Use a pry bar to remove any protruding nails and vacuum up the demolition debris.
Flooring underlayment warped.
Pour a generous amount of mixed leveler onto the subfloor focusing on one or more wavy areas.
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Note the locations of joists and secure the new subfloor to the joist using wood screws.
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Spread the leveler over the floor with a trowel or a gauge rake so it covers each low area completely.
Sometimes even a nearby water source like flooding underneath the house can cause enough of a moisture imbalance to result in warping.
If the flooring is linoleum or laminate fixing the underlayment requires removing the flooring restapling the underlayment to the subfloor and then installing new flooring.
Replace the removed warped subfloor sheet with a new one.
If you can feel a soft spot in the floor under the carpet the subfloor has likely been weakened or damaged.
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Mix the floor leveling compound with water in a bucket following the manufacturer s directions.
Remove the damaged floor material.
When a subfloor becomes warped or delaminated swells and deteriorates it is no longer level or structurally sound.
Find the water source.
This isn t the same as having a floor squeak when you step on it which simply indicates that the subfloor isn t tightly fastened to the floor joist in one area.
If moisture or water damage happens to the flooring it must be taken care of immediately in order to minimize the long term effects that humidity could have on the wood.
Start by completely removing the damaged materials.
The best remedy is replacing damaged subfloor panels with new ones.