Seal Between Hardibacker Floor

The corners and edges of the sheets should not touch one another.

Seal between hardibacker floor.

Seal narrow cracks with paintable or clear latex caulk either at the top or along the bottom where the baseboards meet the floor. Leave a 1 4 inch gap between the backerboard and the wall. Run the drywall knife over the mortar to create a smooth finish and remove any excess material. Take a trowel or a taping knife and use it to apply the thinset to the gap.

Mix thin set mortar according to the manufacturer s instructions and apply a thin coat over the fiberglass tape with a drywall knife. You will also use it to attach the tile to the backer board. I plan to run a bead of caulk silicone on the tub deck before putting the metal schluter strip in position. Thank you once again for your invaluable help.

Leave a 1 8 inch gap between each backerboard sheet. You need to make sure that the entire gap between the boards is filled up with the thinset. Backer board by strip of ditra underlayment mesh tape joining strip of underlayment to backer board thinset kerdiband more thinset leg of shiene tile edging thinset and finally tiles. Apply some thinset to the gap.

Run a continuous bead of caulk along the gap and smooth it with a. Push the mortar through the mesh tape and into the 1 8 inch space between the backer board and the drywall.