How To Flatten A Wood Sub Floor

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

How to flatten a wood sub floor. I have a plywood subfloor with a few high low spots. Using warped planks in framing a home or in a sub floor may result in problems as floors and walls begin to buckle. Installation of a wood floor over the subfloor insinuates acceptance by the flooring installer. It is the responsibility of the flooring installer to assess and address substrate flatness before installation.

Is there any way i can flatten it. These specs apply to wood or concrete subfloors boone says. I ve read that laminate flooring can only be installed over flat subfloors. As humidity or moisture from rain water falls onto the wood the lumber absorbs the liquid causing it to expand and bend.

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.