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APA The Engineered Association

PRODUCT GUIDE

GRADES AND SPECIFICATIONS CONTENTS INTRODUCTION

Introduction ...... 3 This guide to APA – The

Key Definitions ...... 4 Association panel grades and specifications is APA Trademark...... 4 meant to serve as a useful reference source for Product Standard PS 1-83 ...... 4 APA Performance Standards ...... 5 structural wood panel users, specifiers, Grade ...... 5 Exposure Durability ...... 5 dealers and distributors. It contains key Species Group Number...... 7 information about the many structural wood Span Ratings ...... 7 panel grades produced by APA member mills, APA Performance Rated Panels...... 9 including APA Performance Rated Panels, APA Rated ...... 11-13 sanded , and specialty grades.

APA Sanded and Touch-sanded Plywood ...... 14-15 It illustrates and explains APA trademarks.

APA Specialty Grades...... 16 It provides a comprehensive guide to

Guide to Specifications ...... 17-20 architectural specifications. And it contains panel installation recommendations for Storage and Handling...... 21 typical construction applications. Installation ...... 21-22 For complete panel application Method of Ordering...... 23 recommendations or additional product

Grade Availability...... 23 information, consult any of the other APA

Additional Information...... 23 publications cited throughout this brochure.

Or for additional specification or design About APA ...... 24 assistance, contact the nearest APA regional

field office listed on the back cover.

APA trademarked structural wood panels.

For the very best in versatility, durability and

quality…in hundreds of construction,

industrial and do-it-yourself applications. APA – The Enginnered Wood Association ©1995 KEY DEFINITIONS

APA TRADEMARK U.S. PRODUCT Panels conforming to the product The APA – The Engineered Wood STANDARD PS 1-83 standard carry the notation “PS 1-83” in Association’s trademarks appear only on U.S. Product Standard PS 1-83 for the lower portion of the APA trademark. products manufactured by APA member Construction and Industrial Plywood is a For a complete copy of U.S. Product mills. The marks signify that the voluntary commodity standard developed Standard PS 1-83 for Construction and manufacturer is committed to APA’s cooperatively by the U.S. Department of Industrial Plywood, Form H850, write the rigorous program of quality inspection Commerce and the construction and APA – The Engineered Wood Association. and testing and that panel quality is industrial plywood industry. PS 1-83 subject to verification through APA audit establishes requirements for producing, – a procedure designed to assure marketing and specifying construction and manufacture in conformance with APA industrial plywood. With the exception of performance standards and/or U.S. Plyron and some APA Performance Rated Product Standard PS 1-83 for Construction Panels, all of the other plywood and Industrial Plywood. grades described in this guide Unsanded and touch-sanded panels, are produced under the and panels with “B” or better veneer on provisions of U.S. Product one side only, usually carry the APA trade- Standard PS 1-83. mark on the panel back. Panels with both sides of “B” or better veneer, or with special overlaid surfaces (such as Medium Density Overlay), carry the APA trademark on the panel edge.

3 TYPICAL APA APA PERFORMANCE of veneer permitted in Exterior plywood is TRADEMARKS STANDARDS “C.” “D” veneer is used only in panels APA performance standards are the result intended for interior use or for of manufacturing technology that makes applications protected from permanent possible the manufacture of structural exposure to the weather. Panel panel products from wood by-products grade APA Span RATED STURD-I- and species not provided for in U.S. EXPOSURE DURABILITY Rating 23/32 INCH Thickness 24 oc Product Standard PS 1-83. APA perfor- APA trademarked panels may be Tongue- SIZED FOR SPACING and- T&G NET WIDTH 47-1/2 mance standards deal exclusively with produced in four exposure durability EXPOSURE 1 Exposure how a product must perform in a desig- classifications – Exterior, Exposure 1, durability 000 Mill classification PS 1-83 UNDERLAYMENT number nated application rather than from what or Exposure 2, and Interior. The exposure PRP-108 Product how the product must be manufactured. durability classification relates to glue Standard Panels produced under APA performance bond, and thus to structural integrity. standards – called APA Performance Rated Since aesthetic (non-structural) attributes Panels – must meet several performance Panel of panels may be compromised to some grade APA baseline requirements according to the degree by exposure to weather(2), RATED SHEATHING Span panel’s designated end use. These perfor- Rating 15/32 INCH Thickness installation recommendations in this 32/16 mance requirements include uniform and publication are designed to provide SIZED FOR SPACING Exposure EXPOSURE 1 concentrated static and impact load optimum overall performance. durability Mill classification 000 capacity, fastener-holding ability, racking Exterior panels have a fully PRP-108 number HUD-UM-40C resistance, dimensional stability, and waterproof bond and are designed for APA’s Performance-Rated bond durability. applications subject to permanent Panel Standard In addition to conventional veneer exposure to the weather or to moisture. plywood, APA performance standards encompass such other panel products as Panel APA APA APA Siding grade RATED SHEATHING RATED SIDING face grade composites and . 303-18-S/W 48/24 23/32 INCH A-C GROUP 1 Span Thickness Rating 11/32 INCH (See APA Performance Rated Panels, SIZED FOR SPACING 24 oc GROUP 1 Species page 8.) EXTERIOR EXTERIOR SIZED FOR SPACING group 000 000 Exposure EXTERIOR number PS 1-83 C-C durability For complete performance testing and PRP-108 PS 1-83 Mill classification 000 PS 1-83 FHA-UM-64 number qualification information, write APA for PRP-108 HUD/FHA PRP-108, Performance Standards and recognition Exposure 1 panels have a fully Product Standard Policies for Structural-Use Panels, water-proof bond and are designed for Form E445. applications where long construction

Exposure delays may be expected prior to providing GRADE Face durability protection, or where high moisture veneer classification The term “grade” may refer to panel grade conditions may be encountered in service. or to veneer grade. Panel grades are gen- A-B • G-1 • EXPOSURE 1-APA • 000 • PS1-83 Exposure 1 panels are made with the same erally identified in terms of the veneer exterior used in Exterior panels. Back Species Mill Product grade used on the face and back of the veneer group number Standard However, because other compositional number panel (e.g., A-B, B-C, etc.), or by a name factors may affect bond performance, only suggesting the panel’s intended end Exterior panels should be used for use (e.g., APA Rated Sheathing, permanent exposure to the weather.(3) Underlayment, etc.). Veneer grades define veneer appearance in terms of natural unrepaired growth APA APA RATED SHEATHING 15/32 INCH characteristics and allowable number and 32/16 A-D GROUP 1 SIZED FOR SPACING size of repairs that may be made during EXPOSURE 1 EXPOSURE 1 manufacture. The highest quality veneer is 000 000 PRP-108 PS 1-83 “A,”(1) the lowest “D.” The minimum grade HUD-UM-40C

4 VENEER GRADES

Smooth, paintable. Not more than 18 neatly made repairs, boat, sled, or type, and parallel to grain, permitted. A Wood or synthetic repairs permitted. May be used for natural finish in less demanding applications.

Solid surface. Shims, sled or router repairs, and tight knots to 1 inch across grain permitted. Wood or synthetic repairs B permitted. Some minor splits permitted.

Improved C veneer with splits limited to 1/8 inch width and knotholes or other open defects limited to 1/4 x 1/2 inch. C Admits some broken grain. Wood or synthetic repairs Plugged permitted.

Tight knots to 1-1/2 inch. Knotholes to 1 inch across grain and some to 1-1/2 inch if total width of knots and knotholes is within specified limits. Synthetic or wood repairs. Discoloration C and sanding defects that do not impair strength permitted. Limited splits allowed. Stitching permitted.

Knots and knotholes to 2-1/2 inch width across grain and 1/2 inch larger within specified limits. Limited splits allowed. D Stitching permitted. Limited to Interior, Exposure 1 and Exposure 2 panels.

NOTE: All-veneer APA Rated Sheathing durability classifications in applications Exposure 2 panels (identified as Exposure 1, commonly called “CDX” in the requiring fire-retardant-treated or Interior type with intermediate glue trade, is frequently mistaken as an Exterior preservative-treated plywood. under PS 1) are intended for protected panel and erroneously used in applications construction applications where only (1) Some manufacturers also produce a premium for which it does not possess the required “N” grade (natural finish) veneer, available only on moderate delays in providing protection resistance to weather. “CDX” should only be special order. from moisture may be expected. used for applications as outlined under (2) Although glue bond durability is described by Exposure 1 above. For sheathing grade exposure durability classification, panel surface may panels that will be exposed permanently to become uneven and irregular under prolonged the weather, specify APA Rated Sheathing moisture exposure. Panels should be allowed to APA APA dry, and panel joints and surfaces may need to be RATED SHEATHING RATED STURD-I-FLOOR Exterior (C-C Exterior under PS 1.) 40/20 19/32 INCH 20 oc 19/32 INCH sanded before applying some finish materials. SIZED FOR SPACING See Treated Plywood (page 18) for SIZED FOR SPACING T&G NET WIDTH 47-1/2 (3) Exposure 1 panels may also be used when EXPOSURE 2 EXPOSURE 2 000 000 recommended plywood grades and exposure exposure to the outdoors is on the underside only, PS 1-83 C-C PRP-108 PRP-108 HUD-UM-40C such as at roof overhangs.

