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Concrete shell
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==Disadvantages== Since concrete is a porous material, concrete domes often have issues with sealing. If not treated, rainwater can seep through the roof and leak into the interior of the building. On the other hand, the seamless construction of concrete domes prevents air from escaping, and can lead to buildup of condensation on the inside of the shell. Shingling or sealants are common solutions to the problem of exterior moisture, and [[dehumidifier]]s or ventilation can address condensation. [[File:Rome (Italy, October 2019) - 275 (50589571796).jpg|thumb|The dome of the [[Pantheon, Rome]], the oldest known concrete shell]]
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