Everything about Cornice totally explained
The term
cornice comes from Italian
cornice, meaning “ledge.”
Cornice molding is generally any horizontal decorative molding which crowns any building or furniture element: the cornice over a door or window, for instance, or the cornice around the edge of a pedestal. A simple cornice may be formed just with a
crown molding.
The function of the projecting cornice is to throw rainwater free of the building’s walls. In residential building practice, this function is handled by projecting
gable ends, roof
eaves, and
gutters. The elimination of the cornice has been important enough in
modernist architecture, often simply for demands of style, that elaborate internal drainage systems are provided.
Classical architecture
The cornice molding is the set of projecting
moldings that crown an
entablature along the top edge of a
temple or building. The cornice lies above the
frieze, which rests on the
architrave, all supported by columns.
The sloping cornice, “raking cornice” or “rake board,” is also carried across the top of the triangular
pediment, at the
gable end of a building. , found on the front of such buildings as the
Parthenon, the
Acropolis, or Schinkel’s
Schauspielhaus. The sloping cornice hangs over the end of the structure supporting the roof. In classical and neoclassical architecture, the sloping cornice uses the same molding profile as the cornice below.
Each of the
classic orders has certain characteristic profiles to its cornice:
The geison in classical Greek architecture
Geison (Greek: γεῖσον) is a specialist's
architectural term, denoting the part of the
entablature that projects outward from the top of the frieze in the
Doric order and from the top of the frieze course (or sometimes architrave) of the
Ionic and
Corinthan orders: thus it's simply an equivalent of
cornice. In classical Greek architecture the
geison forms the outer edge of the roof on the sides of a structure with a sloped roof. The upper edge of the exterior often had a drip edge formed as a hawksbeak molding to shed water; there were also typically elaborate moldings or other decorative elements, sometimes painted. Above the
geison ran the
sima. The underside of the geison may be referred to as a
soffit. The form of a
geison (particularly the Hawksbeak molding of the outer edge) is often used as one element of the argument for the chronology of its building.
Horizontal geison
The horizontal
geison runs around the full perimeter of a Greek temple, projecting from the top of the entablature to protect it from the elements and as a decorative feature. Horizontal
geisa may be found in other ancient structures that are built according to one of the architectural orders. The horizontal
sima (with its
antefixes and water-spouts) ran above the horizontal geison along the sides of a building, acting as a rain gutter and final decoration.
Doric order
In the Doric order, the sloped underside of the horizontal
geison is decorated with a series of protruding, rectangular mutules aligned with the
triglyphs and
metopes of the Doric frieze below. Each mutule typically had three rows of six
guttae (decorative conical projections) protruding from its underside. The gaps between the mutules are termed
viae (roads). The effect of this decoration was to thematically link the entire Doric entablature (architrave, frieze, and
geisa) with a repeating pattern of vertically and horizontally aligned architectural elements. Use of the hawksbill molding at the top of the projecting segment is common, as is the undercutting of the lower edge to aid in dispersing rainwater. In order to separate the
geison from the frieze visually, there's typically a bed molding aligned with the face of the triglyphs.
Ionic and Corinthian orders
Horizontal
geisa of these orders relied on moldings rather than the mutules of the Doric order for their decoration.
Raking geison
A raking
geison ran along the top edge of a pediment, on a temple or other structure such as the
aedicula of a
scaenae frons (theater stage building). This element was typically less decorative than the horizontal
geison, and often of a differing profile from the horizontal
geison of the same structure. The difference is particularly marked in the Doric order, where the raking
geison lacks the distinctive
mutules. The raking sima ran over the raking
geison as a decorative finish and, essentially, a rain gutter.
Further Information
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