Kirb-Perfect was designed to eliminate the need to attach cementatious backer board or wire lath to a vinyl wrapped, 2x4 stacked shower curb. Kirb-Perfect will not puncture the top or inside of the pan membrane, thus reducing the risk of leakage and preserving the integrity of the liner. Secured with nails on the outside wall of the curb is sufficient to hold Kirb-Perfect in place. Also, Kirb-Perfect can be used without the presence of wood altogether; it will stand with the vinyl liner held up in the center of the cage, making it simple to add a light weight mud to both sides of the pan material while filling. The top panel is then attached using the stainless screws provided. Kirb-Perfect is then screeded full to provide a cement backing on which to adhere ceramic, porcelain or stone tile.