5 Interior panels which lack further APA Rated Sheathing METRIC CONVERSIONS glueline information in their trademarks Span Ratings appear as two numbers Metric equivalents of nominal are manufactured with interior glue and separated by a slash, such as 32/16, thicknesses and common sizes of wood are intended for interior applications only. 48/24, etc.(2) The left-hand number structural panels are tabulated below. denotes the maximum recommended (1 inch=25.4 millimeters): A-B ¥ G-1 ¥ INT-APA ¥ 000 ¥ PS1-83 spacing of supports when the panel is used for roof sheathing with the long Panel Nominal Thickness dimension or strength axis of the panel in. mm APA across three or more supports. The right- 1/4 6.4 hand number indicates the maximum 5/16 7.9 A-B GROUP 2 11/32 8.7 recommended spacing of supports when 3/8 9.5 INTERIOR the panel is used for subflooring with the 7/16 11.1 000 15/32 11.9 PS 1-83 long dimension or strength axis of the 1/2 12.7 panel across three or more supports. A 19/32 15.1 5/8 15.9 panel marked 32/16, for example, may 23/32 18.3 be used for roof sheathing over supports 3/4 19.1 7/8 22.2 32 inches on center or for subflooring 1 25.4 SPECIES GROUP NUMBER over supports 16 inches on center. 1-3/32 27.8 Plywood manufactured under U.S. APA Rated Sturd-I- 1-1/8 28.6 Product Standard PS 1-83 may be made Floor panels are designed specifically from over 70 species of wood. These for single-floor (combined subfloor-under- Panel Nominal Dimensions species are divided according to strength layment) applications under carpet and (Width x Length) and stiffness properties into five groups. pad, and are manufactured with Span ft. mm m (approx.) Group 1 species are the strongest and Ratings of 16, 20, 24, 32 and 48 inches. 4 x 8 1219 x 2438 1.22 x 2.44 4 x 9 1219 x 2743 1.22 x 2.74 stiffest, Group 2 the next strongest and These, like those for APA Rated Sheathing, 4 x 10 1219 x 3048 1.22 x 3.05 stiffest, and so on. The Group number are based on application of the panel with appearing in an APA trademark is based the long dimension or strength axis across on the species used for face and back three or more supports. veneers.(1) Some species are used widely APA Rated Siding is produced in plywood manufacture; others rarely. with Span Ratings of 16 and 24 inches. Check local availability if a particular Panels and lap siding may be used direct species is desired. to studs or over nonstructural wall sheath- (1) Where face and back veneers are not from the ing (Sturd-I-Wall construction), or over same species group, the higher Group number is used, except for sanded panels 3/8 inch thick or SPAN RATINGS nailable panel or sheathing less and Decorative (including APA Rated Siding Some APA trademarked panels – APA (double-wall construction). Panels and lap 303) panels of any thickness. These are identified Rated Sheathing, APA Rated Sturd-I-Floor siding with a Span Rating of 16 inches by face species because they are chosen primarily for appearance and used in applications where and APA Rated Siding – carry numbers in may be applied direct to studs spaced structural integrity is not critical. Sanded panels their trademarks called Span Ratings. 16 inches on center. Panels and lap siding greater than 3/8 inch are identified by face species if These denote the maximum recom- bearing a Span Rating of 24 inches may be C or D grade backs are at least 1/8 inch thick and are not more than one species group number larger. mended center-to-center spacing in used direct to studs 24 inches on center. inches of supports over which the panel When used over nailable structural (2) An exception is APA Rated Sheathing intended sheathing, the Span Rating of Rated Siding for use as wall sheathing only. The trademarks for should be placed in construction these panels contain a single number similar to the applications. panels refers to the maximum recom- Span Rating for APA Rated Sidings. mended spacing of vertical rows of nails rather than to stud spacing.

6 CLASSIFICATION OF SPECIES

Group 1 Group 2 Group 3 Group 4 Group 5

Apitong Cedar, Port , Red Basswood , Orford , Bigtooth Poplar, American Cypress Cedar, Quaking Balsam Birch Douglas- , Cativo Sweet Fir 2(a) Subalpine Cedar Yellow Fir Hemlock, Incense Douglas- Balsam Eastern Western Fir 1(a) California Red Kapur Red Bigleaf Cottonwood Keruing Grand Eastern , Noble Jack Black Western Pacific Lodgepole (Western Maple, Sugar Silver Ponderosa Poplar) Pine White Pine Caribbean Hemlock, Redwood Eastern Ocote Western Spruce White Pine, South. Lauan Engelmann Sugar Loblolly Almon White Longleaf Bagtikan Shortleaf Mayapis Slash Red Tanoak Tangile White Maple, Black Mengkulang Meranti, Red(b) Mersawa Pine Pond Red Virginia Western White Spruce Black Red Sitka Sweetgum Tamarack Yellow- Poplar

(a) Douglas-Fir from grown in the states of Washington, Oregon, California, Idaho, , Wyoming, and the Canadian Provinces of Alberta and British Columbia shall be classed as Douglas-Fir No. 1. Douglas-Fir from trees grown in the states of Nevada, Utah, Colorado, Arizona and New Mexico shall be classed as Douglas-Fir No. 2. (b) Red Meranti shall be limited to species having a specific gravity of 0.41 or more based on green volume and oven dry weight.

7 APA PERFORMANCE RATED PANELS

APA Performance Rated Panels include In addition to meeting APA perfor- three grades – APA Rated Sheathing for mance criteria, all-veneer APA Rated residential and other light-frame sub- Sheathing, Sturd-I-Floor and Siding flooring, wall sheathing and roof sheathing panels often meet all of the provisions of applications; APA Rated Sturd-I-Floor for U.S. Product Standard PS 1-83 for residential and other light-frame single- Construction and Industrial Plywood. floor (combined subfloor-underlayment) Panels meeting PS1 provisions carry the applications under carpet and pad; and notation “PS 1-83” in the APA trademark. APA Rated Siding for residential and other For particularly demanding engineered siding applications direct to studs or over applications where cross-panel strength nailable structural sheathing. Each grade and stiffness or shear properties are of may be manufactured in a variety of ways maximum importance, Structural I Rated – as conventional plywood, as composite Sheathing is recommended. panels (veneer faces bonded to recon- APA trademarked oriented strand stituted wood cores), or as oriented strand board, in addition to its primary use in board (OSB). construction, also is widely used in do-it- All APA Performance Rated Panels, yourself applications. The distinctive regardless of composition, are designed appearance and good-two-side feature of to meet or exceed performance require- OSB panels are among the many reasons ments for their designated applications for this growing market. over the spans indicated in the APA For additional information, write for trademark. APA Performance Standards APA’s Performance Rated Panels, are recognized by model building codes Form F405. through the National Evaluation Service and by HUD.(1)

(1) The National Evaluation Service is sponsored for allowable values and/or conditions of use jointly by the Building Officials and Code concerning material presented in this brochure. It is Administrators International, promulgators of the subject to reexamination, revisions, and possible National Building Code; the International cancellation. Conference of Building Officials, promulgators of HUD recognition of wood-based Performance the Uniform Building Code; and the Southern Rated Panels is contained in Use of Materials Building Code Congress International, Bulletin UM-40c, or in UM-64 for APA Rated promulgators of the Standard Building Code. See Siding-303 (plywood). National Evaluation Service Report No. NER-108

