When you choose Trus Joist, you're choosing the brand that:

-Invented the very first I-Joist over 50 years ago

-Lead innovation and design to create a suite of Engineered Wood Products, including I-Joist, LVL Microllam, LSL Timberstrand, and PSL Parallam

-Pushed the limits of span charts to make the open floor concepts of today a reality 

-Has been the #1 used I-Joist for the past 14 years 

-And is one of the most trusted brands in the building community today.

Trus Joist.  The Only Choice. 



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Available Sizes 


Span Chart

L/480 is the design criteria we recommend for the best performing floor

Features and Benefits:

-Long Spans

        I-Joists can span up to a whopping 32' without support, giving custom home builders the ability to create open floor plans that customers demand

-LVL Flange

        An LVL flange is critical for a high performing floor because it prevents squeaky floors in two ways.  1) the LVL flange holds fasteners better, preventing loose nails that cause squeaks, and 2) it will not shrink over time with the moisture change which is another common cause of squeaks 

-Engineered for Consistency 

        All TJI Joists will be perfectly straight and will not twist, warp, or cup

-Allow for spacing for HVAC, Electrical, and Plumbing

        Large holes can be cut in the webbing of TJI Joists, allowing for mechanicals to be easily run and installed.  Joists can also be spaced wider than traditional solid sawn joists which allows for quicker and easier installation

-Fast and Easy Install

        All TJI Joists are designed using patented software that designs a floor taylor-made for every home.  This software creates a layout and specifies where every single framing member goes.  When the material arrives on the jobsite, there is minimal cutting, and carpenters know exactly where every joist goes. 


Trus Joist I-Joist Product Page

Trus Joist I-Joist Installation Guide

Allowable Holes I-Joists & Beams

Trus Joist I-Joist Spec Sheet

Trus Joist I-Joist Warranty


Information Request


 Floor Plan Takeoff Process

Sample Floor Plan Layout

Minimum Criteria Span (per code)



Fiber Source


Installation Videos