What scupper means
A scupper is an opening through a parapet wall that lets water run off a flat roof, usually into a collector box and downspout.
Where it matters on a roofing job
Clogged or undersized scuppers let water pond on flat roofs, which shortens the membrane's life. When a flat roof leaks after heavy rain, check that the scupper is clear and that the membrane is properly flashed into it.
What the model code says
- The code defines a scupper as an opening in a wall or parapet that allows water to drain from a roof. (IRC 2021, Chapter 2)
Check which code edition your building department enforces for scupper before you quote.
What it costs
For scupper, the closest koira.ai price is the flat roof replacement cost guide, near $9,800 for a typical job and $6,800 to $21,000 for most. The guide shows its sources and what moves the price.
Work it out
- Cost guide: Flat roof replacement cost
- Licensing: Roofing license rules by state
- Tools, templates and guides: Free roofing resources
Sources: 2021 International Residential Code, Chapter 2, Definitions (ICC). Checked October 9, 2026.