8 GUIDE TO APA PERFORMANCE RATED PANELS Trademarks Shown Are Typical Facsimiles

APA RATED SHEATHING APA STRUCTURAL I APA RATED SIDING Specially designed for subflooring, wall RATED SHEATHING For exterior siding, fencing, etc. Can be sheathing and roof sheathing, but also Unsanded grade for use where cross-panel manufactured as conventional veneered used for broad range of other construc- strength and stiffness or shear properties plywood, as a composite or as an overlaid tion, industrial and do-it-yourself appli- are of maximum importance, such as oriented strand board siding. Both panel cations. Can be manufactured as conven- panelized roofs, diaphragms and shear and lap siding available. Special surface tional plywood, as a composite, or as walls. Can be manufactured as conven- treatment such as V-groove, shallow oriented strand board. SPAN RATINGS: tional plywood, a composite, or oriented channel groove, deep groove (such as 12/0, 16/0, 20/0, 24/0, 24/16, 32/16, strand board. All plies in Structural I ply- APA Texture 1-11), kerfed groove, 40/20, 48/24, WALL-16 oc, wood panels are special improved grades brushed, rough sawn and texture- WALL-24 oc. EXPOSURE DURABILITY and panels marked PS 1 are limited to embossed (MDO). Span Rating (stud CLASSIFICATIONS: Exterior, Exposure 1, Group 1 species. (Structural II plywood spacing for siding qualified for APA Exposure 2. COMMON THICKNESSES: panels are also provided for, but rarely Sturd-I-Wall applications) and face grade 5/16, 3/8, 7/16, 15/32, 1/2, 19/32, 5/8, manufactured. Application recommen- classification (for veneer-faced siding) 23/32, 3/4. dations for Structural II plywood are indicated in trademark. EXPOSURE identical to those for APA RATED DURABILITY CLASSIFICATION: SHEATHING plywood.) SPAN RATINGS: Exterior. COMMON THICKNESSES: APA RATED SHEATHING 20/0, 24/0, 24/16, 32/16, 40/20, 48/24. 11/32, 3/8, 15/32, 1/2, 19/32, 5/8. 24/16 7/16 INCH EXPOSURE DURABILITY CLASSIFICA- SIZED FOR SPACING EXPOSURE 1 TIONS: Exterior, Exposure 1. COMMON 000 PRP-108 THICKNESSES: 5/16, 3/8, 7/16, 15/32, APA APA HUD-UM-40C RATED SIDING 1/2, 19/32, 5/8, 23/32, 3/4. RATED SIDING 303-18-S/W 15/32 INCH 19/32 INCH 24 oc 16 oc GROUP 1 SIZED FOR SPACING SIZED FOR SPACING EXTERIOR T1-11 EXTERIOR APA RATED 000 000 PRP-108 PS 1-83 FHA-UM-64 STURD-I-FLOOR APA APA HUD-UM-40C PRP-108 Specially designed as combination RATED SHEATHING RATED SHEATHING 32/16 1/2 INCH 32/16 15/32 INCH subfloor-underlayment. Provides smooth SIZED FOR SPACING SIZED FOR SPACING EXPOSURE 1 EXPOSURE 1 surface for application of carpet and pad, 000 PS 1-83 C-D 000 PRP-108 STRUCTURAL 1 RATED and possesses high concentrated and DIAPHRAGMS-SHEAR WALLS PANELIZED ROOFS impact load resistance. Can be manufac- PRP-108 NOTE: Specify Performance Rated Panels by tured as conventional plywood, as a thickness and Span Rating. Span Ratings are based on panel strength and stiffness. Since these composite, or as oriented strand board. properties are a function of panel composition and Available edge or tongue-and- configuration as well as thickness, the same Span groove. SPAN RATINGS: 16, 20, 24, 32, Rating may appear on panels of different 48. EXPOSURE DURABILITY CLASSIFI- thicknesses. Similarly, panels of the same thickness may be marked with different Span Ratings. CATIONS: Exterior, Exposure 1, Expo- sure 2. COMMON THICKNESSES: 19/32, 5/8, 23/32, 3/4, 1, 1-1/8.

APA RATED STURD-I-FLOOR 20 oc 19/32 INCH SIZED FOR SPACING EXPOSURE 1 000 PRP-108 HUD-UM-40C

9 APA RATED SIDINGS

APA TEXTURE 1-11 APA Rated Siding-303 plywood panel with shiplapped edges and parallel grooves 1/4 inch deep, 3/8 inch wide; grooves 4 inches or 8 inches o.c. are standard. Other spacings may be avail- able on special order. T1-11 is available only in 19/32 inch and 5/8 inch thick- nesses. Rough-sanded panel shown. Also available with scratch-sanded, overlaid, brushed and other surfaces. Available in Douglas-fir, southern pine, cedar, redwood, and other species.

ROUGH SAWN Manufactured with a slight, rough-sawn texture running across panel. Available without grooves, or with grooves of various styles; in lap sidings, as well as in panel form. Generally available in 11/32 inch, 3/8 inch, 15/32 inch, APA Rated Sidings include a wide variety appearance characteristics. Depending on 1/2 inch, 19/32 inch and 5/8 inch thick- of surface textures and patterns, most of species, type of repair, finishing, etc., pre- nesses. Rough sawn also available in them developed for optimum performance mium appearance products may be found kerfed (shown) with grooves typically with stain finishes. Typical surface patterns in all grades. Some grades may be difficult 4 inches o.c. in multiples of 2 inches, are illustrated and described on pages 10- to obtain in some areas. Check with your Texture 1-11, reverse board-and-, 12. Actual dimensions of groove spacing, supplier before specifying. channel groove and V-groove (15/32 inch, width and depth may vary with the In addition to their primary use as an 1/2 inch, 19/32 inch, or 5/8 inch thick). manufacturer. Where the characteristics of exterior siding on all kinds of residential, Available in Douglas-fir, southern pine, a particular wood species are desired, commercial, institutional and industrial redwood, cedar, and other species. specify by grade and species preference. structures, APA Rated Sidings are also In order to help specifiers select the used for scores of other indoor and out- COM-PLY® most appropriate siding appearance for a applications. APA Rated Siding composite panel with specific project, APA Rated Siding-303 For complete application recommen- rough-sawn veneer faces bonded to solid, (plywood) is also identified by a grading dations, write for APA’s Design/ reconstituted structural wood core. Avail- system. There are four basic siding Construction Guide: Residential & able with grooves typically 4 inches or classifications within the system – Special Commercial, Form E30; for finishing 8 inches o.c., similar to Texture 1-11; Series 303, 303-6, 303-18 and 303-30. recommendations, APA Product Guide: or 1-1/2 inch-wide grooves spaced Each class, as shown in the table on Performance Rated Sidings, Form E300; 12 inches o.c., similar to reverse board-and- page 12, is further divided into grades and for manufacturing and grading batten pattern. Available in 19/32 inch, and according to categories of repair and information, 303 Siding Manufacturing 5/8 inch thicknesses. Long edges ship- Specifications, Form B840. lapped for continuous pattern. Available with Douglas-fir or cedar veneer faces.

10 MEDIUM DENSITY OVERLAY Available without grooving; with V-grooves (spaced 6 inches or 8 inches o.c. usually standard); or in T1-11 or reverse board-and-batten grooving as illustrated. MDO panel siding available in 11/32 inch, 3/8 inch, 15/32 inch, 1/2 inch, 19/32 inch, or 5/8 inch thicknesses; also in lap siding. MDO siding is overlaid on one side and available with texture-embossed or smooth surface.

BRUSHED APA Texture 1-11 Medium Density Overlay Brushed or relief-grain textures accent the natural grain pattern to create striking surfaces. Generally available in 11/32 inch, 3/8 inch, 15/32 inch, 1/2 inch, 19/32 inch, and 5/8 inch thicknesses. Available in Douglas-fir, cedar and other species.

CHANNEL GROOVE Shallow grooves about 1/16 inch deep, 3/8 inch wide, cut into faces of panels, 4 inches or 8 inches o.c. Other groove spacings available. Shiplapped for continuous patterns. Generally available in surface patterns and textures similar to Rough Sawn Brushed Texture 1-11 and in 11/32 inch, 3/8 inch, 15/32 inch, or 1/2 inch thicknesses. Available in Douglas-fir, southern pine, cedar, redwood and other species.

NOTE: Specific groove patterns, surface textures, species and panel thicknesses may be in limited supply in some areas. Check with your supplier before specifying.

Com-Ply® Channel Groove

11 REVERSE GUIDE TO BOARD-AND-BATTEN APA RATED SIDING Deep, wide grooves cut into brushed, Trademarks Shown Are rough sawn, scratch-sanded or other Typical Facsimiles textured surfaces. Grooves about 1/4 inch deep, 1 inch to 1-1/2 inches wide, spaced APA APA 8 inches or 12 inches o.c. with panel RATED SIDING RATED SIDING 303-18-S/W thickness of 19/32 inch and 5/8 inch. 15/32 INCH 19/32 INCH 24 oc 16 oc GROUP 1 Provides deep, sharp shadow lines. Long SIZED FOR SPACING SIZED FOR SPACING EXTERIOR T1-11 EXTERIOR 000 000 edges shiplapped for continuous pattern. PRP-108 PS 1-83 FHA-UM-64 HUD-UM-40C PRP-108 Available in Douglas-fir, southern pine, cedar, redwood and other species.

LAP SIDING Reverse Board-and-Batten APA APA RATED SIDING Rough-sawn or smooth overlaid surfaces, 303-6-W RATED SIDING LAP 3/8 INCH 7/16 INCH with square or beveled edges. In some 16 oc GROUP 3 24 oc SIZED FOR SPACING cases, lap siding is made of APA Rated EXTERIOR EXTERIOR 000 000 PS 1-83 FHA-UM-64 PRP-108 Siding-303 panels, cut to lap siding PRP-108 HUD-UM-40C dimensions. Available in 11/32 inch, 3/8 inch, 15/32 inch, 1/2 inch, 19/32 inch and 5/8 inch thicknesses.

