How To Fix A Broke Floor Joist

It s best to identify problem joists and fix them before installing your underlayment and new floor covering.

How to fix a broke floor joist.

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. I recently had to repair a broken floor joist that had cracked. In this video this old house general contractor tom silva helps a homeowner repair a cracked floor joist.

One way to fix joist problems is to fasten a few new joists next to a damaged floor joist in a process called sistering. Slip an old work metal joist hanger onto the end of the joist. Photo by summer galyan. 2 jack up each side of the joist 1 8 inch at a time until the joist is level.

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

Squeeze a generous amount of carpenter s glue into the crack in the floor joist. When installing a new joist you may need to notch the bottom edge so it can fit over the foundation or beam.