Step-by-Step Instructions and Pictures: How to Make Structural Repairs By Sistering Floor Joists

By Brett Martin
Repair sagging or broken floor joists by "sistering" on a new joist. Read an overview for how to make structural repairs.
From The Family Handyman
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Make Structural Repairs
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If a crack or sag is isolated to one area, the sister joist should extend at least 3 ft. on both sides of the problem area. But it’s usually best to run the sister joist over the entire span. When the sagging joists are level, apply a generous bead of construction adhesive to the existing joist.
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