What spark arrestor means
A spark arrestor is the wire mesh screen on a chimney cap that stops burning embers from leaving the flue.
Where it matters on a chimney job
Some fire prone areas require them. The mesh can clog with soot and choke the draft, so check it on every sweep and clean or replace it.
What the model code says
- The spark arrestor must be accessible for cleaning, with a removable screen or cap. (IRC 2021, Chapter 10)
Check which code edition your building department enforces for spark arrestor before you quote.
What it costs
Koira's chimney cap replacement cost guide puts a typical job at $360, with most between $190 to $800. The guide shows its sources and what moves the price.
Work it out
- Cost guide: Chimney cap replacement cost
- Tools, templates and guides: Free chimney resources
Sources: 2021 International Residential Code, Chapter 10, Chimneys and Fireplaces (ICC). Checked October 9, 2026.