This is in regards to a question posted on Nov. 26, 1997, We are installing an Americast bathtub and then plan to put 1/2" backerboard around the stall and then tile it. You mention that you can avoid shimming the whole wall, and install the cement board above the flange of the tub and not over it. if you do it this way, how do you tile it and not have a huge gap between the tub and the bottom edge of the tile? Do you fill it all in with silicone? can you drop the bottom edge of the tile down below the cement board to lessen the gap? I guess this is more of a tiling question but if you have any advice it's appreciated.