How to Jack Up a Ceiling Joist

Written by cameron easey
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How to Jack Up a Ceiling Joist
Jacking up ceiling joists will correct sagging floors. (Jupiterimages/ Images)

Jacking up a ceiling joist or beam is a process that requires the use of a screw jack. When a floor in your home begins to sag, it indicates it is receiving insufficient support due to a structural deficiency. To correct this, you can use a screw jack to lift the joist until the floor is again level. This will require first setting the screw jack in the correct position under the ceiling joist.

Skill level:

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Things you need

  • Screw jack
  • Adjustable wrench
  • Level

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  1. 1

    Place the screw jack under the centre of the ceiling joist or floor joist.

  2. 2

    Turn the adjustment screw counterclockwise to lower it all the way down with the adjustable wrench.

  3. 3

    Raise the telescoping arm as high as it will go. Align the pinholes, then insert the locking pin.

  4. 4

    Turn the adjustment screw to the right with the adjustable wrench. Raise the top of the screw jack until it touches the bottom of the ceiling joist.

  5. 5

    Place a level on the floor above the location of the screw jack.

  6. 6

    Turn the adjustment screw one full turn to begin raising the ceiling joist. Continue this step to raise the ceiling joist.

  7. 7

    View the bubble on the level to see how close you are to levelling the floor.

Tips and warnings

  • Place the screw jack on a solid, flat surface.

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