APA - The Engineered Wood Association

Technical Papers

In this section, you'll find Technical Topics which provide recommendations and explanations for a variety of design and construction details. If you want to refine your search, use the keyword search function below.

The product use recommendations in these publications are based on the continuing programs of laboratory testing, product research, and comprehensive field experience of APA - The Engineered Wood Association and Engineered Wood Systems. However, because APA and EWS have no control over quality of workmanship or the conditions under which structural panels and engineered wood products are used, these organizations 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.

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Tecchnical Topics: Wood Structural Panel Sizes

APA's position on wood structural panel sizes. Issued April 2, 2014. (TT-114 - 2 pages)

4/2/2014 Free Tecchnical Topics: Wood Structural Panel Sizes  (PDF Download)
733 K

Technical Topics: Nailed Box Beam Design Example

Box beam design using material mechanics. Issued April 29, 2014. (TT-116 - 3 pages)

4/29/2014 Free Technical Topics: Nailed Box Beam Design Example (PDF Download)
788 K

Technical Note: Formaldehyde and Engineered Wood Products

Addresses concerns related to structural wood panels and explains why plywood and OSB manufactured to Voluntary Product Standard PS 1-07, Structural Plywood and Voluntary Product Standard PS 2, Performance Standard for Wood-Based Structural-Use Panels, have such low emission levels that they are exempt from the leading formaldehyde emission standards and regulations. Revised June 2013. (Form J330 - 7 pages)

6/26/2013 Free Technical Note: Formaldehyde and Engineered Wood Products (PDF Download)
1.0 MB

ANSI 405-2013: Standard for Adhesives for Use in Structural Glued Laminated Timber

This Standard provides minimum requirements to evaluate adhesives for use in structural glued laminated timber. ANSI 405-2013, approved October 3, 2013, is a revision of ANSI 405-2008. Only available as a downloadable PDF. Revised October 2013. (ANSI 405-2013 - 16 pages)

10/31/2013 Free ANSI 405-2013: Standard for Adhesives for Use in Structural Glued Laminated Timber (PDF Download)
762 K

ANSI/APA PRG 320-2012: Standard for Performance-Rated Cross-Laminated Timber

Provides requirements and test methods for qualification and quality assurance for performance-rated CLT, which is manufactured from solid-sawn lumber or structural composite lumber. ANSI/APA PRG 320-2011 also available. Issued November 2012. (PRG 320-2012 - 29 pages)

11/27/2012 Free ANSI/APA PRG 320-2012: Standard for Performance-Rated Cross-Laminated Timber (PDF Download)
760 K

ANSI/APA PRG 320-2011: Standard for Performance-Rated Cross-Laminated Timber

Provides requirements and test methods for qualification and quality assurance for performance-rated CLT, which is manufactured from solid-sawn lumber or structural composite lumber. ANSI/APA PRG 320-2012 also available. Issued December 20, 2011 (PRG 320-2011 - 29 pages)

1/20/2012 Free ANSI/APA PRG 320-2011: Standard for Performance-Rated Cross-Laminated Timber (PDF Download)
924 K

Technical Topics: Allowable Bearing Stress For APA Wood Structural Panels

Results of bearing tests conducted on plywood and OSB specimens of different thicknesses sampled from various mills by APA. Available as downloadable PDF only. Revised January 18, 2013. (Form TT-001 - 3 pages)

1/18/2013 Free Technical Topics: Allowable Bearing Stress For APA Wood Structural Panels (PDF Download)
775 K

Technical Note: Temporary Construction Loads Over I-Joist Roofs and Floors

Provides recommendations for proper placement of heavy loads in a partially completed light-framed structure to prevent damage to the structure and/or injury to the work crew. Only available as a downloadable PDF. Revised July 2012. (Form J735 - 5 pages)

7/17/2012 Free Technical Note: Temporary Construction Loads Over I-Joist Roofs and Floors (PDF Download)
260 K

Technical Note: Buckling of Wood Structural Panel Sheathing

Describes mechanism and construction features that contribute to buckling of wood structural panels. Includes suggestions for correction. Available only as a downloadable PDF. Updated September 2012. (Form D481 - 7 pages)

9/10/2012 Free Technical Note: Buckling of Wood Structural Panel Sheathing (PDF Download)
627 K

Technical Note: Minimizing Buckling of Wood Structural Panels

Form X480 has been discontinued. Please refer to Technical Note: Minimizing Buckling of Wood Structural Panels, Form D481.

