Bonnet roofs, also known as kicked-eaves, are double sloped with the lower slope set at less of an angle than the upper slope. It’s like a reverse Mansard.
The lower slope hangs over the side of the house. This overhang is an excellent cover for an open porch.
Bonnet roofs are not commonly used roofs in modern houses. They were mainly used in French Vernacular and can be seen in regions of Louisiana and Mississippi.
Pros: The upper slope provides extra living space for a small attic or vaulted ceilings. It also lends itself to dormers or side windows.
The overhanging eaves not only provide protection for porches, but also help to protect walls from water damage.
Water easily runs off the slopes of the roof and the modified hip structure make it more durable than a gable roof.
Cons: The complex design requires more building materials and it’s more difficult to construct. This makes the bonnet roof more expensive than other, more simple designs.
Although water easily runs off the slopes, valleys are formed where the two slopes meet. This can cause snow and water to pool. Extra precaution is needed to waterproof these areas.
Suggested Materials: Bonnet roofs can be made from most any type of material, including shingles, metal and natural stone.
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