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

https://trevorsinspiringnews.yousher.com/what-are-the-realistic-lifespan-ranges-for-tpo-pvc-and-epdm

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