During a reroof, old asphalt shingles are removed, and new underlayment and shingles are installed. But what happens to the old shingles? Traditionally, they end up in a landfill, but shingle ...

ach year, some 12 million tons of asphalt shingles, which represent the primary type of roofing in the United States, end up in landfills. Standard Industries’ GAF, whose roofs are on roughly one in ...