Even the best wood floors are subject to problems. For starters, wood is more likely to scratch than other flooring. Other problems can range from minor surface damage to serious structural defects to the most annoying problem wood floors fall prey to: squeaks.

There isn't an easy way to avoid surface scratches and gouges--they're the result of daily wear and tear. Nor can you prevent problems caused by expansion and contraction. Wood, as a naturally fibrous and porous material, expands and contracts with changes in temperature or humidity. As it does so, boards can separate or warp and nails can loosen.

The natural settling of a house can also cause separations between the joists and the subfloor. If your floor is sagging or uneven, there could be a serious structural problem causing it; consult a professional.

To maintain wood floors, vacuum or dry-mop them about once a week. Don't ever wax a wood floor that has been coated with a polyurethane finish--this will make it impossible to re-coat it in the future without first sanding it.