Uneven floor during remodeling: what I did before installation

During a recent inspection in a remodel before laying the finish. The problem was that the floor seemed acceptable, but the straightedge showed unevenness that would affect doors and furniture. At first, it didn't seem serious, but in a real work environment, that type of detail can affect timelines, costs, or client trust. First, I protected the operation and then went to the root cause. We…