Technical Document Library

Product Guide: Performance Rated Siding Product Guide - E300 Describes the following for performance rated siding: face grades, textures and patterns; finishing; ordering/specifying; basic application recommendations Research Report 138: Plywood Diaphragms Research Report - E315 This publication describes tests of high-load diaphragms with multiple rows of fasteners, glued diaphragms, and diaphragms with openings Research Report 154: Wood Structural Panel Shear Walls Research Report - Q260 This report includes test results of unblocked, stapled and metal-framed shear walls, and a summary of previous shear wall tests. Glulam Product Guide Product Guide - X440 This product guide provides an overview of APA trademarked glulam and discusses design considerations, applications and specification Product Guide: Sanded Plywood Product Guide - K435 This publication describes the specification, advantages, applications and finishing recommendations of sanded plywood and includes trademark examples and explanations Product Guide: HDO/MDO Plywood Product Guide - B360 Describes high density overlay (HDO) and medium density overlay (MDO) plywood applications, properties and characteristics, and shop practice and finishing recommendations APA System Report 102: APA Simplified Wall Bracing Method System Report - SR-102 This report provides an approach to meet the requirements of the 2024, 2021, 2018, 2015 and 2012 IRC simplified wall bracing (Section R602.12). APA System Report 101: Design for Combined Shear and Uplift from Wind System Report - SR-101 This report discusses using wood structural panels to resist uplift from wind, including resistance to lateral shear forces and wind pressure perpendicular to the wall APA System Report 405: Fire Protection of Floors Constructed with Prefabricated Wood I-Joists for Compliance with the International Residential Code System Report - SR-405 This system report provides guidance on fire protection of floors constructed with prefabricated wood I-joist assemblies that comply with 2015, 2018, 2021 and 2024 IRC updates APA System Report 103: Use of Wood Structural Panels for Energy-Heel Trusses System Report - SR-103 This publication outlines a construction solution to meet the IRC’s lateral and wind uplift load requirements using wood structural panels with raised-heel, or energy-heel, trusses Texas Straight-Line Wind Damage Assessment Report 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 Joint Research Report: Evaluation of Force Transfer Around Openings - Experimental and Analytical Studies Research Report - M410 This report contains research results on force transfer around openings (FTAO). This study was a joint effort between APA, the USDA FPL and the UBC. Texas Tornado Damage Assessment Report Damage Assessment Report - SP-1177 This publication contains damage assessments from the December 2015 tornado storm near Dallas, TX, including wind-resistant construction recommendations Quarterly Production Report Q1-26 Market Analysis Reports - QPRO-26 The APA Quarterly Production Report delivers comprehensive, up-to-date data on North American structural wood panel and engineered wood product markets Quarterly Production Report Q2-26 Market Analysis Reports - QPRO-26 The APA Quarterly Production Report delivers comprehensive, up-to-date data on North American structural wood panel and engineered wood product markets Monthly Housing Report Annual Subscription Market Analysis Reports - MHRS-26 Monthly U.S. & Canadian housing market analysis covering starts, permits, home sales, mortgage rates, remodeling, and wood product demand indicators. Annual subscription. Finishing APA Rated Siding Builder Tip - Q350 This publication describes recommended finishes and application recommendations for APA Rated Siding. 303 Siding Manufacturing Specifications Data File - B840 This publication provides minimum requirements that plywood panels must meet to qualify for classification as APA 303 Series specialty siding. R20 Wall—Insulated Siding Typical Details - DT-CWA-4 This detail shows R20 wall assembly with insulated siding (R2 min.), engineered wood or lumber header, wood structural panel sheathing, and R19 compressed fiberglass batts. Buckling of Wood-Based Panel Siding Technical Note - F410 This publication describes mechanism and construction features that contribute to siding buckling Performance Rated Panels Product Guide - F405 This product guide describes performance standards, applications, trademark and performance category information for APA Performance Rated Panels Laboratory Tests Evaluate Design Values of Thermo-Ply® Red Product Advisory - SP-1172 This product advisory contains results of testing to measure the shear wall performance of Thermo-Ply® sheathing Cross-Laminated Timber—North American CLT vs. Imported Product 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 Window Opening Detail—Wood Siding Typical Details - DT-BB-18 This detail shows window head and sill flashing with siding. ESR Joint Evaluation Report - ESR-1301 LP OSB:
LP® SmartSide® and LP® SmartSide® ExpertFinish® Treated-Engineered-Wood Lap, Panel, Shake Lap, Nickel Gap Lap and Vertical Siding Imported Plywood Panels from Brazil Product Advisory - SP-1185 This publication provides test results for imported plywood panels from Brazil, evaluated for conformance to U.S. Product Standard PS 1 Oriented Strand Board Product Guide - W410 This product guide provides an overview of oriented strand board (OSB) and discusses OSB composition, properties, code acceptances and applications Performance of Flexible Structural Sheathing Product Advisory - SP-1186 This publication discusses overstated published lateral load design properties of eight flexible structural sheathing products Z-Flashing Installation—APA Rated Siding Typical Details - DT-BB-19 This detail shows z-flashing installation at horizontal joint between APA panel siding. Voluntary Product Standard PS 1-22, Structural Plywood Standards - L870 This publication is the national standard for performance requirements and marking plywood for construction and industrial uses. ANSI A190.1-2022 Product Standard for Structural Glued Laminated Timber Standards - ANSI A190.1-2022 This ANSI Standard contains requirements for the manufacture and quality control of structural glued laminated timber. California Wildland Urban Interface Approvals for APA Siding Technical Topic - TT-091 Details the layups for APA 303 grooved plywood sidings (T1-11 and reverse board & batten), representing minimal plywood siding constructions as typically found in the marketplace. APA Sturd-I-Wall (Horizontal Panel Siding Installation) Typical Details - DT-EWG-12 This detail shows APA Rated horizontal panel siding applied directly to wall framing in an APA Sturd-I-Wall system. APA Rated Lap Siding Over Wood Structural Panel Sheathing Typical Details - DT-EWG-6 This detail shows APA Rated lap siding installed over wood structural panel sheathing with a weather-resistive barrier on a wood-framed exterior wall assembly. APA Rated Panel Siding Over Wood Structural Panel Sheathing Typical Details - DT-EWG-7 This detail shows APA Rated siding panels applied over wood structural panel sheathing with a weather-resistive barrier on a wood-framed wall assembly. APA Rated Siding Exterior, 5/8" Type X Gypsum Sheathing Typical Details - DT-FR-4 This detail shows a one-hour fire-rated wood-framed wall assembly with Type X gypsum sheathing and wallboard, optional insulation, and APA rated siding exterior finish. Minimum 3/8" APA Rated Siding Exterior Plywood Typical Details - DT-FR-8 This detail shows fire-rated wall assembly detail of 3/8" APA rated plywood siding over Type X gypsum wallboard with optional insulation on 2x4 studs at 16" on center. Green Verification Report - GR-L274 Nordic Structures I-Joists:
Nordic Joist™ Prefabricated Wood I-Joists ANSI/APA PRP 210-2024: Standard for Performance-Rated Engineered Wood Siding 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. Voluntary Product Standard PS 2-18, Performance Standard for Wood Structural Panels Standards - S350 Performance requirements, adhesive bond performance, panel construction and workmanship, dimensions and tolerances, marking and moisture content of wood structural panels. Nail-Base Sheathing for Siding and Trim Attachment Construction Guide Technical Guides - Q250 Determine the type and spacing of siding fasteners to meet building code requirements when using wood structural panel sheathing as a nail base (also called nailable sheathing) Recommended Uniform Live Loads for PS 1 APA 303 Siding Technical Topic - TT-021 Table of recommended uniform live loads for PS 1 APA 303 siding when used as open soffit or combined roof decking-ceiling with long dimension perpendicular to supports. Green Verification Report - GR-L259 Roseburg Forest Products Company I-Joists:
