Jisho

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Noun
1. flat roof
Wikipedia definition
2. Flat roofA flat roof is a type of covering for a building. In contrast to the more sloped form of roof, a flat roof is horizontal or nearly horizontal. The slope of a roof is properly known as its pitch: Roofs which are nearly flat are known as low-pitch roofs (as the angle of slope increases, so the pitch is said to increase). Any sheet of material used to cover a flat or low-pitched roof is usually known as a membrane and the primary purpose of these membranes is to waterproof the roof area.
Read “Flat roof” on English Wikipedia
Read “陸屋根” on Japanese Wikipedia
Read “Flat roof” on DBpedia

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