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Technical Topics: 1-5/16 Inch-Thick I-Joist Flanges and Diaphragm Nail Penetration
TT-061
Technical Topics: 1-5/16 Inch-Thick I-Joist Flanges and Diaphragm Nail Penetration

Discusses minimum nail penetration required to develop full connection capacity. Revised September 30, 2017.

Technical Topics: A Portal Frame With Hold Downs for Wall Bracing or Engineered Applications
TT-100
Technical Topics: A Portal Frame With Hold Downs for Wall Bracing or Engineered Applications

Describes the use of portal-frame design in engineered applications, as well as its use as bracing in conventional light-frame construction. Revised May 2020.

Technical Topics: Air Permeability of Wood Structural Panels as Air Barriers
TT-107
Technical Topics: Air Permeability of Wood Structural Panels as Air Barriers

Answers questions regarding the performance of wood structural panels in air barrier systems. Issued October 2016, 3 pages.

Technical Topics: Allowable Bearing Stress For APA Wood Structural Panels
TT-001
Technical Topics: Allowable Bearing Stress For APA Wood Structural Panels

Results of bearing tests conducted on plywood and OSB specimens of different thicknesses sampled from various mills by APA. Revised May 2020.

Technical Topics: Allowable Depth-To-Width Ratios for Glulam Beams
TT-085
Technical Topics: Allowable Depth-To-Width Ratios for Glulam Beams

Provides guidance on lateral bracing recommendations for wood bending members having varying depth-to-width ratios and a brief history of testing. Revised May 2020.

Technical Topics: APA Engineered Wood I-Joist Floors and Radiant Heat Systems
TT-113
Technical Topics: APA Engineered Wood I-Joist Floors and Radiant Heat Systems

If radiant (hydronic) underfloor heat systems are improperly designed, installed, or operated, they can have adverse impacts upon wood I-joist floor framing. This Tech Topic addresses prevention of such problems. Revised September 2014.

Technical Topics: APA Performance-Rated Wood Structural Panels as Thermal Barriers for Foam Plastics
TT-060
Technical Topics: APA Performance-Rated Wood Structural Panels as Thermal Barriers for Foam Plastics

Discussion and recommendation for foam plastic roof insulation over minimum Performance Category 15/32 engineered wood panels that meet the 15-minute thermal barrier requirement. Revised August 1, 2012.

Technical Topics: APA Plywood for Aluminum Hydraulic Trench Shoring
TT-062
Technical Topics: APA Plywood for Aluminum Hydraulic Trench Shoring

APA-trademarked panel recommendations for trench-shoring design. Revised March 11, 2016, 4 pages.

Technical Topics: APA Rated Siding Applied to Post Frame Structures
TT-023
Technical Topics: APA Rated Siding Applied to Post Frame Structures

Minimum application recommendations for design and specification of columns, girts, blocking and framing connections of panel siding on post frame structures. Issued January 6, 2013.

Technical Topics: APA Structural-Use Panels Over Concrete Slabs
TT-007
Technical Topics: APA Structural-Use Panels Over Concrete Slabs

Recommends three methods for the installation of a wood floor system over a concrete slab: sleepers, rigid foam or direct. Revised February 10, 2017.

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