Saddle roof

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Hyperbolic paraboloid geometry as used in saddle roof construction.
Hyperbolic paraboloid geometry as used in saddle roof construction.

A saddle roof is one which follows a convex curve about one axis and a concave curve about the other. The hyperbolic paraboloid form has been used for roofs at various times since it is easily constructed from straight sections of lumber, steel, or other conventional materials.[1] The term is used because the form resembles the shape of a saddle.

Mathematically, a saddle shape contains at least one saddle point.

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  1. ^ A Dictionary of Architecture, Fleming, Honour, Pevsner