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

https://caidenaope074.trexgame.net/single-ply-vs-epdm-which-one-lasts-longer-on-a-warehouse

Single ply roof guarantees usually cover 15-20 years, but these membranes can last 25-40 years with proper care. The guarantee mainly covers materials, not wear and tear or maintenance issues