Weyerhaeuser Lumber TJI® Joists

Trus Joist developed the wooden I-joist 50 years ago and Weyerhaeuser continues to build on that legacy. Engineered to provide strength and consistency, these joists are a key part of making a high-performance floor. The dimensional stability of Trus Joist TJI joists help them resist the warping, twisting, and shrinking that can lead to squeaky floors. TJI joists are light weight and come in long lengths, which makes them faster and easier to install than traditional framing and saves you both time and money.

Chosen for 14 Straight Years

For 14 years straight years, TJI joists have been recognized by readers of Builder Magazine as the “most-often-used engineered I-joist.” The results are from a survey of 10,800 builders, builder-developers and general contractors in the U.S. With TJI joists, you get more than just a great product, you also get decades of research and real-world experience. All this results in better performing floors that use fewer trees while also reducing job site wood waste. It all starts with Trus Joist TJI joists.

TJ-Pro™ Rating System

When you build with TJI joists, you not only get the best product, you also get unsurpassed customer service, design expertise, and engineering support. Why not take advantage of our industry-leading software that uses the TJ-Pro™ Rating System? TJ-Pro helps you design and build a floor system with Trus Joist components that work together to meet or exceed customer expectations. [LEARN MORE]


Design & Specification

Specifier’s Guide for TJI 110, 210, 230, 360, and 560 Joists United States: TJ-4000

Specifier’s Guide for Deep Depth 18"–24" TJI 360, 560 and 560D Joists United States: TJ-4005

Fire-Rated Assemblies and Sprinkler Systems North America: 1500


Technical Resource Sheets

Sound Performance of Trus Joist TJI Joist Fire-Rated Floor Assemblies North America: TJ-4035

Preservative Treatments Approved for Trus Joist Engineered Wood Products North America: TJ-1020


Installation Guides

Installation Guide for Floor and Roof Framing with TJI 110, 210, 230, 360 and 560 Joists North America: TJ-9001

Installation Guide for Deep Depth 18"–24" TJI 360, 560 and 560D Joists North America: TJ-9006


Product Overviews

TJI Joists North America: TJ-4006

Floor Performance and TJ-Pro Ratings North America: SVC-4005



Trus Joist TJI Joist Warranty North America: TJ-1006

Trus Joist No Red Tag Guarantee North America: TJ-1013