Roseburg RFPI® Series I-Joists Green Verification Report - GR-L289 Roseburg Forest Products Company Rim Board, SCL:
RigidLam® LVL, RigidRim® LVL Rim Board A Guide To Engineered Wood Products Technical Guides - C800 Describes common engineered wood products: plywood, oriented strand board (OSB), I-joist, glued laminated timber (glulam), structural composite lumber (SCL) and rim board. Structural Insulated Panels Product Guide - H650 This publication covers SIP advantages, applications, design and construction considerations, connection details, assembly and related topics. APA Rated Siding Panels Over Rigid Foam Insulation Sheathing Technical Note - C465 This publication provides installation recommendations and test results for energy-saving APA Sturd-I-Wall construction APA Rated Siding Exterior or Other Exterior Finish (Code-Recognized Type), 5/8" Type X Gypsum Sheathing, Minimum 7/16" APA Rated Sheathing Exposure 1 OSB or Plywood Typical Details - DT-FR-3 This detail shows fire-rated exterior wall assembly with APA rated siding over sheathing, insulation, 2x4 wood framing at 16" on center and Type X gypsum wallboard interior finish. APA Rated Siding Exterior or Other Exterior Finish (Code-Recognized Type), 5/8" Type X Gypsum Sheathing, Minimum 15/32" APA Rated Sheathing Exposure 1 OSB or Plywood Typical Details - DT-FR-2 This detail shows a fire-rated wall assembly using wood structural panel sheathing over studs with gypsum wallboard, fire protective membrane, and glass fiber insulation. Minimum 1/2" APA Rated Siding Exterior Plywood, 1" Rigid Foam Insulation Sheathing; Exterior Finish-Elastomeric Coating, 1" Rigid Foam Insulation Sheathing, Minimum 1/2" APA Rated Sheathing Exposure 1 Plywood Typical Details - DT-FR-7 Fire-rated wall assembly of two UL-rated configurations (U330 and U335) with different exterior finishes over wood framing with mineral wool or glass fiber insulation. Sill Flashing at Sliding Glass Door Typical Details - DT-BB-6 This detail shows sill flashing detail at sliding glass door of pan flashing counter-flashing deck flashing and water-resistive barrier. Engineered Wood Products Help Navigate Design Challenges and Tariffs for North Carolina Senior Living Project Case Studies - C440 This case study discusses how engineered wood products helped overcome structural, acoustic and cost challenges at a North Carolina senior living expansion project. APA Product Reports - PR-C302 Roseburg Forest Products Company Plywood:
DuraTemp® Lap and Panel Siding Formaldehyde and Engineered Wood Products Technical Note - J330 This publication addresses concerns related to formaldehyde in engineered wood products and explains their exemption from leading formaldehyde emission standards and regulations. Plywood or OSB? Used as Intended, the Two Products are Interchangable Technical Topic - TT-047 This publication discusses the standards under which plywood and oriented strand board (OSB) are qualified and the interchangeability of the two products, depending on the end use ESR Joint Evaluation Report - ESR-1251 Roseburg Forest Products Company I-Joists:
RFPI® Prefabricated Wood I-Joists APA Product Reports - PR-L259C Roseburg Forest Products Company I-Joists:
Roseburg RFPI® Series I-Joists APA Product Reports - PR-L289 Roseburg Forest Products Company Rim Board, SCL:
RigidLam® LVL and RigidRim® LVL Rimboard APA Product Reports - PR-L289C Roseburg Forest Products Company Rim Board, SCL:
RigidLam® LVL and RigidRim® LVL Rimboard APA Product Reports - PR-L345 Alamco Wood Products, LLC Glulam:
Alamco Structural Glued Laminated Timber APA Product Reports - PR-L349C West Fraser LVL SCL:
West Fraser LVL and LVL Studs APA Product Reports - PR-L259 Roseburg Forest Products Company I-Joists:
Roseburg RFPI® Series I-Joists APA Product Reports - PR-L269 WFP Engineered Products, LLC Glulam, Rim Board:
WFP GL 3000 Glulam and WFP Rim APA Product Reports - PR-L313 Boise Cascade Wood Products, LLC Glulam:
KING BEAM® 3000 and BOISE GLULAM® APA Product Reports - PR-L335 Boise Cascade Wood Products, LLC SCL:
Boise Cascade VersaWorks® Veneer Laminated Timber APA Product Reports - PR-L335C Boise Cascade Wood Products, LLC CLT:
Boise Cascade® Veneer Laminated Timber APA Product Reports - PR-N136 Georgia-Pacific Wood Products LLC OSB:
Georgia-Pacific ForceField® Weather-Resistive Barrier OSB APA Product Reports - PR-S201 Boise Cascade Wood Products, LLC SCL, I-Joists, Rim Board:
BCI® and AJS® I-Joists, and Versa-Lam® Rim Boards (Fire-Rated Assemblies) APA Product Reports - PR-S202 Georgia-Pacific Wood Products LLC Rim Board:
FiberStrong®, GP, and APA Rim Board APA Product Reports - PR-S259 Roseburg Forest Products Company I-Joists, SCL, Rim Board:
Roseburg RFPI® Series I-Joists and RigidRim® LVL Rimboard ESR Joint Evaluation Report - ESR-1040 Boise Cascade Wood Products, LLC SCL:
VERSA-LAM® Laminated Veneer Lumber ESR Joint Evaluation Report - ESR-5157 Boise Cascade Wood Products, LLC CLT, SCL:
Boise Cascade Veneer Laminated Timber APA Product Reports - PR-L263 Canfor Glulam:
Power Beam® and Power Rated Glulam (PRG®) APA Product Reports - PR-L282 Canfor Glulam:
Power Preserved Glulam® Beams and Columns Decay of Engineered Wood Products Customer Service Tip - W505 This publication discusses the causes of fungal decay in wood structural panels and how proper design, construction and maintenance can prevent fungal decay. Mulching Engineered Wood Products: An Alternative to Landfills Technical Topic - TT-098 This publication discusses the benefits of mulching construction-related wood scraps, including glued engineered wood products Deflection Limits in the 2018 IBC for Engineered Wood Products Technical Topic - TT-123 This publication clarifies the applicability of the D+L deflection limits specified in Table 1604.3 of the 2018 IBC, specifically as they pertain to engineered wood products. Applicability of APA Trademarks on Engineered Wood Products Surface-Coated with Fire Protective Coatings Technical Topic - TT-126 Publication answers common questions about fire-protective coatings. Certification and inspection of products with fire-protective coatings are generally outside the scope of APA. Performance Standards and Qualification Policy for Wood Structural Panels Standards - E445 This publication describes requirements and test methods for APA Performance Rated Panels (APA Rated Sturd-I-Floor®, APA Rated Sheathing and APA Rated Siding). Wood Structural Panels Used as Nailable Sheathing Technical Topic - TT-109 This publication discusses how wood structural panels can withstand earthquake, wind, wind suction and pressure loads while permitting the anchorage of lightweight siding materials Vertical Inside and Outside Corner Joints Typical Details - DT-EWG-37 This detail shows vertical corner joint configurations for APA panel and lap siding — butt and caulk, corner board lap joints, and lap siding corners — in horizontal section view. APA Product Reports - PR-N217 Plywood, OSB:
Performance Standards and Qualification Policy for Wood Structural Panels and Performance Standard for 303 Siding APA Product Reports - PR-N124 LP OSB:
LP® SmartSide® and LP® SmartSide® ExpertFinish® Treated-Engineered-Wood Lap Panel, Shake Lap, Nickel Gap Lap, and Vertical Siding APA Product Reports - PR-N140 LP OSB:
LP BuilderSeries® Treated-Engineered-Wood Lap Siding with SmartLock™ Technology Horizontal Beltline Joints Typical Details - DT-EWG-22 This detail shows three horizontal beltline joint configurations for APA panel siding at floor lines in multistory construction. APA Sturd-I-Wall (Vertical Panel Installation) Typical Details - DT-EWG-13 This detail shows APA Rated vertical panel siding applied directly to wall framing in an APA Sturd-I-Wall system with weather-resistive barrier. Horizontal Wall Joints Typical Details - DT-EWG-23 This detail shows three horizontal joint configurations for APA panel siding — butt and flash, lap, and shiplap — each with blocking flatwise or edgewise at the joint location. Single Double I-Joist Blocking Typical Details - DT-IJ-13 This detail shows installation of single or double I-joists to a top plate along an exterior wall and where backer blocks would be required for siding attachment. Vertical Wall Joints Typical Details - DT-EWG-38 This detail shows four vertical joint configurations for APA panel siding butt, shiplap, reverse board and batten, T1-11 and channel groove, and vertical batten. APA Panel Wall Sheathing Typical Details - DT-EWG-5 This detail shows APA Rated wall sheathing applied in two orientations- strength axis across or parallel to studs- with weather-resistive barrier and siding on a wood-framed wall. One-Hour Fire-Rated Exterior Load-Bearing Wall Assembly Typical Details - DT-EWG-30 One-hour fire-rated exterior wall assembly using APA Rated siding, gypsum sheathing, weather-resistive barrier, and Type X gypsum wallboard over 2x4 wood stud framing. R20 Wall—2x4 Framing Typical Details - DT-CWA-1 This detail shows R20 2x4 wall assembly at 16" o.c. with insulated header, insulated siding (R3 min.), insulated corner, R15 cavity insulation, and wood structural panel sheathing. R20 Wall—Insulated Headers Typical Details - DT-CWA-3 This detail shows R20 wall assembly at 24" o.c. with insulated header (R13.8), insulated corner, R21 cavity insulation, and wood structural panel sheathing with wood/vinyl siding. Engineered Wood Construction Guide: Panel Selection and Specification 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 Plywood Design Specification Technical Guides - Y510 This publication includes section properties, recommended design stresses and design methods for plywood manufactured under Voluntary Product Standard PS 1 Engineered Wood Handbook & Grade Glossary Technical Guides - X505 This publication provides a list of engineered wood products and common construction terminology explained in easy-to-understand language. APA Product Reports - PR-E740 Multiple Companies Boise Cascade Wood Products, LLC, Nordic Structures

