Mansard roof
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A mansard or mansard roof is a multi-sided gambrel-style hip roof characterised by two slopes on each of its sides, with the lower slope at a steeper angle than the upper, and often punctured by dormer windows. The steep roofline and windows allow for additional floors of habitable space, and reduce the overall height of the roof for a given number of habitable storeys. The upper slope of the roof may not be visible from street level when viewed from close proximity to the building.
A mansard roof on the Château de Dampierre, by Jules Hardouin-Mansart, great-nephew of François Mansart
Mansard rooftops along Boulevard Haussmann in Paris constructed during the Second French Empire.
The Landed Gentry House in Szczecin, Poland
The Hôtel de Besenval in Paris. The mansard roof was added in 1866.
Jules Hardouin-Mansart
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Jules Hardouin-Mansart was a French Baroque architect and builder whose major work included the Place des Victoires (1684–1690); Place Vendôme (1690); the domed chapel of Les Invalides (1690), and the Grand Trianon of the Palace of Versailles. His monumental work was designed to glorify the reign of Louis XIV of France.
Church of the Hôtel des Invalides in Paris (1676–1691)
The outer dome conceals an inner dome, visible from below
Inner dome of Les Invalides, seen from below