EPDM has been used on large commercial and industrial roofs since the mid 1960s giving it a proven life of over 45 years with a life expectancy of 50 years+. This technology is now available for domestic properties. Conventional flat roofs have a limited life and are prone to leaking giving flat roofs a very bad reputation. 1. Using modern insulation materials we can install the equivalent of 450 mmsof fiberglass insulation into your flat roof without changing the external appearance of your roof.