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You need to be aware that most jurisdictions allow only two layers of shingles to be applied to the roof due to the load considerations. For example, a 15-square area of roof with two layers of average 250-pound shingle has a total weight of covering of 7,500 pounds, or nearly 4 tons of weight. The under layer for asphalt shingle is usually roofing felt with a course of ice and water shield covering the lowest 3 feet.
The light weight of a corrugated metal panel is another advantage. Compared to asphalt shingles that weigh an average of 2.5 lbs. per square foot, metal roofing panels only weigh .7 to 1.3 pounds per square foot, which allows the panels to be installed over existing roofing materials.n this construction crew, one man delivers the panels to the two installers on the roof. Metal roofing can reflect as much as 70 percent of the sunâs radiant energy. This minimizes heat retention so less heat is transferred into the building. Fasten the panels with a 2â overhang.