APA Product Report PR-L294(C) Nordic Lam™ Nordic Engineered Wood

Nordic Lam™ Black Spruce structural glued laminated timber manufactured to Canadian building codes and specifications. Only available as downloadable PDF. Revised December 21, 2013. (Form PR-L294(C) - 5 pages)

12/21/2013 Free APA Product Report PR-L294(C) Nordic Lam™ Nordic Engineered Wood (PDF Download)
117 K

Technical Topics: APA Engineered Wood I-Joist Floors and Radiant Heat Systems

Technical Topics. Available only as downloadable PDF. Issued April 30, 2013. (TT-113 - 2 pages)

4/30/2013 Free Technical Topics: APA Engineered Wood I-Joist Floors and Radiant Heat Systems (PDF Download)
735 K

Technical Topics: Narrow Garage Wall Bracing for One and Two Story Homes

THIS PUBLICATION HAS BEEN DISCONTINUED. Please refer to Form G440 for more information on this topic. (Form TT-077 - 5 pages)

Technical Topics: Wind Resistance of Wood Structural Panel Sheathed Walls

Comprehensive information for wind resistance of light-framed walls sheathed with plywood or OSB using the methodology of the 2012 IBC, Table 2304.6.1 and the 2012 IRC, Table R602.3(3). Revised June 6, 2012. (Form TT-110 - 8 pages)

6/6/2012 Free Technical Topics: Wind Resistance of Wood Structural Panel Sheathed Walls (PDF Download)
990 K

Technical Topics: Panel Thickness Tolerances and Labeling

Historical derivation of Performance Category expression of panel thickness labeling requirements that that originated in the state of California. Available only as a downloadable PDF file. Revised April 30, 2013. (Form TT-054 - 2 pages)

4/30/2013 Free Technical Topics: Panel Thickness Tolerances and Labeling (PDF Download)
343 K

Technical Topic: Wood Structural Panels for Outdoor Decks

Summary of APA recommendations for plywood panel usage exposed to long-term high-moisture conditions. Available only as a downloadable pdf file. Revised March 23, 2012. (Form TT-008 - 2 pages)

3/23/2012 Free Technical Topic: Wood Structural Panels for Outdoor Decks (PDF Download)
456 K

Technical Topic: Wood Structural Panels for California Division of State Architect Projects

In accordance with California regulations, all projects submitted after January 1, 2009 shall be reviewed under the provisions of the 2007 California Building Code (CBC). Section 2302 of the 2007 CBC recognizes plywood and oriented strand board (OSB) under the definition of Wood Structural Panel. Issued October 9, 2009. Only available as a downloadable PDF file. (Form TT-106 - 2 pages)

10/9/2009 Free Technical Topic: Wood Structural Panels for California Division of State Architect Projects (PDF Download)
496 K

Technical Topics: Rim Board and I-Joist Nail Spacing Recommendations

Complete Title: Technical Topics: Nail Spacing Recommendations for APA EWS Rim Boards® and I-Joists Available only as a downloadable pdf file. Issued April 8, 2010. (Form TT-094 - 2 pages)

4/8/2010 Free Technical Topics: Rim Board and I-Joist Nail Spacing Recommendations (PDF Download)
629 K

Technical Topics: Combustion Byproducts from Wood Structural Panels

Summarizes available information regarding the environmental concerns of burning wood structural products containing adhesives. Issued June 20, 2011 (Form TT-112 - 3 pages)

6/20/2011 Free Technical Topics: Combustion Byproducts from Wood Structural Panels (PDF Download)
316 K

Technical Topics: I-Joist and Rim Board Connections for Conventional Construction

THIS PUBLICATION HAS BEEN DISCONTINUED. Please refer to Form Y250 and Form Z725 for more information on this topic. (Form TT-095)

Technical Topics: Woodpecker Damage to Wood

Discusses possible methods for discouraging woodpeckers. Available only as a downloadable pdf file. Revised January 13, 2012. (Form TT-067 - 2 pages)

1/13/2012 Free Technical Topics: Woodpecker Damage to Wood (PDF Download)
420 K

Technical Topics: Water Vapor Permeance

THIS PUBLICATION HAS BEEN DISCONTINUED. Please refer to Form J450 for more information on this topic. (Form TT-068 - 2 pages)

Technical Topics: Specified Live Loads for Canadian Residential Construction

Recommended specified uniform live load tables for floors and roofs for APA Rated wood structural panel products based on Canadian Standards Association (CSA) 086-09. Note that specified live loads are intended for use in engineered limit states design and are not appropriate for allowable design under U.S. building codes. Available only as a downloadable pdf file. Revised September 2012. (Form TT-069 - 2 pages)

1/18/2012 Free Technical Topics: Specified Live Loads for Canadian Residential Construction (PDF Download)
752 K

