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

https://fast-wiki.win/index.php/EPDM_Roof_Lifespan_-_Can_It_Really_Go_Past_35_Years%3F

Single ply roof guarantees typically cover 15-20 years, but the actual roof can last 25-40 years with proper care. Guarantees focus on materials and installation, not wear and tear over time