Understanding Joist Span and Cantilevers

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Learn joist span and reading a span chart 💪 #deck #joistspan #spanchart #learn #carpentry

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What happens here

The video introduces the concept of deck joist span. Joists are structural members that extend over two bearing points. The "joist span" refers to the distance between these bearing points. The video also explains cantilevers, which are portions of the joist extending beyond a bearing point. It specifies that a cantilever should be no more than one-quarter (1/4) of the joist's back span (the portion supported by two bearing points) for structural integrity. The demonstrator uses a small wooden model of a deck frame and a metal rod to point out these elements.

Goal: Identify joist span and the maximum allowable cantilever length.

Tools and materials

Joists — Forming the main horizontal structure of the deck, Ledger board (represented by wooden piece) Unknown

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Floor span explained. When joists are installed over two bearing points, we have to be sure that this joist can handle the span. The span is from both ends of bearing points. Both of these sections would be considered cantilever. In this case, the cantilever can only be 1/4 the length of the back span. When determining your span, you have to consider your joist spacing. Let's say these are 24 on center. That means these joists are going to have to be bigger

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