Mansard Roof Construction Details

It is similar to a gambrel roof but differs in that it displays the same profile on all sides whereas a gambrel roof has vertical gables at either end.

Mansard roof construction details.

There is a sort of visible distinction between flat roofs and mansard roofs. Mansard is a four sided roof with double slopes on each side so its sides can either be curved or flat. The lower ends of the pans are typically hooked over an edge strip to form a drip. You can consider gambrel roof to be a modified version of a gable roof.

Mansard roofs are for the most part based on standing seam or batten seam construction. The mansard is particularly well suited to renovation work on pitched roof houses because the upper story can be enlarged without adding extra height to the structure. The low downward slope of the mansard roof line acts visually to reduce the scale of a building and helps to eliminate a boxy appearance. But you cannot misunderstand them as straight panel roofs.

If you are not familiar with a gambrel roof then let us first explain its architecture in brief. Mansard roof with mansard tiles ensure that a clear ventilation path is maintained from eaves to ridge where insulation is positioned between the rafters. Establish the correct number of courses of mansard tiles to maintain minimum headlap of 65mm. A mansard roof also known as a french or curb roof is a roof characterised by that fact that each of its four sides has two pitches the lower pitches being steeper than the upper pitches.

Lap the roof underlay over the mansard underlay by minmum 150mm.