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Message: [QUOTE="NJCuse97, post: 3393688, member: 5058"] They did. It was precast That said, concrete is porous and as such it is not great in weather without a sealer. I doubt they used a sealer on the dome interior precast, but perhaps the exterior. Water infiltration can be a huge problem in concrete, especially reinforced concrete (this is why the garage at the MONY buildings collapsed in 1993. My structures professor was a professional/forensic witness). The walls of the Dome are tilted up double "T"s and that is a well known precast shape for bridge roadways and building floor slabs. The Dome used them in a unique way (vertical instead of horizontal) for speed of construction. That is why they cannot take structural loading, they are designed to take force in what would be a lateral direction for the Dome. [/QUOTE]