How To Level Plywood Bathroom Floor Before Installing Backer Board

Screws every 6 in.

How to level plywood bathroom floor before installing backer board.

Using the trowel spread adhesive and ridge it with the notched side of the trowel. Using a notched trowel apply a leveling bed of thinset mortar over the subfloor and embed the backer board sheets into the adhesive. If the area is very large use a long straight 2 in 4 in 5 1 cm 10 2 cm board and set your level on top of it. The plywood adds stiffness and stability to the floor.

Add more mortar as necessary to fill sunken areas in. In order to level the subfloor to install tile the builder suggests 1 to put a paper on plywood and pour self leveler and skip hardibacker. Floors are rarely perfectly level. Leave a 1 4 gap between the backer board and walls and 1 16 gap between the sheets of backer board.

2 to pour self leveler on plywood directly and skip hardiback. And 3 grind the hump of the plywood. Lay the backer board according to the manufacturer s instructions. Mix up and apply a modified thinset to a large enough area of the plywood subfloor to cover each piece of backer board using a 1 4 x 1 4 notched trowel.

Next place a sheet of the backer board over the wet adhesive. Bc plywood over the old subfloor using construction adhesive and driving 1 1 4 in. Spread the mortar to about 3 16 thickness. If the floor is uneven lift up the board until it is level so you ll know how much flooring compound you ll need to even it out.

Add a layer of 1 2 in. With the plywood in place install the backer board as you normally would. Use a chalk line to mark the dimension of the backer board sheets onto the floor. Remember that it is best when joints in the backer board are not aligned with the joints in the subfloor.