Overflow roof scuppers will let the water run freely down the side of the building.Ī roof scupper is usually part of a peripheral drainage system, which is a drainage system in which the water drains off the sides of the roof, instead of through the roof itself using drains (an internal drainage system). Primary roof scuppers normally channel water off the roof into a conductor box that connects to a downspout or a gutter. Scuppers provide a pathway for water to flow through parapet walls or any other raised edge around a roof, such as gravel stop edge metal. Roof scuppers with spouts that project out beyond the wall are known as “roof canales” in the American Southwest, where they are often used for rainwater collection. Roof scuppers are occasionally referred to as “scupper drains”, for obvious reasons. The International Building Code defines a roof scupper as “an opening in a wall or parapet that allows water to drain from a roof”.
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