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claypa wrote: In most climates, moisture will condense on wood against a concrete floor. It could be done with furring strips of pressure treated wood laid on the concrete, then a subfloor of 3/4" plywood on that. To fasten wood to concrete, there are nailers for that purpose. Some brands are ramset, redhead, remington etc. They use hardened steel nails driven by a .22 cartridge. Any large building supply or rental store has them. Needless to say, it is loud and potentially dangerous... If it's a new concrete floor, you may be able to use 'cut nails'. This all would subtract a few inches of height from the room, maybe not an issue, maybe. It also creates issues with doors, stairs, etc. You get a little flex in the floor too, which is more comfortable to stand and walk on. (or lie on ;)P