Single ply roof guarantees often cover 15-20 years, but the actual service life...

https://sirachapete736.gumroad.com/p/what-would-stop-a-single-ply-roof-reaching-35-years

Single ply roof guarantees often cover 15-20 years, but the actual service life can stretch to 25-40 years with proper care. These warranties focus on materials, not wear and tear or maintenance