How to Fix a Cut Joist

Written by alexander callos
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How to Fix a Cut Joist
You will need construction adhesive to fix a cut joist. (Comstock Images/Comstock/Getty Images)

A joist is a horizontal beam that is part of the supporting structure of a house or building. Joists are typically found under floors near the ceiling of a basement. They are installed to help support the floor and are most often made of 2-by-8 lumber. Joists can become worn over time. It is even possible for them to be cut or split. It is possible to fix a cut joist without having to replace it entirely.

Skill level:

Things you need

  • Construction adhesive
  • Trowel
  • Drywall screws
  • Power drill
  • Steel plate

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  1. 1

    Locate the crack or cut in the joist and open up a tub of construction adhesive. Apply the construction adhesive over the crack in the joist and two feet on each side of the crack. Spread out an even layer 1/8-inch thick.

  2. 2

    Line up a joist the same size as the cut joist and press it firmly into place against the construction adhesive. This new joist will strengthen the old joist and reinforce it. Run your hands over the joist so it can adhere in place.

  3. 3

    Attach the two joists together with drywall screws. Insert a 2-inch drywall screw through the centre of the joist with a power drill. Space out the screws every 8 inches along the middle of the joists so the two joists can attach to each other properly.

  4. 4

    Attach a steel plate under the joists where the crack was located. Sit the joists in a plate at least 3 inches wide and screw the plate to the joists with the provided drywall screws. Insert a screw into each hole in the plate.

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