Slowly jack up the floor.
How to jack up a floor.
A taut string stretched across the floor will show the amount of deflection and improvement.
Continue to raise the jack until you feel some resistance.
On the top side of the floor another fix it idea to lay down new hardwood over the existing floor.
Shows raisinge a sagging floor gradually with bottle jacks.
Make sure that the lumber or lally posts are perpendicular when jacking or they may slip out of position.
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.
Center the screw jack below the girder and on top of the wood block on the concrete pier.
Underneath the floor in a crawl space or basement position the floor jack or jacks and place the beam in position.
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 support of the floor joists with wood studs.
The solution to sagging floors or the damaged sills and joist ends that contribute to them often involves jacking.
Carefully hoist the jack until the beam reaches the floor underneath.
The 4 inch lally posts can be replaced by 6 x 6 inch lumber.
Block under each one until there is just enough room to fit the girder between the jacks and the joists.
A common scenario is to install temporary jack posts and support beams then permanent posts and beams over new footings.
When this happens stop hoisting the jack and lock it in place.
Use a string to watch the floor come up.
By jacking up the ceiling of the basement you.
Use a hammer a nail puller and a sledgehammer to remove the existing underpinning wood post and nails.
Place a jack on the inside edge of each outside footing.
Use a hydraulic jack and a short post to shore up the floor during this process.