| Apply building paper over panel wall
sheathing for stucco exterior wall finish, or when required for brick veneer or other
exterior wall finishes in accordance with local building or energy code or when indicated
by the manufacturer of the sheathing or exterior wall finish.(6) E. Treated Plywood
1. Fire-retardant-treated plywood-
All plywood shall pressure-treated in accordance with
American wood-Preservers' Association standard AWPA C27 with an approved (low hygroscopic,
high temperature Interior Type A-HT) (Exterior Type) fire retardant. Each panel shall be
labeled or marked by an approved independent testing agency. after treatment,s plywood
shall be dried to an average moisture content of 15 percent or less.
Plywood shall be all-veneer APA RATED SHEATHING (or better,
depending on appearance desired)EXP 1 or EXT.
Note: Span Ratings and load capacities are based on
untreated panels, and may not apply following fire-retardant treatment (FRT).Obtain
structural performance characteristics of FRT panels from the company providing the
treatment and redrying service.
2. Preservative-treated plywood-
Treated plywood for (state application shall be
pressure-treated in accordance with AWPA C9 with (creosote)
(pentachlorophenol)(waterborne) preservatives, as required for (coastal water)(wood
foundation)(ground contact) (above ground) exposures. Plywood treated with waterborne
preservatives shall be dried after treatment to a moisture content of 18 percent or less.
All treated plywood used in the Permanent Wood Foundation
system (PWF) shall be marked by an approved inspection agency certified to inspect
preservative-treated wood, indicating compliance with the treating, drying retention and
penetrating requirements of AWPA Standard C22, or equivalent code-approved
preservative-treating and quality control requirements.
Plywood shall be all-veneer APA RAT4ED SHEATHING (or
better, depending on appearance desired )EXP 1, marked APA Series V-600, or EXT, marked
APA Series V-611.
F. Glued Plywood Components
1. General - All plywood
components shall be fabricated in accordance with the appropriate APA Fabrication
Specification.(18) Each original plywood panel shall bear the appropriate
trademark of APA. Glue shall be of resorcinol of phonemic resin base (for outdoor
exposure), or casein with a mold inhibitor (for indoor exposure).
| Notes to Specifiers (Continued): (13) Specify veneer-faced STURD-I-FLOOR with "sanded face"
when resilient flooring is to be applied (or see Footnote 16 for additional grades).
Otherwise, an additional layer of "sanded face" underlayment is recommended when
resilient flooring is to be applied over STURD-I-FLOOR.
(14) This step may not be necessary under some carpet and
structural flooring products - check with flooring manufacturer.
(15) Major model building codes accept 12" spacing
with glue but some local codes may require closer spacing at edges. When panels greater
than 3/4" thick are used in glued floors, use same fastener schedule as for
nailed-only construction.
(16) For areas to be covered with resilient flooring or
fully adhered carpeting. specify Underlayment or C-C Plugged panel grades marked
"sanded face." Underlayment A-C , Underlayment B-C, Marine EXT or sanded plywood
grades marked "Plugged Crossbands Under Face," "Plugged Crossbands(or
Core),"Plugged Inner Plies" or "Meets Underlayment Requirements" may
also be used under resilient flooring or fully adhered carpeting.
(17) For 1/4"-thick panels, nail 3" o.c. along
panel edges and 6" o.c. each way throughout remainder of panel, with 3d
ring-shank nails.
(18) Design and fabrication specifications for plywood box
beams, stressed-skin panels, curved panels, sandwich panels and all-plywood beams are
available from APA.
(Continued on Page 17) |
|
