Built-up roofing is layers of asphalt and felt, often topped with gravel. Plenty of older Scottsdale and Phoenix buildings still have it. Heat dries the asphalt until it cracks, and gravel hides the splits. We find and repair leaks in built-up roofs. When one is worn out, the city's re-roofing guide generally calls for removing it before the new roof goes on.
Built-Up Roofing is one of the oldest roofing methods still currently in use throughout the world. for many years, built-up roofs have been protecting the interiors and maintaining the integrity of low-slope rooftop buildings. Why? Because the concept is undeniably sound, and while modernization in terms of materials has occurred, the steps for successful installation are very much as they’ve been for a century and more. Built-Up roofing systems consist of layers of material such as felt, mat, or fabric that are saturated with bitumen, coal tar pitch, or asphalt. This building up of waterproofing gives these systems the weatherproofing and temperature resistance important to all roofing, but with the advantage of being less expensive.