Single ply roofing guarantees typically span 15-20 years, covering material...

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

Single ply roofing guarantees typically span 15-20 years, covering material defects but not the entire roof’s life. In reality, with good care, these roofs can last 25-40 years