CLT, Glulam:
Qualified Glulam and CLT Products with Low Formaldehyde Emissions APA Product Reports - PR-L297 Mississippi Laminators, Incorporated Glulam:
Mississippi Laminators Glulam Products APA Product Reports - PR-L233 PWT Rim Board, SCL:
PWT™ Laminated Veneer Lumber and Rim Board APA Product Reports - PR-L233C PWT SCL, Rim Board:
PWT™ Laminated Veneer Lumber and Rim Board APA Product Reports - PR-L238 PWT I-Joists:
PWT™ I-Joists APA Product Reports - PR-L238C PWT I-Joists:
PWT™ I-Joists APA Product Reports - PR-L251 Rosboro Glulam:
Rosboro Structural Glued Laminated Timber APA Product Reports - PR-L261C Interfor I-Joists:
P3 Joist I-Joists APA Product Reports - PR-L274 Nordic Structures I-Joists:
Nordic Structures Prefabricated Wood I-Joists APA Product Reports - PR-L274C Nordic Structures I-Joists:
Nordic Joist™ APA Product Reports - PR-L275 Rosboro Glulam:
Rosboro Treated Glulam APA Product Reports - PR-L283 Murphy Company SCL:
Murphy Laminated Veneer Lumber APA Product Reports - PR-L294 Nordic Structures Glulam:
Nordic Lam™ APA Product Reports - PR-L294C Nordic Structures Glulam:
Nordic Lam™ APA Product Reports - PR-L301 Global LVL Inc. SCL:
Global LVL APA Product Reports - PR-L304 Rosboro Rim Board:
X-RIM Board APA Product Reports - PR-L305 QB Corporation Rim Board, Glulam:
QB Structural Glued Laminated Timber and QB RIM APA Product Reports - PR-L306 Nordic Structures CLT:
Nordic X-Lam APA Product Reports - PR-L306C Nordic Structures CLT:
Nordic X-Lam APA Product Reports - PR-L307 Murphy Company SCL:
Murphy ConBeam LVL APA Product Reports - PR-L312 Murphy Company SCL:
2350Fb-2.0E Murphy LVL Scaffold Planks APA Product Reports - PR-L316 PWT SCL:
PWT™ LVL Scaffold Planks APA Product Reports - PR-L317 Nordic Structures Glulam:
Nordic Lam™ Scaffold Plank APA Product Reports - PR-L319 SmartLam NA Columbia Falls, LLC CLT:
SmartLam Cross-Laminated Timber APA Product Reports - PR-L321 Shelton Structures Inc. Glulam:
Shelton Glulam Columns APA Product Reports - PR-L328 Vaagen Timbers, LLC CLT:
Vaagen Cross-Laminated Timber APA Product Reports - PR-L329 PWT SCL:
PWT™ Preservative-Treated Laminated Veneer Lumber APA Product Reports - PR-L330 IB EWP Inc. I-Joists:
IB Series I-Joists APA Product Reports - PR-L330C IB EWP Inc. I-Joists:
IB Series I-Joists APA Product Reports - PR-L331 Nordic Structures CLT:
Nordic X-Lam Industrial CLT Matting APA Product Reports - PR-L331C Nordic Structures CLT:
Nordic X-Lam Industrial CLT Matting APA Product Reports - PR-L332 Kalesnikoff Mass Timber, Inc. CLT:
Kalesnikoff Cross-Laminated Timber APA Product Reports - PR-L332C Kalesnikoff Mass Timber, Inc. CLT:
Kalesnikoff Cross-Laminated Timber APA Product Reports - PR-L333 Kalesnikoff Mass Timber, Inc. Glulam:
Kalesnikoff Structural Glued Laminated Timber APA Product Reports - PR-L334 West Fraser LVL SCL:
West Fraser LVL Tension Lams APA Product Reports - PR-L336 Rosboro Rim Board:
Rosboro X-Rim+ and X-Rim FRT APA Product Reports - PR-L337 Freres Lumber Co., Inc. CLT:
Freres Industrial MPP Matting APA Product Reports - PR-L338 Zip-O-Laminators, LLC Rim Board:
Zip-Rim APA Product Reports - PR-L339 Element5 Limited Partnership CLT:
Element5 Cross-Laminated Timber APA Product Reports - PR-L339C Element5 Limited Partnership CLT:
Element5 Cross-Laminated Timber APA Product Reports - PR-L340 Resolute Engineered Wood I-Joists:
Resolute RSI I-Joists APA Product Reports - PR-L340C Resolute Engineered Wood I-Joists:
Resolute RSI I-Joists APA Product Reports - PR-L342 AcuTruss Industries 1996 (LTD) I-Joists:
AcuJoist ACJ® Series I-Joists APA Product Reports - PR-L342C AcuTruss Industries 1996 (LTD) I-Joists:
AcuJoist ACJ® Series I-Joists APA Product Reports - PR-L344 Vaagen Timbers, LLC Glulam:
Vaagen Structural Glued Laminated Timber APA Product Reports - PR-L352 D.R. Johnson Wood Innovations Glulam:
DRJ Structural Glued Laminated Timber APA Product Reports - PR-L354 Element5 Limited Partnership Glulam:
Element5 Structural Glued Laminated Timber APA Product Reports - PR-L354C Element5 Limited Partnership Glulam:
Element5 Structural Glued Laminated Timber APA Product Reports - PR-L355 FraserWood Industries Ltd. Glulam:
FraserWood Structural Glued Laminated Timber APA Product Reports - PR-L356 Tolko Industries Ltd. I-Joists:
T-TEC Series I-Joists APA Product Reports - PR-L356C Tolko Industries Ltd. I-Joists:
T-TEC Series I-Joists APA Product Reports - PR-N127 LP OSB:
LP Legacy® Premium Sub-Flooring APA Product Reports - PR-N129 RoyOMartin OSB:
RoyOMartin TuffStrand® and Windbrace® 7/16 Performance Category OSB APA Product Reports - PR-N135 Georgia-Pacific Wood Products LLC OSB:
Georgia-Pacific DryMax® Industrial Panel APA Product Reports - PR-N138 LP OSB:
LP WeatherLogic® Air & Water Barrier APA Product Reports - PR-N139 LP OSB:
LP NovaCore® Thermal Insulated Sheathing APA Product Reports - PR-N141 LP OSB:
Louisiana-Pacific Corporation BURNGUARD™ FRT OSB APA Product Reports - PR-N213 West Fraser Timber Co. Ltd. OSB:
West Fraser Treated OSB APA Product Reports - PR-N216 Tolko Industries Ltd. OSB:
Tolko Zinc-Borate Treated OSB APA Product Reports - PR-N414 West Fraser Timber Co. Ltd. OSB:
West Fraser Concrete Edge Form APA Product Reports - PR-N801 West Fraser Timber Co. Ltd. OSB:
West Fraser Core Stock Panels APA Product Reports - PR-S274 Nordic Structures I-Joists:
Nordic Joist™ Series Prefabricated Wood I-Joists APA Product Reports - PR-S330 IB EWP Inc. I-Joists:
IB Series Prefabricated Wood I-Joists APA Product Reports - PR-S342 AcuTruss Industries 1996 (LTD) I-Joists:
AcuJoist ACJ® Series I-Joists APA Product Reports - PR-V180 Warmboard, Inc. Plywood:
Warmboard-S® Radiant Floor Heating Panels APA Product Reports - PR-L292 Murphy Company SCL:
Murphy T1 and T2 Laminated Veneer Lumber Tension Lams APA Product Reports - PR-N610 Multiple Companies LP, Tolko Industries Ltd., West Fraser Timber Co. Ltd.

OSB:
Qualified OSB Facing Materials for Structural Insulated Panels APA Product Reports - PR-N612 West Fraser Timber Co. Ltd. OSB:
West Fraser 7/16 Proprietary OSB Facers for SIPs APA Product Reports - PR-N614 Tolko Industries Ltd. OSB:
Tolko Proprietary OSB Facers for SIPs APA Product Reports - PR-E720 Multiple Companies Boise Cascade Wood Products, LLC, Murphy Company, PWT, Roseburg Forest Products Company, Tolko Industries Ltd.

SCL:
Structural Composite Lumber (SCL) Qualified for Low Formaldehyde Emissions APA Product Reports - PR-E730 Multiple Companies Boise Cascade Wood Products, LLC, Interfor, Nordic Structures, PWT, Resolute Engineered Wood, Roseburg Forest Products Company

I-Joists:
Qualified Wood I-Joists with Low Formaldehyde Emissions APA Product Reports - PR-E710 Multiple Companies Hardel Mutual Plywood Corporation, Rayonier, Roseburg Forest Products Company, Tolko Industries Ltd.

Plywood, OSB:
Qualified Wood Structural Panels with Low Formaldehyde Emissions ESR Joint Evaluation Report - ESR-1940 Multiple Companies Canfor, WFP Engineered Products, LLC

Glulam:
Glued-Laminated Timber Combinations and the GAP Computer Program Sized for Spacing Technical Topic - TT-055 This publication discusses the SIZED FOR SPACING notation in the APA trademark stamp and the option of trimming panels slightly to encourage proper panel spacing ESR Joint Evaluation Report - ESR-1144 Boise Cascade Wood Products, LLC I-Joists:
AJS Series Prefabricated Wood I-Joists ESR Joint Evaluation Report - ESR-1210 Roseburg Forest Products Company Rim Board, SCL:
RigidLam® Laminated Veneer Lumber (LVL) and RigidRim® LVL Rim Board ESR Joint Evaluation Report - ESR-1336 Boise Cascade Wood Products, LLC I-Joists:
BCI Prefabricated Wood I-Joists ESR Joint Evaluation Report - ESR-1405 Multiple Companies Interfor, IB EWP Inc., Nordic Structures, Resolute Engineered Wood, Roseburg Forest Products Company, Stark Truss Company, Inc.

