Single ply roofing guarantees often cover 15-20 years, but the real service...

https://www.blaze-bookmarks.win/single-ply-roof-guarantees-usually-cover-15-20-years-but-the-actual-roof-can-1

Single ply roofing guarantees often cover 15-20 years, but the real service life can stretch to 25-40 years with proper care. The guarantee usually focuses on materials, not wear and tear or maintenance