grades and specifications - burt forest products...

G R A D E S A N D

SPECIFICATIONS

P R O D U C T G U I D E

A P AThe Eng ine e r ed Wood As so c i a t i on

C O N T E N T S

Introduction ................................................................................................. 3

Key Definitions ............................................................................................. 4

APA Trademark........................................................................................ 4

Product Standard PS 1-83 ........................................................................ 4

APA Performance Standards ..................................................................... 5

Grade ...................................................................................................... 5

Exposure Durability ................................................................................. 5

Species Group Number ............................................................................ 7

Span Ratings ............................................................................................ 7

APA Performance Rated Panels...................................................................... 9

APA Rated Siding.......................................................................................... 11-13

APA Sanded and Touch-sanded Plywood ...................................................... 14-15

APA Specialty Grades.................................................................................... 16

Guide to Specifications ................................................................................. 17-20

Storage and Handling.................................................................................... 21

Installation ................................................................................................... 21-22

Method of Ordering...................................................................................... 23

Grade Availability.......................................................................................... 23

Additional Information.................................................................................. 23

About APA ................................................................................................... 24

I N T R O D U C T I O N

This guide to APA – The Engineered Wood

Association panel grades and specifications is

meant to serve as a useful reference source for

structural wood panel users, specifiers,

dealers and distributors. It contains key

information about the many structural wood

panel grades produced by APA member mills,

including APA Performance Rated Panels,

sanded plywood, and specialty grades.

It illustrates and explains APA trademarks.

It provides a comprehensive guide to

architectural specifications. And it contains

panel installation recommendations for

typical construction applications.

For complete panel application

recommendations or additional product

information, consult any of the other APA

publications cited throughout this brochure.

Or for additional specification or design

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.

©19

95 A

PA–

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APA TRADEMARK

The APA – The Engineered WoodAssociation’s trademarks appear only onproducts manufactured by APA membermills. The marks signify that themanufacturer is committed to APA’srigorous program of quality inspectionand testing and that panel quality issubject to verification through APA audit– a procedure designed to assuremanufacture in conformance with APAperformance standards and/or U.S.Product Standard PS 1-83 for Constructionand Industrial Plywood.

Unsanded and touch-sanded panels,and panels with “B” or better veneer onone side only, usually carry the APA trade-mark on the panel back. Panels with bothsides of “B” or better veneer, or withspecial overlaid surfaces (such asMedium Density Overlay), carrythe APA trademark onthe panel edge.

U .S . PRODUCT

STANDARD PS 1 -83

U.S. Product Standard PS 1-83 forConstruction and Industrial Plywood is avoluntary commodity standard developedcooperatively by the U.S. Department ofCommerce and the construction andindustrial plywood industry. PS 1-83establishes requirements for producing,marketing and specifying construction andindustrial plywood. With the exception ofPlyron and some APA Performance RatedPanels, all of the other plywoodgrades described in this guideare produced under theprovisions of U.S. ProductStandard PS 1-83.

Panels conforming to the productstandard carry the notation “PS 1-83” inthe lower portion of the APA trademark.

For a complete copy of U.S. ProductStandard PS 1-83 for Construction andIndustrial Plywood, Form H850, write theAPA – The Engineered Wood Association.

3

K E Y D E F I N I T I O N S

Tongue-and-groove

4

APA PERFORMANCE

STANDARDS

APA performance standards are the resultof manufacturing technology that makespossible the manufacture of structuralpanel products from wood by-productsand species not provided for in U.S.Product Standard PS 1-83. APA perfor-mance standards deal exclusively withhow a product must perform in a desig-nated application rather than from what orhow the product must be manufactured.

Panels produced under APA performancestandards – called APA Performance RatedPanels – must meet several performancebaseline requirements according to thepanel’s designated end use. These perfor-mance requirements include uniform andconcentrated static and impact loadcapacity, fastener-holding ability, rackingresistance, dimensional stability, andbond durability.

In addition to conventional veneerplywood, APA performance standardsencompass such other panel products ascomposites and oriented strand board.(See APA Performance Rated Panels,page 8.)

For complete performance testing andqualification information, write APA forPRP-108, Performance Standards andPolicies for Structural-Use Panels,Form E445.

GRADE

The term “grade” may refer to panel gradeor to veneer grade. Panel grades are gen-erally identified in terms of the veneergrade used on the face and back of thepanel (e.g., A-B, B-C, etc.), or by a namesuggesting the panel’s intended enduse (e.g., APA Rated Sheathing,Underlayment, etc.).

Veneer grades define veneer appearancein terms of natural unrepaired growthcharacteristics and allowable number andsize of repairs that may be made duringmanufacture. The highest quality veneer is“A,”(1) the lowest “D.” The minimum grade

of veneer permitted in Exterior plywood is“C.” “D” veneer is used only in panelsintended for interior use or forapplications protected from permanentexposure to the weather.

EXPOSURE DURAB IL I TY

APA trademarked panels may beproduced in four exposure durabilityclassifications – Exterior, Exposure 1,Exposure 2, and Interior. The exposuredurability classification relates to gluebond, and thus to structural integrity.Since aesthetic (non-structural) attributesof panels may be compromised to somedegree by exposure to weather(2),installation recommendations in thispublication are designed to provideoptimum overall performance.Exterior panels have a fullywaterproof bond and are designed forapplications subject to permanentexposure to the weather or to moisture.

Exposure 1 panels have a fullywater-proof bond and are designed forapplications where long constructiondelays may be expected prior to providingprotection, or where high moistureconditions may be encountered in service.Exposure 1 panels are made with the sameexterior adhesives used in Exterior panels.However, because other compositionalfactors may affect bond performance, onlyExterior panels should be used forpermanent exposure to the weather.(3)

TYP ICAL APA

TRADEMARKS

RATED STURD-I-FLOOR

000PS 1-83 UNDERLAYMENT

PRP-108

APA

24 oc 23/32 INCHSIZED FOR SPACING

T&G NET WIDTH 47-1/2EXPOSURE 1

RATED SHEATHING

32/16

000PRP-108

HUD-UM-40C

APA15/32 INCH

SIZED FOR SPACINGEXPOSURE 1

000PS 1-83 FHA-UM-64

PRP-108

APA

SIZED FOR SPACINGEXTERIOR

RATED SIDING303-18-S/W

11/32 INCHGROUP 124 oc

Panelgrade

SpanRating Thickness

Millnumber

Exposuredurabilityclassification

ProductStandard

Panelgrade

SpanRating Thickness

Millnumber


Panelgrade

SpanRating

Thickness

Millnumber


APA’s Performance-Rated

Panel Standard

Sidingface grade

Speciesgroup

number

HUD/FHArecognition

Product Standard

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

Faceveneer


Backveneer

Speciesgroupnumber

Millnumber

ProductStandard

RATED SHEATHING

48/24

000PS 1-83 C-C

PRP-108

APA23/32 INCH


000PS 1-83

APA

EXTERIOR

A-C GROUP 1

RATED SHEATHING

32/16

000PRP-108

HUD-UM-40C

APA15/32 INCH


A-D

000PS 1-83

APA

GROUP 1

EXPOSURE 1

5

NOTE: All-veneer APA Rated SheathingExposure 1, commonly called “CDX” in thetrade, is frequently mistaken as an Exteriorpanel and erroneously used in applicationsfor which it does not possess the requiredresistance to weather. “CDX” should only beused for applications as outlined underExposure 1 above. For sheathing gradepanels that will be exposed permanently tothe weather, specify APA Rated SheathingExterior (C-C Exterior under PS 1.)

See Treated Plywood (page 18) forrecommended plywood grades and exposure

durability classifications in applicationsrequiring fire-retardant-treated orpreservative-treated plywood.

(1) Some manufacturers also produce a premium“N” grade (natural finish) veneer, available only onspecial order.

(2) Although glue bond durability is described byexposure durability classification, panel surface maybecome uneven and irregular under prolongedmoisture exposure. Panels should be allowed todry, and panel joints and surfaces may need to besanded before applying some finish materials.

(3) Exposure 1 panels may also be used whenexposure to the outdoors is on the underside only,such as at roof overhangs.

Exposure 2 panels (identified asInterior type with intermediate glueunder PS 1) are intended for protectedconstruction applications where onlymoderate delays in providing protectionfrom moisture may be expected.

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

ASolid surface. Shims, sled or router repairs, and tight knots to1 inch across grain permitted. Wood or synthetic repairspermitted. Some minor splits permitted.BImproved C veneer with splits limited to 1/8 inch width andknotholes or other open defects limited to 1/4 x 1/2 inch.Admits some broken grain. Wood or synthetic repairspermitted.

