Tommy Mac Discussions › Forums › Fix-it Forum: Home Improvement & Do It Yourself Repair Forum › installing ceramic tile › Mortar And Screw….
Follow the instructions on the Hardibacker cement board. The mortar prevents any cement board movement due to uneven floors underneath. Makes for a stronger installation. I personally like a latex modified mortar such as TEC 345. You can use it to install the cement board, fill the joints, and to install the tile.