A.Howard Brickman responds: Concrete is a good substrate for installing wood flooring if proper precautions are taken to ensure that excessive moisture conditions are detected prior to installation,and controlled during the life of the floor. In addition, traditional nail-down, solid 3/4-inch strip or plank flooring must have an adequate wood substrate for proper nailing.

Concrete substrates. Even though concrete was used to build Hoover Dam, it doesn’t qualify as a "waterproof" material. Actually, the opposite is true. Concrete is quite porous.

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