I-Joists:
Performance Rated I-Joists ESR Joint Evaluation Report - ESR-1618 West Fraser LVL SCL:
West Fraser™ LVL Laminated Veneer Lumber ESR Joint Evaluation Report - ESR-2913 Murphy Company SCL:
Murphy Laminated Veneer Lumber (LVL) ESR Joint Evaluation Report - ESR-1053 West Fraser Timber Co. Ltd. SCL:
1.7E, 1.55E, 1.35E  Durastrand® Laminated Strand Lumber (LSL), 1.5E, 1.3E, 0.8E Durastrand® Oriented Strand Lumber (OSL) ESR Joint Evaluation Report - ESR-1262 Interfor I-Joists:
P3 JOIST PJI-40, PJI-60, PJI-65, PJI-80 and PJI-90 I-Joists ESR Joint Evaluation Report - ESR-1305 PWT I-Joists:
PWT™ I-Joists ESR Joint Evaluation Report - ESR-1742 Nordic Structures I-Joists:
Nordic Joist Prefabricated I-Joists ESR Joint Evaluation Report - ESR-2725 Tolko Industries Ltd. SCL:
T-TEC® LSL, T-TEC® ZB Treated LSL, and T-TEC® LVL ESR Joint Evaluation Report - ESR-2909 PWT Rim Board, SCL:
PWT™ Laminated Veneer Lumber (LVL), PWT™ Treated LVL and PWT™ Rim Boards ESR Joint Evaluation Report - ESR-2919 Stark Truss Company, Inc. I-Joists:
Stark Truss SI-40, SI-60 and SI-80 Series Prefabricated Wood I-Joists ESR Joint Evaluation Report - ESR-3631 OK Laminators, Inc. CLT:
OK Laminators CLT ESR Joint Evaluation Report - ESR-4733 SmartLam NA Columbia Falls, LLC CLT:
SmartLam Cross-Laminated Timber (CLT) ESR Joint Evaluation Report - ESR-4759 Freres Lumber Co., Inc. SCL:
Freres Single Ply Laminated Veneer Lumber ESR Joint Evaluation Report - ESR-4760 Freres Lumber Co., Inc. SCL, CLT:
Freres Mass Ply Panel (MPP) and Mass Ply Lams (MPL) beams and columns ESR Joint Evaluation Report - ESR-4874 Nordic Structures Glulam:
Nordic Lam ESR Joint Evaluation Report - ESR-4875 Nordic Structures CLT:
Nordic X-LAM CLT ESR Joint Evaluation Report - ESR-5815 Vaagen Timbers, LLC Glulam:
Vaagen Structural Glued Laminated Timber APA Product Reports - PR-L260 West Fraser Timber Co. Ltd. SCL:
West Fraser Durastrand® LSL and OSL APA Product Reports - PR-L261 Interfor I-Joists:
PJI Prefabricated Wood I-Joists APA Product Reports - PR-L271 Arizona Structural Laminators, LLC Glulam:
20F, 24F, 26F, 28F and 30F Glulam Beams APA Product Reports - PR-L284 Tolko Industries Ltd. SCL:
Tolko Laminated Strand Lumber (LSL) and Laminated Veneer Lumber (LVL) APA Product Reports - PR-L284C Tolko Industries Ltd. SCL:
Tolko Laminated Strand Lumber (LSL) and Laminated Veneer Lumber (LVL) APA Product Reports - PR-L314 OK Laminators, Inc. CLT:
OK Laminators CLT APA Product Reports - PR-L314C OK Laminators, Inc. CLT:
OK Laminators CLT APA Product Reports - PR-L322 Shelton Structures Inc. Glulam:
Shelton Lock-Deck Laminated Decking APA Product Reports - PR-L324 Freres Lumber Co., Inc. SCL:
Freres LVL APA Product Reports - PR-L325 Freres Lumber Co., Inc. CLT:
Freres Mass Ply Panels (MPP) and Mass Ply Lam (MPL) Beams and Columns APA Product Reports - PR-L325C Freres Lumber Co., Inc. SCL, CLT:
Freres Mass Ply Panels (MPP) and Mass Ply Lam (MPL) Beams and Columns APA Product Reports - PR-L326 SmartLam NA Dothan, LLC. Glulam:
SmartLam NA Dothan Glulam Beams and Columns APA Product Reports - PR-L327 SmartLam NA Dothan, LLC. CLT:
SmartLam NA Dothan Cross-Laminated Timber APA Product Reports - PR-L341 Resolute Engineered Wood I-Joists:
Resolute RSI I-Joists APA Product Reports - PR-L341C Resolute Engineered Wood I-Joists:
Resolute RSI I-Joists APA Product Reports - PR-L346 Zip-O-Laminators, LLC Glulam:
Zip-O-Laminators Glued Laminated Timber APA Product Reports - PR-L347 Mercer Conway CLT:
Mercer Cross-Laminated Timber APA Product Reports - PR-L348 Mercer Conway Glulam:
Mercer Structural Glued Laminated Timber APA Product Reports - PR-L350 WA Enterprises LTD. Glulam:
WA Enterprises Structural Glued Laminated Timber APA Product Reports - PR-L350C WA Enterprises LTD. Glulam:
WA Enterprises Structural Glued Laminated Timber APA Product Reports - PR-L351 OK Laminators, Inc. Glulam:
OK Laminators Structural Glued Laminated Timber APA Product Reports - PR-L351C OK Laminators, Inc. Glulam:
OK Laminators Structural Glued Laminated Timber APA Product Reports - PR-L353 Zip-O-Laminators, LLC Glulam:
Zip-O Laminators Acoustic Sound Panel APA Product Reports - PR-N117 LP OSB:
LP® SmartSide® and LP® SmartSide®  ExpertFinish® Soffit and Rated Sheathing/Ceiling Deck and LP® SmartSide® Soffit and LP® SmartSide®  ExpertFinish Treated-Engineered-Wood Nickel Gap Lap APA Product Reports - PR-N133 West Fraser Timber Co. Ltd. OSB:
West Fraser TallWall/Windstorm/QuakeZone® Rated Sheathing for Use with IRC Energy-Heel Trusses APA Product Reports - PR-N137 RoyOMartin OSB:
RoyOMartin WINDBRACE OSB Sheathing for Combined Shear and Wind Uplift APA Product Reports - PR-N215 West Fraser Timber Co. Ltd. OSB:
West Fraser TruFlor pointSIX SIF OSB and Durastrand pointSIX SIF OSB APA Product Reports - PR-S223 Stark Truss Company, Inc. I-Joists:
SI Series Prefabricated Wood I-Joists APA Product Reports - PR-S238 PWT Rim Board, SCL, I-Joists:
PWT™ I-Joists and PWT™ Laminated Veneer Lumber Rim Boards APA Product Reports - PR-S261 Interfor I-Joists:
PJI Prefabricated Wood I-Joists APA Product Reports - PR-S356 Tolko Industries Ltd. I-Joists:
Tolko T-TEC Series Prefabricated Wood I-Joists (Fire-Rated Assemblies) Engineered Wood Construction Guide: Wall Construction Excerpt - E30X-WC This publication is an excerpt from the APA Engineered Wood Construction Guide, providing application recommendations for APA wood structural panel wall sheathing. Fire-Retardant-Treated Structural Glued Laminated Timber Technical Topic - TT-127 This publication provides a summary of results of an APA/USDA Forest Product Laboratory pilot test program examining structural properties of Fire-Retardant Treated glulam. Builder Tips: Prevent Buckling with Proper Spacing Builder Tip - M300 This publication contains spacing recommendations for APA Rated Sheathing, APA Rated Sturd-I-Floor® and APA Rated Siding. Green Verification Report - GR-L233 PWT SCL, Rim Board:
PWT™ Laminated Veneer Lumber and Rim Board Green Verification Report - GR-L238 PWT I-Joists:
PWT™ I-Joists Green Verification Report - GR-L251 Rosboro Glulam:
Rosboro Structural Glued Laminated Timber Green Verification Report - GR-L294 Nordic Structures Glulam:
Nordic Lam™ Green Verification Report - GR-L306 Nordic Structures CLT:
Nordic X-Lam Green Verification Report - GR-L329 PWT SCL:
PWT™ Preservative-Treated Laminated Veneer Lumber Green Verification Report - GR-L330 IB EWP Inc. I-Joists:
IB Series I-Joists Green Verification Report - GR-L343 Zip-O-Laminators, LLC Glulam, Rim Board:
Zip-O-Laminators Glulam, Zip-Rim Energy-Conserving Wall Assemblies Typical Details - DT-EWG-16 This detail shows two energy-conserving exterior wall assemblies. Data File: APA Rim Board in Fire Rated Assemblies Data File - D350 This publication provides recommendations for the use of APA rim board in conjunction with fire-rated wall/floor assemblies, based on the US Forest Product Laboratory testing Engineered Wood Wall Systems (Canada) Construction Guide - R310 This publication provides an overview of commonly used wall systems and explains how wood structural panels can be used to meet fundamental requirements in wall applications Sustainable Buildings, Sustainable Future Technical Guides - F305 Describes the environmental benefits of engineered wood, compares wood to other structural products and explains scientific research that demonstrates woods green building merits. 2125 Franklin Student Housing Case Studies - S115 This case study explains how glulam beams and engineered wood products shaped 2125 Franklin, a 735-bedroom mixed-use student housing building near the University of Oregon. Burn-Through Resistance of OSB Panels Technical Topic - TT-025 This publication discusses fire test results comparing the burn-through resistance of oriented strand board (OSB) and plywood. FAQs: Questions About Structural Plywood and OSB Performance FAQ - F505 This publication answers questions about structural plywood and OSB panel performance, grade, growth and natural characteristics. Engineered Wood Construction Guide: Floor Construction Excerpt - E30X-FC This publication is an excerpt from the APA Engineered Wood Construction Guide, providing information about floor framing and wood structural panel products Consejos Para Los Constructores: Evite el Pandeo con un Espaciado Adecuado Builder Tip - M300 LA Recomendaciones de espacio entre paneles de clasificación “APA Rated Sheathing,” los pisos de clase Sturd-I-Floor® de APA y los paneles de clasificación “APA Rated Siding." APA Rated Sheathing Specification Guide - SP-1103 This publication provides an overview of the APA trademark and includes a sample specification for APA Rated Sheathing. 2026 Structural Panel & Engineered Wood Yearbook Market Analysis Reports - MKO-E191 Annual analysis of U.S., Canadian, and global economic factors impacting engineered wood demand, with multi-segment forecasts and historical production data. Available as PDF. Energy-Heel Truss Attachment to Sheathing Typical Details - DT-RH-1 This detail shows raised heel energy truss attachment to an exterior wall for additional attic insulation space. I-Joist Fire Assembly with 0.5 inch Gypsum Board Above Flange Typical Details - DT-FPF-4 This detail shows an I-joist floor assembly with 1/2" gypsum board placed above the bottom flange for fire protection per IRC Section R503. I-Joist Fire Assembly with 5/8" inch Gypsum Board Above Flange Typical Details - DT-FPF-5 This detail shows an I-joist floor assembly with 5/8" gypsum board placed above the bottom flange for fire protection per IRC Section R503. I-Joist Fire Assembly with Gypsum Board Typical Details - DT-FPF-2 This detail shows 1/2" gypsum board fastened to the bottom flange of an I-joist floor assembly for fire protection per IRC Section R702.3.1. I-Joist Fire Assembly with Gypsum Board at Bottom Flange Typical Details - DT-FPF-1 This detail shows 1/2" gypsum board or 5/8" wood structural panel installed at the bottom flange of an I-joist floor assembly for fire protection per IRC Section R702.3. I-Joist Fire Assembly with Gypsum Board at Web Holes Typical Details - DT-FPF-3 This detail shows 1/2" gypsum board installed at I-joist web holes for fire protection, shown in two configurations per IRC Section R702.3.1. I-Joist Fire Assembly with Mineral Wool Typical Details - DT-FPF-7 This detail shows an I-joist floor assembly with mineral wool insulation for fire protection per IRC Section R503. I-Joist Fire Assembly with Rockwool Safe'n'Sound Typical Details - DT-FPF-6 This detail shows an I-joist floor assembly with Rockwool Safe'n'Sound mineral wool insulation for fire protection per IRC Section R503. APA Rated Sturd-I-Floor (OSB) Specification Guide - SP-1102 This publication provides an overview of the APA trademark and includes a sample specification for APA Rated Sturd-I-Floor (OSB). APA Rated Sturd-I-Floor (Plywood) Specification Guide - SP-1102 This publication provides an overview of the APA trademark and includes a sample specification for APA Rated Sturd-I-Floor (Plywood). Engineered Wood Gets an Easy A Case Studies - W170 This case study discusses two Washington school districts that creatively leveraged the benefits of exposed wood products in newly constructed schools. Wood Moisture Content and the Importance of Drying in Wood Building Systems Technical Topic - TT-111 This publication provides guidance on how to avoid potential moisture problems when using wood structural products with impermeable materials Destruction of Insects During Manufacture of Wood Structural Panels and Structural Composite Lumber Technical Topic - TT-014 This publication describes various wood structural panel manufacturing processes that result in the eradication of insects Brelsford WSU Visitor Center Case Studies - R130 This case study discusses the Brelsford WSU visitor center’s use of several engineered wood products, including CLT and glulam. APA Wall Bracing Calculator Quick Start Guide Technical Guides - Q230 This guide provides basic instructions for using the APA Wall Bracing Calculator APA Performance-Rated Rim Board - Canadian Limit States Design Technical Guides - W345 CA This publication describes connection requirements and application notes for APA Performance Rated Rim Board for Canadian Limit States Design Glulam Garage Door Headers Offer Design Options Technical Guides - C410 This publication provides connection details and installation recommendations for glulam in residential garage door framing. SIP Eave Detail A Typical Details - DT-SIP-7 This detail outlines the construction of an eave using a SIP, highlighting proper flashing, sealant, and roofing materials. ANSI/APA PRG 320-2025 Standard for Performance-Rated Cross-Laminated Timber Standards - ANSI/APA PRG 320-2025 This ANSI/APA standard provides requirements and test methods for qualification and quality assurance for performance-rated cross-laminated timber (CLT). ANSI/APA PRR 410-2021: Standard for Performance-Rated Engineered Wood Rim Boards Standards - ANSI/APA PRR 410 This standard provides requirements and test methods for qualification and quality assurance for performance rated engineered wood rim board. Panel Thickness Tolerances and Labeling Technical Topic - TT-054 This publication provides guidance on how to comply with NIST panel thickness regulations while still providing for traditional specifications used in the U.S. model building codes Wood Structural Panel Sizes Technical Topic - TT-114 This publication provides APA’s position on wood structural panel sizes concerning panel size listings in ICC-ES ESR-2586. Proper Storage and Handling of I-Joists and LVL 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. APA PRI-400 Performance Standard for Residential I-Joists Standards - PRI-400 This standard contains performance criteria, qualification requirements and quality assurance information for APA Performance Rated I-joists used in residential floors. APA PRI-405 Performance Standard for Commercial I-Joists Standards - PRI-405 This standard contains performance criteria, qualification requirements & quality assurance information for APA Performance Rated I-joists in commercial roof/floor construction. Beveled SIP Wall Typical Details - DT-SIP-1 This detail shows a SIP wall beveled to support a sloped SIP roof that are connected together with panel screws and nails. It also shows sealant, roofing material and cladding. Engineered Wood Construction Guide: Structural Composite Lumber (SCL) Selection and Specification 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) Foam SIP Ridge Cap Detail Typical Details - DT-SIP-2 This detail shows roof SIPs sloped up to form a ridge and connections of the SIPs to framing members with panel screws, while also showing tape, sealant, and roofing materials. Glulam in Residential Building Construction Guide Technical Guides - X450 Describes the selection, specification, design considerations and allowable load tables for APA-trademarked glulam used in residential headers, floor beams and roof beams. Hanging Floor for SIPs Typical Details - DT-SIP-3 This detail shows how to attach a floor system in between the top and bottom of two SIP walls by hanging the joists at the top of a SIP with top mount hangers and a cap plate. Panel Design Specification Technical Guides - D510 This publication describes recommended design capacities (ASD) and design methods for wood structural panels manufactured under PS 1 and PS 2 and APA Performance Standard PRP-108. Rim Board for SIPs Typical Details - DT-SIP-4 This detail shows installation of a floor system between the top and bottom of two SIP walls with the joists directly on top of the SIP with a cap plate and rim board end closure. SIP Block Spline Typical Details - DT-SIP-5 This detail shows a wall-to-wall vertical SIP connection using a block spline and specifies nail size, nail spacing, use of sealant, and an 1/8” expansion gap. SIP Dimensional Lumber Spline Typical Details - DT-SIP-6 This detail shows a wall-to-wall vertical SIP connection using a dimensional lumber spline and specifies nail size, nail spacing, use of sealant, and an 1/8” expansion gap. SIP Foundation Detail C Typical Details - DT-SIP-8 This detail shows a SIP wall assembly being attached to a floor system bearing on a concrete/CMU foundation wall, highlighting proper assembly of wall, floor, and foundation. Wood Structural Panel Identification Technical Topic - TT-013 This publication answers commonly asked questions about identification marks found on wood structural panels Performance Rated I-Joists Design and Construction Guide Construction Guide - Z725 This publication discusses span ratings, installation details, cantilever designs, architectural specifications and engineering design properties for APA Performance Rated I-Joists APA - The Mark of Quality for Wood Structural Panels Technical Guides - X400 This publication explains the APA panel trademark and quality standards for wood structural panels Engineered Wood Construction Guide: Rim Board Selection and Specification Excerpt - E30X-RB This publication is an excerpt from the APA Engineered Wood Construction Guide, providing guidance on selecting and specifying rim board Advanced Framing Construction Guide - M400 This publication explains the components of advanced framing in floor and wall framing, including illustrated construction details APA PRI-400 Performance Standard for Residential I-Joists, Limit States Design for Canada 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 Engineered Wood Construction Guide: I-Joist Selection and Specification Excerpt - E30X-IJ This publication is an excerpt from the APA Engineered Wood Construction Guide, providing a description and specification recommendations for I-joist Flame-Spread Rating for Oriented Strand Board (OSB) Sheathing in Canada 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 Owner's Guide to Understanding Checks in Glued Laminated Timber Technical Guides - F450 This publication addresses common concerns related to checking in glulam and explains how to evaluate if the check effects the glulam’s strength Build a Better Home: Moisture-Resistant Wall Construction 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. APA Performance-Rated Rim Boards Technical Guides - W345 This publication details connection requirements and application notes for APA Performance Rated Rim Board Engineered Wood Sprouts Solutions for Supermarket Chain Case Studies - Z110 This case study discusses how a Sprouts grocery store used engineered wood instead of steel for the roof system to solve supply chain challenges and reduce their carbon footprint. Heavily Loaded Drywall Carts Technical Topic - TT-024 This publication discusses how to avoid floor panel puncture from drywall carts by consulting PS 2 for minimum concentrated static loads and heavy concentrated loads Design of Structural Glued Laminated Timber Columns Data File - Y240 This publication provides information on member sizes and layup, design stresses, column design equations and design tables and examples. Lateral Load Connections for Low-Slope Roof Diaphragms Data File - Z350 This publication describes techniques and products for code-required connections in wood roof systems in high wind and seismic zones. Service Life of Oriented Strand Board (OSB) Sheathing Technical Topic - TT-052 This publication provides information about the performance, proper specification and application of oriented strand board (OSB) products. Glulam Floor Beams Technical Guides - C415 This publication contains span tables for glulam floor beams in residential construction, tables for substituting glulam for steel beams and design details. Holes in Blocking Used in Engineered Wood Construction Technical Topic - TT-040 This publication discusses 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 Load-Bearing Fire-Rated Wall Assemblies with OSB & Plywood Wall Sheathing Technical Topic - TT-063 This publication discusses the advantages of using IBC and UL recognized oriented strand board (OSB) and plywood wall assemblies over other products. Laminated Veneer Lumber Dimension Adjustment Factors for Compliance with NIST Handbook 130 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. Engineered Wood Construction Guide Technical Guides - E30 This publication provides a comprehensive overview of engineered wood construction systems for residential, commercial and industrial buildings Going for Bold: Window Into Affordability Case Studies - X170 This case study discusses how the Las Ventanas affordable housing project used glulam, LVL, OSB and FTAO design principles to cut costs and streamline construction. Shear Transfer at Engineered Wood Floors Data File - Y250 This publication discusses diaphragm perimeter nailing and transfer of shear wall forces from the walls above into the foundation/wall framing. Fire Resistance of Structural Composite Lumber Technical Topic - TT-118 This publication provides a summary of structural composite lumber (SCL) fire performance based on model building codes and research literature. Roof Construction (Canada) Construction Guide - R305 This publication provides specification recommendations for plywood and OSB roof systems and installation recommendations for panel roofs Builder Tips: Keep Glulam Looking Its Best with Proper Storage and Handling Builder Tip - F455 This publication describes best practices for storage and installation of glued laminated timber (glulam). APA Simple Solutions: LVL Beams & Headers Technical Guides - S700 This publication discusses the benefits of using laminated veneer lumber (LVL) beams and headers for window and door framing applications Backer Block Typical Details - DT-IJ-1 This detail outlines backer block installation for single and double I-joist headers. Beam at End Wall Bearing, Nailed Typical Details - DT-GB-1 This detail shows glulam beam bearing at an end wall. The beam is supported by trimmer studs and secured to the king stud with 16d nails. Beam at End Wall with Floor Joist Over Beam Typical Details - DT-GB-3 This detail shows a glulam beam connection to an end wall with