Technical Document Library
Research-Backed Guidance for Every Project
Research-Backed Guidance for Every Project
Build A Better Home - A530
This publication describes the primary sources of moisture intrusion in wood wall construction and recommends methods to prevent moisture penetration.
Build A Better Home - A520
This publication details common sources of moisture, preventive measures and design details for multiple foundation types, including slab-on-grade, crawl space and full basement.
Build A Better Home - A535
This publication describes several roof design and weatherproofing methods used to keep water out of a home’s interior.
FAQ - X501
This publication provides guidance about the serviceability of wood structural panels (plywood and OSB) after exposure to high levels of moisture.
Technical Topic - TT-028
This publication discusses linear expansion and thickness swell in wood structural panels due to moisture
Technical Note - R525
This publication provides recommendations for minimizing moisture accumulation in panelized low-slope roof systems in commercial and industrial applications
Technical Topic - TT-002
This publication provides recommended bond classification appropriate for end use in-service moisture conditions.
Technical Topic - TT-111
This publication provides guidance on how to avoid potential moisture problems when using wood structural products with impermeable materials
Technical Note - T350
This publication discusses how to minimize the risk of future wood flooring problems when moisture at the jobsite is an issue
Technical Note - E705
This publication provides recommendations for safe handling and storage of I-joists and LVL, as well as best practices for cut-up at distribution and moisture effects.
Typical Details - DT-BB-7
This detail shows slab-on-grade foundation detail of moisture control layers.
Technical Topic - TT-133
This publication discusses buckling, fastener recommendations, surface flaking, thickness swell, linear expansion and moisture management of OSB wood structural panels
Technical Note - D481
Provides design and construction practices that reduce the potential for buckling of wood structural panel sheathing caused by wood expansion due to increased moisture conditions.
Standards - S350
Performance requirements, adhesive bond performance, panel construction and workmanship, dimensions and tolerances, marking and moisture content of wood structural panels.
Build A Better Home - A525
This publication outlines the characteristics of mold and mildew, the effect they can have on a structure and its inhabitants, and provides methods for prohibiting their growth.
Builder Tip - F455
This publication describes best practices for storage and installation of glued laminated timber (glulam).
Technical Topic - TT-131
This publication provides procedures for adjusting dimensional measurements of laminated veneer lumber (LVL) in compliance with NIST Handbooks 130 and 133.
Technical Note - J450
This publication addresses the water vapor permeance of wood structural panels and vapor retarders and their role in wall-system design
Technical Note - F410
This publication describes mechanism and construction features that contribute to siding buckling
Technical Topic - TT-125
This publication provides guidance on construction of balconies with solid-sawn dimension lumber attached to I-joist floor systems in supplement to Figure 4 of APA form Z725
Technical Note - X485
This publication explains causes of condensation, identifies areas prone to condensation issues, and provides options to control condensation
Technical Topic - TT-007
This publication recommends three methods for the installation of a wood floor system over a concrete slab: sleepers, rigid foam or direct.
Technical Note - R495
This publication discusses decay fungi and how to prevent/minimize degradation of wood through proper design, storage, construction and maintenance
Technical Topic - TT-075
This publication discusses a test program conducted by APA to investigate the effect of constructing shear walls with green framing lumber
Construction Guide - T300
This publication shows correct connections and common connection errors involving glued laminated (glulam) timbers
Typical Details - DT-BB-8
This detail shows two-piece flashing installation at wall penetration.
Builder Tip - M300
This publication contains spacing recommendations for APA Rated Sheathing, APA Rated Sturd-I-Floor® and APA Rated Siding.
Technical Topic - TT-052
This publication provides information about the performance, proper specification and application of oriented strand board (OSB) products.
Technical Note - R280
This publication provides specification and installation recommendations for panel subfloors to be used under hardwood flooring
Technical Topic - TT-033
This publication discusses recommendations and exceptions for finishing glulam manufactured entirely from solid-sawn lumber.
Product Guide - X440
This product guide provides an overview of APA trademarked glulam and discusses design considerations, applications and specification
Technical Guides - V440
This publication provides guidelines on installing wood structural panel subfloors for optimal performance of finished floors.
Technical Note - U425
This publication discusses expansion joint details for buildings with dimensions larger than 80 feet
Technical Topic - TT-022
This publication discusses the structural superiority of using APA Performance Rated Rim Boards with prefabricated wood I-joists rather than sawn lumber rim boards.
Standards - ANSI/APA PRP 210-2024
This ANSI/APA standard provides requirements and test methods for qualification and quality assurance for performance-rated engineered wood siding.
Standards - PRI-400
This standard contains performance criteria, qualification requirements and quality assurance information for APA Performance Rated I-joists used in residential floors.
Standards - PRI-405
This standard contains performance criteria, qualification requirements & quality assurance information for APA Performance Rated I-joists in commercial roof/floor construction.
Technical Guides - S500
This publication describes the stringent product standards required for cross-laminated timber manufactured in North America, which may not be met by imported products
Data File - Y240
This publication provides information on member sizes and layup, design stresses, column design equations and design tables and examples.
Excerpt - E30X-PSS
This publication is an excerpt from the APA Engineered Wood Construction Guide, providing product descriptions and specification recommendations for wood structural panels
Excerpt - E30X-SCL
This publication is an excerpt from the APA Engineered Wood Construction Guide, providing descriptions and specification recommendations for structural composite lumber (SCL)
Technical Note - R475
This publication discusses checking in glulam beams and includes a flowchart and equations for determining allowable check size
Technical Topic - TT-128
This publication discusses the results of a series of CAN/ULC-S102 tests of flame-spread rating (FSR) and smoke developed classification (SDC) for OSB sheathing in Canada
Technical Note - S580
This publication provides a summary of preservatives, treatment recommendations, use, handling and finishing tips for preservative-treated glulam beams
Standards - L870
This publication is the national standard for performance requirements and marking plywood for construction and industrial uses.
Typical Details - DT-BB-9
This detail shows wall-to-foundation connection at brick veneer of base flashing.
Technical Topic - TT-107
This publication answers questions regarding the performance of wood structural panels as air barriers
Standards - PRI-400 CA
This standard details performance criteria, qualification requirements and quality assurance for APA Performance Rated residential I-joists, limit states design, for use in Canada
Technical Guides - E30
This publication provides a comprehensive overview of engineered wood construction systems for residential, commercial and industrial buildings
Technical Guides - Y510
This publication includes section properties, recommended design stresses and design methods for plywood manufactured under Voluntary Product Standard PS 1
Data File - Q220
This publication discusses preservative-treated plywood covering treatment types, use categories, retention levels, fasteners, finishing and safe handling per AWPA standards.
Damage Assessment Report - SP-1182
This report summarizes the findings of a team of engineers who visited the site of a 2017 Texas windstorm to assess the damages sustained by residences