APA RATED SIDING-303 FACE GRADES

PATCHES

CLASS GRADE5(1) WOOD SYNTHETIC

303-OC(3) Not permitted Not permitted Special 303-OL(4) Not applicable for overlays Series 303(2) 303-NR(5) Not permitted Not permitted 303-SR(6) Not permitted Permitted as Lap Siding natural-defect shape only

303-6-W Limit 6 Not permitted 303-6(2) 303-6-S Not permitted Limit 6 303-6-S/W Limit 6 – any combination

303-18-W Limit 18 Not permitted 303-18 303-18-S Not permitted Limit 18 303-18-S/W Limit 18 – any combination

303-30-W Limit 30 Not permitted 303-30(2) 303-30-S Not permitted Limit 30 303-30-S/W Limit 30 – any combination

(1) Limitations on grade characteristics are based on 4 ft. x 8 ft. panel size. Limits on other sizes vary in proportion. All panels except 303-NR allow restricted minor repairs such as shims. These and such other face appearance characteristics as knots, knotholes, splits, etc., are limited by both size and number in accordance with panel grades, 303-OC being most restrictive and 303-30 being least. Multiple repairs are permitted only on 303-18 and 303-30 panels. Patch size is restricted on all panel grades. (2) Check local availability. (3) “Clear” (4) “Overlaid” (e.g., Medium Density Overlay siding) (5) “Natural Rustic” (6) “Synthetic Rustic”

12 APA SANDED & TOUCH-SANDED PLYWOOD

Panels with B-grade or better veneer faces GUIDE TO APA-SANDED & TOUCH-SANDED PLYWOOD are sanded smooth in manufacture to fulfill Trademarks Shown Are Typical Facsimiles the requirements of their intended end use APA A-A APA A-B – applications such as cabinets, shelving, Use where appearance of both sides is For use where appearance of one side is furniture, built-ins, etc. These sanded important for interior applications such as less important but where two solid sur- panel grades – identified by face and back built-ins, cabinets, furniture, partitions; faces are necessary. EXPOSURE DURA- veneer – are widely used in a multitude of and exterior applications such as fences, BILITY CLASSIFICATIONS: Interior, construction, industrial and do-it-yourself signs, boats, shipping containers, tanks, Exposure 1, Exterior. COMMON THICK- applications where strength and stiffness ducts, etc. Smooth surfaces suitable for NESSES: 1/4, 11/32, 3/8, 15/32, 1/2, combined with premium appearance or painting. EXPOSURE DURABILITY 19/32, 5/8, 23/32, 3/4. surface smoothness is required. CLASSIFICATIONS: Interior, Exposure 1, When sanded plywood is manufac- Exterior. COMMON THICKNESSES: 1/4, A-B • G-1 • EXPOSURE 1-APA • 000 • PS1-83 tured with a special plugged inner-ply 11/32, 3/8, 15/32, 1/2, 19/32, 5/8, construction to resist dents and punc- 23/32, 3/4. APA A-D tures from concentrated loads, it also For use where appearance of only one A-A • G-1 • EXPOSURE 1-APA • 000 • PS1-83 may be used for nonstructural floor side is important in interior applications, underlayment as a substrate for vinyl or such as paneling, built-ins, shelving, other resilient flooring. The smooth, APA A-C partitions, flow racks, etc.(1) EXPOSURE sanded surface and excellent dimensional For use where appearance of one side is DURABILITY CLASSIFICATIONS: Inte- stability makes these panels ideal for floor important in exterior applications such as rior, Exposure 1. COMMON THICK- underlayment applications. soffits, fences, structural uses, boxcar and NESSES: 1/4, 11/32, 3/8, 15/32, 1/2, Touch-sanded panels – Underlayment, truck linings, farm buildings, tanks, trays, 19/32, 5/8, 23/32, 3/4. C-C Plugged, and C-D Plugged – are commercial refrigerators, etc.(1) sanded only for “sizing” to assure EXPOSURE DURABILITY CLASSIFICA- APA uniform panel thickness. TION: Exterior. COMMON THICK- A-D GROUP 1 Typical sanded and touch-sanded NESSES: 1/4, 11/32, 3/8, 15/32, 1/2, EXPOSURE 1 panel applications are described at right. 19/32, 5/8, 23/32, 3/4. 000 For complete application recommenda- PS 1-83 tions for sanded plywood in industrial APA applications, write APA. Industrial use A-C GROUP 1 guides are available on Materials EXTERIOR Handling, Form M200; Slave , 000 Form S225; and Transport Equipment, PS 1-83 Form G210.

APA B-B Utility panels with two solid sides. EXPO-

NOTE: Exterior sanded panels, C-C Plugged, C-D SURE DURABILITY CLASSIFICATIONS: Plugged and Underlayment grades can also be Interior, Exposure 1, Exterior. COMMON manufactured in Structural I (all plies limited to THICKNESSES: 1/4, 11/32, 3/8, 15/32, Group 1 species). 1/2, 19/32, 5/8, 23/32, 3/4.

B-B • G-2 • EXPOSURE 1-APA • 000 • PS1-83

13 APA B-C APA B-D APA UNDERLAYMENT Utility panel for farm service and work Utility panel for backing, sides of built- For application over structural subfloor. buildings, boxcar and truck linings, ins, industry shelving, slip sheets, sepa- Provides smooth surface for application containers, tanks, agricultural equipment, rator boards, bins and other interior or of carpet and pad, and possesses high as a base for exterior coatings and other protected applications.(1) EXPOSURE concentrated and impact load resistance. exterior uses.(1) EXPOSURE DURABILITY DURABILITY CLASSIFICATIONS: Touch sanded. For areas to be covered CLASSIFICATION: Exterior. COMMON Interior, Exposure 1. COMMON THICK- with resilient flooring, specify panels with THICKNESSES: 1/4, 11/32, 3/8, 15/32, NESSES: 1/4, 11/32, 3/8, 15/32, 1/2, “sanded face.” (2) EXPOSURE DURA- 1/2, 19/32, 5/8, 23/32, 3/4. 19/32, 5/8, 23/32, 3/4. BILITY CLASSIFICATIONS: Interior, Exposure 1. COMMON THICK- NESSES(4): 1/4, 11/32, 3/8, 1/2, 19/32, APA APA 5/8, 23/32, 3/4. B-C GROUP 1 B-D GROUP 2 EXTERIOR INTERIOR 000 000 APA PS 1-83 PS 1-83 UNDERLAYMENT GROUP 1 EXPOSURE 1 000 APA C-D PLUGGED PS 1-83 APA C-C PLUGGED(3) For open soffits, built-ins, cable reels, For use as an underlayment over structural walkways, separator boards and other subfloor, refrigerated or controlled atmos- interior or protected applications. Not a phere storage rooms, bins, substitute for Underlayment or APA Rated (1) For nonstructural floor underlayment, or other tanks, boxcar and truck and linings, Sturd-I-Floor as it lacks their puncture applications requiring improved inner-ply construc- tion, specify panels marked either “plugged inner and other exterior applications. Provides resistance. Touch-sanded. EXPOSURE plies” (also may be designated plugged crossbands smooth surface for application of carpet DURABILITY CLASSIFICATIONS: under face or plugged crossbands or core); or and pad, and possesses high concentrated Interior, Exposure 1. COMMON “meets underlayment requirements.” and impact load resistance. Touch-sanded. THICKNESSES: 3/8, 1/2, 19/32, 5/8, (2) Also available in Underlayment A-C or Under- For areas to be covered with resilient 23/32, 3/4. layment B-C grades, marked either “touch sanded” flooring, specify panels with “sanded face.” or “sanded face.” EXPOSURE DURABILITY CLASSIFICA- APA (3) Also may be designated APA Underlayment C-C Plugged. TION: Exterior. COMMON THICK- C-D PLUGGED NESSES(4): 11/32, 3/8, 1/2, 19/32, 5/8, GROUP 2 (4) Underlayment and C-C Plugged panels 1/2″ 23/32, 3/4. EXPOSURE 1 and thicker are designated by Span Rating rather 000 than species group number in trademark. PS 1-83 APA C-C PLUGGED GROUP 2 EXTERIOR 000 PS 1-83

