/16 |
8d |
335 |
239.3 |
490 |
350 |
630 |
450 |
820 |
585.7 |
670 |
980 |
1260 |
1640 |
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15/32 |
8d |
365 |
260.7 |
532.5 |
380.4 |
685 |
489.3 |
895 |
639.3 |
730 |
1065 |
1370 |
1790 |
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15/32 |
10d |
435 |
310.7 |
645 |
460.7 |
840 |
600 |
1077.5 |
769.6 |
870 |
1290 |
1680 |
2155 |
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19/32 |
10d |
475 |
339.3 |
715 |
510.7 |
930 |
664.3 |
1217.5 |
869.6 |
950 |
1430 |
1860 |
2435 |
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Wood Structural Panels - Plywood Siding |
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Shearwalls |
SDPWS Table 4.3A |
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Panel Thick. |
Nail Size |
Panel Edge Nail Spacing |
Panel Edge Nail Spacing |
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6 |
4 |
3 |
2 |
6 |
4 |
3 |
2 |
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Wind |
Seis |
Wind |
Seis |
Wind |
Seis |
Wind |
Seis |
Unfactored by ASD Factor |
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5/16 |
6d |
195 |
139.3 |
295 |
210.7 |
385 |
275 |
505 |
360.7 |
390 |
590 |
770 |
1010 |
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3/8 |
8d |
225 |
160.7 |
335 |
239.3 |
435 |
310.7 |
575 |
410.7 |
450 |
670 |
870 |
1150 |