What technical requirements define epdm roofing vs modified bitumen for asphalt or bitumen modification?

EPDM roofing requires a minimum thickness of 45 mils and is typically installed using adhesives or mechanical fasteners. It is highly resistant to UV radiation and ozone, providing longevity. In contrast, modified bitumen roofing involves asphalt modified with polymers, enhancing flexibility and durability. It is usually installed in layers with heat or cold adhesive methods. Both systems require proper substrate preparation, but EPDM offers superior thermal performance, while modified bitumen excels in adaptability to building movements.