Manufacturer's waste shingles are historically a much larger source of supply for the asphalt industry than postconsumer asphalt shingle waste.

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The main idea is that reclaimed asphalt shingles used in pavement come primarily from postconsumer sources rather than manufacturer waste. Shingle production creates some scrap, but that waste is typically recycled back into the manufacturing process or diverted to other uses, so its volume in the paving stream is relatively small. In contrast, postconsumer shingles from roofs—collected, processed, and recycled—form a large, ongoing supply. As recycling programs and processing capacity grew, more of this postconsumer material found its way into asphalt mixes, often at a lower cost and with environmental benefits. Because of this, postconsumer waste has become the larger source of reclaimed asphalt shingles for the industry, making the statement incorrect. Regional differences can occur, but the general trend supports postconsumer as the bigger supplier.