CPlugged

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

CKnots and knotholes to 2-1/2 inch width across grain and1/2 inch larger within specified limits. Limited splits allowed.Stitching permitted. Limited to Interior, Exposure 1 andExposure 2 panels.

D

VENEER GRADES

RATED SHEATHING

40/20

000PS 1-83 C-C

PRP-108

APA19/32 INCH


RATED STURD-I-FLOOR

000PRP-108

HUD-UM-40C

APA



Interior panels which lack furtherglueline information in their trademarksare manufactured with interior glue andare intended for interior applications only.

SPECIES GROUP NUMBER

Plywood manufactured under U.S.Product Standard PS 1-83 may be madefrom over 70 species of wood. Thesespecies are divided according to strengthand stiffness properties into five groups.Group 1 species are the strongest andstiffest, Group 2 the next strongest andstiffest, and so on. The Group numberappearing in an APA trademark is basedon the species used for face and backveneers.(1) Some species are used widelyin plywood manufacture; others rarely.Check local availability if a particularspecies is desired.

SPAN RAT INGS

Some APA trademarked panels – APARated Sheathing, APA Rated Sturd-I-Floorand APA Rated Siding – carry numbers intheir trademarks called Span Ratings.These denote the maximum recom-mended center-to-center spacing ininches of supports over which the panelshould be placed in constructionapplications.

APA Rated Sheathing

Span Ratings appear as two numbersseparated by a slash, such as 32/16,48/24, etc.(2) The left-hand numberdenotes the maximum recommendedspacing of supports when the panel isused for roof sheathing with the longdimension or strength axis of the panelacross three or more supports. The right-hand number indicates the maximumrecommended spacing of supports whenthe panel is used for subflooring with thelong dimension or strength axis of thepanel across three or more supports. Apanel marked 32/16, for example, maybe used for roof sheathing over supports32 inches on center or for subflooringover supports 16 inches on center.APA Rated Sturd-I-

Floor panels are designed specificallyfor single-floor (combined subfloor-under-layment) applications under carpet andpad, and are manufactured with SpanRatings of 16, 20, 24, 32 and 48 inches.These, like those for APA Rated Sheathing,are based on application of the panel withthe long dimension or strength axis acrossthree or more supports.APA Rated Siding is producedwith Span Ratings of 16 and 24 inches.Panels and lap siding may be used directto studs or over nonstructural wall sheath-ing (Sturd-I-Wall construction), or overnailable panel or lumber sheathing(double-wall construction). Panels and lapsiding with a Span Rating of 16 inchesmay be applied direct to studs spaced16 inches on center. Panels and lap sidingbearing a Span Rating of 24 inches may beused direct to studs 24 inches on center.When used over nailable structuralsheathing, the Span Rating of Rated Sidingpanels refers to the maximum recom-mended spacing of vertical rows of nailsrather than to stud spacing.

METR IC CONVERS IONS

Metric equivalents of nominalthicknesses and common sizes of woodstructural panels are tabulated below.(1 inch=25.4 millimeters):

(1) Where face and back veneers are not from thesame species group, the higher Group number isused, except for sanded panels 3/8 inch thick orless and Decorative (including APA Rated Siding303) panels of any thickness. These are identifiedby face species because they are chosen primarilyfor appearance and used in applications wherestructural integrity is not critical. Sanded panelsgreater than 3/8 inch are identified by face species ifC or D grade backs are at least 1/8 inch thick andare not more than one species group number larger.

(2) An exception is APA Rated Sheathing intendedfor use as wall sheathing only. The trademarks forthese panels contain a single number similar to theSpan Rating for APA Rated Sidings.

6

A-B • G-1 • INT-APA • 000 • PS1-83

000PS 1-83

APA

INTERIOR

A-B GROUP 2

Pane l Nomina l Th i ckne s s

i n . mm

1/4 6.4

5/16 7.9

11/32 8.7

3/8 9.5

7/16 11.1

15/32 11.9

1/2 12.7

19/32 15.1

5/8 15.9

23/32 18.3

3/4 19.1

7/8 22.2

1 25.4

1-3/32 27.8

1-1/8 28.6

Pane l Nomina l D imens i on s(W id th x Leng th )

f t . m m m ( a p p r o x . )

4 x 8 1219 x 2438 1.22 x 2.44

4 x 9 1219 x 2743 1.22 x 2.74

4 x 10 1219 x 3048 1.22 x 3.05

7

C L A S S I F I C A T I O N O F S P E C I E S

Group 1 Group 2 Group 3 Group 4 Group 5

Apitong Cedar, Port Alder, Red Aspen BasswoodBeech, Orford Birch, Paper Bigtooth Poplar,

American Cypress Cedar, Alaska Quaking BalsamBirch Douglas- Fir, Cativo

Sweet Fir 2(a) Subalpine CedarYellow Fir Hemlock, Incense

Douglas- Balsam Eastern WesternFir 1(a) California Maple Red

Kapur Red Bigleaf CottonwoodKeruing Grand Pine EasternLarch, Noble Jack Black

Western Pacific Lodgepole (WesternMaple, Sugar Silver Ponderosa Poplar)Pine White Spruce Pine

Caribbean Hemlock, Redwood EasternOcote Western Spruce White

Pine, South. Lauan Engelmann SugarLoblolly Almon WhiteLongleaf BagtikanShortleaf MayapisSlash Red

Tanoak TangileWhite

Maple, BlackMengkulangMeranti,

Red(b)

MersawaPine

PondRedVirginiaWestern

WhiteSpruce

BlackRedSitka

SweetgumTamarackYellow-

Poplar

(a) Douglas-Fir from trees grown in the states of Washington, Oregon,California, Idaho, Montana, Wyoming, and the Canadian Provinces ofAlberta 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 0.41or more based on green volume and oven dry weight.

APA Performance Rated Panels includethree grades – APA Rated Sheathing forresidential and other light-frame sub-flooring, wall sheathing and roof sheathingapplications; APA Rated Sturd-I-Floor forresidential and other light-frame single-floor (combined subfloor-underlayment)applications under carpet and pad; andAPA Rated Siding for residential and othersiding applications direct to studs or overnailable structural sheathing. Each grademay be manufactured in a variety of ways– as conventional plywood, as compositepanels (veneer faces bonded to recon-stituted wood cores), or as oriented strandboard (OSB).

All APA Performance Rated Panels,regardless of composition, are designedto meet or exceed performance require-ments for their designated applicationsover the spans indicated in the APAtrademark. APA Performance Standardsare recognized by model building codesthrough the National Evaluation Serviceand by HUD.(1)

In addition to meeting APA perfor-mance criteria, all-veneer APA RatedSheathing, Sturd-I-Floor and Sidingpanels often meet all of the provisions ofU.S. Product Standard PS 1-83 forConstruction and Industrial Plywood.Panels meeting PS1 provisions carry thenotation “PS 1-83” in the APA trademark.

For particularly demanding engineeredapplications where cross-panel strengthand stiffness or shear properties are ofmaximum importance, Structural I RatedSheathing is recommended.

APA trademarked oriented strandboard, in addition to its primary use inconstruction, also is widely used in do-it-yourself applications. The distinctiveappearance and good-two-side feature ofOSB panels are among the many reasonsfor this growing market.

For additional information, write forAPA’s Performance Rated Panels,Form F405.

8

A P A P E R F O R M A N C E R A T E D P A N E L S

(1) The National Evaluation Service is sponsoredjointly by the Building Officials and CodeAdministrators International, promulgators of theNational Building Code; the InternationalConference of Building Officials, promulgators ofthe Uniform Building Code; and the SouthernBuilding Code Congress International,promulgators of the Standard Building Code. SeeNational Evaluation Service Report No. NER-108

for allowable values and/or conditions of useconcerning material presented in this brochure. It issubject to reexamination, revisions, and possiblecancellation.HUD recognition of wood-based PerformanceRated Panels is contained in Use of MaterialsBulletin UM-40c, or in UM-64 for APA RatedSiding-303 (plywood).

9

APA RATED SHEATH ING

Specially designed for subflooring, wallsheathing and roof sheathing, but alsoused for broad range of other construc-tion, industrial and do-it-yourself appli-cations. Can be manufactured as conven-tional plywood, as a composite, or asoriented strand board. SPAN RATINGS:12/0, 16/0, 20/0, 24/0, 24/16, 32/16,40/20, 48/24, WALL-16 oc, WALL-24 oc. EXPOSURE DURABILITYCLASSIFICATIONS: Exterior, Exposure 1,Exposure 2. COMMON THICKNESSES:5/16, 3/8, 7/16, 15/32, 1/2, 19/32, 5/8,23/32, 3/4.

