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
46
TABLE 20
APA RATED LAP SIDING APPLIED DIRECT-TO-STUDS OR OVER NONSTRUCTURAL SHEATHING
(a)(b)(c)(d)(e)
Minimum Nail
(f)
Minimum
Performance
Category (in.)
Wall Stud
Spacing
(in. o.c.)
Lap Siding
Width (in.)
Maximum Wind Speed (mph)
Shank Diameter
(in.)
Penetration in
Framing (in.)
Wind Exposure Category
B C D
0.113 1.5
3/8 16
6 140 120 110
8 140 120 110
12 120 100 90
7/16 16
6 140 120 110
8 140 120 110
12 120 100 90
7/16 24
6 140 120 110
8 120 100 90
12 90 NP NP
(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) APA Rated lap siding rated 16 oc and 24 oc shall be used with
a maximum stud spacing of 16" o.c. and 24" o.c., respectively.
(d) Hot-dip galvanized nails are recommended for most siding applica-
tions, see Siding Fasteners section of page 48 for more information.
(e) 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.
(f) See Table 5, page 14, for nail dimensions.
TABLE 21B
APA RATED SIDING (PANEL) APPLIED TO STRUCTURAL SHEATHING
(a)(b)(c)(d)(e)
APA Rated
Panel Siding
Minimum Nail
(f)(g)
Wall Stud
Spacing
(in. o.c.)
Panel Nail Spacing Maximum Wind Speed (mph)
Shank Diameter
(in.)
Edges
(h)
(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 or 24 oc
0.120 ring shank
16 6
12 110
90 85
6 125 105 90
24 6
12
90 NP NP
6 110 90 85
(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 fas-
tener spacing of 6" o.c. at panel edges and 12" o.c. at intermediate
supports shall be sufficient.
(d) Hot-dip galvanized nails are recommended for most siding applica-
tions, see Siding Fasteners section on page 48 for more information.
(e) Maximum stud spacing shall be in accordance with Table 21A.
(f) Ring shank nail shall be used.
(g) See Table 5, page 14, for nail dimensions.
(h) 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.
TABLE 21A
MAXIMUM STUD SPACING: APA RATED SIDING (PANEL) APPLIED DIRECT-TO-STUDS OR STRUCTURAL SHEATHING
Siding Description
Minimum Performance
Category or
Span Rating
Maximum Stud Spacing (in.) for Vertical Rows of Nails
Parallel to Supports Perpendicular to Supports
APA MDO GENERAL
3/8 16 24
15/32 24 24
APA Rated Siding
16 oc 16 16
(a)
24 oc 24 24
(a) Stud spacing may be 24" o.c. for veneer-faced siding panels.