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American Wood Council

What are I-joists and what are the building code and standards requirements for them?

Chapter 7 of the 2015 NDS says:

7.1.2 The term "prefabricated wood I-joist" refers to a structural member manufactured using sawn or structural composite lumber flanges and wood structural panel webs bonded together with exterior exposure adhesives, forming an "I" cross-sectional shape.

Design procedures and other information provided in the NDS apply only to prefabricated wood I-joists conforming to all pertinent provisions of ASTM D 5055.

The IBC gives code requirements for wood I-joists in Section 2303.1.2, and the IRC gives code requirements in Section R502.1.2.

For further information relating to code and standards requirements, see here: Download PDF

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