What structural element of a building protrudes from the plane of a sloping roof surface, creating usable space in the roof by adding headroom and usually enabling addition of windows?
Mansard roof Mansard roof A mansard or mansard roof (also called a French roof or curb roof) is a four-sided gambrel-style hip roof characterized by two slopes on each of its sides with the lower slope, punctured by dormer windows, at a steeper angle than the upper. The steep roof with windows creates an additional floor of habitable space (a garret), and reduces the overall height of the roof for a given number of habitable stories. The upper slope of the roof may not be visible from street level when viewed from close proximity to the building. The earliest known example of
Mono-pitched roof a flat ceiling, the mono-pitched part has a sloping or raked ceiling line to maximize the ceiling height. The name lean-to roof comes from this form of addition. Mono-pitched roofs can be used to provide clerestory windows for a hallway or similar room where a row of windows is placed below the edge of the mono-pitched section reaching above the other roof below. Mono-pitched roof A mono-pitched roof, often referred to as a pent roof, shed roof, lean-to roof , and/or skillion roof (in Australia and New Zealand), is a single-sloped roof surface, often not attached to another roof surface.