I live in a 1940's house that has sunk and settled a lot over the years. The joists span 12 feet from sill to sill with no support in the middle. In one place there is a bathroom, pantry, and staircase that sits on these joists. The floors have sank about 1 1/2 over the 80 years it's been there. There is a lot of duct work, plumbing, ect... So running a 4*6 in this spot is near impossible. My question is what kind of piers/ pillars could I add under each joist to stop it from sinking more?
Thanks in advance