14 APA SPECIALTY PANELS

APA trademarked specialty grades include MDO faces. EXPOSURE DURABILITY CLASSIFICATION: Exterior. COMMON panels designed for specific applications CLASSIFICATION: Exterior. COMMON THICKNESSES: 11/32, 3/8, 15/32, 1/2, (e.g., B-B Plyform for concrete forming, THICKNESSES: 1/4, 3/8, 1/2, 5/8, 3/4. 19/32, 5/8, 23/32, 3/4. Marine), or with special surface treat- MARINE • A-A • EXT-APA • 000 • PS1-83 ments for applications with specific APA performance requirements (e.g., Medium M. D. OVERLAY and High Density Overlay, Plyron). APA B-B PLYFORM GROUP 1 EXTERIOR Complete concrete forming design data CLASS I 000 are contained in APA’s Concrete Forming, APA proprietary concrete form panels PS 1-83 Form V345. For additional information on designed for high reuse. Sanded both High and Medium Density Overlay sides and mill-oiled unless otherwise plywood, write for HDO/MDO Plywood, specified. Special restrictions on species. APA DECORATIVE Form B360. Also available in HDO for very smooth Rough sawn, brushed, grooved, or other concrete finish, in Structural I, and with faces. For paneling, interior accent walls, GUIDE TO APA special overlays. EXPOSURE DURABILITY built-ins, counter facing, exhibit displays, SPECIALTY PANELS CLASSIFICATION: Exterior. COMMON etc. Made by some manufacturers in Trademarks Shown THICKNESSES: 19/32, 5/8, 23/32, 3/4. Exterior for exterior siding, gable ends, Are Typical Facsimiles fences and other exterior applications. Use APA recommendations for Exterior panels vary; APA HIGH DENSITY PLYFORM check with the manufacturer. EXPOSURE OVERLAY (HDO) B-B CLASS I DURABILITY CLASSIFICATIONS: EXTERIOR Plywood panel manufactured with a 000 Interior, Exposure 1, Exterior. COMMON hard, semi-opaque resin-fiber overlay on PS 1-83 THICKNESSES: 5/16, 3/8, 1/2, 5/8. both sides. Extremely abrasion resistant and ideally suited to scores of punishing APA construction and industrial applications, APA MEDIUM DENSITY DECORATIVE such as concrete forms, industrial tanks, OVERLAY (MDO) GROUP 2 INTERIOR work surfaces, signs, agricultural bins, Plywood panel manufactured with 000 exhaust ducts, etc. Also available with smooth, opaque, resin-treated fiber over- PS 1-83 skid-resistant screen-grid surface and in lay providing ideal base for on one Structural I. EXPOSURE DURABILITY or both sides. Excellent material choice CLASSIFICATION: Exterior. COMMON for shelving, factory work surfaces, APA PLYRON THICKNESSES: 3/8, 1/2, 5/8, 3/4. paneling, built-ins, signs and numerous APA proprietary plywood panel with hard- other construction and industrial appli- board face on both sides. Faces tempered, cations. Also available as APA Rated untempered, smooth or screened. For HDO • A-A • G-1 • EXT-APA • 000 • PS1-83 Siding-303 with texture-embossed or countertops, shelving, cabinet , smooth surface on one side only and in concentrated load flooring, etc. APA MARINE Structural I. EXPOSURE DURABILITY EXPOSURE DURABILITY CLASSIFI- Specially designed plywood panel made CATIONS: Interior, Exposure 1, Exterior. only with Douglas-fir or , COMMON THICKNESSES: 1/2, 5/8, 3/4. solid jointed cores, and highly restrictive limitations on core gaps and face repairs. PLYRON • EXPOSURE1-APA • 000 Ideal for boat hulls and other marine applications. Also available with HDO or

15 GUIDE TO SPECIFICATIONS

APA APA APA APA APA APA RATED SHEATHING RATED SHEATHING RATED SHEATHING RATED SHEATHING RATED STURD-I-FLOOR RATED STURD-I-FLOOR 32/16 15/32 INCH 40/20 19/32 INCH 48/24 23/32 INCH 24/16 7/16 INCH 20 oc 19/32 INCH 24 oc 23/32 INCH SIZED FOR SPACING SIZED FOR SPACING SIZED FOR SPACING SIZED FOR SPACING SIZED FOR SPACING SIZED FOR SPACING T&G NET WIDTH 47-1/2 T&G NET WIDTH 47-1/2 EXPOSURE 1 EXTERIOR EXTERIOR EXPOSURE 1 EXTERIOR EXPOSURE 1 000 000 000 000 000 000 PRP-108 PS 1-83 C-C PS 1-83 C-C PRP-108 PS 1-83 C-C PLUGGED PRP-108 HUD-UM-40C PRP-108 PRP-108 HUD-UM-40C PRP-108 HUD-UM-40C

ROUGH Sheathing permanently exposed to for protection against excessive moisture SECTION weather shall be classed Exterior.(16) prior to roofing application. (CSI DIVISION 6) Install with the long dimension or A. GENERAL PROVISIONS strength axis of the panel across C. FLOORS 1. Identification Requirements – Each supports, except where noted,(7) and 1. Subflooring (under structural finish panel shall be identified with the appro- with panel continuous over two or floor such as wood strip or underlay- priate trademark(1) of the APA – The more spans. For pitched roofs, wear ment) – Panel subflooring shall be (specify Engineered Wood Association, and shall skid-resistant shoes when installing roof appropriate grade): meet the requirements of the latest sheathing. Place screened surface or side APA RATED SHEATHING EXP 1 or 2 edition of U.S. Product Standard PS 1 or with skid-resistant coating up, if oriented APA RATED SHEATHING EXT APA PRP-108 Performance Standards. strand board panels are used. Suitable APA STRUCTURAL I 2. All panels which have any edge or edge support shall be provided where RATED SHEATHING EXP 1, surface permanently exposed to the indicated on drawings (or in recommen- or APA STRUCTURAL I weather shall be classed Exterior.(3)(16) dations of APA – The Engineered Wood RATED SHEATHING EXT. 3. Panel thickness, grade, and Group Association)(4) by use of panel clips, Install with the long dimension or number or Span Rating shall be at least tongue-and-groove edges, or lumber strength axis of the panel across equal to that shown on the drawings.(4) blocking between . Panel end joints supports and with panel continuous Application shall be in accordance with shall occur over . Spacing of over two or more spans. Panel end recommendations of the APA – The 1/8 inch is recommended at panel joints shall occur over framing. Spacing Engineered Wood Association.(5) ends and edges, unless otherwise of 1/8 inch is recommended at panel indicated by the panel manufacturer. ends and edges, unless otherwise B. ROOF SHEATHING 6 inches o.c. along supported panel indicated by the panel manufacturer. 1. Panel roof sheathing shall be (specify edges and 12 inches o.c. at intermediate Nail 6 inches o.c. along supported appropriate grade): supports, except that when supports are panel edges and 12 inches o.c. at inter- APA RATED SHEATHING EXP 1 or 2 spaced 48 inches o.c. or more, space nails mediate supports with 6d common APA RATED SHEATHING EXT 6 inches o.c. at all supports.(8) Use 6d nails(8) for panels 1/2 inch or less, 8d for APA STRUCTURAL I common nails for panels 1/2 inch and less greater thicknesses. Where panels are RATED SHEATHING EXP 1, and 8d for greater thicknesses, except that 1-1/8 inches thick and supports are or APA STRUCTURAL I when panels are 1-1/8 inches, use 8d ring- 48 inches o.c., nails shall be 8d ring- RATED SHEATHING EXT. shank or 10d common.(10) shank or 10d common and spaced Cover roof sheathing as soon as possible 6 inches o.c. at all supports.(10) with roofing felt or shingle underlayment

(1) The APA trademarks shown here are typical (4) Refer to the appropriate application (6) For areas to be covered with resilient flooring, examples only. recommendations in APA Design/Construction Guide: specify Underlayment or C-C Plugged panel grades Residential & Commercial, E30. marked “Sanded Face.” Underlayment A-C, (2) For 1/4-inch-thick panels, nail 3 inches o.c. along Underlayment B-C, Marine EXT, or sanded plywood panel edges and 6 inches o.c. each way throughout (5) References to APA’s recommendations may grades marked “Plugged Crossbands Under Face,” remainder of panel with 3d ring-shank nails. allow subsequent specification concerning nailing, “Plugged Crossbands (or Core),” “Plugged Inner edge support and panel orientation to be omitted. (3) Exposure 1 may be specified for applications Plies” or “Meets Underlayment Requirements” (of where prolonged but temporary exposure to the PS 1-83) may also be used under resilient flooring. weather will be required.

