Single ply roof guarantees usually last 15-20 years, but the roof’s real...

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

Single ply roof guarantees usually last 15-20 years, but the roof’s real service life can stretch to 25-40 years. Guarantees cover materials and workmanship, but don’t always factor in weathering or maintenance