APA RATED

STURD- I - F LOOR

Specially designed as combinationsubfloor-underlayment. Provides smoothsurface for application of carpet and pad,and possesses high concentrated andimpact load resistance. Can be manufac-tured as conventional plywood, as acomposite, or as oriented strand board.Available square edge or tongue-and-groove. SPAN RATINGS: 16, 20, 24, 32,48. EXPOSURE DURABILITY CLASSIFI-CATIONS: Exterior, Exposure 1, Expo-sure 2. COMMON THICKNESSES:19/32, 5/8, 23/32, 3/4, 1, 1-1/8.

APA STRUCTURAL I

RATED SHEATH ING

Unsanded grade for use where cross-panelstrength and stiffness or shear propertiesare of maximum importance, such aspanelized roofs, diaphragms and shearwalls. Can be manufactured as conven-tional plywood, a composite, or orientedstrand board. All plies in Structural I ply-wood panels are special improved gradesand panels marked PS 1 are limited toGroup 1 species. (Structural II plywoodpanels are also provided for, but rarelymanufactured. Application recommen-dations for Structural II plywood areidentical to those for APA RATEDSHEATHING plywood.) SPAN RATINGS:20/0, 24/0, 24/16, 32/16, 40/20, 48/24.EXPOSURE DURABILITY CLASSIFICA-TIONS: Exterior, Exposure 1. COMMONTHICKNESSES: 5/16, 3/8, 7/16, 15/32,1/2, 19/32, 5/8, 23/32, 3/4.

APA RATED S ID ING

For exterior siding, fencing, etc. Can bemanufactured as conventional veneeredplywood, as a composite or as an overlaidoriented strand board siding. Both paneland lap siding available. Special surfacetreatment such as V-groove, shallowchannel groove, deep groove (such asAPA Texture 1-11), kerfed groove,brushed, rough sawn and texture-embossed (MDO). Span Rating (studspacing for siding qualified for APASturd-I-Wall applications) and face gradeclassification (for veneer-faced siding)indicated in trademark. EXPOSUREDURABILITY CLASSIFICATION:Exterior. COMMON THICKNESSES:11/32, 3/8, 15/32, 1/2, 19/32, 5/8.

NOTE: Specify Performance Rated Panels bythickness and Span Rating. Span Ratings are basedon panel strength and stiffness. Since theseproperties are a function of panel composition andconfiguration as well as thickness, the same SpanRating may appear on panels of differentthicknesses. Similarly, panels of the same thicknessmay be marked with different Span Ratings.

G U I D E T O A P A P E R F O R M A N C E R A T E D P A N E L STrademarks Shown Are Typical Facsimiles

RATED SHEATHING

000PS 1-83 C-D

PRP-108

APA


32/16 1/2 INCHRATED SHEATHING

32/16

STRUCTURAL 1 RATEDDIAPHRAGMS-SHEAR WALLS

PANELIZED ROOFSPRP-108

APA15/32 INCH

000


RATED SIDING

000PRP-108

HUD-UM-40C

APA

24 oc 15/32 INCH


000PS 1-83 FHA-UM-64

PRP-108

APA




T1-11

RATED STURD-I-FLOOR

000PRP-108

HUD-UM-40C

APA

SIZED FOR SPACING

EXPOSURE 1

20 oc 19/32 INCH

RATED SHEATHING

24/16

000PRP-108

HUD-UM-40C

APA7/16 INCH


APA Rated Sidings include a wide varietyof surface textures and patterns, most ofthem developed for optimum performancewith stain finishes. Typical surface patternsare illustrated and described on pages 10-12. Actual dimensions of groove spacing,width and depth may vary with themanufacturer. Where the characteristics ofa particular wood species are desired,specify by grade and species preference.

In order to help specifiers select themost appropriate siding appearance for aspecific project, APA Rated Siding-303(plywood) is also identified by a gradingsystem. There are four basic sidingclassifications within the system – SpecialSeries 303, 303-6, 303-18 and 303-30.Each class, as shown in the table onpage 12, is further divided into gradesaccording to categories of repair and

appearance characteristics. Depending onspecies, type of repair, finishing, etc., pre-mium appearance products may be foundin all grades. Some grades may be difficultto obtain in some areas. Check with yoursupplier before specifying.

In addition to their primary use as anexterior siding on all kinds of residential,commercial, institutional and industrialstructures, APA Rated Sidings are alsoused for scores of other indoor and out-door applications.

For complete application recommen-dations, write for APA’s Design/Construction Guide: Residential &Commercial, Form E30; for finishingrecommendations, APA Product Guide:Performance Rated Sidings, Form E300;and for manufacturing and gradinginformation, 303 Siding ManufacturingSpecifications, Form B840.

APA TEXTURE 1 -11

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

ROUGH SAWN

Manufactured with a slight, rough-sawntexture running across panel. Availablewithout grooves, or with grooves ofvarious styles; in lap sidings, as well as inpanel form. Generally available in11/32 inch, 3/8 inch, 15/32 inch,1/2 inch, 19/32 inch and 5/8 inch thick-nesses. Rough sawn also available inkerfed (shown) with grooves typically4 inches o.c. in multiples of 2 inches,Texture 1-11, reverse board-and-batten,channel groove and V-groove (15/32 inch,1/2 inch, 19/32 inch, or 5/8 inch thick).Available in Douglas-fir, southern pine,redwood, cedar, and other species.

COM-PLY ®

APA Rated Siding composite panel withrough-sawn veneer faces bonded to solid,reconstituted structural wood core. Avail-able with grooves typically 4 inches or8 inches o.c., similar to Texture 1-11;or 1-1/2 inch-wide grooves spaced12 inches o.c., similar to reverse board-and-batten pattern. Available in 19/32 inch, and5/8 inch thicknesses. Long edges ship-lapped for continuous pattern. Availablewith Douglas-fir or cedar veneer faces.

10

A P A R A T E D S I D I N G S

11

MED IUM DENS I TY

OVERLAY

Available without grooving; withV-grooves (spaced 6 inches or 8 incheso.c. usually standard); or in T1-11 orreverse board-and-batten grooving asillustrated. MDO panel siding available in11/32 inch, 3/8 inch, 15/32 inch,1/2 inch, 19/32 inch, or 5/8 inchthicknesses; also in lap siding. MDOsiding is overlaid on one side and availablewith texture-embossed or smooth surface.

BRUSHED

Brushed or relief-grain textures accentthe natural grain pattern to createstriking surfaces. Generally availablein 11/32 inch, 3/8 inch, 15/32 inch,1/2 inch, 19/32 inch, and 5/8 inchthicknesses. 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 groovespacings available. Shiplapped forcontinuous patterns. Generally available insurface patterns and textures similar toTexture 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 limitedsupply in some areas. Check with your supplierbefore specifying.

APA Texture 1-11 Medium Density Overlay

Rough Sawn Brushed

Com-Ply® Channel Groove

REVERSE

BOARD-AND-BATTEN

Deep, wide grooves cut into brushed,rough sawn, scratch-sanded or othertextured surfaces. Grooves about 1/4 inchdeep, 1 inch to 1-1/2 inches wide, spaced8 inches or 12 inches o.c. with panelthickness of 19/32 inch and 5/8 inch.Provides deep, sharp shadow lines. Longedges shiplapped for continuous pattern.Available in Douglas-fir, southern pine,cedar, redwood and other species.

LAP S ID ING

Rough-sawn or smooth overlaid surfaces,with square or beveled edges. In somecases, lap siding is made of APA RatedSiding-303 panels, cut to lap sidingdimensions. Available in 11/32 inch,3/8 inch, 15/32 inch, 1/2 inch,19/32 inch and 5/8 inch thicknesses.