Technical Topics: Nailhead Pull-Through Strength of Wood Structural Panels

Summary of nailhead pull-through tests under dry and after 24-hour water soak for plywood and OSB. Available only as a downloadable pdf file. Revised November 21, 2013. (Form TT-070 - 2 pages)

11/21/2013 Free Technical Topics: Nailhead Pull-Through Strength of Wood Structural Panels (PDF Download)
798 K

Technical Topics: Narrow Wall Bracing Using Wood Structural Panel Portal Frames

THIS PUBLICATION HAS BEEN DISCONTINUED. Please refer to Form TT-100 for more information on this topic. (Form TT-073)

Technical Topics: Design Values for APA's Portal Frame in Engineered Applications

THIS PUBLICATION HAS BEEN DISCONTINUED. Please refer to Form TT-100 for more information on this topic. (Form TT-074)

Technical Topics: Effect of Green Lumber Framing on Wood Structural Panel Shear Wall Performance

Discussion of a test program conducted by APA to investigate the effect of constructing shear walls with green framing lumber, then allowing the shear wall assembly to dry before testing. Available only as a downloadable pdf file. Revised August 20, 2013. (Form TT-075 - 2 pages)

8/20/2013 Free Technical Topics: Effect of Green Lumber Framing on Wood Structural Panel Shear Wall Performance (PDF Download)
742 K

Technical Topics: Shear Wall Lumber Framing

Complete title: Shear Wall Lumber Framing: Double 2x's vs. Single 3x's at Adjoining Panel Edges. Evaluation of double 2x framing members as substitutes when single 3x framing members at adjoining panel edges are specified by codes for shear walls. Available only as a downloadable pdf file. Revised January 14, 2007. (Form TT-076 - 1 page)

1/14/2007 Free Technical Topics: Shear Wall Lumber Framing (PDF Download)
163 K

Technical Topics: Suggested Blocking Installation Details for Wood I-Joist Starter Joists

Provides suggested I-Joist blocking details, which may be used when local codes require prescriptive blocking in the space adjacent to starter joists or rim board. Available only as a downloadable pdf file. Revised July 31, 2013. (Form TT-078 - 2 pages)

7/31/2013 Free Technical Topics: Suggested Blocking Installation Details for Wood I-Joist Starter Joists (PDF Download)
1.4 MB

Technical Topics: Wood Grain Visible in Finished Concrete

Discussion of the causes of wood grain impression in concrete and ways to minimize the effect. Available only as a downloadable pdf file. Revised January 21, 2013. (Form TT-093 - 3 pages)

1/21/2013 Free Technical Topics: Wood Grain Visible in Finished Concrete (PDF Download)
803 K

Technical Topics: True (Shear-Free) and Apparent Moduli of Elasticity

This paper explains the relationships among bending deflection, shear deflection, total deflection, apparent modulus of elasticity and true modulus of elasticity in prismatic bending members. Failure to understand which E is being published can lead to unconservative deflection calculations. Discusses laminated veneer lumber LVL, structural composite lumber (SCL), glued laminated timbers (glulams) but the basic concept applies to all wood bending members including panels. Available only as a downloadable pdf file. Revised December 31, 2013. (Form TT-082 - 4 pages)

12/31/2013 Free Technical Topics: True (Shear-Free) and Apparent Moduli of Elasticity (PDF Download)
767 K

Technical Topics: Shear Wall Test Results Comparing 8d Common and 8d Box Nails

Results from full-scale shear-wall tests of the conservative capacities given in ESR-1539. Available only as a downloadable pdf file. Revised January 6, 2013. (Form TT-087 - 2 pages)

1/6/2013 Free Technical Topics: Shear Wall Test Results Comparing 8d Common and 8d Box Nails (PDF Download)
803 K

Technical Topics: Wood Structural Panel Sheathing on Hip Roofs

Installation guidelines for hip-roof panel applications on trusses spaced 24 in. o.c. that address serviceability issues and improve performance. Available only as a downloadable pdf file. Revised December 12, 2012. (Form TT-083 - 2 pages)

12/12/2012 Free Technical Topics: Wood Structural Panel Sheathing on Hip Roofs (PDF Download)
789 K

Technical Topics: Design Values for Glulam Stock Beam Cutoffs

Results of APA test program assessing design stresses of resawn cutoff 24F-V4 glulam beam sections (stock beams). Available only as a downloadable pdf file. Revised October 18, 2010. (Form TT-084 - 2 pages)

10/18/2010 Free Technical Topics: Design Values for Glulam Stock Beam Cutoffs (PDF Download)
367 K

Technical Topics: Allowable Depth-To-Width Ratios for Glulam Beams

Prescriptive lateral-bracing recommendations. Available only as a downloadable pdf file. Revised May 31, 2013. (Form TT-085 - 2 pages)

