Single ply roof guarantees often promise 15-20 years, but the real service life...

https://www.pop-bookmarks.win/single-ply-roof-guarantees-often-cover-15-20-years-but-the-actual-service-life

Single ply roof guarantees often promise 15-20 years, but the real service life can stretch to 25-40 years if the roof’s properly maintained. Guarantees cover faults, not wear and tear or neglect