How To Install Backer Board To Concrete Floor

Next place a sheet of the backer board over the wet adhesive.

How to install backer board to concrete floor.

Screws every 6 in. You are only cutting through the fiberglass mesh on the surface. With the plywood in place install the backer board as you normally would. Remember that it is best when joints in the backer board are not aligned with the joints in the subfloor.

Cement board screws spaced every 4 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. Leave 1 8 inch between sheets and cuts.

With the straight edge in place over your mark cut through the surface of the board with the knife. Plan so the joints in the backerboard won t line up with the joints in the subfloor. 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. The backerboard should completely cover the subfloor joints.

Using a notched trowel apply a leveling bed of thinset mortar over the subfloor and embed the backer board sheets into the adhesive. Use a chalk line to mark the dimension of the backer board sheets onto the floor. 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. Then spread thinset mortar with the flat side of a 1 4 in.

Notched trowel and use the notched edge to comb the mortar. Spread the mortar to about 3 16 thickness. Using the trowel spread adhesive and ridge it with the notched side of the trowel. Plan the placement of the cement backerboard sheets.

Measure and cut the cement board to fit in around the whole sheets. Bc plywood over the old subfloor using construction adhesive and driving 1 1 4 in. Mark the cut on the cement board using the straight edge and pencil. For highly wet areas such as showers and bathtub surrounds cement board typically is attached directly over the wall studs and the studs may be covered with an intervening moisture membrane.

Precut and fit all the cement board and then lift all of the cement boards out. Add a layer of 1 2 in. The plywood adds stiffness and stability to the floor.