16 APA APA APA APA APA APA RATED SIDING RATED SHEATHING RATED SHEATHING RATED SIDING UNDERLAYMENT UNDERLAYMENT 3/8 INCH 303-6-S/W C-C PLUGGED 24/0 15/32 INCH 15/32 INCH 19/32 INCH GROUP 1 32/16 24 oc GROUP 2 SIZED FOR SPACING 16 oc GROUP 1 EXPOSURE 1 SIZED FOR SPACING SIZED FOR SPACING SIZED FOR SPACING EXPOSURE 1 EXTERIOR 000 EXPOSURE 1 EXTERIOR EXTERIOR 000 000 STRUCTURAL I RATED 000 000 000 PS 1-83 C-D PRP-108 PS 1-83 FHA-UM-64 PS 1-83 PS 1-83 DIAPHRAGM-SHEAR WALLS PRP-108 PRP-108 HUD-UM-40C PRP-108

Sand subfloor joints if necessary to Fill and thoroughly sand end and edge For maximum stiffness, install under- smooth surface prior to installing joints.(13) Lightly sand any surface layment panels with the face grain across underlayment or finish flooring. roughness and around fasteners. supports. Stagger end joints (optional 2. Combined subfloor-underlayment For field-glued floors, use adhesives under carpet and pad) and offset all (under carpet and pad)(17) – Combined meeting APA Specification AFG-01, joints by at least two inches from joints subfloor-underlayment panels shall be applied in accordance with the of subfloor panels. Butt panel ends and (specify appropriate grade): manufacturer’s recommendations. If edges to a close but not tight fit APA RATED STURD-I-FLOOR oriented strand board panels with sealed (1/32 inch spacing is recommended). EXP 1 or 2, or surfaces and edges are used, use only Nail 6 inches o.c. along panel edges and APA RATED STURD-I-FLOOR EXT. solvent-based glues; check with panel 8 inches o.c. each way throughout Install with the long dimension or manufacturer. Apply continuous line of remainder of panel with 3d ring-shank strength axis of the panel across sup- glue on joists, and continuous or spaced nails for panel thicknesses of 11/32 inch ports and with panel continuous over line of glue in groove of tongue-and- to 1/2 inch, or 4d spaced 6 inches o.c. two or more spans. Panel edges shall be groove panels. Use 6d ring- or screw- along edges and 12 inches o.c. each way tongue-and-groove or supported on shank nails spaced 12 inches o.c. at for thicker panels up to 3/4 inch.(2)(10) 2-inch lumber blocking installed between supported panel edges and intermediate Fastener length should be approximately joists. Protect against damage until finish bearings.(11) equal to the total thickness of the floor is installed. 3. Underlayment (over subflooring) – underlayment and subfloor. Stagger panel end joints. Panel end Plywood underlayment shall be (specify Fill and thoroughly sand edge and end joints shall occur over framing. Spacing appropriate grade)(6): joints.(13) Lightly sand any surface of 1/8 inch is recommended at panel APA UNDERLAYMENT INT roughness and around fasteners. ends and edges, unless otherwise indi- APA UNDERLAYMENT EXP 1, cated by the panel manufacturer. For or APA UNDERLAYMENT C-C D. WALLS AND SOFFITS nailed floors, nail panels 6 inches o.c. at PLUGGED EXT, or 1. Panel wall sheathing shall be (specify supported panel edges and 12 inches o.c. APA C-C PLUGGED EXT. appropriate grade): at intermediate supports, except that When 19/32 inch or thicker, APA APA RATED SHEATHING EXP 1 or 2 when supports are spaced 48 inches o.c., RATED STURD-I-FLOOR EXP 1 or 2 or APA RATED SHEATHING EXT space nails 6 inches o.c. at all supports. APA RATED STURD-I-FLOOR EXT may be APA STRUCTURAL I RATED Use 6d ring- or screw-shank nails for specified. Apply underlayment just prior SHEATHING EXP 1, or panels 3/4 inch thick or less, and 8d for to laying finish floor and protect against APA STRUCTURAL I RATED thicker panels. With 1-1/8 inch panels, damage until finish floor is installed. SHEATHING EXT. 10d common nails may be used if supports are well seasoned.(10)

(7) Long dimension of panel may be parallel to (9) Hot-dipped or hot-tumbled galvanized steel nails chromate coating. Note: Galvanized fasteners may supports if panel has adequate thickness. See APA are recommended for most siding applications. For react under wet conditions with the natural Design/Construction Guide: Residential & Commercial, best performance, stainless steel nails or aluminum extractives of some wood species and may cause E30 for recommendations. nails should be considered. APA tests also show staining if left unfinished. Such staining can be that electrically or mechanically galvanized steel minimized if the siding is finished in accordance (8) Engineered shear walls and diaphragms may nails appear satisfactory when plating meets or with APA recommendations, or if the roof overhang require additional nailing. See APA exceeds thickness requirements of ASTM A641 protects the siding from direct exposure to Design/Construction Guide: Residential & Commercial, Class 2 coatings, and is further protected by yellow moisture and weathering. E30 for recommendations.

17 APA APA APA APA APA APA RATED SIDING RATED SHEATHING RATED SHEATHING RATED SHEATHING RATED SHEATHING 303-18-S/W 15/32 INCH 15/32 INCH 15/32 INCH 19/32 INCH A-C GROUP 1 32/16 15/32 INCH 32/16 32/16 32/16 16 oc GROUP 1 SIZED FOR SPACING SIZED FOR SPACING SIZED FOR SPACING SIZED FOR SPACING SIZED FOR SPACING EXPOSURE 1 EXTERIOR EXTERIOR EXPOSURE 1 EXTERIOR T1-11 EXTERIOR 000 000 000 000 000 000 PS 1-83 C-D PS 1-83 C-C PS 1-83 FHA-UM-64 PS 1-83 C-C PS 1-83 PS 1-83 C-D PRP-108 PRP-108 PRP-108 PRP-108 PRP-108 APA SERIES V-600 APA SERIES V-611

Spacing of 1/8 inch is recommended nonstaining box nails for siding installed (Exterior Type) fire retardant. Each panel at panel ends and edges, unless other- over foam insulation sheathing. shall be labelled or marked by an wise indicated by the panel manufacturer. Diagonal bracing is not required with approved independent testing agency. Nail 6 inches o.c. along supported panel siding. After treatment, plywood shall be dried panel edges and 12 inch o.c. at inter- Building paper may be omitted if to an average moisture content of mediate supports with 6d common nails vertical joints in plywood panel siding are 15 percent or less. for panels 1/2 inch and less, and 8d for shiplapped, or covered with Plywood shall be all-veneer APA RATED greater thicknesses.(8) Diagonal bracing is (except for grooved siding applied hori- SHEATHING (or better, depending on not required, nor is building paper, zontally), or if siding is installed over appearance desired) EXP 1 or EXT. Note: except under stucco.(4) panel sheathing. All panel edges should Span Ratings and load capacities are 2. Siding – Plywood siding shall be be sealed. For panels to be painted, sealer based on untreated panels, and may not (specify appropriate grade and style):(12) can be paint primer; for panels to be apply following fire-retardant treatment. APA RATED SIDING EXT, or stained, sealer should be a water-repellent Obtain structural performance APA MEDIUM DENSITY OVERLAY preservative compatible with the finish. characteristics of FRT panels from the (MDO) EXT. 3. Soffits Soffits shall be (specify company providing the treatment and Spacing of 1/8 inch is recommended appropriate grade and style):(16) redrying service. at panel ends and edges, unless other- APA A-C EXT 2. Preservative-Treated Plywood – (12) wise indicated by the panel manufac- APA RATED SIDING 303 EXT, Treated plywood for (state application) turer. Nail panel siding 6 inches o.c. or APA MEDIUM DENSITY OVERLAY shall be pressure-treated in accordance along panel edges and 12 inches o.c. at (MDO) EXT. with AWPA Standard C9 with (creosote) intermediate supports with 6d non- Nail 6 inches o.c. at supported panel (pentachlorophenol) (water-borne) preser- (9) staining box, casing or siding nails for edges and 12 inches o.c. at intermediate vatives, as required for (coastal water) (9) panels 1/2 inch and less, and 8d for supports, with 6d nonstaining box, (wood foundation) (ground contact) (8) greater thicknesses. casing, or siding nails for panels 1/2 inch (above ground) exposure. Plywood treated Nail lap siding installed over nailable and less, and 8d for panels up to with water-borne preservatives shall be panel or lumber sheathing 8 inches o.c. 3/4 inch thick. dried after treatment to a moisture content along bottom edge, unless otherwise of 18 percent or less. recommended by manufacturer. When E. TREATED PLYWOOD installed direct to studs, nail lap siding at 1. Fire-Retardant-Treated Plywood – each stud with 6d nonstaining(9) box, All plywood shall be pressure-treated in casing, or siding nails for siding up to accordance with American Wood 1/2 inch thick, and 8d for thicker panels. Preservers Association (AWPA) Standard If siding is applied over non-structural C27 with an approved (low hygroscopic sheathing, use next regular nail size. Use Interior Type A) (Interior Type B)

(10) Other code-approved fasteners may be used. (12) See pages 10-12, or for more information, APA (13) This step may not be necessary under some Product Guide: Performance Rated Sidings, E300, carpet and structural flooring products – check (11) Major model building codes accept 12 inches and APA Design/Construction Guide: Residential & with flooring manufacturer. spacing with glue but some local codes may require Commercial, E30. closer spacing. When panels greater than 3/4 inch (14) Design and fabrication specifications for are used in glued floors, use same fastener schedule plywood box beams, stressed-skin panels, curved as for nailed-only construction. panels, sandwich panels and all-plywood beams are available from APA.

