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A three-story office building is to be built in Pittsburgh, PA. The ground floor will be a concrete slab on grade. The second and third floors should be an economical steel construction consisting of 3000 psi lightweight concrete(115pcf)on a metal deck, supported by steel beams with maximum spacing of10ft. The roof will consist of a covering (discussed below), a metal deck, and steel beams. The metal deck will also serve as lateral bracing. The footings are 4000 psi normal weight concrete. The exterior faade will be masonry block/brick and glass. See attached drawing for further details.

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