5/31/2013 Free Technical Topics: Allowable Depth-To-Width Ratios for Glulam Beams (PDF Download)
797 K

Technical Topics: Plywood Floors for Residential Garages

Provides recommendations for residential garage floor systems that can be built with one or two layers of plywood. Available only as a downloadable pdf file. Revised December 18, 2010. (Form TT-071 - 2 pages)

12/18/2010 Free Technical Topics: Plywood Floors for Residential Garages (PDF Download)
325 K

Technical Topics: Mulching Engineered Wood Products: An Alternative to Landfills

This brief paper discusses the benefits of mulching construction-related wood scraps, including glued engineered wood products. Research is cited to show that the jobsite use of mulched, glued engineered wood products has many benefits, including reduced soil erosion and construction costs. The study also shows that this is done with no significant leaching of chemicals into the environment. Available only as a downloadable pdf file. Revised December 31, 2012. (Form TT-098 - 2 pages)

12/31/2012 Free Technical Topics: Mulching Engineered Wood Products: An Alternative to Landfills (PDF Download)
799 K

Technical Topics: Ice Formation in Core Gaps of Texture 1-11 Siding

Results of 1972 study showing that ice formation does not adversely affect a T1-11 panel or its glue bond. Available only as a downloadable pdf file. Revised December 31, 2012. (Form TT-099 - 2 pages)

12/31/2012 Free Technical Topics: Ice Formation in Core Gaps of Texture 1-11 Siding (PDF Download)
737 K

Technical Topic: A Portal Frame With Hold Downs for Wall Bracing or Engineered Applications

Describes the use of portal-frame design in engineered applications, as well as its use as bracing in conventional light-frame construction. Revised April 10, 2014. (Form TT-100 - 3 pages)

4/10/2014 Free Technical Topic: A Portal Frame With Hold Downs for Wall Bracing or Engineered Applications (PDF Download)
775 K

Technical Topics: Laboratory Test of Mold Growth on Wood Adhesives

This paper summarizes the results of mold growth tests on adhesives and resins commonly used in the wood industry. The tests were conducted at Forintek Canada Corporation and sponsored jointly by Forintek, Composite Panel Association and APA. The tests showed that the adhesives commonly used in structural plywood, LVL, wood I-joists, glulam beams, MDF and OSB either did not support mold growth or were susceptible to mold growth at a rate that was similar to that of the reference woods. Revised May 24, 2010. (Form TT-103 - 3 pages)

5/24/2010 Free Technical Topics: Laboratory Test of Mold Growth on Wood Adhesives (PDF Download)
442 K

Technical Topics: Apparent and Shear Free MOE

Explains the difference between Apparent MOE (Eapparent) and Shear-Free MOE (Eshear-free) in glulam beams, where they are used, how to deal with them when designing and how to make meaningful comparisons between the two different types of published values for E. Only available as a downloadable pdf file. Revised May 20, 2010. (Form TT-104 - 1 page)

5/20/2010 Free Technical Topics: Apparent and Shear Free MOE (PDF Download)
363 K

Technical Topics: Collector Design for Bracing in Conventional Construction

Concept, function and design of lateral load collectors as prescribed in both the IBC and IRC. Available only as a downloadable pdf file. Updated June 4, 2010. (Form TT-102 - 5 pages)

6/4/2010 Free Technical Topics: Collector Design for Bracing in Conventional Construction (PDF Download)
593 K

Technical Topics: Wood I-Joist Floors, Firefighters and Fire

A discussion of the durability and safety of wood I-joist floor assemblies in structure fires. It includes APA’s recommendation to increase the fire endurance of all floor-joist assemblies based on the International Building Code. Available only as a downloadable pdf file. Revised May 15, 2012. (Form TT-015 - 4 pages)

5/15/2012 Free Technical Topics: Wood I-Joist Floors, Firefighters and Fire (PDF Download)
544 K

Technical Topic: Connections for Built-up Glulam Beams

Discusses the code requirement for connecting side-by-side glulam beams (sistered) to each other. Explains the reasoning behind this building code requirement and gives guidelines on the proper way to make the connections. Available only as a downloadable pdf file. Revised June 21, 2010. (Form TT-011 - 4 pages)

6/21/2010 Free Technical Topic: Connections for Built-up Glulam Beams (PDF Download)
424 K

Technical Topics: Designing Diaphragms Over Existing Board Floors Or Roofs

Explains briefly the design considerations for installing a wood structural panel diaphragm over existing board sheathing (decking) in floors or roofs. Available only as a downloadable pdf file. Revised September 2012. (Form TT-097 - 3 pages)

