Single ply roof guarantees of 15-20 years cover material and workmanship, but...

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

Single ply roof guarantees of 15-20 years cover material and workmanship, but the actual service life can be 25-40 years with proper care. Factors like weather, maintenance, and installation quality all play a role