Does the cement board go over the lip of the tub, or does it sit on that lip?
it goes on top of that lip not over it tile goes over the lip make sure you have a gap between the tub and tile when setting a spacer will do. silicone the bottom row of tile to the tub after the tiles have been set and grout the rest I caulk the cement board to the lip when I install. Its over kill but adds a layer of safety Good luck
it needs to go over it so water doesnt get behind it