12

PATCHES

C L A S S G R A D E 5 (1) WOOD SYNTHET IC

303-OC(3) Not permitted Not permittedSpecial 303-OL(4) Not applicable for overlaysSeries 303(2) 303-NR(5) Not permitted Not permitted

303-SR(6) Not permitted Permitted as natural-defect

shape only

303-6-W Limit 6 Not permitted303-6(2) 303-6-S Not permitted Limit 6

303-6-S/W Limit 6 – any combination

303-18-W Limit 18 Not permitted303-18 303-18-S Not permitted Limit 18


303-30-W Limit 30 Not permitted303-30(2) 303-30-S Not permitted Limit 30


(1) Limitations on grade characteristics are based on 4 ft. x 8 ft. panel size. Limits on othersizes vary in proportion. All panels except 303-NR allow restricted minor repairs such asshims. 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 beingmost restrictive and 303-30 being least. Multiple repairs are permitted only on 303-18and 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”

Reverse Board-and-Batten

Lap Siding

RATED SIDING

000PRP-108

HUD-UM-40C

APA

24 oc 15/32 INCH


000PS 1-83 FHA-UM-64

PRP-108

APA




T1-11

000PS 1-83 FHA-UM-64

PRP-108

APA


RATED SIDING303-6-W


RATED SIDING LAP

000PRP-108

HUD-UM-40C

APA

24 oc 7/16 INCH

EXTERIOR

G U I D E T O A P A R A T E D S I D I N G

Trademarks Shown Are

Typical Facsimiles

A P A R A T E D S I D I N G - 3 0 3 F A C E G R A D E S

13

Panels with B-grade or better veneer facesare sanded smooth in manufacture to fulfillthe requirements of their intended end use– applications such as cabinets, shelving,furniture, built-ins, etc. These sandedpanel grades – identified by face and backveneer – are widely used in a multitude ofconstruction, industrial and do-it-yourselfapplications where strength and stiffnesscombined with premium appearance orsurface smoothness is required.

When sanded plywood is manufac-tured with a special plugged inner-plyconstruction to resist dents and punc-tures from concentrated loads, it alsomay be used for nonstructural floorunderlayment as a substrate for vinyl orother resilient flooring. The smooth,sanded surface and excellent dimensionalstability makes these panels ideal for floorunderlayment applications.

Touch-sanded panels – Underlayment,C-C Plugged, and C-D Plugged – aresanded only for “sizing” to assureuniform panel thickness.

Typical sanded and touch-sandedpanel applications are described at right.For complete application recommenda-tions for sanded plywood in industrialapplications, write APA. Industrial useguides are available on MaterialsHandling, Form M200; Slave Pallets,Form S225; and Transport Equipment,Form G210.

NOTE: Exterior sanded panels, C-C Plugged, C-DPlugged and Underlayment grades can also bemanufactured in Structural I (all plies limited toGroup 1 species).

APA A -A

Use where appearance of both sides isimportant for interior applications such asbuilt-ins, cabinets, furniture, partitions;and exterior applications such as fences,signs, boats, shipping containers, tanks,ducts, etc. Smooth surfaces suitable forpainting. EXPOSURE DURABILITYCLASSIFICATIONS: Interior, Exposure 1,Exterior. COMMON THICKNESSES: 1/4,11/32, 3/8, 15/32, 1/2, 19/32, 5/8,23/32, 3/4.

APA A -C

For use where appearance of one side isimportant in exterior applications such assoffits, fences, structural uses, boxcar andtruck linings, farm buildings, tanks, trays,commercial refrigerators, etc.(1)

EXPOSURE DURABILITY CLASSIFICA-TION: Exterior. COMMON THICK-NESSES: 1/4, 11/32, 3/8, 15/32, 1/2,19/32, 5/8, 23/32, 3/4.

APA B -B

Utility panels with two solid sides. EXPO-SURE DURABILITY CLASSIFICATIONS:Interior, Exposure 1, Exterior. COMMONTHICKNESSES: 1/4, 11/32, 3/8, 15/32,1/2, 19/32, 5/8, 23/32, 3/4.

APA A -B

For use where appearance of one side isless important but where two solid sur-faces are necessary. EXPOSURE DURA-BILITY CLASSIFICATIONS: Interior,Exposure 1, Exterior. COMMON THICK-NESSES: 1/4, 11/32, 3/8, 15/32, 1/2,19/32, 5/8, 23/32, 3/4.

APA A -D

For use where appearance of only oneside is important in interior applications,such as paneling, built-ins, shelving,partitions, flow racks, etc.(1) EXPOSUREDURABILITY CLASSIFICATIONS: Inte-rior, Exposure 1. COMMON THICK-NESSES: 1/4, 11/32, 3/8, 15/32, 1/2,19/32, 5/8, 23/32, 3/4.

A P A S A N D E D & T O U C H - S A N D E D P L Y W O O D

GUIDE TO APA-SANDED & TOUCH-SANDED PLYWOOD

Trademark s Shown A re Typ i ca l Fa c s im i l e s

A-A • G-1 • EXPOSURE 1-APA • 000 • PS1-83

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

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

000PS 1-83

APA

EXTERIOR

A-C GROUP 1

A-D

000PS 1-83

APA

GROUP 1

EXPOSURE 1

APA B -C

Utility panel for farm service and workbuildings, boxcar and truck linings,containers, tanks, agricultural equipment,as a base for exterior coatings and otherexterior uses.(1) EXPOSURE DURABILITYCLASSIFICATION: Exterior. COMMONTHICKNESSES: 1/4, 11/32, 3/8, 15/32,1/2, 19/32, 5/8, 23/32, 3/4.

APA C -C PLUGGED(3)

For use as an underlayment over structuralsubfloor, refrigerated or controlled atmos-phere storage rooms, pallet fruit bins,tanks, boxcar and truck floors and linings,and other exterior applications. Providessmooth surface for application of carpetand pad, and possesses high concentratedand impact load resistance. Touch-sanded.For areas to be covered with resilientflooring, specify panels with “sanded face.”EXPOSURE DURABILITY CLASSIFICA-TION: Exterior. COMMON THICK-NESSES(4): 11/32, 3/8, 1/2, 19/32, 5/8,23/32, 3/4.

APA B -D

Utility panel for backing, sides of built-ins, industry shelving, slip sheets, sepa-rator boards, bins and other interior orprotected applications.(1) EXPOSUREDURABILITY CLASSIFICATIONS:Interior, Exposure 1. COMMON THICK-NESSES: 1/4, 11/32, 3/8, 15/32, 1/2,19/32, 5/8, 23/32, 3/4.

APA C -D PLUGGED

For open soffits, built-ins, cable reels,walkways, separator boards and otherinterior or protected applications. Not asubstitute for Underlayment or APA RatedSturd-I-Floor as it lacks their punctureresistance. Touch-sanded. EXPOSUREDURABILITY CLASSIFICATIONS:Interior, Exposure 1. COMMONTHICKNESSES: 3/8, 1/2, 19/32, 5/8,23/32, 3/4.

APA UNDERLAYMENT

For application over structural subfloor.Provides smooth surface for applicationof carpet and pad, and possesses highconcentrated and impact load resistance.Touch sanded. For areas to be coveredwith resilient flooring, specify panels with“sanded face.” (2) EXPOSURE DURA-BILITY CLASSIFICATIONS: Interior,Exposure 1. COMMON THICK-NESSES(4): 1/4, 11/32, 3/8, 1/2, 19/32,5/8, 23/32, 3/4.

(1) For nonstructural floor underlayment, or otherapplications requiring improved inner-ply construc-tion, specify panels marked either “plugged innerplies” (also may be designated plugged crossbandsunder face or plugged crossbands or core); or“meets underlayment requirements.”

(2) Also available in Underlayment A-C or Under-layment B-C grades, marked either “touch sanded”or “sanded face.”

(3) Also may be designated APA UnderlaymentC-C Plugged.

(4) Underlayment and C-C Plugged panels 1/2″and thicker are designated by Span Rating ratherthan species group number in trademark.

14

000PS 1-83

APA

EXTERIOR

B-C GROUP 1

000PS 1-83

APA

INTERIOR

B-D GROUP 2

C-D PLUGGED

000PS 1-83

APA

EXPOSURE 1

GROUP 2

UNDERLAYMENT

000PS 1-83

APA

EXPOSURE 1

GROUP 1

C-C PLUGGED

000PS 1-83

APA

EXTERIOR

GROUP 2

15

APA trademarked specialty grades includepanels designed for specific applications(e.g., B-B Plyform for concrete forming,Marine), or with special surface treat-ments for applications with specificperformance requirements (e.g., Mediumand High Density Overlay, Plyron).

Complete concrete forming design dataare contained in APA’s Concrete Forming,Form V345. For additional information onHigh and Medium Density Overlayplywood, write for HDO/MDO Plywood,Form B360.

GUIDE TO APA

SPEC IALTY PANELS

Trademarks Shown

Are Typical Facsimiles

APA H IGH DENS I TY

OVERLAY (HDO)

Plywood panel manufactured with ahard, semi-opaque resin-fiber overlay onboth sides. Extremely abrasion resistantand ideally suited to scores of punishingconstruction and industrial applications,such as concrete forms, industrial tanks,work surfaces, signs, agricultural bins,exhaust ducts, etc. Also available withskid-resistant screen-grid surface and inStructural I. EXPOSURE DURABILITYCLASSIFICATION: Exterior. COMMONTHICKNESSES: 3/8, 1/2, 5/8, 3/4.

