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Message: [QUOTE="Ottoble, post: 1040933, member: 2539"] Its the foundations, the current roof adds very little weight to the dome perimeter foundations since inflation carries most of the weight and hard structure roof would easily weigh much much more. In order to achieve those spans I would expect we may need new foundations outside of the existing building footprint. I haven't seen the plans but foundation costs are a big savings with this type of inflated roof I wouldn't expect sufficient overdesign for the change. [/QUOTE]