Single ply roof guarantees usually last 15-20 years, but the real service life...

https://www.runway-bookmarks.win/single-ply-roof-guarantees-usually-cover-15-20-years-reflecting-the

Single ply roof guarantees usually last 15-20 years, but the real service life can stretch to 25-40 years if the roof’s looked after properly. These guarantees cover materials and workmanship but don’t always account for wear and tear or poor maintenance