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joist cap

Joist cap adds a layer of protection to deck joists by covering them to prevent water infiltration that will cause premature cracking and rot of the joists.

14. Installing Joist Cap

Many home owners are under the false impression that products such as composite decking boards can extend the life of their deck indefinitely. One reason this is inaccurate is that, while the deck boards may not deteriorate due to weathering, unless they choose an alternative material, the wooden frame beneath will.

By using pressure treated lumber, most decks will last for two decades, or more, with proper treatment, but over time the lumber will still suffer rot. One way to slow this process is through the installation of joist cap.

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