What parapet means
A parapet is the low wall that rises above the roof line at the edge of a flat or low slope roof.
Where it matters on a roofing job
Parapets leak at the top through the coping and at the base where the roof membrane turns up the wall. Price the coping cap and the membrane flashing as separate lines, and check the inside face, where water often gets in behind.
What the model code says
- A scupper is an opening in a wall or parapet that lets water drain off the roof. (IRC 2021, Chapter 2)
Check which code edition your building department enforces for parapet before you quote.
What it costs
The flat roof replacement cost guide has the typical job at $9,800 and the usual range at $6,800 to $21,000. 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.