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

https://andreocln282.lucialpiazzale.com/pvc-single-ply-roof-lifespan-is-30-years-realistic

Single ply roof guarantees, usually 15-20 years, cover specific materials and workmanship under set conditions, but real service life often extends to 25-40 years with proper care