A roofing system includes an insulation layer and an exposed fiber surface of a sheet. A cement layer is placed intermediate therebetween. An elastomeric outer weatherproof coating overlies the sheet. A process for applying to a roofing system is provided that includes applying to a roofing substrate...http://www.google.es/patents/US20070130864?utm_source=gb-gplus-sharePatente US20070130864 - Roofing system
