How To Flatten A Wood Sub Floor

As humidity or moisture from rain water falls onto the wood the lumber absorbs the liquid causing it to expand and bend.

How to flatten a wood sub floor.

I ve read that laminate flooring can only be installed over flat subfloors. Is there any way i can flatten it. These specs apply to wood or concrete subfloors boone says. Low areas that are less than 1 4 inch deep can often be filled with building paper.

High areas such as peaked joints in the subfloor or other ridges in the wood subfloor can be power sanded or planed. The national wood flooring association guidelines call for bringing that subfloor to within 3 16 inch of dead flat over any 10 foot span or alternatively within 1 8 inch over six feet says daniel boone nwfa director of technical training. It is the responsibility of the flooring installer to assess and address substrate flatness before installation. I have a plywood subfloor with a few high low spots.

When nailing down a wood floor the subfloor should be flat to within 1 4 in 10 or 3 16 in 6.