Single ply roof guarantees usually cover 15-20 years, but these roofs can often...

https://www.blaze-bookmarks.win/single-ply-roof-guarantees-usually-last-15-20-years-but-the-actual-roof-can

Single ply roof guarantees usually cover 15-20 years, but these roofs can often last 25-40 years if well maintained. The guarantee mainly covers material defects, not wear and tear