9/18/2012 Free Technical Topics: Designing Diaphragms Over Existing Board Floors Or Roofs (PDF Download)
797 K

Technical Topic: Trim Guidelines

It is sometimes advisable to trim the tongue or groove from a T&G panel for proper clearance for attachment to Rim Board. This document explains when to trim and when it may not be necessary. Available only as a downloadable pdf file. Revised November 3, 2010. (Form TT-032 - 1 page)

11/3/2010 Free Technical Topic: Trim Guidelines (PDF Download)
353 K

Technical Topics: APA Wood I-Joists and APA Rim Boards ®

Explains why only APA Rim Boards® should be used with APA wood I-joists and why lumber rim boards should not be used. Available only as a downloadable pdf file. Revised July 19, 2010. (Form TT-022 - 3 pages)

7/19/2010 Free Technical Topics: APA Wood I-Joists and APA Rim Boards <sup>&reg;</sup> (PDF Download)
298 K

Technical Topic: Finishing Glued Laminated Timbers

Discusses recommendations and exceptions for finishing glulam manufactured entirely from solid-sawn lumber. Available only as a downloadable PDF file. Revised November 5, 2011. (Form TT-033 - 2 pages)

11/5/2011 Free Technical Topic: Finishing Glued Laminated Timbers (PDF Download)
448 K

Technical Topic: Requirements for Wall Coverings and Wind Pressures

Reason for International Residential Code wall sheathing requirements with regard to wind pressure. Only available as a downloadable PDF file. Revised January 13, 2012. (Form TT-105 - 2 pages)

1/13/2012 Free Technical Topic: Requirements for Wall Coverings and Wind Pressures (PDF Download)
905 K

Technical Topics: Heavily Loaded Drywall Carts

How to avoid floor panel puncture from drywall carts by consulting PS 2 for minimum concentrated static loads and heavy concentrated loads. Temporary provision of a second layer of floor panels may be needed. Available only as a downloadable pdf file. Revised January 31, 2013. (Form TT-024 - 1 page)

1/31/2013 Free Technical Topics: Heavily Loaded Drywall Carts (PDF Download)
750 K

Technical Topics: APA Rated Siding Applied to Post Frame Structures

Minimum application recommendations for design and specification of columns, girts, blocking and framing connections of panel siding on post frame structures. Available only as a downloadable pdf file. Issued January 6, 2013. (Form TT-023 - 2 pages)

1/6/2013 Free Technical Topics: APA Rated Siding Applied to Post Frame Structures (PDF Download)
781 K

Technical Topics: Weathering Effects On Plywood Siding

Discusses detrimental effects of ultraviolet light and water on plywood siding. Available only as a downloadable pdf file. Revised March 23, 2012. (Form TT-018 - 2 pages)

3/23/2012 Free Technical Topics: Weathering Effects On Plywood Siding (PDF Download)
420 K

Technical Topics: Approximate Engineering Dead Load Weights Of Wood Structural Panels

Tabulated design weight recommendations for engineering calculation of dead loads at typical construction moisture conditions. Available only as a downloadable pdf file. Revised July 14, 2011 (Form TT-019 - 1 page)

7/14/2011 Free Technical Topics: Approximate Engineering Dead Load Weights Of Wood Structural Panels (PDF Download)
320 K

Technical Topics: Burn-Through Resistance of OSB Panels

Fire test results comparing the burn-through resistance of OSB and plywood. Available only as a downloadable pdf file. Revised November 3, 2011. (Form TT-025 - 2 pages)

11/3/2011 Free Technical Topics: Burn-Through Resistance of OSB Panels (PDF Download)
440 K

Technical Topics: Small Cracks in the Flange at Ends of I-Joists

Discussion of the effect of small cracks radiating from a corner of the flange groove on I-joist structural capacities. Available only as a PDF file. Revised May 9, 2011. (Form TT-026 - 1 page)

5/9/2011 Free Technical Topics: Small Cracks in the Flange at Ends of I-Joists (PDF Download)
299 K

Technical Topics: Cross-Face Wood Structural Panels

Discusses wood structural panels with strength axis in the short panel dimension, typically used in panelized roof decks. Available only as a downloadable pdf file. Revised November 20, 2011. (Form TT-027 - 3 pages)

11/20/2011 Free Technical Topics: Cross-Face Wood Structural Panels (PDF Download)
508 K

Technical Topics: Moisture-Related Dimensional Stability

Discusses linear expansion and thickness swell in wood structural panels due to moisture. Available only as a downloadable pdf file. Revised September 7, 2010. (Form TT-028 - 5 pages)

9/7/2010 Free Technical Topics: Moisture-Related Dimensional Stability (PDF Download)
654 K

