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

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

Single ply roof guarantees usually cover 15-20 years, but the actual roof can last 25-40 years with proper care. Guarantees focus on materials and workmanship, not wear and tear or maintenance issues