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This term is related to the material that covers most of the exterior walls of the building. If two materials each cover equal areas of walls, choose the heavier material. Where there are multiple materials present on the exterior walls, choose the material that covers more of the walls by area than any other material.
In some cases this will be the same material as "Material of the lateral load resisting system" if the lateral loads are resisted by the exterior walls and if the structural material is exposed. However in many cases the material that covers the exterior walls will be a separate cladding material that does not resist lateral loads and is laid over the lateral load-resisting structure. In both cases, the material of exterior walls should still be defined if it is known, even if it is the same material that forms the lateral load-resisting structure.
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A series of monopitch roofs all sloping in the same direction, giving the impression of a sawtooth in elevation. The vertical walls that separate each roof from each other are typically glazed.
Sawtooth roof, Vancouver, Canada (S. Brzev)
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The shape of the building plan is approximately polygonal, with only minor variations from a polygonal shape. Polygon is a plane figure bounded by a finite number of straight lines (called sides), which connect up and form a closed shape. This term refers to shapes that can be approximated as regular convex polygons (see the drawing below for illustration). Polygon is regular when its side are of equal length. The following polygonal shapes are included in this category: trapezoid (4 sides), pentagon (5 sides), hexagon (6 sides), heptagon (7 sides), octagon (8 sides), etc. Note that square and triangle are also polygons, however they have been identified as separate items in the table.
Any line drawn through a regular convex polygon meets its boundary exactly twice - the example shows a pentagonal shape (adapted from Salix Alba for English Wikipedia)
A building with trapezoidal plan, Shiraikan Building, Kyoto University, Japan (left: Map data ©2013 Google, ZENRIN; right: C. Scawthorn)
A reinforced concrete high-rise building in Chile with hexagonal plan shape (O. Moroni, C. Gomez, and M. Astroza, Chile, World Housing Encyclopedia Report 6)
The Octagon House in San Francisco, California has octagonal plan shape (Map data ©2013 Google, DigitalGlobe, U.S. Geological Survey, USDA)
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Cast-in-place concrete joists with hollow clay tiles and cast-in-place reinforced concrete topping, sometimes overlaid with flooring. These floors may or may not have reinforced concrete ring beams at the perimeter.
Hollow clay tiles with cast-in-place concrete joists and topping, Slovenia (M. Lutman and M. Tomazevic, World Housing Encyclopedia Report 73)
Prefabricated reinforced hollow clay tile beams, with reinforced concrete ring beams, Italy (Maffei et al., EERI, 2006)
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The total number of storeys of a building, both above and below ground-level