Single ply roof guarantees usually cover 15-20 years, while the actual service...

https://www.emergbook.win/single-ply-roof-guarantees-often-cover-15-20-years-but-the-actual-service-life-1

Single ply roof guarantees usually cover 15-20 years, while the actual service life can stretch to 25-40 years with proper care. The guarantees focus on manufacturer defects, not wear and tear from weather or usage