Did you know asphalt shingles evolved from early roofing materials made from layers of felt and paper, saturated with fish or pine oils, and covered with sand or ground shell?

In a blog post, Heyl & Patterson looks at the evolution of the shingle from these early home coverings to modern architectural designs offering lifetime warranties. Learn also about the essential role that rotary calciners play in processing the materials used to make shingles.

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