And with their light weight and long lengths, TJI joists are faster and easier to install than traditional framing, which can save time and money. But even with the familiarity and ease of use, there are a few common mistakes during installation that can lead to red flags and tear-outs, or to squeaky floors for homeowners down the road. Many errors can be avoided simply by better communication across the project team, by planning ahead and by paying careful attention to plans and drawings. Lack of Communication Many of the mistakes listed here come back to one simple problem: ambiguity between the dealer, architect, builder and framing contractor.

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You did not provide a valid email address. I-Joists I-Joist Basics I-joists are strong, lightweight, "I" shaped engineered wood structural members that meet demanding performance standards.

I-joists are comprised of top and bottom flanges, which resist bending, united with webs, which provide outstanding shear resistance. The flange material is typically laminated veneer lumber LVL or solid sawn lumber, and the web is made with plywood or OSB. The robust combination of structural characteristics results in a versatile, economical framing member that is easy to install in residential and light commercial projects.

Common I-Joist Applications I-joists are used extensively in residential floor and roof framing. They are ideal for long spans, including continuous spans over intermediate supports. In addition, wood I-joists are typically stocked and readily available in depths that meet the needs of residential framing.

Common Uses I-joists are popular for floor and roof framing. Many APA member-manufacturers have software design tools; contact the manufacturer at left for more information. This Performance Standard provides an easy-to-use table of allowable spans for applications in residential floor construction, allowing designers and builders to select and use I-joists from various member manufacturers using just one set of span tables.

The mark signifies that product quality is subject to verification through APA audit—a procedure designed to assure manufacture in conformance with APA performance standards or the standard shown in the mark. I-Joist Publications.


Common Repairs



Engineered Wood, GLB & I-Joists



I-Joists & Rim Boards


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