| TABLE 32 |
| RECOMMENDED SHEAR
(POUNDS PER FOOT) FOR HORIZONTAL APA PANEL DIAPHRAGSM WITH FRAMING OF DOUGLAS-FIR, LARCH
OR SOUTHERN PINE(a) FOR WIND OR SEISMIC LOADING |
| Panel Grade |
Common Nail Space |
Minimum Nail Penetration in Framing(f) (inches) |
Minimum Nominal Panel in Thickness (inches) |
Minimum Nominal Width of Framing Member (inches) |
Blocked Diaphragms |
Unblocked Diaphragms |
| Nail Spacing (in.) at
diaphragm boundaries (all cases), at continuous panel edges parallel to load (Cases 3
& 4), and at all panel edges (Cases 5 & 6)(b) |
Nail Spacing 6" max.
at Supported Edges(b) |
| 6 |
4 |
2-1/2(c) |
2(c) |
Case 1 (No unblocked edges or
continuous joints parallel to load) |
All other configurations (Cases
2,3,4,5&6) |
| Nail Spacing (in.) at
other panel edges (Cases 1,2,3&4)(b) |
|
|
| |
|
|
|
|
6 |
6 |
4 |
3 |
|
|
| APA STRUCTURAL I grades |
6d(e) |
1-1/4 |
5-16 |
2
3 |
185 210 |
250 280 |
375 420 |
420 475 |
165
185 |
125
140 |
| 8d |
1-1/2 |
3/8 |
2
3 |
270 300 |
360 400 |
530 600 |
600 675 |
240
265 |
180
200 |
| 10(d) |
1-5/8 |
15/32 |
2
3 |
320 360 |
425 480 |
640 720 |
730 820 |
285
320 |
215
240 |
| APA RATED SHEATHING APA RATED
STURD-I-FLOOR and other APA grades except Species Group 5 |
6d(e) |
1-1/4 |
5/16 |
2
3 |
170 190 |
225 250 |
335 380 |
380 430 |
150
170 |
110
125 |
| 3/8 |
2
3 |
185 210 |
250 280 |
375 420 |
420 475 |
165
185 |
125
140 |
| 8d |
1-1/2 |
3/8 |
2
3 |
240 270 |
320 360 |
480 540 |
545 610 |
215
240 |
160
180 |
| 7/16 |
2
3 |
255 285 |
340 380 |
505 570 |
575 645 |
230
255 |
170
190 |
| 15/32 |
2
3 |
270 300 |
360 400 |
530 600 |
600 675 |
240
265 |
180
200 |
| |
10d(d) |
1-5/8 |
15/32 |
2
3 |
290 325 |
385 430 |
575 650 |
655 735 |
255
290 |
190
215 |
| |
19/32 |
2
3 |
320 360 |
425 480 |
640 720 |
730 720 |
285
320 |
215
240 |
(a) For framing of other species:(a) Find specific gravity
for specific of lumber in AFPA National Design Specification.(2) Find shear value from
table above for nail size for structural I panels (regardless of actual grade). (3)
Multiply value by 0.82 for species with specific gravity of 0.42 or greater, or 0.65 for
all other species. See footnote(f).
(b) Space nails maximum 12 inches o.c. along intermediate
framing members (6 in. o.c. when supports are space 48 in.o.c. or greater.). Fasteners
shall be located a minimum 3/8 inch from panel edges.
(c) Framing at adjoining panel edges shall be 3-in. nominal
or wider, and nails shall be staggered where nails are space 2 inches o.c. or 2-1/2 inches
o.c.
(d) Framing at adjoining panel edges shall be 3-in. nominal
or wider, and nails shall be staggered where 10d nails having penetration into
framing of more than 1-5/8 inches are spaced 3 inches o.c.
(e) 8d is recommended minimum for roofs due to negative
pressures of high winds
(f) Contact APA for engineered alternative.
Notes: Design for diaphragm stresses
depends on direction of continuous panel joints with reference to load, not on direction
of long dimension of sheet. Continuos framing may being either direction for blocked
diaphragms.
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