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

https://telegra.ph/Incompatible-Adhesives-on-Single-Ply-Roofs---What-Happens-07-31

Single ply roof guarantees typically cover 15-20 years, focusing on material defects and workmanship. However, the actual service life can stretch well beyond 25-40 years with proper care