A four sided roof that has two pitches on each side. The pitch of the lower portion is very steep and is part or all of the exterior finish of the top floor of the building. Windows and doors are either inset or project from this portion of the mansard. The pitch of the upper portion is usually very low or may be flat and usually cannot be seen from the ground. Typical of French renaissance architecture, mansard roofs were practical because they allowed living quarters to be built in the attic.

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