Bullnose Tile For Shower Curb . It include design considerations , measu. If you are going to be using radius bullnose for the top of your curb, you will need to raise the mud about a half inch above the tops of the tiles. Before and After; Saving Timbers Midwest Mosaic, Inc. from www.midwestmosaic.us The contractor said that it made no sense to him to use. I absolutely love to use a slab material as a transition when i can. Schluter is a tile edge trim material that is usually made from aluminum or stainless steel.