Technical Topics: Dusting of Concrete Poured Against Plywood Forms

Discusses causes of surface dusting on concrete surface when poured against plywood forms. Also provides tips for prevention and remedial action. Available only as a downloadable pdf file. Revised February 2012. (Form TT-029 - 2 pages)

2/23/2012 Free Technical Topics: Dusting of Concrete Poured Against Plywood Forms (PDF Download)
443 K

Technical Topics: Panel Flitch Beam Design Example

Gives sample properties, capacities and allowable uniform load for "flitch" value. Available only as a downloadable pdf file. Revised November 25, 2013. (Form TT-030 - 2 pages)

11/25/2013 Free Technical Topics: Panel Flitch Beam Design Example (PDF Download)
761 K

Technical Topics: Rx for Flood Damage, How to Assess Water Damage in Plywood and OSB Panels

THIS PUBLICATION HAS BEEN DISCONTINUED. Please refer to Form X501 for more information on this topic. (Form TT-031 - 0 page)

Technical Topics: Design Example for APA Glued Floor System Using APA Rated Sturd-I-Floor Panels

Provides a design example for APA glued floor systems using APA Rated Sturd-I-Floor panels. Panel properties are based on the APA Panel Design Specification and lumber properties are based on the 2012 ANSI/AWC National Design Specification. Available only as a downloadable pdf file. Revised April 30, 2012. (Form TT-036 - 4 pages)

4/30/2012 Free Technical Topics: Design Example for APA Glued Floor System Using APA Rated Sturd-I-Floor Panels (PDF Download)
862 K

Technical Topics: Span Ratings

Description of span rating system for APA RATED SHEATHING, APA RATED STURD-I-FLOOR and APA RATED SIDING panels. Available only as a downloadable pdf file. Revised November 1, 2010. (Form TT-037 - 2 pages)

11/1/2010 Free Technical Topics: Span Ratings (PDF Download)
359 K

Technical Topics: Recommended Design Values for Nail Withdrawal From APA Plywood and OSB

APA's recommended nail withdrawal design values based on results of ASTM D1761 testing. Available only as a downloadable pdf file. Revised July 19, 2010. (Form TT-039 - 2 pages)

7/19/2010 Free Technical Topics: Recommended Design Values for Nail Withdrawal From APA Plywood and OSB (PDF Download)
166 K

Technical Topics: Holes in Blocking Panels Used in Conventional Construction

The placement of holes in the webs of I-joists or Rim Board when used as blocking for lateral restraint of floor and roof joists. Available only as a downloadable pdf file. Revised May 9, 2012. (Form TT-040 - 3 pages)

5/9/2012 Free Technical Topics: Holes in Blocking Panels Used in Conventional Construction (PDF Download)
502 K

Technical Topics: WSP Performance for Federal Motor Vehicle Safety Standard No. 302

Discusses the burn resistance performance of APA structural-use panels in accordance with Federal Motor Vehicle Safety Standard No. 302. Available only as a downloadable pdf file. Revised May 21, 2011. (Form TT-042 - 1 page)

5/21/2011 Free Technical Topics: WSP Performance for Federal Motor Vehicle Safety Standard No. 302 (PDF Download)
296 K

Technical Topics: Marine-Grade Plywood

Describes the specifications for marine-grade plywood. Available only as a downloadable pdf file. Revised March 19 2011. (Form TT-043 - 1 page)

3/19/2011 Free Technical Topics: Marine-Grade Plywood (PDF Download)
346 K

Technical Topics: Mechanical Properties of APA Structural Panels

Tabulated average MOE and MOR values for APA Rated Sheathing. Available only as a downloadable pdf file. Revised March 30, 2011. (Form TT-044 - 1 page)

3/20/2011 Free Technical Topics: Mechanical Properties of APA Structural Panels (PDF Download)
361 K

Technical Topics: Moisture Exposure Recommendations for Wood Structural Panels

Provides recommended bond classification appropriate for end use in-service moisture conditions. Available only as a downloadable pdf file. Revised April 19, 2012. (Form TT-002 - 2 pages)

4/19/2012 Free Technical Topics: Moisture Exposure Recommendations for Wood Structural Panels (PDF Download)
428 K

Technical Topics: Bending Plywood

Recommendations for minimum bending radii. Available only as a downloadable pdf file. Revised February 10, 2012. (Form TT-003 - 2 pages)

2/10/2012 Free Technical Topics: Bending Plywood (PDF Download)
420 K

Technical Topics: APA Building Paper Recommendations for Walls

Reviews recommendations to include building paper or other code-approved weather-resistive or air infiltration barrier material in wall systems. Available only as a downloadable PDF. Revised September 11, 2005. (Form TT-005 - 1 page)

