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.
Floor levelling shims.
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There are probably as many ways to level a floor as there are out of level floors being leveled by someone so here s matt jackson s take on making precise extra long shims.
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Find a straight board.
Naturally decay and pest resistant.
Figure out how much taper you ll need.
Contractor cedar shim eastern white cedar shims are virtually a eastern white cedar shims are virtually a maintenance free wood.
This may require either sanding high spots or shimming with shingles in the low spots to build them up.
Clean the floor area to be filled with a broom or vacuum and dampen it with a wet sponge to avoid rapid drying.
You do want them fairly close together so yes 12 to 16 inches apart.
These thick shims are scored to make size adjustments easy break off the excess shim for a custom fit around fasteners or corners.
Use them to align cabinets doors and windows or for other rough leveling.
They are easy to work with and have always been the first choice for all your home renovation projects.
A plywood subfloor will bridge any minor waves in the existing floor and leveling compound would help too.
Step by step process for cutting a six foot ling shim from a 2x4.
What he is describing is to lay shims over your existing floor.
To shim the floor take a straightedge or a level and look for imperfections in the flatness of the floor and determine if it needs to be raised or lowered.
You would set shims such that when you level across those shims the tops of all the shims are level.
Self leveling compound is a cement based mixture that is applied in a near liquid state.