I-joists bearing on the beam. Bearing at End Wall, Steel Tie Plate Typical Details - DT-GB-9 This detail shows a steel tie plate connection for a glulam beam bearing on a wood support at an end condition. Continuous Floor Beam Over Wood Support Typical Details - DT-GB-11 This detail shows two connection options for a continuous glulam floor beam bearing on a wood support. Dusting of Concrete Poured Against Plywood Forms Technical Topic - TT-029 This publication discusses causes of surface dusting on concrete surfaces when poured against plywood forms and provides tips for prevention and remedial action. Exemption of Special Inspection on Glulam Based on the 2019 California Building Code Technical Topic - TT-108 This publication clarifies the intent of the California Building Code exemption for special inspection on glulam outlined in Section 1705.5.4 Field Notching and Drilling of Laminated Veneer Lumber Technical Note - G535 This publication provides guidance for notching and drilling on LVL when the end notching and drilling of horizontal through-thickness holes cannot be avoided. Force Transfer Around Openings Shear Walls Typical Details - DT-FTO-1 This detail shows the layout of a force transfer around opening shear wall. I-Joist Cantilever Detail for Balconies Typical Details - DT-IJ-6 This detail outlines proper construction methods for cantilevered I-joist floor extensions, such as balconies. I-Joists Bearing on Floor Beam Typical Details - DT-GB-12 This detail shows I-joists bearing on a glulam floor beam with face nail connections and blocking not shown for clarity. Joists Mounted Flush with Floor Beam Typical Details - DT-GB-13 This detail shows two floor joist flush connections options: one face mounted hanger and one top mounted hanger. Lumber Cantilever Detail for Balconies Typical Details - DT-IJ-7 This detail outlines a construction method for balconies using cantilevered lumber extensions attached to I-joists at their back span. Lumber Joists Bearing on Floor Beams Typical Details - DT-GB-14 This detail shows a cross-section of sawn lumber floor joists secured by toe nails supported by a glulam beam. Mass Timber Has Banks Seeing Green Case Studies - V135 This case study discusses how CLT and glulam helped First United Bank achieve construction and energy efficiencies. Materials Handling Technical Guides - M200 This publication discusses the use of APA-trademarked wood structural panels in materials handling applications including pallets, crates, bins, shelving and mezzanine floors. Open Soffit Typical Details - DT-EWG-31 This detail shows APA Rated sheathing panels installed as an open soffit on exposed roof rafters with weather-protected edges. Preframed Roof Panel 8' x 8' Perpendicular to Supports Typical Details - DT-EWG-32 This detail shows a prefabricated APA wood structural panel roof assembly with purlins installed perpendicular to the supports. Shear Wall Hold-Down Anchor Typical Details - DT-EWG-33 This detail shows a hold down anchor assembly connecting a shear wall to a concrete foundation to resist overturning forces. Two-Stud Inside Corner for Wall Panelization Typical Details - DT-AF-16 This detail shows a two-stud inside corner framing assembly with a panelized/prefabricated wall system. 19/32" T&G APA Plywood Underlayment, 15/32" APA Wood Structural Panel Subfloor, 3-Dimensional Detail Typical Details - DT-FR-1 This detail shows floor assembly of APA wood structural panel subfloor over plywood underlayment, building paper, and joists with gypsum wallboard ceiling below. 4 Best Practices for Glulam Installation Technical Guides - Q705 This publication provides simple steps to proper installation that ensures glulam beams perform as designed. Alternate Insulated Three-Stud Corner (with Drywall Clips) Typical Details - DT-AF-1 This detail shows an alternative insulated 3-stud corner framing assembly with drywall clips to support the gypsum from one stud. Angle Bracket Hanger Typical Details - DT-SPR-1 This detail shows angle bracket hanger assembly for supporting steel sprinkler pipe from wood structural members using blocking and optional fastening methods. APA Glued Floor System Typical Details - DT-EWG-1 This detail shows an APA glued floor system using APA Rated Sturd-I-Floor or sheathing panels. APA Laboratory Testing Capabilities B707 Technical Guides - B707 Learn the APA research facility capabilities, including assembly-level testing of roof and floor building components and performance evaluation of lateral force resisting systems APA Panel Roof Sheathing Typical Details - DT-EWG-2 This detail shows APA Rated sheathing panels installed as roof decking over rafters or trusses with panel clips, asphalt or wood shingles, and proper edge and joint spacing. APA Panel Stair Treads and Risers Typical Details - DT-EWG-3 This detail shows APA panel stair treads and risers installed on stringers in two configurations, using plywood, OSB, or composite panels with 8d common nail fastening. APA Panel Subflooring Typical Details - DT-EWG-4 APA Rated sheathing panels installed as subflooring over 2x joists, I-joists, or floor trusses with tongue-and-groove or blocked edges on a wood-framed floor system. APA Rated Sturd-I-Floor 16, 20, and 24 o.c. Typical Details - DT-EWG-8 This detail shows APA Rated Sturd-I-Floor panel installation at 16", 20", or 24" o.c. joist spacing with tongue-and-groove edges over a floor framing system. APA Rated Sturd-I-Floor 32 and 48 o.c. Typical Details - DT-EWG-9 This detail shows APA Rated Sturd-I-Floor panel installation at 32" or 48" o.c. joist spacing with tongue-and-groove joints over a crawl space floor framing system. APA Rated Sturd-I-Floor 48 o.c. Typical Details - DT-EWG-10 This detail shows APA Rated Sturd-I-Floor 48 o.c. panels installed over a post-and-beam floor framing system with 4x4 posts, 4x girders, and tongue-and-groove panel edges. APA Wood Structural Panels Over Concrete Slabs 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. Apparent and True (shear-free) E Technical Topic - TT-104 This publication explains the difference between apparent modulus of elasticity (MOE) and shear-free MOE in glulam beams Audrain Museum Case Studies - Q125 This case study explains how glulam beams were used to replace the flooring system of the historic Audrian Building, enabling the building to support multi-ton vintage automobiles. Beam at End Wall with Floor Joist Flush with Beam Typical Details - DT-GB-2 This detail shows a glulam beam connection to an end wall with flush floor joists or I-joists connected to the beam. Beams Butting Over Wood Support Typical Details - DT-GB-6 This detail shows two glulam beams butting over a wood support, with the beams connected to the support using a steel post cap and through-bolts. Bearing at End Wall, Steel Post Cap Typical Details - DT-GB-8 This detail shows connection of glulam beam bearing on solid-sawn post or glulam column using steel post cap at end wall condition. Brick Counter Flashing Details Typical Details - DT-BB-2 This detail shows chimney counter flashing detail of base flashing over shingle underlayment and roof deck, with counter flashing embedded in brick mortar joint. Brick Veneer Over APA Panel Sheathing Typical Details - DT-EWG-14 This detail shows brick veneer or masonry cladding installed over APA Rated wood structural panel sheathing. Cantilever Detail for Vertical Building Offset with Double I-Joist Typical Details - DT-IJ-2 This detail shows cantilevered double I-joists supporting a vertical building offset and specifies connections to the top plate, blocking panels, and Rim Board or APA WSP closure. Ceiling Flange Hanger Typical Details - DT-SPR-2 This detail shows ceiling flange hanger installation for supporting steel sprinkler system pipes from engineered wood ceiling joists. Closed Soffit Typical Details - DT-EWG-15 This detail shows a closed soffit assembly using APA rated roof sheathing and exterior panels for the closed soffit with continuous screened or louvered venting. Coach Screw Hanger Typical Details - DT-SPR-3 This detail shows a coach screw hanger assembly for supporting steel sprinkler pipe from wood framing using filler blocks and sheet metal screws or nails. Concrete Masonry Crawl Space Foundation Typical Details - DT-BB-1 This detail shows concrete masonry crawl space foundation. Continuous Beam Over Intermediate Steel Column Typical Details - DT-GB-10 This detail shows two options for connecting a continuous glulam floor beam to an intermediate steel column using either a steel post cap or steel cap plate. Controlling Decay in Wood Construction Technical Note - R495 This publication discusses decay fungi and how to prevent/minimize degradation of wood through proper design, storage, construction and maintenance CPVC Hanger - Double Offset Typical Details - DT-SPR-4 This detail shows double offset CPVC sprinkler pipe hanger assembly using 2x4 blocking with sheet metal screws or nails, supporting 3" maximum diameter pipe per NFPA 13. CPVC Hanger - Face Mount Typical Details - DT-SPR-5 This detail shows two installation options for face-mounting CPVC sprinkler pipe hangers to wood blocking using either sheet metal screws or nail-and-block combinations. CPVC Hanger - Offset Typical Details - DT-SPR-6 This detail shows offset hanger installation for CPVC sprinkler system pipes showing two attachment options using backing nuts or sheet metal screws with lumber blocking. CPVC Hanger in Web Bore Typical Details - DT-SPR-7 This detail shows proper installation of a CPVC sprinkler system pipe hanger through an I-joist web bore, with maximum diameter and load requirements per NFPA 13. Effect of Large Diameter Horizontal Holes on the Bending and Shear Properties of Laminated Veneer Lumber (LVL) Technical Note - V900 This publication supplements APA Form G535, providing an analytical tool in situations when horizontal holes in LVL exceeding the prescriptive guidance in APA G535 are necessary End and Edge Distances, Loaded and Unloaded Typical Details - DT-SPR-8 This detail shows proper bolt spacing requirements including loaded edge distance, unloaded edge distance, end distance, and spacing between rows of bolts. Engineering Solutions for a More Inclusive Community Case Studies - X175 This publication discusses how a California nonprofit incorporated engineered wood into an affordable housing complex to keep costs low and create an inclusive community Exterior Deck Water-Resistive System Typical Details - DT-BB-3 This detail shows exterior deck ledger connection to wood I-joist floor system of water-resistant flashing. Eye Rod Hanger Typical Details - DT-SPR-9 This detail shows eye rod hanger for supporting steel sprinkler pipes from wood framing using filler blocks and sheet metal screws or nails per NFPA 13 requirements. FAQs About Oriented Strand Board Technical Topic - TT-133 This publication discusses buckling, fastener recommendations, surface flaking, thickness swell, linear expansion and moisture management of OSB wood structural panels Flame Spread Index of