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.

  • 1
    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, 2015 at 20:02
  • What is your current ceiling height? What is the minimum ceiling height you are willing to accept?
    – Jasper
    Jan 20, 2015 at 1:32
  • What about glueing it down?
    – user31864
    Jan 20, 2015 at 16:11

1 Answer 1


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?

  • Wet plywood sandwich, my favorite.
    – Mazura
    Jan 9, 2020 at 2:33

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