How to fix uneven floors?

Uneven floors are fixed by first identifying why the floor slopes, sags, dips, or moves. The cause may be in the subfloor, but it can also come from weakened joists, damaged beams, failing posts, moisture damage, settlement, or earlier alterations. NK Construction & Design evaluates the floor system and the structure below it before determining whether the repair should involve joist reinforcement or sistering, beam or post work, damaged-wood replacement, structural correction, subfloor leveling, or a combination of repairs. Leveling only the visible surface can leave an underlying structural problem unresolved.