A single ply roof guarantee usually covers 15-20 years, but the roof itself can...

https://martinqigm171.bearsfanteamshop.com/if-i-only-do-one-thing-this-year-what-roof-maintenance-is-most-important

A single ply roof guarantee usually covers 15-20 years, but the roof itself can last 25-40 years if looked after properly. Guarantees often only cover manufacturing defects, not wear and tear or poor maintenance