A scupper is an opening through a roof's perimeter wall. Its performance depends on the roof-side connection, the opening through the wall, and the collector or discharge path outside.

What to check first

  • Keep the full opening clear of debris and patch buildup.
  • Inspect corners and flange connections for separation.
  • Check the exterior collector and downspout when investigating a roof-side leak.

Separate a leak from a drainage problem

  1. Trace the water route

    Follow water from the roof surface through the inlet and toward the discharge point. Inspect normal drainage and any separate overflow provision.

  2. Check the waterproof connection

    A sound pipe does not prove the membrane-to-drain connection is sound. Look for loose components, separation, damaged flashing, or patch buildup around the inlet.

  3. Preserve the opening

    A compatible local repair must not reduce the effective outlet or cover its strainer. Persistent ponding, backup, or changes to drain location and size need building-specific professional assessment.

Watch the field examples

These archive demonstrations show individual projects. Use the current guidance above and Bergstrom’s published instructions if an older video shows a different product or method. Torch work shown in installation videos is professional work.

Watch Scupper Drainage Systems: Opening, Flashing, and Discharge · example 1Opens on YouTube ↗Watch Scupper Drainage Systems: Opening, Flashing, and Discharge · example 2Opens on YouTube ↗Watch Scupper Drainage Systems: Opening, Flashing, and Discharge · example 3Opens on YouTube ↗

From the project archive

Scuppers Flat Roof Draining - An incorrectly installed scupper causes pooling water.
Historical project photo · Flat Roof Doctor

Product reference: Bergstrom Industries’ published knowledge catalog. Follow the latest product label and safety information. Historical project examples are educational and are not a specification for every roof.