Sleeper Floor Over Concrete. Lay 6-mil polyethylene sheeting over the concrete to minimize moisture migration from the concrete up into the wood flooring. In case it matters.
Treated plywood to the concrete with concrete screws spaced every 16 in. Moisture can cause floors to warp and provide a breeding ground for mold. There are no utilities nor drain in the floor.
The sleeper-plus-plywood method adds another 1 12 inches raising the floor level a total of about 3 inches.
Avoid a sleeper layout where the boards are parallel to the joists but run between them because this configuration lacks structural support. Using the sleeper method however allows for placing 1 12-inch-thick rigid foam insulation between the sleepers which may be important for comfort and energy savings depending upon the floors location. Ron stopped by the Mr Floor showroom to find out why wood floors squeak and what can be done about them. You can attach wood sleepers to the floor fill the gaps with rigid-foam insulation and then apply your finish flooring.
