tiling a shower wall. if i tile one wall with tile, do i set that tile all the way to the end of the wall or do i leave a gap (1/8) in. or do i keep it against the wall then on the wall next to it, do i set that tile to where it is flat against the tile onthe wall tiled already? or do i just make sure that tiles have a 1/8 gap between them?:huh:then grout or caulk?