Tile Over Plywood Vs Cement Board

As a result the grout lines and the tiles themselves can crack and become damaged.

Tile over plywood vs cement board.

They were supposed to rip out the plywood put down hardie board and then tile. Cement board also provides an additional layer over a plywood or particleboard subfloor adding stiffness to the tile installation to help prevent cracks. In this highly convenient inexpensive and popular application a moisture barrier of 4 or 6 mil thick plastic is installed directly over the wall studs. While most floor tile these days is installed onto a layer of cement board or similar backerboard it is possible to lay tile directly over plywood.

The tile runs from our utility room through the kitchen hall bathroom and foyer. Ok so we had 603 square feet of porcelain tile installed through the first floor of our home. Cement backerboard is designed specifically for this use. Then the cement board is installed on top of the plastic sheeting.

In addition to this tile can not properly adhere to wood the way it does to concrete. The installers tore out the old tile which was installed over plywood. But a number of precautions must be taken to ensure a successful installation. Cement board is a type of underlayment that is now standard for most tile installations but particularly for floor tile.

Plywood is porous and not designed for use with most of today s latex based thinset mortars. For ceramic tile floors the cement board usually rests on a plywood subfloor minimum 5 8 inch thick exterior grade plywood or osb. Screws secure the cement board to the wall studs. Tile is laid onto the cement board with thinset mortar or mastic.

The primary benefit of cement board is that it doesn t break down or expand or warp if it gets wet. Instead of laying tile on a plywood subfloor it s better to lay a cement board on top of the plywood subfloor first. Even if you use a waterproof underlayment membrane the floor will still be either 1 4 or 1 2 higher than the subfloor plus the thickness of the tile and adhesive. A 3 4 inch plywood subfloor on a joist structure with 24 inch spacing needs the extra thickness of cementboard or the floor will flex and the tiles will crack.

This is a distinct advantage over plywood and drywall. While i prefer using 1 2 cement backer board over a plywood subfloor you may be able to get by with 1 4 backer board instead. The best argument when determining whether to use plywood or cement board under tile is in the adhesive process.