How To Jack Up A Floor Joist

The screw jack is attached with nails to the underside of the girder and to the wood block atop a concrete pier.

How to jack up a floor joist.

Set a hydraulic jack and post under the beam and jack up the joists about 1 8 in. If the correction is minor only a 1 4 inch over an 8 foot span using shims between the floor joist and the subflooring can often rectify it without the need to raise the floor joist with a jack. This job took two people one afternoon. Wooden shims are often used to work out squeaks and stabilize spongy areas but they can also be used for slight adjustments to specific places.

Nailing two 2x4s together will work to span about three joists unless the sag is under a weight bearing wall. The inside pipe is threaded and adjusted up and down by turning a large wing nut. Jacking up a ceiling joist or beam is a process that requires the use of a screw jack. The only tools required is a bottle jack string straight claw hammer circular saw and a light source.

We used 18 000 pound screw jacks 4x4 lumber a circular saw power drill driver and cement blocks. Cost time and skills. Make repairs to settling piers and weak joists to fix swagging floors and roof lines. To correct this you can use a screw jack to lift the joist until the floor is again level.

A screw jack is a metal support post that can be adjusted to level the floor. It consists of two heavy steel pipes one inside the other. Jacking them up too fast may cause cracks in the walls and floors overhead. Tack a beam under the sagging joists.

We got muddy because we were in a dirt crawlspace doing just that crawling. A day until they re level. Jacking up a floor and leveling it is easy with these simple instructions. Total cost was less than 200 while a pro would charge 500 1000.