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the 169-ton (slightly over 150 tonnes) cantilever roof was made of steel, and there were structural defects found with the cantilevered roof after 16.9 years in service. since there were no rear and side walls and columns to support the structure, the weight of the steel cantilever roof must had caused cracks at welded and or riveted joints of steel beams. i highly doubt each cantilever beam was seamlessly casted as one beam. it was more like jointed shorter i-beams. moreover it was not totally steel as concrete had to be layered over the beams to give the theater its protective cover. since it was open at the rear and sides to the elements, an all-steel roof would be very hot plus the humidity would corrode and rust the steel over time. i remember sitting there sweating and scratching through a show. it wasn’t and couldn’t be air-conditioned unless rear and sides were sealed tight.