A taut string stretched across the floor will show the amount of deflection and improvement.
How to jack up a floor.
Place a jack on the inside edge of each outside footing.
Place support of the floor joists with wood studs.
The 4 inch lally posts can be replaced by 6 x 6 inch lumber.
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.
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.
Shows raisinge a sagging floor gradually with bottle jacks.
Use a string to watch the floor come up.
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.
Continue to raise the jack until you feel some resistance.
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.
Underneath the floor in a crawl space or basement position the floor jack or jacks and place the beam in position.
Carefully hoist the jack until the beam reaches the floor underneath.
Center the screw jack below the girder and on top of the wood block on the concrete pier.
Block under each one until there is just enough room to fit the girder between the jacks and the joists.
When this happens stop hoisting the jack and lock it in place.
A plywood subfloor will bridge any minor waves in the existing floor and leveling compound would help too.
The solution to sagging floors or the damaged sills and joist ends that contribute to them often involves jacking.
A common scenario is to install temporary jack posts and support beams then permanent posts and beams over new footings.
Slowly jack up the floor.