Install Ceramic Floor Tile Backer Board. Add more mortar as necessary to fill sunken areas in. Thinset is the adhesive that you will also use to install the ceramic tile. It adheres the backer board to the subfloor, making it stable.
How to Install Hardie Board For Floor Tile - YouTube
In order to install tile over a wood floor, you will need to cover it with cement board. How to install a cement backerboard. Spread the mortar to about 3/16 thickness.
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If the subfloor doesn't have enough stability, you can usually (but not always) remedy the situation by installing cement backer board, also called cementboard. Here are the basics of how to install tile over cement board. This will impact how well your tiles adhere to the subfloor. To achieve the ideal flat surface, most contractors rely on the backer board.
