Older houses that have over time settle into various problems. You can use regular shimstock that you can get at anyplace that sells wood.
One house I had to put six floor jacks in the basement to hold up the floor, because I wanted to take the 6" drop out of the middle. 1/2" a day untillI was a little over a 1/2 inch to tall. Under that room I used three engineered joists, bolted every 6" in a v pattern. I dropped the jacks and the she was.
alevel floor. I used to buy, fix, sell old houses. None of them that I ever went in had more than 1 or 2 walls that were square.
I usually tell people that its the character of the house and should be enjoyed that way. To some extent, I like that.
