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

https://www.insert-bookmark.win/single-ply-roof-guarantees-usually-cover-15-20-years-but-the-actual-roof-can

Single ply roof guarantees usually cover 15-20 years, focusing on material defects rather than actual wear and tear. In reality, these roofs often last 25-40 years with proper care