Single ply roof guarantees, typically 15-20 years, cover defects but not the...

https://www.bookmark-friend.win/single-ply-roof-guarantees-typically-cover-15-20-years-focusing-on-material

Single ply roof guarantees, typically 15-20 years, cover defects but not the full life the roof can deliver, which often stretches to 25-40 years with good care