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

https://padlet.com/sirachapeteengtx/bookmarks-j04qs0veeiy5e2o1/wish/O7A9QmyNP25lQ6x3

Single ply roof guarantees usually cover 15-20 years, but these membranes often last 25-40 years in real life. The guarantee is about the manufacturer’s promise if something goes wrong, not how long the roof will physically hold up