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Tiling bathroom floor question

denali2007
11 years ago

We have torn out the ceramic bathroom floor of 27 years. The floor underneath had a screen with mortar over the top then the 4x4 tiles. We are installing a 12x18 porcelain tile. The floors need some leveling. What type of leveling agent should we use? Would this go on top of the hardie backerboard or below it?

TIA