Single ply roof guarantees typically last 15-20 years, but the roof itself can...

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

Single ply roof guarantees typically last 15-20 years, but the roof itself can often go well beyond that—sometimes 25-40 years in real life. Guarantees cover manufacturing defects, not wear and tear or poor maintenance