DIY Network

How to Fix a Sagging Floor

These step-by-step instructions demonstrate how to level a sagging floor by installing support beams.

More in Remodeling

  • Time


  • Price Range

    $500 - $1,000

  • Difficulty



Step 1: Install Floor Support Beams

Determine how many beams will be needed to support the sagging area. Then measure between the joists in the area to be supported. Cut the 4x4s to that length.

Place the jacks in position and jack up the floor. Check to see if it's level.

Push the 4x4s between the joists, and nail them into place. Attach the hangers, and nail them in place. These hangers will act as supports for the beams.

Once the new support beams are installed, carefully remove the jack. Test the floor with a level.