Technical Document Library

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

APA-Generic-Content-Card-Technical-Topic

Wood Structural Panel Shear Walls Installed with Inboard Rigid Foam Insulation 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.

A Portal Frame With Hold Downs for Engineered Applications Technical Topic - TT-100 This publication describes the use of portal-frame design in engineered applications and as bracing in conventional light-frame construction

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

APA Performance-Rated Wood Structural Panels as Thermal Barriers for Foam Plastics 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

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.

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.

Balcony Design for I-Joist Floor with Lumber Cantilever 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

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.

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.

Ceramic Tile Over Wood Structural Panel Floors 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

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.

Designing Diaphragms Over Existing Board Floors or Roofs 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.

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

Diaphragm Nail Penetration and 1-5/16-Inch Thick I-Joist Flanges 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.

Double-Sheathed Shear Walls 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.

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.

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

Effect of Overdriven Fasteners On Shear Capacity 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

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

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

Finishing Glued Laminated Timbers Technical Topic - TT-033 This publication discusses recommendations and exceptions for finishing glulam manufactured entirely from solid-sawn lumber.

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.

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.

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

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

Frequently Asked Questions About Portal Frames Technical Topic - TT-080 This publication answers FAQs about portal frame construction from the APA 2018 IRC wall bracing webinar series

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

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

Holes in Structural Glued Laminated Timber (Glulam) Rim Board in Light-Frame Wood Construction 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.

I-Joist Floor Details for 2-Inch-Thick Foundation Foam Insulation Technical Topic - TT-129 This publication presents four construction details for incorporating 2-inch-thick foundation foam insulation into residential I-joist floor assemblies.

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.

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.

Moisture Exposure Recommendations for Wood Structural Panels Technical Topic - TT-002 This publication provides recommended bond classification appropriate for end use in-service moisture conditions.

Moisture-Related Dimensional Stability Technical Topic - TT-028 This publication discusses linear expansion and thickness swell in wood structural panels due to moisture

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

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)

Nail Spacing Recommendations for APA EWS Rim Boards and I-joists Technical Topic - TT-094 This publication provides tables of the minimum recommended nail spacing for APA EWS Rim Boards and I-joists.

Nailed Box Beam Design Example Technical Topic - TT-116 This publication describes box beam design using engineering mechanics.

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

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

Preservative Treatment for Structural Glued Laminated Timber 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)

Recommendations for Snow and Ice on Wood Structural Panels Technical Topic - TT-119 This publication describes APA recommended guidelines for snow and ice accumulation on wood structural panels

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.

Requirements for Wall Coverings and Wind Pressures Technical Topic - TT-105 This publication discusses the International Residential Code (IRC) wall sheathing requirements regarding wind pressure

Residential Garage Door Installation Details with Prefabricated Wood I-Joists 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.

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.

Shear Wall Lumber Framing: Double 2X Framing vs. Single 3X Framing at Adjoining Panel Edges 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

Shear Wall Test Results Comparing 8d Common and 8d Box Nails Technical Topic - TT-087 This publication provides results from full-scale shear-wall tests and demonstrates the conservative capacities given in ESR-1539.

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

Slant Nailing Technical Topic - TT-058 This publication discusses the practice of driving nails at a slight angle in shear walls and diaphragms, and the difference between slant nailing and toe-nailing.

Small Cracks in the Flange at Ends of I-Joists Technical Topic - TT-026 This publication discusses the effect of small cracks radiating from corners of the flange groove on I-joist structural capabilities

Special Consideration for Designing Radiant Heat Systems Over Wood I-Joist Floors Technical Topic - TT-113 This publication addresses how to prevent adverse effects on wood I-joist floor framing from improperly designed, installed or operated underfloor heat systems

Staining of Concrete Poured Against Plyform Technical Topic - TT-059 This publication discusses the causes of concrete staining and provides some possible solutions

Suggested Blocking Details for Starter Joists of Engineered Wood Rim Board® Technical Topic - TT-078 This publication provides suggested I-joist blocking details, which may be used when local codes require prescriptive blocking in the space adjacent to starter joists or rim board.

True (shear-free) and Apparent Moduli of Elasticity Technical Topic - TT-082 Explains the relationships among bending deflection, shear deflection, total deflection, apparent modulus of elasticity and true modulus of elasticity in prismatic bending members

Wind Resistance of Wood Structural Panel Sheathed Walls Technical Topic - TT-110 This publication discusses wind resistance of light-framed walls sheathed with plywood or OSB using the methodology of the 2012 IBC Table 2304.6.1 and the 2012 IRC Table R602.3(3)

Wood I-Joists and APA Performance Rated Rim Boards Technical Topic - TT-022 This publication discusses the structural superiority of using APA Performance Rated Rim Boards with prefabricated wood I-joists rather than sawn lumber rim boards.

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

Wood Structural Panel Identification Technical Topic - TT-013 This publication answers commonly asked questions about identification marks found on wood structural panels

Wood Structural Panel Shear Wall Deflection Formula Technical Topic - TT-053 This publication discusses components of shear-wall deflection and includes formulas for calculating deflection of shear walls

Wood Structural Panel Sheathing on Hip Roofs Technical Topic - TT-083 This publication provides installation guidelines for hip-roof panel applications on trusses spaced 24 in. o.c. that address serviceability issues and improve performance

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.

Wood Structural Panels for California Division of State Architect Projects Technical Topic - TT-106 This publication discusses California regulations interchangeable that treat plywood and oriented strand board (OSB) as interchangeable

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

Technical Document Library

Find Documents By

Results for TT-015

Most Relevant