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.
This process begins with the same treatment process that the rotary peel method uses. However, instead of being sliced in a rotary fashion, with this technique the wood is sliced from the log in much the same manner that lumber is sawn from a log – straight through. The veneers do not go through the same manufacturing process as rotary peeled veneers. Engineered hardwood produced this way tends to have fewer problems with "face checking", and also does not have the same plywood appearance in the grain.[3] However, the planks can tend to have edge splintering and cracking because the veneers have been submerged in water and then pressed flat. Denver Hardwood Floors

Most floors use a tongue-and-groove design for connecting adjacent strips. This design makes replacing a single strip or plank challenging, but not impossible. First, look for any nails in the damaged board and drive them as far through the board as possible by using a hammer and nail set. Carpenters use nail sets to drive nails flush with trim without damaging the trim with a hammer. After you’ve cleared the nails, it’s time to remove the damaged board and install a new one. Follow these steps: Hardwood Floors
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