![]() ![]() The roof-side flange of the gravel stop is nailed at 3" O.C. Where a roof is completely surrounded by parapet walls and drainage is provided by scuppers or internal drains, overflow scuppers should be provided. Special Conditions: In areas with severe ice and snow conditions and/or excessive debris, conductor heads with overflow openings should be used. Scuppers should be spaced no greater than 10 feet apart depending on the roof area drained. Wood blocking is required under scuppers to provide a nailable surface. Scuppers are fabricated with flanges on the roof side which extend 4" onto the roof. The minimum recommended weight for the construction of scuppers is 16 oz. When neither conductor heads nor gutters are used to catch the water, scupper spouts should extend past the exterior surface of the building to avoid wetting the building surface. When a conductor head is used, it should be at least 2" wider than the scupper. Scuppers can be installed to carry water into gutters or directly into downspouts through conductor heads. They can be used in conjunction with gutters and downspouts to divert the flow to the desired location. Description: Scuppers are used to provide an outlet through parapet walls or gravel stops on flat and built-up roofs to allow drainage of excess water.
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