Single ply roof guarantees usually run for 15-20 years, reflecting the...

https://redditchstandard.co.uk/lifestyle/how-long-does-a-single-ply-membrane-roof-really-last-a-building-owners-guide/

Single ply roof guarantees usually run for 15-20 years, reflecting the manufacturer's confidence in materials under ideal conditions. But in reality, these roofs often last 25-40 years if well looked after