18 All treated plywood used in the Perma- APA STRUCTURAL I HIGH DENSITY Second coat: Top-quality exterior all- nent Wood Foundation system (PWF) OVERLAY (HDO) PLYFORM EXT, or acrylic house paint designed for use shall be marked by an approved APA B-C EXT. with primer; color as selected. Two inspection agency certified to inspect Use plywood thickness sufficient to topcoats provide better performance. preservative-treated wood, indicating support concrete at temperature and rate Exterior Panels – Stained First coat: compliance with the treating, drying, poured;(15) securely brace and shore Top-quality exterior penetrating retention and penetration requirements of forms to prevent displacement and to semitransparent oil stain where grain the AWPA Standard C22, or equivalent safely support construction loads. showthrough is desired(18); or heavily code-approved preservative-treating and pigmented solid-color oil or latex stain quality control requirements. PAINTING(12) where grain is to be masked(19); color as Plywood shall be all-veneer APA RATED (CSI Division 9) selected. Apply in one or two coats as SHEATHING (or better, depending on A. PREPARATION OF recommended by manufacturer. appearance desired) EXP 1 marked APA SURFACES Use stain-blocking primer with light- Series V-600, or EXT marked APA Series 1. Exterior Panels – Panels to be colored solid-color latex stains. V-611. Note: For PWF applications, exposed outdoors shall have all edges Interior Panels – Painted First coat: panels marked PS 1 are required. sealed. With paint, sealer may be a liberal Stain-blocking primer as recommended by coat of exterior house paint primer. With manufacturer of finish coat. F. GLUED PLYWOOD stain, seal with water-repellent preser- Second coat: Flat, semi-gloss or gloss COMPONENTS vative compatible with finish coat. topcoat designed for use with primer; 1. General – All plywood components 2. All Panels – Surface shall be clean, color as selected. Use two topcoats if shall be fabricated in accordance with the dry and free of loose wood fibers. Holes needed to cover. appropriate Fabrication Specification.(14) and cracks shall be filled with putty or Interior Panels – Color Tone First coat: Each original plywood panel shall bear the plastic wood (except for rustic type Stain and companion sealer mixed to appropriate trademark of APA – The panels). After dry, sand lightly in the selected color (or sealer, then stain applied Engineered Wood Association. Glue shall be direction of the grain of face veneer or separately). of resorcinol or phenolic resin base (for texture to match existing surfaces. Second coat: Interior satin outdoor exposure), or casein with a mold Any or sap spots shall be (additional coats can be applied as inhibitor (for indoor exposure). first touched up with a sealer where the desired for depth of luster). finish is paint. CONCRETE Interior Panels – Light Stain First coat: (CSI Division 3) B. APPLICATION OF Pigmented resin sealer (wiped off when A. MATERIALS FINISH tacky). 1. Forms – Plywood concrete forms (Specify by brush, roller, or spray; brush Second coat: Clear resin sealer. shall be (specify appropriate grade): application of the first coat gives best Third coat: Tinted undercoat; thin APA B-B PLYFORM CLASS I EXT, performance.) enamel; pigmented sealer; or light stain APA HIGH DENSITY OVERLAY Exterior Panels – Painted First coat: applied thinly and wiped to the desired (HDO) PLYFORM CLASS I EXT Exterior stain-blocking primer as recom- color depth; color as selected. APA STRUCTURAL I B-B PLY-FORM mended by manufacturer of finish coat. Fourth coat: Interior satin varnish EXT (May be tinted.) Apply quantity as (additional coats can be applied as recommended by paint manufacturer. desired for depth of luster).

(15) Thickness recommendations are contained (17) Specify veneer-faced STURD-I-FLOOR with (18) Semitransparent stains may be used on in APA Design/Construction Guide: Concrete “sanded face” when resilient flooring is to be plywood face grades 303-OC, 303-NR or 303-6-W. Forming, V345. applied. Otherwise, an additional layer of Other 303 face grades should not be finished with underlayment is recommended when resilient semitransparent stains unless specifically (16) Open soffits or roof sheathing exposed on the flooring is to be applied over STURD-I-FLOOR. recommended by the panel manufacturer. underside may be any panel classed Exposure 1 (See C.3 for recommended grades.) where appearance is not a major consideration. (19) Only latex formulations are recommended on APA 303-SR and 303-NR grades of plywood siding.

19 STORAGE AND HANDLING INSTALLATION

Build platform of cull panel and scrap lumber Like all building materials, APA trade- While APA trademarked structural wood 4x4’s for stacking panels. marked structural wood panels should be panels exhibit excellent dimensional properly stored, handled and installed to stability, panel edges and ends should be assure superior in-service performance. spaced slightly when installed to allow Protect the edges and ends of panels, for any expansion caused by moisture especially tongue-and-groove floor and ship- absorption. Recommended spacings are

Stretch plastic film over platform to block lapped siding panels. Place panels to be given with the illustrations. passage of ground moisture. moved by forklift on pallets or bunks when APA Rated Siding, in addition, should received to avoid damage by fork tines. be edge sealed (both blind and exposed Panels to be transported on open edges) to minimize the possibility of ...... truckbeds should be covered with surface checking, water staining or . . . . standard tarpaulins. For open railcar mildew. Sealing is easiest when panels . . . shipment, use “lumber wrap” to avoid are stacked. Reseal new edges of panels extended weather exposure. cut to fit. The type of sealant ...... Store panels whenever possible under recommended depends on the finish roof, especially if they won’t be used soon treatment to be used on the siding. after received. Keep sanded and other Once installed, protect panels as soon Nail film to top panel and drape over ends for protection against driving appearance grades away from open as possible. For example, protect sub- rain. Weight lower end with 2x4. doorways, and weight down the top panel flooring by installing and sheathing walls in a stack to avoid any possible warpage and roofs; protect roof sheathing with

Lay two 2x4’s on top of stack. from humidity. If moisture absorption is roofing felt or finish roofing material; expected, cut steel banding on panel protect underlayment with plastic

Pad corners with rags. bundles to prevent edge damage. sheeting, or heavy kraft paper ...... Panels to be stored outside should be prior to intalling finish flooring, etc.

. . stacked on a level platform supported by Enclosing the structure as quickly as . . . . . 4x4 stringers or other blocking. Never possible, keeping panels dry before leave panels or the platform in direct attaching other materials (such as ...... contact with the ground. Use at least three underlayment or finish flooring), and full-width supports along the eight-foot assuring adequate ventilation, particularly length of the panel – one centered and the in attics and crawl spaces, can prevent

Stretch film over stack and others 12 to 16 inches from each end. many costly problems and callbacks. secure to -down stakes. Cover the stack loosely with plastic For complete residential and commer- sheets or tarps. Anchor the covering at cial application recommendations, see the top of the stack, but keep it open and APA’s Design/Construction Guide: away from the sides and bottom to assure Residential & Commercial, Form E30. good ventilation. Tight coverings prevent air circulation and, when exposed to sunlight, create a “greenhouse” effect which may encourage mold formation.

20

APA RATED STURD-I-FLOOR APA STURD-I-WALL (Single Floor) (APA RATED SIDING Direct to Studs or over Nonstructural Wall Sheathing) Carpet and pad Long Stagger end joints dimension

a Insulation as required and a

awarm-side vapor retarder.

aa No diagonal wall aBlocking with square bracing required with edge panels panel siding.

a a a

aa a a a a a

APA RATED 1/8″ spacing is STURD-I-FLOOR a a a a a

a recommended at all

edge and end joints. aa a a a a

a a a a 2x joists, wood I-joists

or floor a a a aa

a a APA RATED SIDING

″ a aa a a a a Panel spacing (face) 1/8

″ a 1/8 spacing is 1/2″ – 3/4″ T&G Joint a a a a a a a recommendeda a a a aa at all edge andaa end joints.a a aa a a a a a a aa NOTE: Provide adequate a aaa a aa a a a a a a aaa a ventilation and use ground a a a cover vapor retarder in crawl aaa a a a a a a a ″ a Tongue-&-groove edges (or 2 lumber space. Panels must be dry Joints – no building paper blocking between supports) before applying finish floor. 6″ minimum

required where edges are shiplapped,a a a a a a aa caulked or battened. If caulking is not clearance, siding aaaa aa a a APA UNDERLAYMENT OVER used with unbattened square butt to grade APA RATED SHEATHING SUBFLOORING joints, treat plywood edges with water repellent. (Double Floor)

