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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.
Metal roofs have the best strength to weight ratio of any roofing material, allowing metal roofs to be installed over existing asphalt shingle roofs without the need to add structural support to the roof. Union's steel roofing panels weigh 50% to 65% less per square foot than most asphalt roofing shingles. Installing metal roofing over your existing asphalt shingle roof eliminates landfill waste and saves labor costs for removing the old asphalt roof shingles. Most roof types simply weigh too much to be installed over top of one another without adding additional structural support to the roof.