Kirb-Perfect shower curb is a stay-in-place plastic form for building perfect shower curbs. The assembled Kirb slides over 2 or 3 stacked, 40 mil vinyl liner wrapped 2×4’s or 2×3’s but can be used with all waterproofing methods. With molded-in dovetail connecting lugs, this curb can be used for unlimited, multiple-piece length installations. Each section of the Kirb-Perfect Shower Curb is easily cut to fit with a hacksaw, jigsaw, or an angle grinder.