Single ply roof guarantees, usually 15-20 years, cover specific materials and...

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

Single ply roof guarantees, usually 15-20 years, cover specific materials and workmanship under set conditions, but real service life often extends to 25-40 years with proper care