How To Install Backer Board To Concrete Floor

Measure and cut the cement board to fit in around the whole sheets.

How to install backer board to concrete floor.

With the straight edge in place over your mark cut through the surface of the board with the knife. Do a dry run and lay the backerboard down to fully cover the area you plan to tile. Using the trowel spread adhesive and ridge it with the notched side of the trowel. Embed the cement board and screw it to the underlayment with special 1 1 4 in.

Plan so the joints in the backerboard won t line up with the joints in the subfloor. Add more mortar as necessary to fill sunken areas in. Mark the cut on the cement board using the straight edge and pencil. 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.

Screws every 6 in. The backerboard should completely cover the subfloor joints. Cement board screws spaced every 4 in. Plan the placement of the cement backerboard sheets.

The plywood adds stiffness and stability to the floor. Add a layer of 1 2 in. Lay the backer board according to the manufacturer s instructions. Using a notched trowel apply a leveling bed of thinset mortar over the subfloor and embed the backer board sheets into the adhesive.

Spread the mortar to about 3 16 thickness. With the plywood in place install the backer board as you normally would. Leave 1 8 inch between sheets and cuts. Bc plywood over the old subfloor using construction adhesive and driving 1 1 4 in.

You are only cutting through the fiberglass mesh on the surface. 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. Precut and fit all the cement board and then lift all of the cement boards out. 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.

Next place a sheet of the backer board over the wet adhesive. Remember that it is best when joints in the backer board are not aligned with the joints in the subfloor. Notched trowel and use the notched edge to comb the mortar.