Roofing Dallas as Compared to Other Cities Roofing varies state to state, not just in installation traditions but in color and styles available.In the Dallas area there are several roofing factories. GAF, Tamko, Atlas, Certainteed, Tamko, all have a presence here with GAF having two factories, one the old Elk plant. If you go to any of the manufacturer sites you’ll see a zip code selector for colors and, of course, contractors. GAF, for example shows a WeatherMax and Marquis but in my 31 years as a contractor and eight years as an installer before that, I’ve never seen them….