You will have to make sure your joists can handle the addition of considerably more weight from the plywood subfloor and any floor coverings.
How to level a wood floor for hardwood.
This will expose the subfloor underneath which is where most leveling problems lie.
Clean it well with a wet dry vacuum.
When installing laminate vinyl tile or hardwood flooring it s important to know how to level a floor.
A subfloor is meant to be flat and level.
Use screws that penetrate at least one and one quarter inch into the wood joist.
A level subfloor will help your flooring last longer and keep the finish attractive.
A plywood subfloor will bridge any minor waves in the existing floor and leveling compound would help too.
Otherwise lay a very straight metal bar or wood board on the floor and place a level on top.
On the top side of the floor another fix it idea to lay down new hardwood over the existing floor.
Use a pry bar to pull up hardwood floors one section at a time or unfasten carpet or laminate and roll it up from one end.
A floating floor laminate or locking hardwood shouldn t be installed over a wood subfloor that s adhered to a concrete slab.
If you have very high or low spots foundation or structural problems or termite damage.
3 set a long straightedge tool or a straight piece of 2 by 4 inch lumber.
Self leveling underlayment products can be used on concrete floors wood subfloors that are uneven but still in decent shape and even over ceramic tile floors eliminating the task of tearing.
If the level is in the bubble you re ready to go.
If not your floor covering which is the solid hardwood laminate tile or other exposed flooring that goes on top of the subfloor will never be flat and level this problem can be fixed but it all depends on exactly what kind of uneven subfloor you have.
Remove any obstacles from the floor.
Pound nails into the subfloor with a hammer and set screws slightly below the surface of the subfloor with a screwdriver.
Use deck screws or ring shank nails set into the floor joists to secure loose or squeaking pieces of wood subfloor material.
To do this you ll want the longest level you can find.
After the subflooring is screwed tightly to the joists vacuum the floor to remove all dust and debris.
Use a six foot long straight edge and a level to find the highest spot on the floor.
Leveling floors can be a diy project or left to professionals.