Regular (3-tab) asphalt shingles have three regularly spaced asphalt tabs, giving the roofing material a very repetitive pattern. In contrast, dimensional shingles have two layers of shingle material bonded together, giving them a three dimensional appearance.
While giving a beautiful rustic look, roof shakes are usually a less popular options because of their traditional cedar or wood construction. Today, shakes are a style easily replicated with more durable and long lasting materials like fiberglass.
General Description. Metal roofing is mostly steel or aluminum, although copper and other metals are sometimes used. Steelis invariably galvanized by the application of a zinc or zinc/aluminum coating, which greatly reduces the rate of corrosion.