APA MAR INE

Specially designed plywood panel madeonly with Douglas-fir or western larch,solid jointed cores, and highly restrictivelimitations on core gaps and face repairs.Ideal for boat hulls and other marineapplications. Also available with HDO or

MDO faces. EXPOSURE DURABILITYCLASSIFICATION: Exterior. COMMONTHICKNESSES: 1/4, 3/8, 1/2, 5/8, 3/4.

APA B -B PLYFORM

CLASS I

APA proprietary concrete form panelsdesigned for high reuse. Sanded bothsides and mill-oiled unless otherwisespecified. Special restrictions on species.Also available in HDO for very smoothconcrete finish, in Structural I, and withspecial overlays. EXPOSURE DURABILITYCLASSIFICATION: Exterior. COMMONTHICKNESSES: 19/32, 5/8, 23/32, 3/4.

APA MED IUM DENS I TY

OVERLAY (MDO)

Plywood panel manufactured withsmooth, opaque, resin-treated fiber over-lay providing ideal base for paint on oneor both sides. Excellent material choicefor shelving, factory work surfaces,paneling, built-ins, signs and numerousother construction and industrial appli-cations. Also available as APA RatedSiding-303 with texture-embossed orsmooth surface on one side only and inStructural I. EXPOSURE DURABILITY

CLASSIFICATION: Exterior. COMMONTHICKNESSES: 11/32, 3/8, 15/32, 1/2,19/32, 5/8, 23/32, 3/4.

APA DECORAT IVE

Rough sawn, brushed, grooved, or otherfaces. For paneling, interior accent walls,built-ins, counter facing, exhibit displays,etc. Made by some manufacturers inExterior for exterior siding, gable ends,fences and other exterior applications. Userecommendations for Exterior panels vary;check with the manufacturer. EXPOSUREDURABILITY CLASSIFICATIONS:Interior, Exposure 1, Exterior. COMMONTHICKNESSES: 5/16, 3/8, 1/2, 5/8.

APA PLYRON

APA proprietary plywood panel with hard-board face on both sides. Faces tempered,untempered, smooth or screened. Forcountertops, shelving, cabinet doors,concentrated load flooring, etc.EXPOSURE DURABILITY CLASSIFI-CATIONS: Interior, Exposure 1, Exterior.COMMON THICKNESSES: 1/2, 5/8, 3/4.

A P A S P E C I A L T Y P A N E L S

HDO • A-A • G-1 • EXT-APA • 000 • PS1-83

MARINE • A-A • EXT-APA • 000 • PS1-83

000PS 1-83

APA

EXTERIORB-B CLASS I

PLYFORM

M. D. OVERLAY

000PS 1-83

APA

EXTERIOR

GROUP 1

DECORATIVE

000PS 1-83

APA

INTERIOR

GROUP 2

PLYRON • EXPOSURE1-APA • 000

(1) The APA trademarks shown here are typicalexamples only.

(2) For 1/4-inch-thick panels, nail 3 inches o.c. alongpanel edges and 6 inches o.c. each way throughoutremainder of panel with 3d ring-shank nails.

(3) Exposure 1 may be specified for applicationswhere prolonged but temporary exposure to theweather will be required.

(4) Refer to the appropriate applicationrecommendations in APA Design/Construction Guide:Residential & Commercial, E30.

(5) References to APA’s recommendations mayallow subsequent specification concerning nailing,edge support and panel orientation to be omitted.

(6) For areas to be covered with resilient flooring,specify Underlayment or C-C Plugged panel gradesmarked “Sanded Face.” Underlayment A-C,Underlayment B-C, Marine EXT, or sanded plywoodgrades marked “Plugged Crossbands Under Face,”“Plugged Crossbands (or Core),” “Plugged InnerPlies” or “Meets Underlayment Requirements” (ofPS 1-83) may also be used under resilient flooring.

ROUGH CARPENTRY

SECT ION

(CS I D IV I S ION 6 )

A. GENERAL PROVISIONS

1. Identification Requirements – Eachpanel shall be identified with the appro-priate trademark(1) of the APA – TheEngineered Wood Association, and shallmeet the requirements of the latestedition of U.S. Product Standard PS 1 orAPA PRP-108 Performance Standards.2. All panels which have any edge orsurface permanently exposed to theweather shall be classed Exterior.(3)(16)

3. Panel thickness, grade, and Groupnumber or Span Rating shall be at leastequal to that shown on the drawings.(4)

Application shall be in accordance withrecommendations of the APA – TheEngineered Wood Association.(5)

B . ROOF SHEATH ING

1. Panel roof sheathing shall be (specifyappropriate grade):

APA RATED SHEATHING EXP 1 or 2APA RATED SHEATHING EXTAPA STRUCTURAL I

RATED SHEATHING EXP 1, or APA STRUCTURAL I

RATED SHEATHING EXT.

Sheathing permanently exposed toweather shall be classed Exterior.(16)

Install with the long dimension orstrength axis of the panel acrosssupports, except where noted,(7) andwith panel continuous over two ormore spans. For pitched roofs, wearskid-resistant shoes when installing roofsheathing. Place screened surface or sidewith skid-resistant coating up, if orientedstrand board panels are used. Suitableedge support shall be provided whereindicated on drawings (or in recommen-dations of APA – The Engineered WoodAssociation)(4) by use of panel clips,tongue-and-groove edges, or lumberblocking between joists. Panel end jointsshall occur over framing. Spacing of1/8 inch is recommended at panelends and edges, unless otherwiseindicated by the panel manufacturer.

Nail 6 inches o.c. along supported paneledges and 12 inches o.c. at intermediatesupports, except that when supports arespaced 48 inches o.c. or more, space nails6 inches o.c. at all supports.(8) Use 6dcommon nails for panels 1/2 inch and lessand 8d for greater thicknesses, except thatwhen panels are 1-1/8 inches, use 8d ring-shank or 10d common.(10)

Cover roof sheathing as soon as possiblewith roofing felt or shingle underlayment

for protection against excessive moistureprior to roofing application.

C . F LOORS

1. Subflooring (under structural finishfloor such as wood strip or underlay-ment) – Panel subflooring shall be (specifyappropriate grade):

APA RATED SHEATHING EXP 1 or 2APA RATED SHEATHING EXTAPA STRUCTURAL I

RATED SHEATHING EXP 1, or APA STRUCTURAL I

RATED SHEATHING EXT.Install with the long dimension or

strength axis of the panel acrosssupports and with panel continuousover two or more spans. Panel endjoints shall occur over framing. Spacingof 1/8 inch is recommended at panelends and edges, unless otherwiseindicated by the panel manufacturer.

Nail 6 inches o.c. along supportedpanel edges and 12 inches o.c. at inter-mediate supports with 6d commonnails(8) for panels 1/2 inch or less, 8d forgreater thicknesses. Where panels are1-1/8 inches thick and supports are48 inches o.c., nails shall be 8d ring-shank or 10d common and spaced6 inches o.c. at all supports.(10)

16

G U I D E T O S P E C I F I C A T I O N S

RATED SHEATHING

32/16

000PRP-108

HUD-UM-40C

APA15/32 INCH


RATED SHEATHING

40/20

000PS 1-83 C-C

PRP-108

APA19/32 INCH


RATED SHEATHING

48/24

000PS 1-83 C-C

PRP-108

APA23/32 INCH


RATED SHEATHING

24/16

000PRP-108

HUD-UM-40C

APA7/16 INCH


RATED STURD-I-FLOOR

000PS 1-83 C-C PLUGGED

PRP-108

APA


T&G NET WIDTH 47-1/2EXTERIOR

RATED STURD-I-FLOOR

000PRP-108

HUD-UM-40C

APA



17

Sand subfloor joints if necessary tosmooth surface prior to installingunderlayment or finish flooring.2. Combined subfloor-underlayment(under carpet and pad)(17) – Combinedsubfloor-underlayment panels shall be(specify appropriate grade):

APA RATED STURD-I-FLOOR EXP 1 or 2, or

APA RATED STURD-I-FLOOR EXT.Install with the long dimension or

strength axis of the panel across sup-ports and with panel continuous overtwo or more spans. Panel edges shall betongue-and-groove or supported on2-inch lumber blocking installed betweenjoists. Protect against damage until finishfloor is installed.

Stagger panel end joints. Panel endjoints shall occur over framing. Spacingof 1/8 inch is recommended at panelends and edges, unless otherwise indi-cated by the panel manufacturer. Fornailed floors, nail panels 6 inches o.c. atsupported panel edges and 12 inches o.c.at intermediate supports, except thatwhen supports are spaced 48 inches o.c.,space nails 6 inches o.c. at all supports.

