Technical Document Library
Research-Backed Guidance for Every Project
Research-Backed Guidance for Every Project
Technical Topic - TT-104
This publication explains the difference between apparent modulus of elasticity (MOE) and shear-free MOE in glulam beams
Technical Topic - TT-134
Inboard rigid foam reduces WSP shear wall strength. TT-134 gives tested nail size/spacing requirements to restore code-equivalent seismic capacity.
Technical Topic - TT-100
This publication describes the use of portal-frame design in engineered applications and as bracing in conventional light-frame construction
Technical Topic - TT-107
This publication answers questions regarding the performance of wood structural panels as air barriers
Technical Topic - TT-060
Provides a recommendation for foam plastic roof insulation over minimum Performance Category 15/32 engineered wood panels that meet the 15-minute thermal barrier requirement
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 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.
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 Topic - TT-025
This publication discusses fire test results comparing the burn-through resistance of oriented strand board (OSB) and plywood.
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.
Technical Topic - TT-006
This publication describes Tile Council of North America (TCNA) specifications for wood structural panel floor systems under ceramic tile, tested in accordance with ASTM C627
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.
Technical Topic - TT-097
This publication explains the design considerations for installing a wood structural panel diaphragm over existing board sheathing (decking) in floors or roofs.
Technical Topic - TT-014
This publication describes various wood structural panel manufacturing processes that result in the eradication of insects
Technical Topic - TT-061
This APA technical publication provides an NDS-backed engineering analysis regarding diaphragm nail penetration and capacity in 1-5/16-inch wood I-joist flanges.
Technical Topic - TT-115
This technical topic presents the results and discussion of full-scale testing of double-sheathed shear walls with both layers of wood structural panels on a single side.
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.
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
Technical Topic - TT-012
This publication provides suggested guidelines for determining if overdriven fasteners will affect the shear capacity of diaphragm or shear wall construction
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
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 Topic - TT-033
This publication discusses recommendations and exceptions for finishing glulam manufactured entirely from solid-sawn 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.
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.
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
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 Topic - TT-080
This publication answers FAQs about portal frame construction from the APA 2018 IRC wall bracing webinar series
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
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
Technical Topic - TT-135
Provides recommendations for hole size and segment length for glulam rim board for situations where holes are not specified in the construction documents or shop drawings.
Technical Topic - TT-129
This publication presents four construction details for incorporating 2-inch-thick foundation foam insulation into residential I-joist floor assemblies.
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 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.
Technical Topic - TT-002
This publication provides recommended bond classification appropriate for end use in-service moisture conditions.
Technical Topic - TT-028
This publication discusses linear expansion and thickness swell in wood structural panels due to moisture
Technical Topic - TT-098
This publication discusses the benefits of mulching construction-related wood scraps, including glued engineered wood products
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)
Technical Topic - TT-094
This publication provides tables of the minimum recommended nail spacing for APA EWS Rim Boards and I-joists.
Technical Topic - TT-116
This publication describes box beam design using engineering mechanics.
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
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
Technical Topic - TT-092
This publication describes revisions of the 2016 American Wood Protection Association (AWPA) U1 standard that are related to structural glued laminated timber (glulam)
Technical Topic - TT-119
This publication describes APA recommended guidelines for snow and ice accumulation on wood structural panels
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.
Technical Topic - TT-105
This publication discusses the International Residential Code (IRC) wall sheathing requirements regarding wind pressure
Technical Topic - TT-130
This publication provides a method for garage door installation with back-hangs that are attached to the bottom flange of residential I-joists with lag screws.
Technical Topic - TT-052
This publication provides information about the performance, proper specification and application of oriented strand board (OSB) products.
Technical Topic - TT-076
This publication provides an evaluation of double 2x framing members as substitutes when single 3x framing members at adjoining panel edges are specified by code for shear walls