Bathtub Lip
I bring my denshield down to the top of the lip because furring out the studs means my tile would pop out too and rabbeting the sheet material is a pita and then using a putty knife filling that gap and smoothing it out with wedi sealant.
Bathtub lip. Apply it to the wall with the bottom edge about 1 4 in. I understand that the greenboard must be above the lip of the bathtub not overlapping or underlapping however using this method will create a 1 gap the length of the lip between the top of the tub minus the lip and the beginning of the drywall. When the kerdi board is installed flush with the lip of the tub. As i was told to do i ran the hardiebacker to just above the lip of the bathtub.
Hold the sheet against the wall and insert 1 4 inch spacers to keep the cement board 1 4 inch above the tub s lip. Apply kerdi fix or other suitable sealant to the lip of the tub and spread using a small notched trowel. Cement board overhanging bathtub lip. A walk in bathtub is a bathtub that is elevated higher with a door on the side that allows you to walk in and sit in your bathtub.
Then apply a generous amount of thin set to the bottom bathtub tile and position it 1 8 in. While some tubs come with a built in lip others may require a larger l shaped flange to help close a medium sized gap between the tub and wall. The best approach when installing cement board or other tile backer around a tub is to keep the cement board out of the lip area. Jeff as usual great info but i share tom s question regarding whether cement board should stop just before the lip of the tub or should it go over the lip of the tub by maybe 1 8 of the top of the tub.
I am tiling a greenboard wall above a bathtub. Someone in home depot told me that instead of filling the space below the hardiebacker with mortar i should instead fill it with silicone caulk. Above the lip of the tub. Screw the board into place with 1 1 4 inch cement board screws.
Apply schluter set all set fast set or unmodified thin set mortar to the kerdi board using a x 3 16 6 mm x 5 mm v notched trowel or the kerdi trowel.