Use 6d ring- or screw-shank nails forpanels 3/4 inch thick or less, and 8d forthicker panels. With 1-1/8 inch panels,10d common nails may be used ifsupports are well seasoned.(10)

Fill and thoroughly sand end and edgejoints.(13) Lightly sand any surfaceroughness and around fasteners.

For field-glued floors, use adhesivesmeeting APA Specification AFG-01,applied in accordance with themanufacturer’s recommendations. Iforiented strand board panels with sealedsurfaces and edges are used, use onlysolvent-based glues; check with panelmanufacturer. Apply continuous line ofglue on joists, and continuous or spacedline of glue in groove of tongue-and-groove panels. Use 6d ring- or screw-shank nails spaced 12 inches o.c. atsupported panel edges and intermediatebearings.(11)

3. Underlayment (over subflooring) –Plywood underlayment shall be (specifyappropriate grade)(6):

APA UNDERLAYMENT INTAPA UNDERLAYMENT EXP 1, or APA UNDERLAYMENT C-C

PLUGGED EXT, orAPA C-C PLUGGED EXT.When 19/32 inch or thicker, APA

RATED STURD-I-FLOOR EXP 1 or 2 orAPA RATED STURD-I-FLOOR EXT may bespecified. Apply underlayment just priorto laying finish floor and protect againstdamage until finish floor is installed.

For maximum stiffness, install under-layment panels with the face grain acrosssupports. Stagger end joints (optionalunder carpet and pad) and offset alljoints by at least two inches from jointsof subfloor panels. Butt panel ends andedges to a close but not tight fit(1/32 inch spacing is recommended).Nail 6 inches o.c. along panel edges and8 inches o.c. each way throughoutremainder of panel with 3d ring-shanknails for panel thicknesses of 11/32 inchto 1/2 inch, or 4d spaced 6 inches o.c.along edges and 12 inches o.c. each wayfor thicker panels up to 3/4 inch.(2)(10)

Fastener length should be approximatelyequal to the total thickness of theunderlayment and subfloor.

Fill and thoroughly sand edge and endjoints.(13) Lightly sand any surfaceroughness and around fasteners.

D . WALLS AND SOFF I TS

1. Panel wall sheathing shall be (specifyappropriate grade):

APA RATED SHEATHING EXP 1 or 2APA RATED SHEATHING EXTAPA STRUCTURAL I RATED

SHEATHING EXP 1, orAPA STRUCTURAL I RATED

SHEATHING EXT.

UNDERLAYMENT

000PS 1-83

APA

EXPOSURE 1

GROUP 1

UNDERLAYMENT

000PS 1-83

APA

EXTERIORGROUP 2

C-C PLUGGED

RATED SHEATHINGAPA


000

24/0 3/8 INCH

STRUCTURAL I RATEDDIAPHRAGM-SHEAR WALLS

PRP-108

RATED SHEATHING

000PS 1-83 C-D

PRP-108

APA


32/16 15/32 INCHRATED SIDING

000PRP-108

HUD-UM-40C

APA

24 oc 15/32 INCH


000PS 1-83 FHA-UM-64

PRP-108

APA

EXTERIOR



SIZED FOR SPACING

(7) Long dimension of panel may be parallel tosupports if panel has adequate thickness. See APADesign/Construction Guide: Residential & Commercial,E30 for recommendations.

(8) Engineered shear walls and diaphragms mayrequire additional nailing. See APADesign/Construction Guide: Residential & Commercial,E30 for recommendations.

(9) Hot-dipped or hot-tumbled galvanized steel nailsare recommended for most siding applications. Forbest performance, stainless steel nails or aluminumnails should be considered. APA tests also showthat electrically or mechanically galvanized steelnails appear satisfactory when plating meets orexceeds thickness requirements of ASTM A641Class 2 coatings, and is further protected by yellow

chromate coating. Note: Galvanized fasteners mayreact under wet conditions with the naturalextractives of some wood species and may causestaining if left unfinished. Such staining can beminimized if the siding is finished in accordancewith APA recommendations, or if the roof overhangprotects the siding from direct exposure tomoisture and weathering.

Spacing of 1/8 inch is recommendedat panel ends and edges, unless other-wise indicated by the panel manufacturer.

Nail 6 inches o.c. along supportedpanel edges and 12 inch o.c. at inter-mediate supports with 6d common nailsfor panels 1/2 inch and less, and 8d forgreater thicknesses.(8) Diagonal bracing isnot required, nor is building paper,except under stucco.(4)

2. Siding – Plywood siding shall be(specify appropriate grade and style):(12)

APA RATED SIDING EXT, orAPA MEDIUM DENSITY OVERLAY

(MDO) EXT.Spacing of 1/8 inch is recommended

at panel ends and edges, unless other-wise indicated by the panel manufac-turer. Nail panel siding 6 inches o.c.along panel edges and 12 inches o.c. atintermediate supports with 6d non-staining(9) box, casing or siding nails forpanels 1/2 inch and less, and 8d forgreater thicknesses.(8)

Nail lap siding installed over nailablepanel or lumber sheathing 8 inches o.c.along bottom edge, unless otherwiserecommended by manufacturer. Wheninstalled direct to studs, nail lap siding ateach stud with 6d nonstaining(9) box,casing, or siding nails for siding up to1/2 inch thick, and 8d for thicker panels.

If siding is applied over non-structuralsheathing, use next regular nail size. Use

nonstaining box nails for siding installedover foam insulation sheathing.

Diagonal bracing is not required withpanel siding.

Building paper may be omitted ifvertical joints in plywood panel siding areshiplapped, or covered with battens(except for grooved siding applied hori-zontally), or if siding is installed overpanel sheathing. All panel edges shouldbe sealed. For panels to be painted, sealercan be paint primer; for panels to bestained, sealer should be a water-repellentpreservative compatible with the finish.3. Soffits Soffits shall be (specifyappropriate grade and style):(16)

APA A-C EXTAPA RATED SIDING 303 EXT,(12)

or APA MEDIUM DENSITY OVERLAY(MDO) EXT.

Nail 6 inches o.c. at supported paneledges and 12 inches o.c. at intermediatesupports, with 6d nonstaining(9) box,casing, or siding nails for panels 1/2 inchand less, and 8d for panels up to3/4 inch thick.

E . TREATED PLYWOOD

1. Fire-Retardant-Treated Plywood –All plywood shall be pressure-treated inaccordance with American WoodPreservers Association (AWPA) StandardC27 with an approved (low hygroscopicInterior Type A) (Interior Type B)

(Exterior Type) fire retardant. Each panelshall be labelled or marked by anapproved independent testing agency.After treatment, plywood shall be driedto an average moisture content of15 percent or less.

Plywood shall be all-veneer APA RATEDSHEATHING (or better, depending onappearance desired) EXP 1 or EXT. Note:Span Ratings and load capacities arebased on untreated panels, and may notapply following fire-retardant treatment.Obtain structural performancecharacteristics of FRT panels from thecompany providing the treatment andredrying service.

2. Preservative-Treated Plywood –Treated plywood for (state application)shall be pressure-treated in accordancewith AWPA Standard C9 with (creosote)(pentachlorophenol) (water-borne) preser-vatives, as required for (coastal water)(wood foundation) (ground contact)(above ground) exposure. Plywood treatedwith water-borne preservatives shall bedried after treatment to a moisture contentof 18 percent or less.

18

(10) Other code-approved fasteners may be used.

(11) Major model building codes accept 12 inchesspacing with glue but some local codes may requirecloser spacing. When panels greater than 3/4 inchare used in glued floors, use same fastener scheduleas for nailed-only construction.

(12) See pages 10-12, or for more information, APAProduct Guide: Performance Rated Sidings, E300,and APA Design/Construction Guide: Residential &Commercial, E30.

(13) This step may not be necessary under somecarpet and structural flooring products – checkwith flooring manufacturer.

(14) Design and fabrication specifications forplywood box beams, stressed-skin panels, curvedpanels, sandwich panels and all-plywood beams areavailable from APA.

000PS 1-83 FHA-UM-64

PRP-108

APA




T1-11000

PS 1-83

APA

EXTERIOR

A-C GROUP 1RATED SHEATHING

000PS 1-83 C-D

PRP-108

APA



32/16

000PS 1-83 C-C

PRP-108

APA15/32 INCH


RATED SHEATHING

PS 1-83 C-DPRP-108

APA SERIES V-600

APA


000


PS 1-83 C-CPRP-108

APA SERIES V-611

APA


000

32/16 15/32 INCH

19

All treated plywood used in the Perma-nent Wood Foundation system (PWF)shall be marked by an approvedinspection agency certified to inspectpreservative-treated wood, indicatingcompliance with the treating, drying,retention and penetration requirements ofthe AWPA Standard C22, or equivalentcode-approved preservative-treating andquality control requirements.

