Single ply roof guarantees typically cover 15-20 years, but the actual roof can...

https://www.bookmark-xray.win/single-ply-roof-guarantees-often-cover-15-20-years-but-the-actual-service-life

Single ply roof guarantees typically cover 15-20 years, but the actual roof can last 25-40 years with proper care. Guarantees focus on the material’s performance, not the whole system or wear and tear