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Yes, but only with a reroof. A roof like this can have a maximum of 600 pounds per 100 square feet and each layer of shingles is approx. 220 pounds. Three layers of shingles on the roof are overweight. Part of the plan set that we submit for the solar permit is the structural plan set that the city uses to make sure that the roof can support the weight of solar on the roof. Solar weighs less than a layer of roofing so usually it is okay. However when the roof on it's own is overweight before we add solar we have no choice but to re-roof to bring the weight down otherwise the permit would never be approved and we would never pass inspection by the city.