Single ply roofing guarantees, usually 15-20 years, cover manufacturing faults...

https://www.toro-bookmarks.win/single-ply-roof-guarantees-usually-cover-15-20-years-but-the-actual-service-1

Single ply roofing guarantees, usually 15-20 years, cover manufacturing faults but don’t always match the roof’s full service life of 25-40 years. Weather, maintenance, and installation quality all play a part