How To Fix Cracked Floor Joist

Nailing two 2x4s together will work to span about three joists unless the sag is under a weight bearing wall.

How to fix cracked floor joist.

Identify the cracked or sagging joist before it causes additional problems. I recently had to repair a broken floor joist that had cracked. Position a 2x4 post and hydraulic jack directly beneath the cracked end of the joist. Tack a beam under the sagging joists.

Remove any blocking or bridging above the sill or beam where the sister joist will go. Set a hydraulic jack and post under the beam and jack up the joists about 1 8 in. Jacking them up too fast may cause cracks in the walls and floors overhead. Squeeze a generous amount of carpenter s glue into the crack in the floor joist.

A day until they re 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. Slip an old work metal joist hanger onto the end of the joist.

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. Fixing broken cracked sagging floor joists.