The Kirb-Perfect is recommended to be used, rather than cement board or lath over the curb, as the Kirb-Perfect only requires screws on the outside of the shower rather than with cement board and lath requiring screws on the inside, top, and outside of the curb. When screws are used on the inside and top of the curb framing, it opens your shower to water damage as the water will pour over the curb and inside of the curb and potentially get to the wood framing through the holes. Silicone over the screws does not always make the screw holes water-tight.
With molded in dovetail connecting lugs, this curb can be used for multiple length installations. Each piece of the Kirb-Perfect Shower Curb is easily cut with a hacksaw, PVC cutters or angle grinder. Kirb-Perfect comes complete with two 5-1/2" H x 30" L side panels, and one 4 1/2" W x 30" L top panel. Also supplied are two (1 1/4" long) and eight (3/4" long) stainless steel self tapping screws and illustrated installation instructions. If are looking to add additional Kirb-Perfect to your order, don't forget to order additional Bituthene Curb Waterproofing.
If you are worried that you may not have enough space for a 4 1/2" curb between your shower and your toilet/vanity, think about adjusting your curb slightly towards the inside of your shower.