Over the years, many hardwood floors develop small splits or cracks in the surface of the wood. These can be spot repaired with some angled nails to secure the two pieces together, along with some wood putty to hide the blemishes. If your floor is suffering from large cracks, however, you might want to think about refinishing the floor. And if the split is particularly bad, you should probably replace the damaged plank altogether. Denver Hardwood Flooring
Eliminate any problem spots to make the subfloor level. Sand minor humps down with a hand-held or orbital sander to make the subfloor level. To fill any dips or low spots, use a leveling compound (also known as floor patch). Mix up the compound according to package directions, fill in the dips, then pull your straight piece of lumber back and forth over the spot to flatten and level it with the rest of the subfloor.[7] Hardwood Floor