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

https://www.bestbookmarks.win/a-single-ply-roof-guarantee-usually-covers-15-20-years-but-the-actual-service

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