Plywood Over Concrete For Underlayment

Nevertheless this is not all that uncommon.

Plywood over concrete for underlayment. The preferred underlayment for vinyl flooring is 1 4 plywood. Some installers will lay vinyl over existing osb or plywood subflooring if it is in excellent condition. Tap down on the plywood with a cement block to ensure all air bubbles are expelled. The reverse concrete over plywood.

Nail down subfloor system get 3 4 inch minimum cd exposure 1 plywood subfloor panels 4 foot by 8 foot sheets. It might be done to create a subfloor for ceramic tile to be installed over an existing wood subfloor or for making a concrete countertop. Treated plywood to the concrete with concrete screws spaced every 16 in. Wood panels such as plywood or oriented strand board are common subfloor choices.

However because wood is a naturally porous substance that will absorb moisture when used as a basement subfloor these materials are often installed on mini joists known as sleepers which allow it to sit above a concrete pad. Repeat the process for all of the other pieces of plywood that need to adhere to the concrete. If necessary add vapor retarder before applying underlayment especially recommended if 3 4 inch wood flooring is installed over concrete. Plywood underlayment is a thin plywood material that is most commonly used under resilient flooring materials such as vinyl and linoleum sheets and tiles.

Unlike other underlayment products you can use it with confidence over concrete surfaces without needing to first perform a calcium chloride test of the slab. On projects where deflection of the plywood is a concern some manufacturers recommend applying the underlayment over two layers of 3 4 inch plywood for better rigidity. Reviewers frequently state how simple it was to install this floor underlayment and how incredibly cushioned the floor feels. Once you ve installed a vapor retarder install your subfloor.

Run your hands over the surface of the plywood and push down firmly to secure it in place. Plywood is available in 4 x8 and 4 x4 sheets. Pouring concrete over plywood can be even more challenging than installing plywood over concrete. Installation over concrete with a calcium carbide reading of greater than 2 5 percent.

It s best to place the underlayment over 3 4 inch thick plywood fastened with screws at 12 to 16 inch intervals to help decrease deflection and add stability. Alternatively screw rows of treated 1x4s to the concrete 16 in.