Fill cracks or major voids with wood putty or a self leveling compound.
Floor with low spot wood.
Use a trowel to spread the material then allow it to dry before proceeding.
3 set a long straightedge tool or a straight piece of 2 by 4 inch lumber.
It s used to help insulate absorb sound and reduce wear on your floor.
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.
Mix the compound as directed on the package then pour it onto the low spots in the floor.
Use builder s felt or shingles stapled to the floor to fill small low spots if you.
If you are nailing the hardwood floor in place choose cementitious leveling compound that you can nail through.
Repair low spots in wood or concrete floors and clean them use an underlayment floor leveler or floor patch product to fix low spots in a wood or concrete subfloor.