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Mansard
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A mansard roof has two slopes, the lower slope is close to vertical at 72 degrees and the top section of the roof is almost horizontal. This style of roof is named after French architect Francois Mansart (1598-1666) who used this design of roof on many of his buildings. A mansard roof has the advantage of maximizing the available space within your loft.

Mansards are commonly built by raising the party/gable walls either side of your house to make the profile for the mansard and then creating the timber frame. Although common on older properties, especially in cities like London, Mansards are not often seen in the suburbs. Flat roof dormers tend to be a more popular choice for the 'average' 3 bed semi or terrace house due to the reduced cost and simpler construction.

The mansard roof became popular in 1960s Neo-eclectic American architecture. Mansard roofs are used on many types of buildings, from homes to apartments to shopping centers.
A mansard loft conversion will almost certainly require planning permission.
Mansard Roof Styles
Straight
The upper slope of a straight Mansard roof is not normally visible at ground level. They are designed with dormer windows set in the lower slope, which may be almost vertical. In addition to extra space, the dormers provide lighting and ventilation. A Mansard straight roof can also have two stories. One drawback of a Mansard roof is that the weight of snow accumulation can cause cracks and leaks from the roof's surface.
Convex
The convex shape of the Mansard roof curves outward on the lower slope. The base of the convex roof is formed by a wide cornice supported by heavy brackets. Some convex mansard roofs are shaped like an "S", while others have a bell shape. This shape, as is the case with all Mansard roofs, adds interior space without the need for adding another story to the building. Convex Mansard roofs are often seen on courthouses with elaborate clock towers.
Concave
The concave Mansard roof curves inward or can be flared. Some concave roofs have a steep angle on the lower slope. During the second half of the 19th century, a popular design for mansions and large buildings was an elaborate concave Mansard roof.
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loft conversion  A mansard in west London
loft conversion  Imagination in smaller spaces
loft conversion  Bathrooms and extra toilets
loft conversion  Climbing the new loft stairs
loft conversion  Dormers & roof-lights
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