Polygomma EPDM roof membrane is a quick, clean, safe and easy to install popular single-ply rubber roofing membrane that offers real value for money. It has a life expectancy in excess of 50 years, even when exposed to the most extremes of temperatures. It’s resistant to the degrading effects of ozone and UV light, it won’t crack, tear or split and is the ideal choice for any flat or low sloping roof. "The perfect roofing materials for your new shed roof!" More.