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  APA - The Engineered Wood Association   APA Residential & Commercial  

APA Residential & Commercial - Page 12

   

APA Residential & Commercial

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)



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