Wood-frame diaphragms
shall be designed and constructed in accordance with AWC
SDPWS. Where panels are fastened to framing members with
staples, requirements and limitations of AWC SDPWS shall
be met and the allowable shear values set forth in Table
2306.2(1) or 2306.2(2) shall be permitted. The allowable
shear values in Tables 2306.2(1) and 2306.2(2) are permitted
to be increased 40 percent for wind design.
TABLE 2306.2(1)
ALLOWABLE SHEAR VALUES (POUNDS PER FOOT) FOR WOOD STRUCTURAL PANELDIAPHRAGMS UTILIZING STAPLES
WITH FRAMING OF DOUGLAS FIR-LARCH, OR SOUTHERN PINE" FOR WIND OR SEISMIC LOADINGf
Fastener spacing (inches) at diaphragm boundaries (all cases) at continuous panel edges parallel to load (Cases 3, 4), and at all panel edges (Cases 5, 6)b
Fasteners spaced 6 max. at supported edgesb
6
4
21/2c
2c
Case 1 (No unblocked edges or continuous joints parallel to load)
All other configurations (Cases 2, 3, 4, 5 and 6)
Fastener spacing (inches) at other panel edges (Cases 1, 2, 3 and 4)b
Sheathing, single floor and other grades covered in DOC PS 1 and PS 2
11/2 16 gage
1
3/8
2
160
210
315
360
140
105
3
180
235
355
400
160
120
7/16
2
165
225
335
380
150
110
3
190
250
375
425
165
125
15/32
2
160
210
315
360
140
105
3
180
235
355
405
160
120
19/32
2
175
235
350
400
155
115
3
200
265
395
450
175
130
For SI: 1 inch = 25.4 mm, 1 pound per foot = 14.5939 N/m.
For framing of other species: (1) Find specific gravity for species of lumber in ANSI/AWC NOS. (2) For staples find shear value from table above for
Structural I panels (regard less of actual grade) and multiply value by 0.82 for species with specific gravity of 0.42 or greater, or 0.65 for all other species.
Space fasteners maximum 12 inches on center along intermediate framing members (6 inches on center where supports are spaced 48 inches on center).
Framing at adjoining panel edges shall be 3 inches nominal or wider.
Staples shall have a minimum crown width of 7/16 inch and shall be installed with their crowns parallel to the long dimension of the framing members.
The minimum nominal width of framing members not located at boundaries or adjoining panel edges shall be 2 inches.
For shear loads of normal or permanent load duration as defined by the ANSI/AWC NDS, the values in the table above shall be multiplied by 0.63 or 0.56,
respectively.
TABLE 2306.2(2)
ALLOWABLE SHEAR VALUES (POUNDS PER FOOT) FOR WOOD STRUCTURAL PANEL BLOCKED DIAPHRAGMS
UTILIZING MULTIPLE ROWS OF STAPLES (HIGH-LOAD DIAPHRAGMS) WITH FRAMING OF
DOUGLAS FIR-LARCH OR SOUTHERN PINE" FOR WIND OR SEISMIC LOADINGb,g,h
Sheathing single floor and other grades covered in DOC PS 1 and PS 2
14 gage staples
2
15/32
3
2
540
540
735
865
915
1,080
4
3
735
810
1,005
1,105
1,105
1,195
19/32
3
2
600
600
865
960
1,065
1,200
4
3
865
900
1,130
1,430
1,370
1,485
23/32
4
3
865
900
1,130
1,490
1,430
1,545
For SI: 1 inch = 25.4 mm, 1 pound per foot = 14.5939 N/m.
For framing of other species: (1) Find specific gravity for species of framing lumber in ANSI/ AWC NDS. (2) For staples, find shear value from table above
for Structural I panels (regardless of actual grade) and multiply value by 0.82 for species with specific gravity of 0.42 or greater, or 0.65 for all other species.
Fastening along intermediate framing members: Space fasteners a maximum of 12 inches on center, except 6 inches on center for spans greater than 32
inches
This table gives shear values for Cases l and 2 as shown in Table 2306.2(1). The values shown are applicable to Cases 3, 4, 5 and 6 as shown in Table
2306.2(1), providing fasteners at all continuous panel edges are spaced in accordance with the boundary fastener spacing.
The minimum nominal depth of framing members shall be 3 inches nominal. The minimum nominal width of framing members not located at boundaries or
adjoining panel edges shall be 2 inches.
Staples shall have a minimum crown width of 7/16 inch, and shall be installed with their crowns parallel to the long dimension of the framing members.
For shear loads of normal or permanent load duration as defined by the ANSI/AWC NDS, the values in the table above shall be multiplied by 0.63 or 0.56,
respectively
Gypsum board and gypsum panel products shall be permitted
on wood joists to create a horizontal diaphragm in
accordance with Table R702.3.6. Gypsum ...