National Roofing Contractors Association - www.nrca.net

Asphalt Roofing Manufacturers Association - www.asphaltroofing.org

Roof Consultants Institute - www.rci-online.org

Cedar Shake & Shingle Bureau - www.cedarbureau.org

Metal Building Manufacturing Association - www.mbma.com

Tile Roofing Institute - www.tileroofing.org

Roof Help - www.roofhelp.com