Repair Rotting Deck Joists

Q: How do I repair a deck joist that is starting to rot?

 

A: The easiest way is to repair a joist is to install a sister joist to strengthen the damaged area. Use a hammer and chisel to chip away the damaged wood. Liberally apply two coats of waterproof sealer over the damaged joist. Cut a reinforcing sister joist from lumber that is the same dimension as the damaged joist. Treat all sides of the new joist with the sealer, and face-nail it flush over the old joist with 10d nails or screws every 2 feet. Toe-nail the ends of the sister joist to the ledger and rim joist.

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No matter what material is used for the surface of a deck, the substructure is likely to be built with wood. Over time, water leaking through deck boards can cause hidden damage unless the wooden joinery of the foundation is properly protected. In fact, builders have reported that wood left exposed to the elements can […]

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