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How to remove floor boards
Determine what to do with the wood.
If the wood is still in fairly good condition, you might want to consider selling or donating it.
If, on the other hand, the wood is mostly rotten, there may not be much to salvage.
In that case, discarding it is probably the most practical thing to do. For wood that you plan to sell, you should work carefully to minimize the amount of damage you do to the boards when removing them.