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

https://telegra.ph/If-I-Only-Do-One-Thing-This-Year-What-Roof-Maintenance-Is-Most-Important-07-31

Single ply roof guarantees typically cover 15-20 years, but the roof can actually last 25-40 years with proper care. The guarantee focuses on materials and workmanship, not long-term wear and tear