Georgia-Pacific APA Engineered Wood Construction Guide - Walls User Manual
Page 15
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
56
Finishing
APA RATED SIDING may be finished
with a variety of products such as semi-
transparent stains, solid-color stains or
paint systems. The recommended finishes
depend on the type of siding product, and
whether it has an overlaid surface.
Oil-based, semitransparent stains may be
used on certain veneer-faced siding prod-
ucts as detailed in Table 27. Solid-color
stains may be used on most APA RATED
SIDING products and usually provide
better protection. In general, however,
best overall performance on APA RATED
SIDING products can be achieved with an
all-acrylic latex paint system.
For overlaid siding, any top-quality exte-
rior house paint system formulated for
wood performs satisfactorily. Solid-
color stains may also be used on overlaid
sidings, although some manufacturers rec-
ommend only acrylic latex formu lations.
For specific recommendations on fin-
ishing OSB siding products, consult the
siding manufacturer.
Table 27 provides a summary of finish ing
recommendations for APA 303 Siding face grades. For complete information, refer to
.
Semitransparent Stains (oil-based only)
Oil-based semitransparent stains empha size grain patterns, texture and natural characteristics in the wood. They may
be used on plywood face grades 303-OC, 303-NR and 303-6-W. It is the only finish recommended for use over brushed
plywood. Other 303 face grades should not be finished with semi transparent stains unless specifically recommended
by the panel manufacturer.
Solid-Color Stains (oil or all-acrylic latex)
An opaque or solid-color stain obscures color differences in the wood and between repairs and surrounding wood.
This is often a satisfactory finishing system, therefore, where semitransparent stains are unsuitable. Wood grain is also
muted with solid-color stains but wood surface textures usually remain evident. When in question, the finish should
be applied to a representative sample in order to demonstrate the finished appearance.
Solid-color stains are particularly recommended for grades 303-6-S and 303-6-S/W, as well as 303-18 and 303-30 with
any type of patch.
TABLE 27
APA 303 SIDING FINISHING RECOMMENDATIONS
PAINTS
Minimum 1
303 Series
STAINS
primer plus 1
Plywood Siding Semitransparent
Solid Color
topcoat
Grades
(oil)
(oil or latex)
(a)
(acrylic latex)
303-OC
(b)
(b)
(b)
303-OL
Not Recommended
(d)
(b)
303-NR
(b)
(e)
(e)
303-SR
(c)
(e)
(e)
303-6-W
(b)
(b)
(b)
303-6-S
(c)
(b)
(b)
303-6-S/W
(c)
(b)
(b)
303-18-W
(c)
(b)
(b)
303-18-S
(c)
(b)
(b)
303-18-S/W
(c)
(b)
(b)
303-30-W
(c)
(b)
(b)
303-30-S
(c)
(b)
(b)
303-30-S/W
(c)
(b)
(b)
(a) Except for overlaid panels, use a stain-
resistant primer with light-colored latex
stains, since the wood extractives may
cause a discoloration of the finish.
(b) Recommended with provisions given
in text.
(c) Should not be finished with semitrans-
parent stain unless specifically recom-
mended by the panel manufacturer.
(d) Some panel manufacturers recom-
mend only acrylic latex formulations.
Consult the manufacturer’s
recommendations.
(e) Only acrylic latex formulations are
recommended when solid-color stains
or paint systems are applied over
open voids.