How To Install Backer Board To Concrete Floor

Leave 1 8 inch between sheets and cuts.

How to install backer board to concrete floor.

The backerboard should completely cover the subfloor joints. Cement board screws spaced every 4 in. Plan so the joints in the backerboard won t line up with the joints in the subfloor. Add a layer of 1 2 in.

The various brands of cement board such as hardiebacker durock denshield and wonderboard have become a standard tile backer material for nearly all ceramic porcelain and stone tiles for floor wall and countertop applications. Do a dry run and lay the backerboard down to fully cover the area you plan to tile. The plywood adds stiffness and stability to the floor. You are only cutting through the fiberglass mesh on the surface.

Mark the cut on the cement board using the straight edge and pencil. Notched trowel and use the notched edge to comb the mortar. Using a notched trowel apply a leveling bed of thinset mortar over the subfloor and embed the backer board sheets into the adhesive. These convenient panels of cementitious board provide an instant flat hard surface that bonds with the thin set adhesives or mortars used to install tile.

There is no need to install backer board on a concrete substrate ceramic tile can be applied right over concrete provided the surface is flat smooth and free of significant cracks. Embed the cement board and screw it to the underlayment with special 1 1 4 in. Next place a sheet of the backer board over the wet adhesive. Plan the placement of the cement backerboard sheets.

With the straight edge in place over your mark cut through the surface of the board with the knife. Lay the backer board according to the manufacturer s instructions. Add more mortar as necessary to fill sunken areas in. Measure and cut the cement board to fit in around the whole sheets.

Spread the mortar to about 3 16 thickness. Using the trowel spread adhesive and ridge it with the notched side of the trowel. Screws every 6 in. Use a chalk line to mark the dimension of the backer board sheets onto the floor.

Then spread thinset mortar with the flat side of a 1 4 in. Bc plywood over the old subfloor using construction adhesive and driving 1 1 4 in. With the plywood in place install the backer board as you normally would.