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.