definition
strict definition
flat roof
A roof with no slope greater than 10 degrees or major projecting features, allowing small parapets, vents, skylights, and chimneys.
A flat roof is a roof without any slope greater than 10 degrees, and without any ornamentation, mechanical penthouses, or other architectural features rising above it. A small cornice or parapet around the edge, small vents or skylights, or chimneys do not interfere with a roof's qualification as flat.
If a building has a mechanical floor at the top, which is set back from the perimeter of the floors below, and the roof below that is flat, then it is classified as a flat roof with box(es).
A gabled, hipped, pyramidal, or sloping roof with an extremely shallow slope (10 degrees or less) is considered a flat roof.
flat roof Photos
Related definitions
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angled mansard
A flat central roof bounded by slopes that bend downward to become steeper toward the edges. -
bowed roof
A roof formed by arches, vaults, or other convex surfaces curved in one direction, excluding domes. -
cross-ridged roof
A roof with at least two ridges forming an intersection or fork, including T-shaped intersections. -
curved mansard
A flat central roof bounded by convex curved slopes that generally grow steeper toward the edges. -
dome
A roof curved more or less evenly on all sides with a circular or oval curve, rising to an approximate peak. -
flat roof with box(es)
A roof without any major slope, and with at least one box-like penthouse structure. -
gabled roof
A roof which slopes evenly in two directions from a central ridgeline, forming two flat gabled sides at opposite ends. -
hipped roof
A roof with four or more uneven sides which slope up to a connecting ridgeline. -
irregular roof
An uncommon roof form that does not approximate another defined type, beyond small deviations from those types. -
no roof
A partly enclosed built object whose interior has no roof or roof-like shelter, excluding objects with retractable roofs. -
open framework
An open framework of several beams large enough to dominate the entire roof of a building. -
parallel-ridged roof
A roof folded into multiple ridges that neither intersect nor form one continuous straight or bent line. -
pyramid
A roof with three or four sloping sides meeting at a single point, sometimes classified as a spire when very tall and narrow. -
roof with towers
A complex roof dominated by one or more prominent towers, turrets, or other projecting peaks. -
sloped roof
A roof dominated by a straight slope in one direction, at least 10 degrees from horizontal. -
tapered roof
A pointed, cone-like roof with more than four sides or a curved plan, possibly carrying a small ornament at its peak. -
terraced roof
A building top whose roof is distributed over successive large steps or terraces on one or more sides. -
ziggurat
A square or rectangular roof with at least two closely spaced, nearly centered setbacks forming a stepped pyramid.