Roof shapes differ greatly from region to region.
M shaped roof plan.
The pitch is generally lower than an m shaped roof because the butterfly has to cover sometimes the entire area of a floor plan.
Drainage does exist as seen in the picture but debris and snow can collect there without much trouble.
The obvious advantage is there is double the space.
The design borrows some from the concept of the shed roof avoiding a slope on the backside to allow more natural light and functional space into the interior.
The main factors which influence the shape of roofs are the climate and the materials available for roof structure and the outer covering.
Usages vary slightly from region to region or from one builder or architect to another.
Roof styles vegetable garden shed outdoor structures veg garden lean to shed vegetable gardening coops vegetables garden.
Roof terminology is also not rigidly defined.
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Example of an m shaped roof.
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While m shaped frames are slightly better with the wind factor the valley of the m is seen as a drawback.
It also features a central gutter at a right angle to the front facade.
When the floor plan calls for a t shaped house the roof is called cross gabled if one of the sloping sides ends in a wall that s shorter than the wall on the other side it s a saltbox there are also terms to distinguish gabled roofs that show their slanting side on the front side gabled from those where the pointed wall is prominent.