APA Performance-Rated Wood Structural Panels Technical Topic - TT-010 This publication summarizes surface burning characteristics (flame spread and smoke development) of wood structural panels tested in accordance with ASTM E84 FM Class 1-105 Typical Details - DT-EWG-17 This detail shows an FM Class 1-105 rated flat roof assembly using wood structural panels over open-web trusses. FM Class 1-120 Typical Details - DT-EWG-18 This detail shows an FM Class 1-120 rated flat roof assembly using wood structural panels over steel joists. FM Class 1-135 Typical Details - DT-EWG-19 This detail shows an FM Class 1-135 rated flat roof assembly using wood structural panels. FM Class 1-90 Typical Details - DT-EWG-20 This detail shows an FM Class 1-90 rated flat roof assembly using wood structural panels with foam insulation, fiberboard cover board, and built-up or modified bitumen roofing. Framing Anchor to Backer Block Typical Details - DT-IJ-3 This detail shows installation of backer and filler blocks for a double I-joist header supporting a stair stringer that is attached with a framing anchor. Garage Door Header to End Wall, King Stud Nailed to Beam Typical Details - DT-GH-1 This detail shows a connection of a garage door header at and end wall where a glulam beam is connected to a king stud with nails. Garage Door Header to End Wall, Steel Tie Plate Typical Details - DT-GH-2 This detail shows a connection of a garage door header and an end wall using a steel plate fastened to a solid wood post, glulam column or studs. Glulam or Multi-Structural Composite Lumber Beams Typical Details - DT-IJ-4 This detail shows I-Joists with top mount hangers supported by a multi-ply structural composite lumber (SCL) beam. This detail is similar for a glulam beam with face mount hangers. Heavy Timber Construction Typical Details - DT-EWG-21 This detail shows a heavy timber roof construction assembly using APA Rated Sturd-I-Floor T&G panels over structural glulam or solid timber beams with built-up roofing. I-Joist Blocking Panel Typical Details - DT-IJ-5 This detail shows the installation of PRI blocking panels between I-joists, attached to top plate with face nails for shear transfer at floor sheathing boundaries. Installation of APA Plywood Underlayment Typical Details - DT-EWG-24 This detail shows APA plywood underlayment installation over APA Rated sheathing subfloor. Installation of Stucco Exterior Finish Over Wood Structural Panel Wall Sheathing Data File - Q370 This publication describes recommended wall construction methods for the installation of stucco exterior finish over structural wood panel wall sheathing Insulated Three-Stud Corner (California Corner) Typical Details - DT-AF-2 This detail shows an insulated three-stud outside corner (California corner) framing assembly. Insulated Three-Stud Corner (Inside Corner) Typical Details - DT-AF-3 This detail shows an insulated three-stud inside corner framing assembly. Intersecting Wall Connection Typical Details - DT-AF-4 This detail shows connections of intersecting single 2x top plates with steel plates and alternate lumber splice connections. Jackson Hole Airport Case Studies - R110 This case study explains how glulam beams and Douglas-fir columns helped the Jackson Hole Airport meet strict height limits and seismic demands. Ladder Junction Typical Details - DT-AF-5 This detail shows an advanced framed wall junction with single top plates and 2x ladder blocking spaced vertically at 24” O.C. for an interior wall to exterior wall connection. Large Opening Single Headers Typical Details - DT-AF-6 This detail shows the use of a single header with a width less than the wall to create more space for insulation. Lightweight or Gypsum Concrete Topping, 15/32" APA Wood Structural Panel Subfloor, 3-Dimensional Detail Typical Details - DT-FR-5 This detail shows three-dimensional floor assembly of APA wood structural panel subflooring with gypsum concrete topping over joists and Type X gypsum wallboard ceiling below. Load Carried by Flanges Typical Details - DT-SPR-11 Installation detail for supporting steel sprinkler pipes from structural framing using hanger blocks with fastening specifications for different pipe sizes and loads. Load-Bearing Interior (Chase) Wall System Typical Details - DT-FR-6 Fire-rated load bearing interior chase wall assembly with gypsum wallboard, plywood sheathing, insulation cavity, and 1-inch space between stud walls at 16- or 24-inch centers. Longitudinal Top Plate Splice Typical Details - DT-AF-7 Main and Side Members Typical Details - DT-SPR-12 This detail shows fastener connection between main member (last member penetrated) and side member (first member penetrated) in wood construction. Method ABW – Alternate Braced Wall Typical Details - DT-WB-2 This detail shows the alternate braced wall bracing method and its requirements including sheathing fastening, framing requirements, and foundation anchorage. Method CS-PF - Continuously Sheathed Portal Frame Panel Construction Typical Details - DT-WB-4 This detail shows the wall bracing method continuously sheathed portal frame and its requirements including anchorage, minimum member sizes, and sheathing attachment. Method PFG – Intermittent Portal Frame at Garage Door Openings in SDC A, B and C Typical Details - DT-WB-7 This detail shows the wall bracing method portal frame at a garage and its requirements including sheathing attachment, minimum member sizes, and anchorage. Method PFH – Intermittent Portal Frame with Hold Down Typical Details - DT-WB-9 This detail shows the wall bracing method portal frame with hold down and its requirements including minimum framing sizes, sheathing attachment, hold-downs, and anchorage. Multiple Small-Diameter Holes for Electrical Cables Technical Topic - TT-132 Recommendations for cutting holes in I-joists, LVL and glulam for electrical cables in compliance with the National Electric Code (NEC) and International Residential Code (IRC) Nailer Anchored with Power Driven Fasteners Typical Details - DT-WOM-1 This detail shows wood nailer attachment to steel wide flange beam using drive pins to support APA panel deck, secured with power driven fasteners. NFPA 13 Steel Angle Trapeze with Hanger Typical Details - DT-SPR-13 This detail shows steel angle trapeze hanger system for supporting CPVC or steel sprinkler pipes from wood joists per NFPA 13 requirements with two installation options. Noise-Resistant Floor Assembly Typical Details - DT-EWG-26 This detail shows noise-resistant floor/ceiling assembly using APA Rated sheathing subfloor, lightweight concrete topping, resilient channels, and gypsum wallboard. Noise-Resistant Party Wall Typical Details - DT-EWG-27 This detail shows a noise-resistant wall assembly in plan view using staggered 2x4 studs on 2x6 plates with APA Rated sheathing and gypsum wallboard to reduce sound transmission. Offset Eye-Socket Hanger Typical Details - DT-SPR-14 This detail shows installation of an offset eye-socket hanger supporting a 4-inch steel sprinkler pipe with filler block bearing and fastening requirements. One-Hour Combustible Floor-Ceiling And Roof-Ceiling Assemblies - I-Joists Typical Details - DT-EWG-28 This detail shows one-hour fire-resistive floor/ceiling assemblies using wood I-joists with APA Sturd-I-Floor decking and gypsum wallboard ceiling systems with furring channels. One-Hour Combustible Floor-Ceiling Assemblies - Lumber Joists Typical Details - DT-EWG-29 This detail shows two one-hour fire-rated floor/ceiling assemblies with lumber joists. One-Hour Fire-Rated Glulam Beam (Layup for Simple Span) Typical Details - DT-FR-9 This detail shows cross-section of a one-hour fire-rated glulam beam layup configuration with compression lams at top, core lams in center, and tension lams at bottom. One-Hour Load-Bearing Exterior Wall System, 2x6 Studs @ 16" o.c. Typical Details - DT-FR-10 This detail shows a one-hour fire-rated load bearing exterior wall assembly using 2x6 wood studs at 16 inches on center with Type X gypsum wallboard on both sides. One-Hour Load-Bearing Interior Wall System, 2x4 Studs @ 16" o.c. Typical Details - DT-FR-11 One-hour fire-rated interior partition wall assembly with 2x4 wood studs at 16” o.c., 3-1/2-inch mineral wool insulation, and 5/8-inch Type X gypsum wallboard on both sides. One-Hour Load-Bearing Interior Wall System, 2x6 Studs @ 16" o.c. Typical Details - DT-FR-12 This detail shows a one-hour fire-rated interior wall assembly with 2x6 studs at 16 inches on center, mineral wool insulation, and gypsum wallboard on both sides. One-Sided Wood Structural Panel Box Header Typical Details - DT-AF-8 This detail shows a one-sided box header built using wood structural panels on the exterior face of the wall to eliminate conventional headers and increase cavity insulation space. Opening in Non-Load-Bearing Walls Typical Details - DT-AF-10 This detail shows framing for an opening in a non-load-bearing wall using a single opening top plate, cripple studs, and jack studs without conventional headers. Panels Attached Directly to Formed Steel Joist Typical Details - DT-WOM-2 This cross-section detail shows APA panel deck attachment to metal C or box section joist using hardened screwshank nails or self-tapping fasteners with optional adhesive. Panels Nailed to Nailable Steel Joists Typical Details - DT-WOM-3 This connection detail shows APA panel deck attachment to nailable steel joists using hardened screwshank nails and 2x4 nailer blocking at panel edges. Permitted Framing Alignment Offsets - Single Top Plates Typical Details - DT-AF-11 This detail shows permitted framing alignment for trusses, floor joists, rafters, and ceiling joists above (or below) studs when using a single top plate. Plywood Design Specification, Supplement 2-23: Design and Fabrication of Glued Plywood-Lumber Beams Technical Guides - S812 This publication presents the recommended method for the design and fabrication of glued plywood and lumber beams. Plywood Design Specification, Supplement 4-23: Design and Fabrication of Sandwich Panels Technical Guides - U814 This publication presents the recommended method for the design and fabrication of flat plywood sandwich panels. It is a supplement to the APA Plywood Design Specification. PRI Blocking Typical Details - DT-IJ-8 This detail shows PRI blocking installation. It outlines where blocking is required, how to attach blocking and floor joists to a double top plate, and vertical load capacities. PRI Rim Joist Typical Details - DT-IJ-9 This detail outlines the attachment of PRI (Performance Rated I-joist) rim to floor joists and a double top plate. It also includes bearing and vertical load transfer requirements. R20 Wall—Advanced Framing Techniques Typical Details - DT-CWA-2 R20 advanced framing wall assembly at 24" o.c. minimum with insulated corner, engineered wood or lumber header, R19 compressed fiberglass batts & wood structural panel sheathing. R21 Wall—Advanced Framing Techniques Typical Details - DT-CWA-5 This detail shows R21 advanced framing wall assembly with insulated header