Installation Guide

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
45
WALL CONSTRUCTION
Building codes require that walls resist wind pressures caused by the design wind speeds, resist wall-racking forces
and provide weather protection. This section provides details on how wood structural panels can be used to meet these
fundamental requirements.
APA Sturd-I-Wall
®
The APA Sturd-I-Wall system consists of APA RATED SIDING (panel or lap) applied direct to studs or over nonstruc-
tural fiberboard, gypsum or rigid foam insulation sheathing*. Nonstructural sheathing is defined as sheathing not
recognized by building codes for meeting both bending and racking strength requirements.
TABLE 19
FASTENING APA RATED SIDING (PANEL) APPLIED DIRECT-TO-STUDS OR OVER NONSTRUCTURAL
SHEATHING
(a)(b)(c)(d)(e)
APA Rated
Panel Siding
Minimum Nail
(f)
Wall Stud
Spacing
(in. o.c.)
Panel Nail Spacing Maximum Wind Speed (mph)
Shank
Diameter
(in.)
Penetration
in Framing
(in.)
Edges
(g)
(in. o.c.)
Intermediate
Supports
(in. o.c.)
Wind Exposure Category
B C D
3/8 Performance
Category
APA MDO
GENERAL
APA Rated Siding
16 oc
APA Rated Siding
24 oc
0.113
1.5
16 6
12 110 90 90
6 140 120 110
24 6
12 90
NP NP
6 130 110 100
2.0
16 6
12 125 105 90
6 140 120 110
24 6
12 100 85
NP
6 140 120 110
(a) Table is based on wind pressures acting toward and away from
building surfaces, at 30-ft height in wall Zone 5 (corners) with
smallest effective area, per Section 6.4.2.2 of ASCE 7-05 and
Section R301.2 of the 2009 IRC. Stud specific gravity = 0.42.
(b) Recommendations of siding manufacturer may vary.
(c) For use as wood structural panel wall bracing, the minimum
fastener spacing of 6" o.c. at panel edges and 12" o.c. at interme-
diate supports shall be sufficient except:
(1) For braced wall section with Performance Category 3/8 panel
siding applied horizontally over studs 24" o.c., space nails
3" o.c. along panel edges.
(d) Hot-dip galvanized nails are recommended for most siding
applications, see Siding Fasteners section on page 48 for more
information.
(e) Maximum stud spacing shall be in accordance with Table 21A.
(f) See Table 5, page 14, for nail dimensions.
(g) Supported panel joints shall occur approximately along the center-
line of framing with a minimum bearing of 1/2". Fasteners shall
be located 3/8" from panel edges. Siding installed over two or
more spans.
* Where panel siding is applied over foam sheathing, see APA publication APA Rated Siding Panels over Rigid Foam Insulation Sheathing, Form C465.