Boilermaker27
New Member
I finally made up my mind and decided to go with a new cast iron bathtub from Lowes, Kohler and it was on sale for $269, I think they wanted to get rid of it. Anyway, looking at the tub after I took off the wooden crate top I noticed there was not a very large flange around the back and two sides. I know the acrylic bathtubs have a flange that sticks up about 3/4 inch and you put your cement board down to the bottom of the flange and that creates the seal. Being cast iron the flange is a bit thick and I cannot pull the cement board out to rest the cement board on the top of the tub. What is the best way to create a water tight seal between the bottom of the cement board and the top of the flange on the tub?