Interior paneling – Georgia-Pacific APA Engineered Wood Construction Guide - Walls User Manual
Page 16
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
57
Paints (all-acrylic latex)
Top-quality acrylic latex house paint systems are recommended for all APA Rated Sidings, except brushed plywood. If
house paint is used on plywood siding, an all-acrylic latex paint system consisting of at least one stain-blocking prime
coat and an all-acrylic latex topcoat is recom mended. For extractive staining woods, some house paint systems uti-
lize an oil-alkyd primer. Others use up to two coats of a stain-blocking acrylic latex primer. These latter systems help
to reduce face-checking and generally offer superior performance. A paint finish tends to mask the textured plywood
surface more than either semi transparent or solid-color stains. On the other hand, a top-quality acrylic latex paint sys-
tem provides the most durable finish.
Grade 303-OL may be finished with any top-quality exterior paint system – primer and companion topcoat – formu-
lated for wood.
Field Application of Finish
Proper surface preparation is important for good performance of finishes on any surface. Remove dirt and loose wood
fibers with a stiff nonmetallic bristle brush. Mildew may be removed with a solution of 1/4 part household bleach to 3/4
part warm water. Be sure to rinse thoroughly after application of bleach.
Finishes should be applied as soon as possible after installation of the siding. Weathering of unprotected wood can
cause surface damage in as little as two to four weeks. Apply finishes during favorable weather conditions. As a rule of
thumb, finishes should not be applied when the outside air temperature is expected to drop below 50° F (10° C) within
24 hours for latex finishes, or 40° F (5° C) for oil-based finishes. However, recommendations of individual manufactur-
ers may vary and should always be followed. Wood surfaces should be clean and dry, although extremely dry surfaces
should be dampened slightly when applying latex finishes.
Use only top-quality finishes and application equipment. Finishes should be applied according to the spread rates recom-
mended by the manufacturer. Textured surfaces may require up to twice as much finish as smooth surfaces. The first coat
should be applied by brush. If spray equipment is used to apply the finish, then the finish should be either back-brushed or
back-rolled while it is still wet. Subsequent coats of finish may be applied by any conventional means.
Interior Paneling
APA Rated Siding panels lend themselves to a number of decorative surface treat ments for attractive interior paneling
and accent walls. (
.) Such treatments include saw-textured, brushed, embossed and grooved. Let
APA panels acclimatize to room temperature and humidity conditions for several days prior to attachment to the wall.
This can be accomplished by placing the panels on edge with space between each panel to allow air to circulate freely
over both sides. Preservative treatment of furring or studs is recommended when they are attached to masonry or con-
crete exterior walls and to any uncured concrete wall. Also, in these instances, install a 4-mil polyethylene vapor retarder
between the paneling and the furring or studs and insulated exterior walls. Support and nail spacing recommendations
are given in Table 28. Recommendations apply to all species groups.
TABLE 28
INTERIOR PANELING
Panel
Nail Size
Maximum Nail Spacing (in.)
Performance
Maximum Support
(Use casing or
Intermediate
Category
Spacing (in.)
finishing nails)
(c)
Panel Edges
Supports
1/4
16
(a)
4d
6
12
5/16
16
(b)
6d
6
12
11/32 - 1/2
24
6d
6
12
19/32 - 3/4
24
8d
6
12
Texture 1-11
24
8d
6
12
(a) Can be 20 inches if strength axis of paneling is across supports.
(b) Can be 24 inches if strength axis of paneling is across supports.
(c) See
Table 5, page 14
, for nail dimensions.