Plywood shall be all-veneer APA RATEDSHEATHING (or better, depending onappearance desired) EXP 1 marked APASeries V-600, or EXT marked APA SeriesV-611. Note: For PWF applications,panels marked PS 1 are required.

F . GLUED PLYWOOD

COMPONENTS

1. General – All plywood componentsshall be fabricated in accordance with theappropriate Fabrication Specification.(14)

Each original plywood panel shall bear theappropriate trademark of APA – TheEngineered Wood Association. Glue shall beof resorcinol or phenolic resin base (foroutdoor exposure), or casein with a moldinhibitor (for indoor exposure).

CONCRETE FORMWORK

(CS I D i v i s i on 3 )

A . MATER IALS

1. Forms – Plywood concrete formsshall be (specify appropriate grade):

APA B-B PLYFORM CLASS I EXT,APA HIGH DENSITY OVERLAY

(HDO) PLYFORM CLASS I EXTAPA STRUCTURAL I B-B PLY-FORM

EXT

APA STRUCTURAL I HIGH DENSITY OVERLAY (HDO) PLYFORM EXT, or

APA B-C EXT.Use plywood thickness sufficient to

support concrete at temperature and ratepoured;(15) securely brace and shoreforms to prevent displacement and tosafely support construction loads.

PA INT ING (12)

( CS I D i v i s i on 9 )

A . PREPARAT ION OF

SURFACES

1. Exterior Panels – Panels to beexposed outdoors shall have all edgessealed. With paint, sealer may be a liberalcoat of exterior house paint primer. Withstain, seal with water-repellent preser-vative compatible with finish coat.2. All Panels – Surface shall be clean,dry and free of loose wood fibers. Holesand cracks shall be filled with putty orplastic wood (except for rustic typepanels). After dry, sand lightly in thedirection of the grain of face veneer ortexture to match existing surfaces.

Any tree pitch or sap spots shall befirst touched up with a sealer where thefinish is paint.

B . APPL ICAT ION OF

F IN ISH

(Specify by brush, roller, or spray; brushapplication of the first coat gives bestperformance.)Exterior Panels – Painted First coat:Exterior stain-blocking primer as recom-mended by manufacturer of finish coat.(May be tinted.) Apply quantity asrecommended by paint manufacturer.

Second coat: Top-quality exterior all-acrylic latex house paint designed for usewith primer; color as selected. Twotopcoats provide better performance.Exterior Panels – Stained First coat:Top-quality exterior penetratingsemitransparent oil stain where grainshowthrough is desired(18); or heavilypigmented solid-color oil or latex stainwhere grain is to be masked(19); color asselected. Apply in one or two coats asrecommended by manufacturer.

Use stain-blocking primer with light-colored solid-color latex stains.

Interior Panels – Painted First coat:Stain-blocking primer as recommended bymanufacturer of finish coat.

Second coat: Flat, semi-gloss or glosstopcoat designed for use with primer;color as selected. Use two topcoats ifneeded to cover.

Interior Panels – Color Tone First coat:Stain and companion sealer mixed toselected color (or sealer, then stain appliedseparately).

Second coat: Interior satin varnish(additional coats can be applied asdesired for depth of luster).

Interior Panels – Light Stain First coat:Pigmented resin sealer (wiped off whentacky).

Second coat: Clear resin sealer.Third coat: Tinted undercoat; thin

enamel; pigmented sealer; or light stainapplied thinly and wiped to the desiredcolor depth; color as selected.

Fourth coat: Interior satin varnish(additional coats can be applied asdesired for depth of luster).

(15) Thickness recommendations are containedin APA Design/Construction Guide: ConcreteForming, V345.

(16) Open soffits or roof sheathing exposed on theunderside may be any panel classed Exposure 1where appearance is not a major consideration.

(17) Specify veneer-faced STURD-I-FLOOR with“sanded face” when resilient flooring is to beapplied. Otherwise, an additional layer ofunderlayment is recommended when resilientflooring is to be applied over STURD-I-FLOOR.(See C.3 for recommended grades.)

(18) Semitransparent stains may be used onplywood face grades 303-OC, 303-NR or 303-6-W.Other 303 face grades should not be finished withsemitransparent stains unless specificallyrecommended by the panel manufacturer.

(19) Only latex formulations are recommended onAPA 303-SR and 303-NR grades of plywood siding.

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Like all building materials, APA trade-marked structural wood panels should beproperly stored, handled and installed toassure superior in-service performance.

Protect the edges and ends of panels,especially tongue-and-groove floor and ship-lapped siding panels. Place panels to bemoved by forklift on pallets or bunks whenreceived to avoid damage by fork tines.

Panels to be transported on opentruckbeds should be covered withstandard tarpaulins. For open railcarshipment, use “lumber wrap” to avoidextended weather exposure.

Store panels whenever possible underroof, especially if they won’t be used soonafter received. Keep sanded and otherappearance grades away from opendoorways, and weight down the top panelin a stack to avoid any possible warpagefrom humidity. If moisture absorption isexpected, cut steel banding on panelbundles to prevent edge damage.

Panels to be stored outside should bestacked on a level platform supported by4x4 stringers or other blocking. Neverleave panels or the platform in directcontact with the ground. Use at least threefull-width supports along the eight-footlength of the panel – one centered and theothers 12 to 16 inches from each end.

Cover the stack loosely with plasticsheets or tarps. Anchor the covering atthe top of the stack, but keep it open andaway from the sides and bottom to assuregood ventilation. Tight coverings preventair circulation and, when exposed tosunlight, create a “greenhouse” effectwhich may encourage mold formation.

While APA trademarked structural woodpanels exhibit excellent dimensionalstability, panel edges and ends should bespaced slightly when installed to allowfor any expansion caused by moistureabsorption. Recommended spacings aregiven with the illustrations.

APA Rated Siding, in addition, shouldbe edge sealed (both blind and exposededges) to minimize the possibility ofsurface checking, water staining ormildew. Sealing is easiest when panelsare stacked. Reseal new edges of panelscut to fit. The type of sealantrecommended depends on the finishtreatment to be used on the siding.

Once installed, protect panels as soonas possible. For example, protect sub-flooring by installing and sheathing wallsand roofs; protect roof sheathing withroofing felt or finish roofing material;protect underlayment with plasticsheeting, cardboard or heavy kraft paperprior to intalling finish flooring, etc.Enclosing the structure as quickly aspossible, keeping panels dry beforeattaching other materials (such asunderlayment or finish flooring), andassuring adequate ventilation, particularlyin attics and crawl spaces, can preventmany costly problems and callbacks.

For complete residential and commer-cial application recommendations, seeAPA’s Design/Construction Guide:Residential & Commercial, Form E30.

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Build platform of cull panel and scrap lumber4x4’s for stacking panels.

Nail film to top panel and drape over ends for protection against driving rain. Weight lower end with 2x4.

Lay two 2x4’s on top of stack.

Pad corners with rags.

Stretch film over stack and secure to tie-down stakes.

I N S T A L L A T I O NS T O R A G E A N D H A N D L I N G

Stretch plastic film over platform to blockpassage of ground moisture.

NOTE: For pitched roofs, wear skid-resistant shoes when installing roofsheathing. Place screened surface or side with skid-resistant coating up, iforiented strand board panels are used. Cover sheathing as soon as possiblewith roofing felt for extra protection against excessive moisture prior toroofing application.

aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa a aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa a aaaaaaaaaaaaaaaaaa aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaAPA RATED STURD-I-FLOOR(Single Floor)

APA STURD-I-WALL(APA RATED SIDING Direct to Studs or overNonstructural Wall Sheathing)

APA RATED SIDING OVER APA RATED SHEATHING(Double Wall)

APA RATED SIDING OVER APA RATED SHEATHING(Double Wall)

Carpet and pad

1/8″ spacing isrecommendedat all edge andend joints.

Tongue-&-groove edges (or 2″ lumberblocking between supports)

Stagger end joints

Blocking with squareedge panels

APA RATEDSTURD-I-FLOOR

2x joists, wood I-joistsor floor trusses

Panel spacing (face) 1/8″1/2″ – 3/4″ T&G Joint

NOTE: Provide adequateventilation and use ground

cover vapor retarder in crawlspace. Panels must be dry

before applying finish floor.

APA UNDERLAYMENT OVER APA RATED SHEATHING SUBFLOORING(Double Floor)

OPEN SOFFITS

CLOSED SOFFITS

Resilient tile or sheetflooring, carpet ornonstructural flooring

APA UNDERLAYMENT (specify “sanded face” when finish isresilient flooring)

1/32″ space isrecommended betweenunderlayment butt joints

Stagger end joints in under-layment panels (optionalunder carpet and pad).

