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

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

Single ply roof guarantees often cover 15-20 years, but the real service life can stretch 25-40 years if the roof’s properly looked after. Guarantees focus on material defects, not wear and tear or maintenance issues