and corner, wood structural panel sheathing, and fiberglass batt insulation at 16" or 24" o.c. spacing. Rain-Screen Wall Details Typical Details - DT-BB-4 This detail shows rain-screen wall assembly of furring strips creating a drainage airspace over water-resistive barrier and wood structural panel sheathing. Rim Board Typical Details - DT-IJ-10 This detail shows the installation of APA rim board to floor joists and a double top plate, specifically noting vertical capacity and shear transfer nailing. Roof Ridge Detail—Pan and Cover Tile Typical Details - DT-BB-5 This detail shows pan and cover tile roof ridge detail of APA rated sheathing. Sheathing Reinforcement for Cantilevered I-Joist for Vertical Building Offset One Side Typical Details - DT-IJ-11 This detail shows installation of a sheathing reinforcement on cantilevered I-joists at a vertical building offset and specifies a reinforcement for one side of the I-joist. Sheathing Reinforcement for Cantilevered I-Joist for Vertical Building Offset Two Sides Typical Details - DT-IJ-12 This detail shows installation of a sheathing reinforcement on cantilevered I-joists at a vertical building offset and specifies reinforcement for two sides of the I-joist. Single-Layer Floor Systems with I-Joists or Trusses: Minimum 23/32" T&G APA Sturd-I-Floor Glued and Nailed to I-Joist, 0.026" Galvanized Steel Hat-shaped Furring Channels, Maximum 16" o.c., 3-Dimensional Detail Typical Details - DT-FR-16 This detail shows a single-layer 23/32" T&G APA Sturd-I-Floor assembly over wood I-joists with hat-shaped furring channels, mineral fiber batts, and Type C gypsum wallboard ceiling Single-Layer Floor Systems with I-Joists or Trusses: Minimum 23/32" T&G APA Sturd-I-Floor, 0.019" Galvanized Steel Resilient Channels Maximum 16" o.c., Two Layers 1/2" Type X Gypsum Wallboard Taped, 3-Dimensional Detail Typical Details - DT-FR-20 Single-layer tongue and groove APA-rated sheathing over wood I-joists with resilient channels and two layers of gypsum wallboard ceiling assembly for residential construction. Single-Layer Floor Systems with I-Joists or Trusses: Minimum 23/32" Tongue & Groove APA Sturd-I-Floor Glued and Nailed to I-Joist, 0.019" Galvanized Steel Resilient Channels Maximum 16" o.c., 3-Dimensional Detail Typical Details - DT-FR-15 Single-layer tongue and groove APA-rated sheathing over wood I-joists with resilient channels and two layers of gypsum wallboard ceiling assembly for residential construction. Single-Layer Floor Systems with I-Joists or Trusses: Minimum 23/32" Tongue & Groove APA Sturd-I-Floor, 0.019" Galvanized Steel Hat-Shaped Furring Channels Maximum 24" o.c., 3-Dimensional Detail Typical Details - DT-FR-18 Single-layer tongue and groove APA-rated sheathing floor system with wood I-joists, hat-shaped furring channels, gypsum wallboard ceiling, and mineral fiber insulation. Single-Layer Floor Systems with I-Joists or Trusses: Minimum 23/32" Tongue & Groove APA Sturd-I-Floor, 0.019" Galvanized Steel Resilient Channels Maximum 16" o.c., 1x4 Wood Setting Strips, 3-Dimensional Detail Typical Details - DT-FR-19 This detail shows a single-layer floor assembly using 23/32 T&G APA Sturd-I-floor over wood I-joists with resilient channels, insulation, and gypsum wallboard ceiling finish. Single-Layer Floor Systems with I-Joists or Trusses: Minimum 23/32" Tongue & Groove APA Sturd-I-Floor, Two Layers 1/2" Type X Gypsum Wallboard Taped, 3-Dimensional Detail Typical Details - DT-FR-21 This detail shows single-layer wood I-joist floor system with 23/32" T&G APA rated sheathing and two layers of 1/2" gypsum wallboard ceiling providing a fire-rated assembly. Single-Ply Header Typical Details - DT-AF-12 This detail shows an isometric view of a single-ply load-bearing header assembly at a wall opening with cavity insulation space and code-compliant king and jack stud configuration. Slab-On-Grade Foundation Typical Details - DT-BB-7 This detail shows slab-on-grade foundation detail of moisture control layers. Solid Block Typical Details - DT-IJ-14 This detail shows solid vertical blocking in a floor cavity, next to an I-joist, to properly transfer load from above to bearing below. Squash Block Typical Details - DT-IJ-15 This detail shows squash blocks at an I-joist with a 1/16" height difference for proper vertical load transfer around the joist. Strap Connection at Force Transfer Around Openings Shear Walls Typical Details - DT-FTO-2 This detail shows the blocking requirement for the metal strap at the exterior or interior of a force transfer around the opening shear wall. Stucco (Over Self-Furring Metal Lath), APA Rated Sheathing Exposure 1 Plywood or OSB Typical Details - DT-FR-22 This detail shows a fire-rated wall assembly of stucco over self-furring metal lath with APA rated sheathing, optional insulation, gypsum wallboard, and wood studs. Stucco Over APA Panel Sheathing Typical Details - DT-EWG-34 Stucco cladding assembly applied over APA Rated wood structural panel sheathing with two layers of weather-resistive barrier, self-furring metal lath, and metal bead. Sway Brace Blocking for Seismic Loads Parallel to the Joist Typical Details - DT-SPR-15 This detail shows two installation options for seismic sway brace blocking attached parallel to I-joist webs with blocking on one or both sides. Sway Brace Blocking for Seismic Loads Perpendicular to the Joist 1 Typical Details - DT-SPR-16 This detail illustrates a seismic sway brace blocking configuration, showing the installation of perpendicular diagonal bracing for I-joist floor systems. Sway Brace Blocking for Seismic Loads Perpendicular to the Joist 2 Typical Details - DT-SPR-17 This detail shows seismic bracing web blocking and cross member installation for I-joists to resist loads perpendicular to joist direction. Top-Mounted Hanger to 2x Plate Typical Details - DT-IJ-16 This detail shows I-joists with top mount hangers supported by a wide flange steel beam or wall with a 2x plate (or nailer) flush with the I-joists. Two-Hour Load-Bearing Interior or Exterior Wall System Typical Details - DT-FR-23 This detail shows two-hour fire-rated load-bearing interior or exterior wall assembly with 2x6 wood studs, mineral wool insulation, and Type X gypsum wallboard on both sides. Two-Sided Wood Structural Panel Box Header Typical Details - DT-AF-9 This detail shows a two-sided box header built using wood structural panels on both sides of the wall in lieu of conventional headers to increase cavity insulation space. Two-Stud Corner - Ladder Blocking Typical Details - DT-AF-13 This detail shows an isometric view of a two-stud corner framing assembly with 2x ladder blocking spaced vertically at 24 inches on center to provide interior drywall backing. Two-Stud Corner – Outside Corner View Typical Details - DT-AF-14 This detail shows a plan view of a two-stud corner framing assembly with 2x ladder blocking spaced vertically at 24 inches on center to provide interior drywall backing. Two-Stud Corner with Drywall Clips Typical Details - DT-AF-15 This detail shows a two-stud outside corner framing assembly using drywall clips to secure interior drywall without requiring a third corner stud. Typical Connections to Engineered Flat Roof Members Typical Details - DT-EWG-35 This detail shows four connection methods for flat roof systems: to wood I-joists, open-web parallel-chord wood trusses, steel bar joists with wood nailer and glulam beams. Typical Panel-To-Metal Framing Systems Typical Details - DT-EWG-36 This detail shows 4 methods for attaching APA panel deck to metal framing systems including nailable steel joists, nailer-anchored, and direct-to-formed steel joist configurations. UL Class 90 (NM519) Typical Details - DT-WWR-1 This detail shows a UL Class 90 rated roof assembly using two-ply asphalt glass fiber mat over plywood deck with Douglas-fir or Southern pine framing. UL Class 90 (NM520) Typical Details - DT-WWR-2 This detail shows a wind-resistive roof assembly with hot-mopped built-up roofing over APA-rated plywood sheathing and structural framing, rated U.L. Class 90. Wall Penetration with Flashing Typical Details - DT-BB-8 This detail shows two-piece flashing installation at wall penetration. Wall to Foundation Flashing at Brick Ledge Typical Details - DT-BB-9 This detail shows wall-to-foundation connection at brick veneer of base flashing. Wall to Foundation Flashing—Stucco Typical Details - DT-BB-10 This detail shows wall-to-foundation flashing detail at stucco-clad wall. Wall to Roof Flashing—Brick Veneer Typical Details - DT-BB-11 This detail shows wall-to-roof flashing detail at brick veneer roof intersection. Wall to Roof Flashing—Stucco Typical Details - DT-BB-12 This detail shows wall-to-roof flashing detail at stucco-clad wall. Water Table Slope Typical Details - DT-BB-13 This detail shows how the natural water table rises at the center of a building and how foundation perimeter drains lower the water table to drain to daylight on sloped sites. Wind Rated Roofs: UL Class 90 (NMS519) Typical Details - DT-WRR-1 This detail shows UL Class 90 rated roof assembly with two-ply asphalt glass fiber mat hot-mopped over plywood sheathing on wood framing with rayon tape. Wind Rated Roofs: UL Class 90 (NMS520) Typical Details - DT-WRR-2 This detail shows wood roof assembly with plywood decking over purlins/trusses with two-ply asphalt glass fiber mat roofing system, rated UL Class 90 Window Flashing with Building Paper Typical Details - DT-BB-14 This detail shows six-step sequential window installation when using building paper. Window Flashing with Water-Resistive Barrier Typical Details - DT-BB-15 This detail shows six-step sequential window installation detail of proper order of water-resistive barrier. Window Opening Detail—Brick Veneer Typical Details - DT-BB-16 This detail shows window head and sill detail at brick veneer. Window Opening Detail—Stucco Typical Details - DT-BB-17 This detail shows window head and sill flashing detail with stucco cladding. Wood Structural Panel Box Header Nail Pattern Typical Details - DT-AF-17 This detail shows the nail pattern for a wood structural panel box header at wall openings with continuous top and bottom plates. Wood Structural Panel Heavy Timber Roof Construction, 2-Dimensional Detail Typical Details - DT-FR-24 This detail shows a heavy timber roof assembly with wood structural panels, featuring heavy timber or glulam beams supporting tongue-and-groove wood decking with built-up roofing. Wood Structural Panel Overlap Typical Details - DT-AF-18 This detail shows proper wood structural panel sheathing overlap connections for two raised-heel truss configurations. Air Permeability of Wood Structural Panels as Air Barriers Technical Topic - TT-107 This publication answers questions regarding the performance of wood structural panels as air barriers Engineered Wood Floor Systems (Canada) Construction Guide - R300 Provides specification recommendations for plywood and OSB floor systems, the APA Glued Floor System and installation recommendations for panel subflooring and underlayment