*DISCLAIMER: Roofing comes in a box; Its important to unpack roofing material as soon as possible to avoid creasing PVC RV roofing is an improved roofing system that does not chalk, fade or leave streaks. This roofing membrane is lightweight which can overtime save on gas mileage. Although its lighter in weight than EPDM RV rubber roof, its amazingly strong and will not puncture, crack or tear. This PVC also keeps its white color by being resistant to sunlight (no discoloration). This single ply roofing system is 0.165 lbs and only 0.028" thick. Update your RV roof today with the 8.5 PVC RV roofing. Recommended for installation If one surface is porous (has small holes or spaces), such as plywood or fiberboard, it is recommended to wet laminate the membrane to the substrate. If both surfaces are non-porous, such as EPS or ISO apply the adhesive to both surfaces 4-5 mils and allow to dry approximately 20-30 minutes, depending on conditions. The adhesive will turn from white to clear when it is dry. Apply membrane to roof deck and roll or broom down the sheet to assure 100% contact area.