Floor Tile Backer Board Or Subfloor

An additional layer of thinset is then applied to the surface of the backer board and used to set the tiles.

Floor tile backer board or subfloor.

The backerboard should completely cover the subfloor joints. Cement based backer board. When installing a ceramic tile floor on a concrete subfloor you don t have to worry about flexing as long as the concrete slab is at least 1 1 8 inch thick which most slabs are. Floor tiles should be installed over smooth flat surfaces.

According to backer board manufacturers and tile setters installing backer board directly over an old solid wood subfloor is risky for a couple of reasons. Plan so the joints in the backerboard won t line up with the joints in the subfloor. Cement board is the most durable trouble free tile backer for tub surrounds showers floors and all other wet areas. Add more mortar as necessary to fill sunken areas in.

Also if your subfloor runs east to west lay your backer boards in the opposite direction north to south. The backer board is then secured with screws to the subfloor beneath. Leave a 1 4 inch gap between the edges of the backer board and the walls to allow for subfloor expansion and contraction. Its made from cement and sand and is reinforced by fiberglass mats on both sides so it s impervious to water.

The backer board comes in different sizes and you will pick the right one depending on the type of floor you are installing. If the subfloor doesn t have enough stability you can usually but not always remedy the situation by installing cement backer board also called cementboard. Good luck with your project. After all backer board sheets are in position remove the 16d common nails.

Spread the mortar to about 3 16 thickness. So the answer is yes you would need to install a plywood subfloor under the cement backer board before applying the tile. If needed cut the backerboard to fit in small spaces or around obstructions. The thickness of the subfloor including the cement backer board should be a minimum of 1 1 8 thick so if you use 1 2 backer board you would need at least 5 8 plywood.

Second the strength of wood boards isn t always consistent. Now largely regarded as the very best underlayment for ceramic tile in any application floors walls and countertops cement based backer board goes by many names. Lay the backer board according to the manufacturer s instructions. It is generically called cement board or backer board or it can also be referred to by one of the common brand names such as densshield hardiebacker and wonderboard.

First changes in humidity make solid wood shrink swell and cup more than plywood.