Roof Drainage Scupper

In short a scupper is a detail that provides drainage to a roof system by allowing the water runoff from the roof to exit the roof through a metal edge parapet wall or through the deck into a downspout or leader not run through the interior of the building.

Roof drainage scupper.

Scuppers are commonly used on flat roofs that have a parapet or other type of perimeter barrier enclosing the roof. Flat roofs that are designed to have scuppers as a drainage system are almost maintenance free. Drains scupper roof drains side outlet drains sheet metal. 3 where the height of the parapet is more than 150 mm or exceeds the height of the adjacent wall flashing a emergency roof overflows or scuppers described in clause 2 c shall be provided and b there shall be a minimum of two roof drains.

The full flow capacity of a drain is not realized until the water reaches approximately 2 5 inches above the inlet in a four inch drain and 3 5 inches in a six inch drain. Scuppers will play one of two roles in a roof system. Scupper drain 3 1 2 inch od round x 12 long drain with 4 inch outer face and front lip. 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.

The roof is sloped toward the scuppers and water simply drains out through the scuppers. Scuppers are open holes or channels cut into the roof edge or parapet. Round x 12 in. E there is at least one drain for each 900 m 2.

The national roofing contractors association defines scupper as a drainage device in the form of an outlet through a wall parapet wall or raised roof edge typically lined with a sheet metal sleeve it is more often seen in apartments and other commercial buildings though is sometimes found in residential homes constructed with flat roofs. Debris and small objects will not get stuck. An overflow drainage system will be designed to function independently of the primary system to drain water from the roof. Open end scuppers allow for debris to be washed off the roof unlike a drain or gutter that gets full of debris.

The factors which affect proper roof drainage are deck slope drain flashing size and placement of drains. Flat roof drainage system specifications designs troubleshooting problems solutions for interior drains on flat building roofs flat roof drains scuppers and screens questions answers about keeping the flat roof drainage system working or about installing new drains in a flat roof. 26 gauge galvanized soldered face connection. They can be used in conjunction with gutters and downspouts to divert the flow to the desired location.

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