How To Fix A Broke Floor Joist

This is referred to as sistering the plan was to sister a new joist next to the old one.

How to fix a broke floor joist.

I recently had to repair a broken floor joist that had cracked. Correcting a problem joist is an easy repair and is usually accomplished by fastening a new joist next to a damaged floor joist doubling the thickness of the framing member. One way to fix joist problems is to fasten a few new joists next to a damaged floor joist in a process called sistering. 2 jack up each side of the joist 1 8 inch at a time until the joist is level.

Place one adjustable jack post about two feet past each side of the crack. A contractor can fix a broken floor joist by placing another joist next to it and attaching with structural screws and glue. Photo by summer galyan. I suppose somewhere in the world there are floor joists that need to be repaired that have wide open clear joist bays with no pipes wires or obstructions.

Position a 2x4 post and hydraulic jack directly beneath the cracked end of the joist. In this video this old house general contractor tom silva helps a homeowner repair a cracked floor joist. When installing a new joist you may need to notch the bottom edge so it can fit over the foundation or beam. If you re concerned about the structural integrity of sagging cracked or twisted joists in your house first call in a structural engineer to inspect the floor and pay to get a recommendation for reinforcement and strengthening measures.

Squeeze a generous amount of carpenter s glue into the crack in the floor joist. It s best to identify problem joists and fix them before installing your underlayment and new floor covering.