Single ply roof guarantees often cover 15-20 years, but the actual service life...

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

Single ply roof guarantees often cover 15-20 years, but the actual service life can stretch to 25-40 years with proper care. These warranties focus on materials, not wear and tear or maintenance