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

https://brooksfznx367.theburnward.com/how-can-i-tell-if-a-leak-is-workmanship-or-material-failure

Single ply roof guarantees typically cover 15-20 years, reflecting the manufacturer’s confidence in materials, not the full service life, which can stretch to 25-40 years with proper care