| certainteed.com | Saint-gobain Vetrotex: Glass Fiber Reinforcements For Composites |
| atas.com | Atas International, Inc. |
| lgsea.com | Light Gauge Steel Engineers Association Frame Index |
| steelroofing.com | Galvalume Steel Roofing |
| steelframingalliance.com | The North American Steel Framing Alliance |
| steel.org | American Iron and Steel Institute |
| nrca.net | NRCA, The National Roofing Contractors Association |
| metalworksroof.com | Metal Roofing - Steel Shingles |
| metalconstruction.org | Metal Construction Association - Mca | Home |
| mbma.com | Metal Building Manufacturers Association |
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