A.The differences between organic and fiberglass shingles are considerable and affect the quality rating of each material.

Organic shingles are composed of five components. The mat is made from wood fibers and recycled paper. This mat is saturated with a special saturant-grade asphalt. It is then coated on both sides with a harder, stabilized coating asphalt. A surfacing of mineral granules, usually ceramic-coated crushed rock, is added to protect the asphalt from...

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