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

https://www.bookmarkmaster.win/single-ply-roof-guarantees-usually-cover-15-20-years-focusing-on-materials-and

Single ply roof guarantees usually cover 15-20 years, but the actual service life can stretch to 25-40 years with the right care. The difference comes down to day-to-day wear, weather, and maintenance