Single ply roof guarantees usually cover 15-20 years, but in reality, these...

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

Single ply roof guarantees usually cover 15-20 years, but in reality, these roofs can last 25-40 years if looked after properly. Guarantees focus on materials and installation, not daily wear and tear