Lay the first sheet of cement board onto the mortar so the rough side of the board is facing up.

Tile over vinyl flooring using cement board. Do not use an uncoupling membrane if the floor squeaks or has any give when you walk on it. I used plywood but it is warping. The edges of the cement board should be no closer than 8 inches to the joints in the subflooring. You can however use an uncoupling membrane over a single layer of sheet vinyl or vinyl tile.

If you don t want to use cementboard install another layer of plywood before using an uncoupling membrane. Apply adhesive to floor. This is a mixture of cement fine grain sand and water that will adhere the new tile to the old. Use a notched trowel to apply thin set adhesive to the vinyl flooring.

Use a thin set product to install ceramic tile over existing tiles. I have installed it over ceramic tile in the kitchen but had to raise the dining floor 1 4 of an inch. 1 remove both layers of vinyl before tile install. Lay the cement backer board on the floor while the thin set is still wet.

Attach the backer board to the floor using self countersinking screws such as backer on screws available at the home depot. Leave a 1 4 inch gap between the board and any adjacent walls. 3 spread a thin layer of concrete over the vinyl and install tile. 2 install and nail backerboard over the vinyl then install tile.

Opt for a silicone sealant around the edge of the room rather than solid filler. If thickness is an issue however 1 4 inch thick backer board can be safely installed. The plan is to install 12 12 ceramic tile. Place the first cement board sheet.

When it comes to mortar latex or epoxy options are best for installing tile over tile. I ve been told to. My thought is possibly using cement board to build it up. Most vinyl tile floors are thin enough to support the extra thickness of both the backer board and the tile.

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