Asphalt Shingles are made with a fiberglass base, layers of specially formulated asphalt and specifically cut and shaped granules, allowing the typical modern shingle to last for approximately 25 years in a well ventilated roof system (although some asphalt shingles can last for up to 40 years). Shingle roofs are the most common type of residential roof in the GTA and although less complicated and quicker to install than other roofing systems, caution still needs to be exercised when choosing an installer. At Coverall Roofing our Shinglers have years of experience in both Canada and the USA and have encountered and solved a multitude of complex roofing issues.