The giant inflatable roof above the Minneapolis Metrodome collapsed on Sunday under the weight of a massive snowstorm that swept across the upper Midwest. The weight of more than a foot of snow was too much for the Metrodome roof and it collapsed overnight. The 580,000lbs roof, which is made of Teflon-coated fibreglass, fell in just hours before Minnesota Vikings were due to play the New York Giants. That game had been moved to Monday because of concerns about the snow on the dome roof. The dome collapse came long after the snow had stopped.