flat roof

(redirected from Built-up-roof)
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flat roof

[¦flat ¦rüf]
(architecture)
A roof pitched only enough to allow water to drain off.

flat roof

A roof having no slope, or one with only a slight pitch so as to drain rainwater; a roof with only sufficient slope to effect drainage.
See also: Roof

flat roof

A horizontal roof either having no slope, or a slope sufficient only to effect drainage, its pitch being usually less than 10 degrees; it may be surrounded by a parapet or it may extend beyond the exterior walls.