Made from durable interlocking PVC components, this Zip-Up underdeck system creates a watertight water barrier that channels water to effective drainage. The system provides a clean, grid-free flat, non-corrugated, washable, mold- and mildew-resistant paintable ceiling surface. Installation is accomplished easily with the five-component screw-in and zip-in-place system. Panels are available in three finishes and two colors. The main rails and panels are available in 12- and 16-foot lengths.