To figure out whether a steam mop will damage your floors, determine whether the hardwood floors in your house are sealed. If they are sealed, no damage will be done—if not, they may warp. Unsealed hardwood is vulnerable to moisture damage, so know what kind of flooring you have before you pop out the mop. And if you want to be on the extra-cautious side, avoid steam-mopping your wood floors even if they are sealed. Some experts warn against using any sort of moisture on wood, so just stick to dry cleaning techniques.