How To Jack Up A Floor

Underneath the floor in a crawl space or basement position the floor jack or jacks and place the beam in position.

How to jack up a floor.

Continue to raise the jack until you feel some resistance. Carefully hoist the jack until the beam reaches the floor underneath. By jacking up the ceiling of the basement you. On the top side of the floor another fix it idea to lay down new hardwood over the existing floor.

Raise each jack by 1 8 inch at a time this will help to reduce any damage to window frames and plaster or drywall walls above the floor. A common scenario is to install temporary jack posts and support beams then permanent posts and beams over new footings. Make sure that the lumber or lally posts are perpendicular when jacking or they may slip out of position. After they were in place we hoisted up the 4 x6 x8 beam so that it crossed all four of the new joists sliding the screw jacks underneath.

Place support of the floor joists with wood studs. Use a hammer a nail puller and a sledgehammer to remove the existing underpinning wood post and nails. Shows raisinge a sagging floor gradually with bottle jacks. Block under each one until there is just enough room to fit the girder between the jacks and the joists.

Slowly jack up the floor. Use a string to watch the floor come up. When this happens stop hoisting the jack and lock it in place. Center the screw jack below the girder and on top of the wood block on the concrete pier.

Use a hydraulic jack and a short post to shore up the floor during this process. You will have to make sure your joists can handle the addition of considerably more weight from the plywood subfloor and any floor coverings. Place a jack on the inside edge of each outside footing. Once the new joists were up we found locations where the concrete blocks could sit flat on the ground so the pressure wouldn t cause them to crack.

The 4 inch lally posts can be replaced by 6 x 6 inch lumber.