Single ply roof guarantees usually cover 15-20 years, but these membranes can...

https://www.apu-bookmarks.win/single-ply-roof-guarantees-typically-cover-15-20-years-but-the-actual-roof-can

Single ply roof guarantees usually cover 15-20 years, but these membranes can last 25-40 years with proper care. The guarantee mainly covers materials, not wear and tear or maintenance issues