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TJI® Joists

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 jobsite wood waste. It all starts with Trus Joist TJI joists.

Flak Jacket® Fire Protection

Meets IRC requirements without the addition of gypsum or other steps


Eastern Canada

Information on Trus Joist® TJI® s31, s33 and s47 joists for use in Eastern Canada



Weyerhaeuser offers an array of software packages to help you specify individual framing members, create cut lists, manage inventories — even help you design a complete structural frame.
Learn more

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.
Read more about TJ-Pro

Product Literature

Design & Specification

Specifier’s Guide for TJI 110, 210, 230, 360, and 560 Joists
United States: TJ-4000 | W. Canada: TJ-4500

Fire-Rated Assemblies and Sprinkler Systems
N. America: 1500

Technical Resource Sheets

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

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

Installation Guides

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

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

Product Overviews

TJI Joists
N. America: TJ-4006

Floor Performance and TJ-Pro Ratings
N. America: SVC-4005


Trus Joist TJI Joist Warranty
N. America: TJ-1006, French:TJ-1006F

Trus Joist No Red Tag Guarantee
N. America: TJ-1013

Other Documentation

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