Single ply roof guarantees usually cover 15-20 years, focusing on 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 cover 15-20 years, focusing on materials and workmanship. But the real service life can stretch to 25-40 years with good care