Sister Cracked Floor Joist

I recently had to repair a broken floor joist that had cracked.

Sister cracked floor joist. Place it next to the damaged joist with the crown side up. But it s usually best to run the sister joist over the entire span. Squeeze a generous amount of carpenter s glue into the crack in the floor joist. 2 x 4s together to make a cross beam then place the beam perpendicular to the joists near one end of the joists.

A severely cracked or sagging floor joist can get worse over time causing the floor above it to slope or become unleveled. If a crack or sag is isolated to one area the sister joist should extend at least 3 ft. 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. Slip an old work metal joist hanger onto the end of the joist.

Tools materials required. When the sagging joists are level apply a generous bead of construction adhesive to the existing joist. On both sides of the problem area. Position a 2x4 post and hydraulic jack directly beneath the cracked end of the joist.

Properly sistering floor joists is very important and should not be rushed to save time. Since this is a repair of a faulty or damaged floor joist it is imperative to do this project correctly and there are a few big mistakes to avoid. If needed notch the bottom edge of the sister joint so it fits over the foundation or beam. Fixing broken cracked sagging floor joists.

Structural screws and joist hangers if applicable.