Single ply roof guarantees often cover 15-20 years, but the actual service life...

https://archervezi838.lowescouponn.com/do-i-really-need-wind-uplift-calculations-for-a-membrane-roof

Single ply roof guarantees often cover 15-20 years, but the actual service life can stretch 25-40 years with good care. Guarantees mainly cover manufacturing defects, not wear and tear or maintenance lapses