How to level the floor during old house renovation; don't skip this step before laying flooring.

When renovating an old house and laying new flooring, floor leveling is the most easily underestimated step. Clients often focus only on color and material when looking at samples, but what truly determines whether there will be hollow sounds, squeaking, or warping later is whether the subfloor is level, dry, and hard. After tearing up the old floor, I first use a long level or a laser to check…