The binder stiffness of postconsumer asphalt shingles is higher than manufacturer's waste shingles due to oxidation.

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Oxidation aging makes asphalt binder stiffer and more brittle. Post-consumer shingles have weathered in service, exposed to sun, heat, and air for years, so their binder oxidizes and stiffens. Manufacturer’s waste shingles come from production and are relatively fresh, with less aging, so their binder remains softer. This combination means the binder in post-consumer shingles is indeed stiffer than that in manufacturing waste shingles, making the statement true.