Single ply roof guarantees usually cover 15-20 years, reflecting the...

https://melissafreshmaid.com/tpo-vs-pvc-lifespan-what-matters-more-than-the-material/

Single ply roof guarantees usually cover 15-20 years, reflecting the manufacturer's confidence in the material under ideal conditions. But in reality, with proper care, these roofs often last 25-40 years