Georgia-Pacific APA Engineered Wood Construction Guide - Walls User Manual
Page 6
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
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A single layer of wood structural panel siding, since it is strong and rack resistant, eliminates the cost of installing separate
structural sheathing or diagonal wall bracing. Panel sidings are normally installed vertically, but may also be placed hori-
zontally (long dimension across supports) if horizontal joints are blocked. Maximum stud spacings for both applications are
given in Tables
,
20 and 21
.
When installing panel or lap siding over rigid foam insulation sheathing, drive the nails flush with the siding surface,
but avoid over-driving, which can result in dimpling of the siding due to the compressible nature of foam sheathing.
Sidings are occasionally treated with water repellents or wood preservatives to improve finishing characteristics or mois-
ture resistance for certain applications. If the siding has been treated, allowing the surface treatment to dry will avoid
solvent or chemical reaction with the foam sheathing.
When rigid foam insulation sheathing is used, building codes also generally require installation of 1/2-inch gypsum wallboard,
or other materials of the required thermal barrier rating, on the inside surface of the wall for fire protection.
See Figures 8 through 12 for panel and lap siding installation recommendations for the Sturd-I-Wall system or for siding
installed over nailable sheathing. See
, for additional recommended details to
avoid moisture penetration in walls.
All panel siding edges in Sturd-I-Wall construction should be backed with framing or blocking. Use nonstaining, non-
corrosive nails as described in Tables
,
20 and 21
to prevent staining the siding.
Where siding is to be applied at an angle, install only over wood structural panel sheathing.
Note: Gluing of siding to framing is not recommended due to the increased potential for panel buckling.
Panel siding meets code
requirements for wall bracing
1/8" spacing is recommended
at all edge and end joints unless
otherwise indicated by panel manufacturer
Building paper or code-
recognized weather-resistive
barrier required behind siding
APA RATED SIDING panels.
All edges supported by framing
or blocking.
FIGURE 8
APA STURD-I-WALL (Vertical Panel Installation)
6" minimum clearance,
siding to grade