Tar and gravel roof systems, also known as built-up roofing gained popularity about a hundred years ago when the many uses of crude oil were finding their way into the economy. As a commercial flat roof system, they've been pretty good and pretty cheap. Fortunately, scientists have developed more sophisticated products that also serve very well on flat and low-slope roofs. A-Plus Roofing Co. highly recommends these systems for their many benefits.

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