Scupper
An opening in a parapet wall or roof edge that allows water to drain from a flat roof surface into a downspout or directly away from the building.
What Is a Scupper
A scupper is a drainage opening in a parapet wall or roof edge that allows rainwater to exit a flat roof. Scuppers are one of two primary drainage methods for flat roofs, the other being interior roof drains.
Scuppers work with gravity. The roof surface is sloped slightly toward the scupper opening, and water flows through to an external downspout, conductor head, or directly away from the building.
Scupper Maintenance
Scuppers must be kept clear of debris, leaves, and ice. A blocked scupper turns a flat roof into a bathtub, adding thousands of pounds of water weight to the structure. Regular inspection is essential, especially after storms.
Insurance and Scupper Failures
When scupper blockage causes interior water damage, the insurance claim depends on the cause. Storm debris blocking a scupper may be covered, while maintenance neglect typically is not. Documenting the cause of blockage is critical for the claim.
Frequently asked questions
A scupper is a drainage opening cut through a parapet wall or built into the roof edge. Water flows across the roof surface and exits through the scupper into an external downspout or conductor head.
A blocked scupper causes water to pond on the roof surface. Prolonged ponding adds structural load and accelerates membrane deterioration. Most building codes require overflow scuppers or secondary drains as backup.
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