Inexpensive solution for lining shower stalls, saunas, floor drains, or sunken tubs Can be custom cut to fit the dimensions needed Flexible and easily workable Water tight when properly installed 40 Mil PVC PermaGard PVC Shower Pan Liner 6ft is distinctive 40 mil PVC grey with bold markings. Continuously marked on the roll and lined every 6 inches to assist in cutting. PermaGard PVC Pan Liner will not rust, rot or decay under normal and recommended conditions for the life of the installation. PermaGard PVC Shower Pan Liner 6ft is not recommended for continuous exposure to the sun environment. No underlayment required with using PermaGard PVC Pan Liner. Meets FHA and HUD requirements for shower pans and ASTM D-4551 Requirements