With RHINOROOF you can break free from felt! It’s 100% synthetic high strength design is 20x stronger than 15lb felt. It is an excellent barrier against air, water, and vapor. It will not dry out, crack, or leach oils in the heat. Available in 42” width and 286’ runs allowing fewer laps, cuts, and easier roll handling. The longer runs also ensure more jobs in less time with less labor. RHINOROOF underlayment is lightweight and slip-resistant. It will remain in contact and dried-in. Can be used in low temperatures without becoming stiff and difficult to unroll. Won’t absorb water or wrinkle. It lays flat and remains 100% impervious to mold.