9/11/2005 Free Technical Topics: APA Building Paper Recommendations for Walls (PDF Download)
152 K

Technical Topics: Ceramic Tile Over Wood Structural Panel Floors

Tile Council of North American (TCNA) specifications for WSP floor systems used under ceramic tile, tested in accordance with ASTM C627. Available only as a downloadable PDF. Revised May 1, 2014. (Form TT-006 - 5 pages)

5/1/2014 Free Technical Topics: Ceramic Tile Over Wood Structural Panel Floors (PDF Download)
784 K

Technical Topics: APA Structural-Use Panels Over Concrete Slabs

Recommends three methods for the installation of a wood floor system over a concrete slab: sleepers, rigid foam or direct. Available only as a downloadable pdf file. Revised February 10, 2012. (Form TT-007 - 3 pages)

2/10/2012 Free Technical Topics: APA Structural-Use Panels Over Concrete Slabs (PDF Download)
436 K

Technical Topics: Bond Classification

Descriptive definition of terms related to bond classification, e.g. Exterior and Exposure 1. Available only as a downloadable pdf file. Revised December 14, 2011. (Form TT-009 - 1 page)

12/14/2011 Free Technical Topics: Bond Classification (PDF Download)
496 K

Technical Topics: Flame Spread of APA Performance-Rated Wood Structural Panels

Report on surface burning characteristics (i.e. flame spread and smoke development) of wood structural panels tested in accordance with ASTM E84. Available only as a downloadable pdf file. Revised November 4, 2011. (Form TT-010 - 1 page)

11/4/2011 Free Technical Topics: Flame Spread of APA Performance-Rated Wood Structural Panels (PDF Download)
426 K

Technical Topics: Effect of Overdriven Fasteners On Shear Capacity

Provides suggested guidelines for determining if overdriven fasteners will affect the shear capacity of diaphragm and shear wall construction. Available only as a downloadable pdf file. Revised December 14, 2011. (Form TT-012 - 2 pages)

12/14/2011 Free Technical Topics: Effect of Overdriven Fasteners On Shear Capacity (PDF Download)
438 K

Technical Topics: Wood Structural Panel Identification

Reviews various panel identification markings. Available only as a downloadable pdf file. Revised December 14, 2011. (Form TT-013 - 1 page)

12/14/2011 Free Technical Topics: Wood Structural Panel Identification (PDF Download)
442 K

Technical Topics: Destruction Of Insects During Manufacture Of Wood Structural Panels

Describes various wood structural panel manufacturing processes that result in the eradication of insects. Available only as a downloadable pdf file. Revised March 27, 2012. (Form TT-014 - 2 pages)

3/27/2012 Free Technical Topics: Destruction Of Insects During Manufacture Of Wood Structural Panels (PDF Download)
428 K

Technical Topics: Plywood or OSB

Discusses the standards under which plywood and OSB are qualified and the interchangeability of the two products for their intended end use. Available only as a downloadable pdf file. Revised June 10, 2010. (Form TT-047 - 5 pages)

6/10/2010 Free Technical Topics: Plywood or OSB (PDF Download)
182 K

Technical Topics: Screw Withdrawal from the Face of APA-Trademarked Structural Panels

Discusses interim recommendations for withdrawal capacities of screws from engineered wood products. Available only as a downloadable pdf file. Revised June 16, 2011. (Form TT-051 - 3 pages)

6/16/2011 Free Technical Topics: Screw Withdrawal from the Face of APA-Trademarked Structural Panels (PDF Download)
345 K

Technical Topics: Service Life of Oriented Strand Board (OSB)

Available only as a downloadable pdf file. Revised November 2013. (Form TT-052 - 2 pages)

11/25/2013 Free Technical Topics: Service Life of Oriented Strand Board (OSB) (PDF Download)
763 K

Technical Topics: Wood Structural Panel Shear Wall Deflection Formula

Causitive factors of shear wall deflection with formulas for calculating deflection of diaphragms and shear walls. Available only as a downloadable pdf file. Revised February 28, 2007. (Form TT-053 - 4 pages)

2/28/2007 Free Technical Topics: Wood Structural Panel Shear Wall Deflection Formula (PDF Download)
210 K

Technical Topics: Sized for Spacing Definitions

Discusses the SIZED FOR SPACING notation in the APA trademark stamp and the practice, at the manufacturers' option, of trimming panels up to 1/8" in length and width to encourage proper panel spacing. Available only as a downloadable PDF. Updated February 10, 2012. (Form TT-055 - 1 page)

2/10/2012 Free Technical Topics: Sized for Spacing Definitions (PDF Download)
417 K

