How to Guide

Wall Construction
ENGINEERED WOOD CONSTRUCTION GUIDE
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FORM NO. B360P
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© 2011 APA – THE ENGINEERED WOOD ASSOCIATION
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WWW.APAWOOD.ORG
59
Load
Framing
Blocking
Framing
Typical Layout for Shear Walls
Shear wall boundary
TABLE 29
ALLOWABLE SHEAR (POUNDS PER FOOT) FOR APA PANEL SHEAR WALLS WITH FRAMING OF DOUGLAS-FIR,
LARCH, OR SOUTHERN PINE
(a)
FOR WIND
(b)(c)(d)(e)(f)
OR SEISMIC
(c)(d)(e)(g)
LOADING
Panel Grade
Minimum
Nominal
Panel
Thickness
(in.)
Minimum
Nail
Penetration
in Framing
(in.)
Panels Applied Direct to Framing
Panels Applied Over 1/2" or 5/8"
Gypsum Sheathing
Nail Size
(common or
galvanized
box)
(h)
Nail Spacing at
Panel Edges (in.)
Nail Size
(common or
galvanized
box)
Nail Spacing at
Panel Edges (in.)
6 4 3 2
(i)
6 4 3 2
(i)
APA
STRUCTURAL I
grades
3/8
1-3/8 8d
230
(j)
360
(j)
460
(j)
610
(j)
10d 280 430 550
(l)
7307/16 255
(j)
395
(j)
505
(j)
670
(j)
15/32 280 430 550 730
15/32 1-1/2 10d 340 510 665
(l)
870 — — — —
APA RATED
SHEATHING; APA
RATED SIDING
(m)
and other APA
grades except
species Group 5
5/16 or 1/4
(k)
1-1/4 6d
180 270 350 450
8d
180 270 350 450
3/8 200 300 390 510 200 300 390 510
3/8
1-3/8 8d
220
(j)
320
(j)
410
(j)
530
(j)
10d 260 380 490
(l)
6407/16 240
(j)
350
(j)
450
(j)
585
(j)
15/32 260 380 490 640
15/32
1-1/2 10d
310 460 600
(l)
770 — — — — —
19/32 340 510 665
(l)
870 — — — — —
APA RATED
SIDING
(m)
and
other APA grades
except species
Group 5
Nail Size
(galvanized
casing)
Nail Size
(galvanized
casing)
5/16
(k)
1-1/4 6d 140 210 275 360 8d 140 210 275 360
3/8 1-3/8 8d 160 240 310 410 10d 160 240 310
(l)
410
(a) For framing of other species: (1) Find specific gravity for species of
lumber in the AF&PA National Design Specification (NDS). (2) For
common or galvanized box nails, find shear value from table above
for nail size for actual grade. (3) Multiply value by the following adjust-
ment factor: Specific Gravity Adjustment Factor = [1 – (0.5 – SG)],
where SG = specific gravity of the framing. This adjustment shall not
be greater than 1.
(b) For wind load applications, the values in the table above shall be
permitted to be multiplied by 1.4.
(c) All panel edges backed with 2-inch nominal or wider framing. Install
panels either horizontally or vertically. Space nails maximum 6 inches
o.c. along intermediate framing members for 3/8-inch and 7/16-inch
panels installed on studs spaced 24 inches o.c. For other conditions and
panel thicknesses, space nails maximum 12 inches o.c. on intermediate
supports. Fasteners shall be located 3/8 inch from panel edges.
(d) Where panels applied on both faces of a wall and nail spacing is less
than 6 inches o.c. on either side, panel joints shall be offset to fall on dif-
ferent framing members, or framing shall be 3-inch nominal or thicker
at adjoining panel edges and nails on each side shall be staggered.
(e) Galvanized nails shall be hot-dip or tumbled.
(f) For shear loads of normal or permanent load duration as defined by
the AF&PA NDS, the values in the table above shall be multiplied by
0.63 or 0.56 respectively.
(g) In Seismic Design Category D, E, or F, where shear design values
exceed 350 pounds per lineal foot, all framing members receiving
edge nailing from abutting panel edges shall not be less than a single
3-inch nominal member, or two 2-inch nominal members
fastened together to transfer the design shear value between
framing members. Wood structural panel joint and sill plate
nailing shall be staggered in all cases. See IBC or AF&PA
Special Design Provisions for Wind and Seismic (SDPWS) for sill
plate size and anchorage requirements.
(h) See Table 5, page 14, for nail dimensions.
(i) Framing at adjoining panel edges shall be 3-inch nominal or
wider, and nails shall be staggered where nails are spaced 2
inches o.c. Check local code for variations of these requirements.
(j) Allowable shear values are permitted to be increased to values
shown for 15/32-inch sheathing with same nailing provided
(1) studs are spaced a maximum of 16 inches on center, or
(2) panels are applied with long dimension across studs.
(k) 3/8-inch or APA RATED SIDING 16 oc is minimum recom-
mended when applied direct to framing as exterior siding.
(l) Framing at adjoining panel edges shall be 3-inch nominal
or wider, and nails shall be staggered where 10d nails (3" x
0.148") having penetration into framing of more than 1-1/2
inches are spaced 3 inches o.c. Check local code for variations
of these requirements.
(m) Values apply to all-veneer plywood APA RATED SIDING panels
only. Other APA RATED SIDING panels may also qualify on a
proprietary basis. APA RATED SIDING 16 oc plywood may be
11/32 inch, 3/8 inch or thicker. Thickness at point of nailing on
panel edges governs shear values.