flat roof

No-slope house top

A flat roof is a roof with little or no pitch, appearing level or nearly so.

Common on commercial buildings and modern residential architecture, flat roofs require different drainage and waterproofing than sloped roofs: The flat roof leaked after heavy rain.

Despite the name, most have a slight slope to prevent water pooling.

Opposites
roof slope/pitch

flat roofpitched roof

Angled building top

sloped roof · steep roof · gabled roof · peaked roof · A-frame roof

Family

flat, roof, flatten, flatter, flats, flattened, flattening

Familiarity
Top 50,000
Profile
Known to kids · Used worldwide · Timeless · Concrete · Everyday, not technical · Rated G