The first method to fix a warped floor is to sand it.
How to fix bowed wood flooring.
Sand down the bump in your flooring until it is level with the rest of the floor.
Water causes the wood to expand and shrink.
Wood floors usually become warped because of water damage although too much sunlight can also cause boards to warp.
Sometimes even a nearby water source like flooding underneath the house can cause enough of a moisture imbalance to result in warping.
Most often a warped wood floor is caused by standing water or heavy moisture below the floor due to an unidentified leak or other hidden water source.
If water has seeped into the boards they may swell against one another which can cause the bow.
Cover the warped hardwood specifically the concave portion of the wood with moist paper towels.
Wood responds to changes in temperature or humidity by warping and that can be bad news for your hardwood floor.
Many floor boards that are warped will need to be removed and replaced.
Again to bring the wood back to its normal shape you must concentrate on the concave section.
Just like in the other methods you should rinse the paper towels under water and wring out the excess.
Over the course of time this will lead to warping.
How to fix bowed floors.
How to straighten a warped floor.
Sanding down a warped floor.