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

https://www.slideserve.com/gwyneyxcez/why-do-roof-problems-show-up-after-two-winters

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