Duro-Last is also very durable under any weather conditions. Duro-Last is a type of single-ply roof membrane. It is a proprietary blend of P.V.C. that has UV stabilizers, algaecides, chemical and fire-resistant agents mixed into it during the manufacturing process. Since it is not added after manufacturing on the surface it will not wear off over time. This is what allows them to give such a good warranty. Ask for job specific information on Duro-Last manufacturing!