Technical Topics: Power-Driven Fastener Considerations

Discusses some common issues encountered when using power-driven fasteners. Available only as a downloadable pdf file. Revised January 13, 2012. (Form TT-056 - 1 page)

1/13/2012 Free Technical Topics: Power-Driven Fastener Considerations (PDF Download)
418 K

Technical Topics: Recommended Uniform Live Loads for PS-1 APA 303 Siding

Complete title: Recommended Uniform Live Loads for PS-1 APA 303 Siding, When Used as Open Soffit or Combined Roof Decking-Ceiling with Long Dimension Perp. to Supports. Available only as a downloadable pdf file. Revised August 30, 2011. (Form TT-021 - 1 page)

8/30/2011 Free Technical Topics: Recommended Uniform Live Loads for PS-1 APA 303 Siding (PDF Download)
319 K

Technical Topics: Slant Nailing

Discusses the practice of driving panel edge nails at a slight angle in shear walls and diaphragms; and the difference between slant nailing and toe-nailing. Available only as a downloadable pdf file. Revised May 31, 2013. (Form TT-058 - 2 pages)

5/31/2013 Free Technical Topics: Slant Nailing (PDF Download)
868 K

Technical Topics: Staining of Concrete Poured Against Plyform

Discusses the causes of concrete staining and provides some possible solutions. Available only as a downloadable pdf file. Revised March 7, 2012. (Form TT-059 - 2 pages)

3/7/2012 Free Technical Topics: Staining of Concrete Poured Against Plyform (PDF Download)
455 K

Technical Topics: APA Performance-Rated Wood Structural Panels as Thermal Barriers

Discussion and recommendation for foam plastic roof insulation over minimum Performance Category 15/32 engineered wood panels that meet the 15-minute thermal barrier requirement.
Available only as a downloadable pdf file. Revised August 1. (Form TT-060 - 1 page)

8/10/2012 Free Technical Topics: APA Performance-Rated Wood Structural Panels as Thermal Barriers (PDF Download)
726 K

Technical Topics: Diaphragm Nail Penetration and 1-5/16 Inch-Thick I-Joist Flanges

Discusses minimum nail penetration required to develop full connection capacity. Available only as a downloadable pdf file. Revised October 1, 2012. (Form TT-061 - 2 pages)

10/1/2012 Free Technical Topics: Diaphragm Nail Penetration and 1-5/16 Inch-Thick I-Joist Flanges (PDF Download)
756 K

Technical Topics: APA Plywood for Aluminum Hydraulic Trench Shoring

APA-trademarked panel recommendations for trench-shoring design. Available only as a downloadable pdf file. Revised March 7, 2011. (Form TT-062 - 4 pages)

3/7/2011 Free Technical Topics: APA Plywood for Aluminum Hydraulic Trench Shoring (PDF Download)
1.2 MB

Technical Topics: Fire Rated Wall Assemblies with OSB & Plywood Wall Sheathing

Discussion of advantages in using IBC and UL recognized OSB and plywood wall assemblies over other products. Available only as a downloadable pdf file. Revised September 20, 2010. (Form TT-063 - 2 pages)

9/20/2010 Free Technical Topics: Fire Rated Wall Assemblies with OSB & Plywood Wall Sheathing (PDF Download)
374 K

Technical Topics: Deflection of Unblocked Wood Structural Panel Diaphragms

Provides interim guidance regarding methods for determining the stiffness of unblocked diaphragms. Available only as a downloadable pdf file. Revised June 9, 2013. (Form TT-064 - 1 page)

6/9/2013 Free Technical Topics: Deflection of Unblocked Wood Structural Panel Diaphragms (PDF Download)
749 K

APA Full-Scale 3D Wall Bracing Tests

Extensive study evaluates how various structural components work as a whole and provides the industry with a better understanding of a house’s true three-dimensional system performance, as well as specific measurements and data for wall bracing methods. Available only as a downloadable PDF. Issued November 2007. (Form T2007-73 - 46 pages)

11/28/2007 Free APA Full-Scale 3D Wall Bracing Tests (PDF Download)
1.5 MB

Joint Research Report: Evaluation of Force Transfer Around Openings

Full Title: Joint Research Report: Evaluation of Force Transfer Around Openings - An Experimental and Analytical Study; USDA Joint Venture Agreement 09-11111133-117. This report contains research results on one of the major design methods concerning wood structural panel (WSP) sheathed shear walls with openings -- force transfer around openings (FTOA). The study was undertaken by a joint effort between APA, the USDA Forest Products Laboratory (FPL), and the University of British Columbia. Issued July 2011. (Form M410 - 149 pages)

7/26/2011 Free Joint Research Report: Evaluation of Force Transfer Around Openings (PDF Download)
28.5 MB

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