When used on bare concrete and terrazzo-covered floors with a thickness of 1/4'' (6.35mm) or greater, this mudcap must be used. Must be ordered separately. NOTE: Must be used with RFB119-TS (Tile Spacer, see below) for terrazzo heights greater than 1/4'' (6.35mm). Use one spacer for 3/8'' (9.54mm) thick tile. Use two spacers for 1/2'' (12.70mm) thick tile.