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I have a concrete slab and want to put 3/4 wood flooring on top. I'm going to lay a plywood subfloor and want to know if 1/2 inch plywood is good enough. I plan on nailing down the wooden floor.

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    half an inch isn't a lot for a nail to grab into and not go through. A one and half inch cleat will go completely through the half inch plywood and stick out about a 10th of a inch. Typically when installing over concrete slab, you float an engineered floor. A high quality engineered floor will look/last the same as a solid wood. – diceless Jan 19 '15 at 20:02
  • What is your current ceiling height? What is the minimum ceiling height you are willing to accept? – Jasper Jan 20 '15 at 1:32
  • What about glueing it down? – user31864 Jan 20 '15 at 16:11
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Agree with diceless that a floating engineered wooden floor is more normal over a concrete slab. Thermal movement in fully fixed wooden floors causes problematical expansion/contraction more often than not.

Even using stable wood, the humidity in the room will change season to season, as will the temperature of the underlying/surrounding structure, all can affect the appearance of the wooden floor.

Was there a specific design/idea you had in specifying the ply subfloor?

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  • Wet plywood sandwich, my favorite. – Mazura Jan 9 '20 at 2:33

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