The manufacturers all agree! Modified asphalt shingles will outlast and outperform oxidized asphalt shingles. Don’t waste your money on a asphalt type known for failing in Midwest weather buy a product that will last. Why modified asphalt? because the asphalt is what waterproofs your shingle as well as binds the fiberglass mat and granules together. Oxidized asphalt is a dinosaur from the past with a final product that dries and becomes brittle. The future is in Modified asphalts providing a rubberized characteristic that provides a class 3 and 4 impact resistance. Check with your homeowners insurance about a reduction for using a class 4 impact shingle. Modified asphalts provide a stronger bond with the granules providing long term retention and brilliance to your roof.