In another post i asked about how to fix a very uneven floor in a very old house.
How to level an uneven floor in an old house.
When complete this will be a spacer that bridges the gap between the old floor and the new level surface.
Even historic houses have saggy sloping floors.
Then you can level the floor and.
Some homeowners when confronted with staggering bills for floor repairs come to terms with their floors.
Position the leveling strip on the floor and see if the top edge of the strip checks out as level.
Having an older house can add a lot of character especially if you are into that style and design.
If the uneven floor is due to floor joists that have warped or twisted over time or were incorrectly installed the only way to level the floor is to remove the subflooring and shim the joists.
If you have uneven floors in old house issues you can rectify this.
Adjust the strip as needed.
Old houses often have floors that are less than perfect.
I received the following answer from jay which is greatly appreciated.