Jackup a House
My 34-year-old house has been relatively problem-free. But, major cracks are now beginning to show in the ceilings and walls, and my shower door won’t stay open any more. It’s time to re-level the house, and my sons have agreed to help. Is this something we can do ourselves, and is there a book available that we can refer to?
To make the repairs, you’ll need to rent a house jack. And, you will need a short length of 4×4 as a temporary support, plus two three foot-long pieces of 2×12 lumber, one for shoring up the jack base and one for shoring up the 4×4 to prevent it from sinking into the ground. You may also need several shims.
For high spots, use the jack to raise the floor at the suspected post. With floor pressure relieved (and with a temporary wood brace in place) remove the post (underpinning), trim it (not more than 1/4 at a time), and reinstall it. Use the same procedure for low spots, but instead of removing the post and cutting it, drive shims between the post and the beam. As each post is adjusted, the result will be visible from above, so make sure that someone remains in the house above to monitor what’s happening.