Resilient tile or sheet Face grain flooring, carpet or APA RATED SIDING OVER nonstructural flooring (plywood) a a APA RATED SHEATHING aa a aa a Long dimension (Double Wall) 6″ minimum clearance, asiding to grade a a a a a aaa a a a a 1/8″ spacing is a a a a APA recommended at all sheathing edge a a a a a UNDERLAYMENTa a (specify “sanded and end joints. a aa a a a face” when finish is a resilient flooring) “Block” horizontal a a a aa a a a a Joint astagger joints in panels aa a a a a used for bracing. a aa 1/32″ space is a a a a a optional for recommended between subfloor panels a a a a a a aaa a a a a a underlayment butt joints Filler strip if a a a a a aa aaa a a a a required Stagger end joints in under- a a a a a a aa a aa a a aaa a a layment panels (optional 1/8″ spacing is a a a a a a a a a a under carpet and pad). recommended at all a subflooring edges APA RATED SHEATHING

a aa aaa a APA RATED SHEATHING or board subflooring and end joints. applied with long a a (subfloor must be dry before laying underlayment dimension across studs APA RATED SIDING aaa a aaa a a or other finish flooring) spaced as per STURD-I-WALL APA RATED SHEATHING applied with OPEN SOFFITS long dimension parallel to studs APA RATED SHEATHING Shim at each for APA RATED SIDING OVER flush joint at change of panel thickness APA RATED SHEATHING (Double Wall) Long dimension APA RATED SHEATHING Any appropriate APA Exterior 1/8″ spacing is or Exposure 1 panel grade and recommended at all thickness for desired appearance edge and end joints and load-carrying capacity.

Asphalt or wood shingles CLOSED SOFFITS or shakes. Follow roofing manufacturer’s APA RATED SHEATHING recommendations for roofing felt.

Protect edges of Exposure 1 or 2 sheathing against Panel clip or tongue-&-groove exposure to weather. edges if required Long dimension Continuous screened vent Protect edges of Exposure 1 or louvered vent and 2 panels against exposure Long dimension to weather, or use Exterior panel starter strip. 1/8″ spacing is recommended at all panel end and edge joints. NOTE: For pitched roofs, wear skid-resistant shoes when installing roof Support all panel edges. Any appropriate grade of sheathing. Place screened surface or side with skid-resistant coating up, if APA EXT plywood for soffit oriented strand board panels are used. Cover sheathing as soon as possible with roofing felt for extra protection against excessive moisture prior to roofing application. METHOD OF ORDERING GRADE AVAILABILITY APA PERFORMANCE CONCRETE FORM Some panel grades, thicknesses, Span RATED PANELS Designate thickness, APA trademark, Ratings, or species may be difficult to Designate thickness, APA trademark, Class, dimensions, number of pieces. For obtain in some areas. Check with your grade, Span Rating, exposure durability example: supplier for availability or include an classification, dimensions, number of 5/8″ APA B-B PLYFORM Class I, alternate panel in specifications. Standard pieces. For example: 48″ x96″, 100 pcs. (B-B Plyform panel dimensions are four feet by eight 15/32″ APA RATED SHEATHING panels are manufactured only as feet, although some mills also produce 32/16, Exposure 1, 48″ x 96″, 100 pcs. Exterior panels and are mill-oiled panels nine or ten feet or longer. 23/32″ APA RATED STURD-I-FLOOR unless otherwise specified.) 24 oc, Exterior, 48″(1) x 96″, 100 pcs. ADDITIONAL (Note “square edge” or “tongue-and- INFORMATION groove” as desired.) OVERLAID PANELS For additional information about APA Designate thickness, APA trademark, trademarked panel products or appli- grade, Group number, dimensions, cations, contact the APA – The Engineered number of pieces. For example: Wood Association, PO Box 11700, APA RATED SIDINGS 1/2″ APA MEDIUM DENSITY Tacoma, Washington 98411-0700, or Designate thickness, APA trademark, face OVERLAY (MDO), or (APA 303-0L the nearest APA regional field office listed grade (for APA Rated Siding-303), Span MDO in the case of overlaid panels on the back cover. A complete listing of Rating, texture, pattern, dimensions, produced under the APA RATED other APA product and application number of pieces. For example: SIDING-303 manufacturing specifi- guides is contained in the Association’s ″ 19/32 APA RATED SIDING, cation), Group 1, 48″ x 96″ 100 pcs. Publications Index, Form B300. 303-18-W, 16 oc, rough-sawn (Any special requirements, such as ″ Texture 1-11, grooves 4 oc, only one side overlaid, or surface ″ ″ 48 x 96 , 100 pcs. (Note texture or weight of surfacing material, manufacturer’s trade name if desired.) should be stated after the standard specification.)

APA SANDED AND TOUCH-SANDED PANELS Designate thickness, APA trademark, (2) (1) Most tongue-and-groove panels are grade, Group number , exposure dura- manufactured with a 47-1/2-inch net face width, bility classification, dimensions, number although manufacturing practices vary. Check with of pieces. For example: your supplier. 3/8″ APA A-A, Group 1, Exterior, (2) Underlayment and C-C Plugged panels 1/2″ 48″ x 96″, 100 pcs. and thicker are span rated and do not contain species group number in trademark. Designate 3/8″ APA Underlayment, Group 1, Span Rating. Exposure 1, 48″ x 96″, 100 pcs. (Note “sanded face” if used under resilient flooring, or see pages 13-14 for additional grades.)

22 ABOUT APA

The APA – The Engineered Wood Association ■ Operate the most sophisticated ■ Work to secure acceptance of is a nonprofit trade association whose program for basic panel research in structural wood panel products and member mills produce approximately 80 the world. applications by code officials, insuring percent of the structural wood panel agencies and lending institutions. products manufactured in the United ■ Maintain an international network of States and a signifcant percentage of field representatives to assist panel ■ Develop and maintain performance panels produced in . product users, specifiers, dealers, distrib- and industry product standards. Founded in 1933 as the utors and other segments of the trade. Plywood Association and widely recog- ■ Conduct in-depth market research nized today as a leader in the structural ■ Conduct informational buyer and and development programs to identify wood panel industry, APA performs specifier seminars and provide dealer and and penetrate new panel markets in the numerous functions and services on distributor sales training. U.S. and abroad. behalf of panel product users, specifiers, ■ ■ dealers, distributors, schools and univer- Publish a vast inventory of publi- Work in conjunction with other sities and other key groups. cations on panel grades, applications, wood product industry organizations on Among the most important of these design criteria and scores of other topics. solutions to problems of common functions is quality inspection and concern. ■ testing. APA maintains five quality testing Advertise and publicize panel laboratories in key producing regions, product systems and applications in Always insist on panels bearing the including a 37,000-square foot research national trade and consumer magazines. mark of quality – the APA trademark. center at Association headquarters in Your APA panel purchase or specification ■ Sponsor annual design competitions Tacoma, Washington. is your highest assurance of quality. It is for architects, builders, students and do- But quality validation is only one of also an investment in the many trade it-yourself home craftsmen. APA’s many functions. We also: services and programs that APA undertakes on your behalf.

The product use recommendations in this publication are based on APA – The Engineered Wood Association’s continuing programs of laboratory testing, product research, and comprehensive field experience. However, because the Association has no control over quality of workmanship or the conditions under which engineered wood products are used, it cannot accept responsibility for product performance or designs as actually constructed. Because engineered wood product performance requirements vary geographically, consult your local architect, engineer or design professional to assure compliance with code, construction, and performance requirements.

23 We have field representatives in most major U.S. cities and in Canada who can help answer questions involving APA trademarked products. For additional assistance in specifying APA panel products, get in touch with your nearest APA regional office. Call or write:

Western Region 440 Northlake Center, Suite 211 Dallas, Texas 75238-4418 (214) 348-0643 Fax: (214) 348-3424

Eastern Region 2130 Barrett Park Drive, Suite 102 P.O. Box 440069 Kennesaw, Georgia 30144-3681 (404) 427-9371 Fax: (404) 423-1703

International Marketing Division U.S. Headquarters 7011 So. 19th St. P.O. Box 11700 Tacoma, Washington 98411-0700 (206) 565-6600 Fax: (206) 565-7265 (Offices: Antwerp, Belgium; London, United Kingdom; Madrid, Spain; Hamburg, Germany; Mexico City, Mexico; Tokyo, .) For Caribbean/Latin America, contact headquarters in Tacoma.

Do the right thing right.™ Wood is good. It is the earth’s natural, energy efficient and renewable building material. Engineered wood is a better use of wood. It uses less wood to make more wood products. That’s why using APA trademarked plywood, oriented strand board and APA EWS laminated beams is the right thing to do.

APA The Engineered Wood Association

P.O. Box 11700 Tacoma, Washington 98411-0700 (206) 565-6600 / Fax (206) 565-7265

Form No. J20G/Revised August 1992/0200