Single ply roof guarantees, usually 15-20 years, cover materials and...

https://trevorsinspiringnews.yousher.com/what-are-the-realistic-lifespan-ranges-for-tpo-pvc-and-epdm

Single ply roof guarantees, usually 15-20 years, cover materials and workmanship but don’t always reflect the roof’s real service life, which can last 25-40 years with proper care