Installing Plywood Floor Final Over Concrete

Before you install file flooring follow the directions above for fixing high spots and low spots in a wood or concrete subfloor.

Installing plywood floor final over concrete.

Score the back of the panels the thickness on a 12 x 12 grid. Install carlisle wide plank floors milled to 1 2 inch thickness by blind nailing and gluing. Lay 6 mil polyethylene sheeting over the concrete to minimize moisture migration from the concrete up into the wood flooring. Then vacuum the floor with a wet dry vac or sweep it with a broom.

Alternatively screw rows of treated 1x4s to the concrete 16 in. This may be as simple as a 6 mil polyethylene plastic covering 100 percent of the concrete and brought up all walls then trimmed after the floor has been installed. Apply an adhesive approved for the installation of plywood per the plywood manufacturer s recommendat ions. Score the back of the panels half of the thickness on a 12 inch by 12 inch grid.

Duraamen s param 5500 goes on thin in a 3 8 to 1 2 thick application. It looks like a sheet of dimples or very large bubble wrap. Concrete has moisture in it and your wood will mold and rot over time. It lays down ultra flat.

Treated plywood to the concrete with concrete screws spaced every 16 in. Apply an adhesive approved for plywood installation and recommended by the plywood manufacturer. After installing a vapor retarder if necessary cut your plywood panels into 2 x8 or 4 x4 sections. Install it at right angles to the existing with the seams staggered to stabilize the floor.

An additional layer of 3 4 plywood should be installed with screws over the existing subfloor. Galvanized metal lath should then be installed over the plywood as a reinforcing material and to help the concrete to bond to the plywood. As with a floated subfloor nwfa recommends a vapor retarder for glue down subfloors when installing wood flooring over concrete. When installed correctly your concrete over plywood floor will not permit moisture through will not warp or buckle and will come with all the benefits of concrete in an easy to care for floor.

Make a final check with the level to be sure all the high and low spots are gone. Don t glue the plywood to the concrete. The nwfa recommends plywood with a minimal thickness of. Concrete slab with plywood sub floor 1 1 2 inches or more height allowance lay down 3 4 inch plywood and then follow the directions above.

There is a product you can buy from your local home depot store for putting under a floor over concrete. For floated wood subfloors installed on grade and below grade be certain moisture control is taken into account.