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《屋面工程技术规范》(GB 50207-94)规定:平屋面的排水坡度,采用材料找坡宜为2％;天沟、檐沟纵向坡度不应小于1％;沟底水落差不得超过200mm;水落口周围直径500mm 范围内坡度不应小于5％。《建筑构造通用图集》(88J5)中檐沟找坡层作法为:1:3水泥砂浆找坡5‰,最薄处为20mm 厚。用水泥砂浆找坡,因按规范要求其坡度应≥1％,沟底水落差≤200mm,故不仅造价高,而且荷载大。若用保温材料找坡,虽然荷载较小,但造价更高,且没有必要。
“Roofing Technical Specifications” (GB 50207-94) provides: flat roof drainage slope, the use of materials to find slope should be 2%; gutter, gutter longitudinal slope of not less than 1%; ditch bottom water fall shall not exceed 200mm; The diameter of the water drop around the mouth within 500mm slope should not be less than 5%. The method of looking for slope in the gutter of “General Atlas of Architectural Constructions” (88J5) is that: 1: 3 cement mortar looks for 5 ‰ and the thinnest place is 20mm thick. To find slope with cement mortar, as required by the specification of its slope should be ≥ 1%, ditch bottom water drop ≤ 200mm, it is not only costly, but also large load. Looking for slope with insulation material, although the load is smaller, but the cost is higher, and not necessary.