A buckled floor happens when the boards warp and lift up from the subfloor that they are attached to. You’ll most likely need to call in a hardwood floor installer to identify the root of the problem if buckling is an issue. Once the cause of your buckling has been identified, you’ll need to take the necessary measures to ensure that your hardwood planks are firmly attached to the subfloor so that the problem no longer persists. Hardwood Floor

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
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