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Made of laminated sheets 16mm thick, will weigh 1 500 tons and fill an area of 37sq km and cost about R475-million. Engineers hope to finished the roof construction in September. No other stadiums (in the world) are using glass, they use other materials The glass roof will be clear but with a slight "greenish" tinge to it, and cover most of the 68 000 seats. It is expected to last more than 50 years.