Single ply roof guarantees typically cover 15-20 years, focusing on materials...

https://ace-wiki.win/index.php/What_Parts_of_a_Membrane_Roof_Usually_Fail_First%3F

Single ply roof guarantees typically cover 15-20 years, focusing on materials and workmanship under ideal conditions. But in reality, these roofs can last 25-40 years if well maintained. Factors like weather, foot traffic, and drainage impact longevity