Mansard Roof design has been in existence since the 16th Century. It was predominantly French designed homes, but made its way to the US in the late 1800's. It was not used as often in traditional homes, but many high rises residential buildings in the late 60's and 70's were built with them. We now see Mansard roofs most times with a flat or sloped roof at the top. In heavy snow and rain regions of the US, having a sloped or flat roof atop a Mansard is preferred for durability.
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