APA RATED SHEATHING or board subflooring(subfloor must be dry before laying underlaymentor other finish flooring)

Long dimension

Joint stagger

optional forsubfloor panels

Face grain(plywood)

1/8″ spacing is recommended at all

subflooring edgesand end joints.

APA RATED SHEATHING

APA RATED SHEATHING

Long dimension

Any appropriate grade ofAPA EXT plywood for soffit

Shim at each rafter forflush joint at change ofpanel thickness

Long dimension

Protect edges of Exposure 1or 2 sheathing againstexposure to weather.

Continuous screened ventor louvered vent

1/8″ spacing is recommended atall panel end and edge joints. Support all panel edges.

No diagonal wallbracing required withpanel siding.

Insulation as required andwarm-side vapor retarder.

1/8″ spacing is recommended at all edge and end joints.

APA RATED SIDING

Joints – no building paper required where edges are shiplapped,caulked or battened. If caulking is notused with unbattened square butt joints, treat plywood edges with water repellent.

6″ minimumclearance, siding

to grade

1/8″ spacing isrecommended atall sheathing edgeand end joints.

“Block” horizontaljoints in panelsused for bracing.

Filler strip ifrequired

APA RATED SHEATHINGapplied with longdimension across studs

APA RATED SHEATHING

Long dimension

1/8″ spacing isrecommended at all edge and end joints

Asphalt or wood shinglesor shakes. Follow roofingmanufacturer’srecommendations for roofing felt.

Panel clip or tongue-&-grooveedges if required

Protect edges of Exposure 1and 2 panels against exposureto weather, or use Exteriorpanel starter strip.

6″ minimum clearance,siding to grade

Long dimension

APA RATED SHEATHING applied withlong dimension parallel to studs

APA RATED SIDING spaced as per

STURD-I-WALL

Any appropriate APA Exterior or Exposure 1 panel grade andthickness for desired appearanceand load-carrying capacity.

Some panel grades, thicknesses, SpanRatings, or species may be difficult toobtain in some areas. Check with yoursupplier for availability or include analternate panel in specifications. Standardpanel dimensions are four feet by eightfeet, although some mills also producepanels nine or ten feet or longer.

A D D I T I O N A LI N F O R M A T I O N

For additional information about APAtrademarked panel products or appli-cations, contact the APA – The EngineeredWood Association, PO Box 11700,Tacoma, Washington 98411-0700, orthe nearest APA regional field office listedon the back cover. A complete listing ofother APA product and applicationguides is contained in the Association’sPublications Index, Form B300.

APA PERFORMANCE

RATED PANELS

Designate thickness, APA trademark,grade, Span Rating, exposure durabilityclassification, dimensions, number ofpieces. For example:

15/32″ APA RATED SHEATHING32/16, Exposure 1, 48″ x 96″, 100 pcs.

23/32″ APA RATED STURD-I-FLOOR24 oc, Exterior, 48″(1) x 96″, 100 pcs.(Note “square edge” or “tongue-and-groove” as desired.)

APA RATED S ID INGS

Designate thickness, APA trademark, facegrade (for APA Rated Siding-303), SpanRating, texture, pattern, dimensions,number of pieces. For example:

19/32″ APA RATED SIDING, 303-18-W, 16 oc, rough-sawnTexture 1-11, grooves 4″ oc, 48″ x 96″, 100 pcs. (Notemanufacturer’s trade name if desired.)

APA SANDED AND

TOUCH-SANDED PANELS

Designate thickness, APA trademark,grade, Group number(2), exposure dura-bility classification, dimensions, numberof pieces. For example:

3/8″ APA A-A, Group 1, Exterior,48″ x 96″, 100 pcs.

3/8″ APA Underlayment, Group 1,Exposure 1, 48″ x 96″, 100 pcs.(Note “sanded face” if used underresilient flooring, or see pages 13-14for additional grades.)

CONCRETE FORM

Designate thickness, APA trademark,Class, dimensions, number of pieces. Forexample:

5/8″ APA B-B PLYFORM Class I,48″ x 96″, 100 pcs. (B-B Plyformpanels are manufactured only asExterior panels and are mill-oiledunless otherwise specified.)

OVERLA ID PANELS

Designate thickness, APA trademark,grade, Group number, dimensions,number of pieces. For example:

1/2″ APA MEDIUM DENSITYOVERLAY (MDO), or (APA 303-0LMDO in the case of overlaid panelsproduced under the APA RATEDSIDING-303 manufacturing specifi-cation), Group 1, 48″ x 96″ 100 pcs.(Any special requirements, such asonly one side overlaid, or surfacetexture or weight of surfacing material,should be stated after the standardspecification.)

(1) Most tongue-and-groove panels aremanufactured with a 47-1/2-inch net face width,although manufacturing practices vary. Check withyour supplier.

(2) Underlayment and C-C Plugged panels 1/2″and thicker are span rated and do not containspecies group number in trademark. DesignateSpan Rating.

M E T H O D O F O R D E R I N G G R A D EA V A I L A B I L I T Y

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The APA – The Engineered Wood Associationis a nonprofit trade association whosemember mills produce approximately 80percent of the structural wood panelproducts manufactured in the UnitedStates and a signifcant percentage ofpanels produced in Canada.

Founded in 1933 as the Douglas FirPlywood Association and widely recog-nized today as a leader in the structuralwood panel industry, APA performsnumerous functions and services onbehalf of panel product users, specifiers,dealers, distributors, schools and univer-sities and other key groups.

Among the most important of thesefunctions is quality inspection andtesting. APA maintains five quality testinglaboratories in key producing regions,including a 37,000-square foot researchcenter at Association headquarters inTacoma, Washington.

But quality validation is only one ofAPA’s many functions. We also:

■ Operate the most sophisticatedprogram for basic panel research inthe world.

■ Maintain an international network offield representatives to assist panelproduct users, specifiers, dealers, distrib-utors and other segments of the trade.

■ Conduct informational buyer andspecifier seminars and provide dealer anddistributor sales training.

■ Publish a vast inventory of publi-cations on panel grades, applications,design criteria and scores of other topics.

■ Advertise and publicize panelproduct systems and applications innational trade and consumer magazines.

■ Sponsor annual design competitionsfor architects, builders, students and do-it-yourself home craftsmen.

■ Work to secure acceptance ofstructural wood panel products andapplications by code officials, insuringagencies and lending institutions.

■ Develop and maintain performanceand industry product standards.

■ Conduct in-depth market researchand development programs to identifyand penetrate new panel markets in theU.S. and abroad.

■ Work in conjunction with otherwood product industry organizations onsolutions to problems of commonconcern.

Always insist on panels bearing themark of quality – the APA trademark.Your APA panel purchase or specificationis your highest assurance of quality. It isalso an investment in the many tradeservices and programs that APAundertakes on your behalf.

A B O U T A P A

The product use recommendations in this publication are based on APA – The Engineered Wood Association’s continuingprograms of laboratory testing, product research, and comprehensive field experience. However, because the Associationhas no control over quality of workmanship or the conditions under which engineered wood products are used, it cannotaccept responsibility for product performance or designs as actually constructed. Because engineered wood productperformance requirements vary geographically, consult your local architect, engineer or design professional to assurecompliance with code, construction, and performance requirements.

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We have field representatives in mostmajor U.S. cities and in Canada who canhelp answer questions involving APAtrademarked products. For additionalassistance in specifying APA panelproducts, get in touch with your nearestAPA regional office. Call or write:

Western Region440 Northlake Center, Suite 211Dallas, Texas 75238-4418(214) 348-0643Fax: (214) 348-3424

Eastern Region2130 Barrett Park Drive, Suite 102P.O. Box 440069Kennesaw, Georgia 30144-3681(404) 427-9371Fax: (404) 423-1703

International MarketingDivisionU.S. Headquarters7011 So. 19th St.P.O. Box 11700Tacoma, Washington 98411-0700(206) 565-6600Fax: (206) 565-7265(Offices: Antwerp, Belgium; London,United Kingdom; Madrid, Spain;Hamburg, Germany; Mexico City, Mexico;Tokyo, Japan.) 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 buildingmaterial.

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 laminatedbeams is the right thing to do.

P.O. Box 11700Tacoma, Washington 98411-0700

(206) 565-6600 / Fax (206) 565-7265

Form No. J20G/Revised August 1992/0200

A P AThe Eng ine e r ed Wood As so c i a t i on

grades and specifications - burt forest products...

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