On the top side of the floor another fix it idea to lay down new hardwood over the existing floor.
How to level out a slanted floor.
Then measure the distance between the bottom of the level and the level area of flooring.
If the floor is uneven lift up the board until it is level so you ll know how much flooring compound you ll need to even it out.
There are several problems that can cause a sagging or sloping floor which is one of the reasons why fixing a sloping floor is difficult.
This determines the length of the new post.
Foundation issues deteriorating wood supports especially sills which rest on the foundation footer improperly installed joists or sub floors and other issues can all cause a floor to slope or sag.
The new post should equal the length of the old post less the measurement taken with the level.
Place one end of a level on the high spot and the opposite end to a predetermined level area on the floor.
A plywood subfloor will bridge any minor waves in the existing floor and leveling compound would help too.
If the area is very large use a long straight 2 in 4 in 5 1 cm 10 2 cm board and set your level on top of it.
This video is about how to make a concrete subfloor leveling with screed leveling tripods https bit ly 2uvcpfx using self leveling concrete when your roo.
You will have to make sure your joists can handle the addition of considerably more weight from the plywood subfloor and any floor coverings.
For example if you are trying to level a chair on a sloped floor slip a book of matches or a wooden shim under the leg that isn t reaching the ground.
Floors are rarely perfectly level.
Place a thin angled item under the short leg or side of the furniture.