These heavyweight 30 year architectural asphalt shingles feature a triple-layer fiberglass mat construction with a random cut middle and top saw tooth design. The three layers of mat are coated with asphalt, surfaced with mineral granules, and then laminated together with special asphalt adhesive. A self sealing strip of asphalt helps provide added wind resistance. In order to properly install asphalt, you need a solid deck. We use sturdy 1x6 tongue and groove decking, not plywood. Note: Most gazebo and cabana kits are shipped with asphalt shingles. These shingles are not applied to the roof section, as the section would become too heavy.