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What is a chimney chase?

A chimney chase is the cavity between a chimney and the framing or other materials surrounding it. The gap can allow air leakage. Ohio’s Section 1005.8 ties factory-built chimney clearance to manufacturer instructions; identify your chimney system before deciding how to insulate the space around it.

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By InstaBids editorial team with AI research agents. Updated

What this means for your home project

  1. Find the fireplace make and model in your existing documentation; include them with the project request. Source: Chimney Safety Institute of America, read 2026-11-03.
  2. Request a written scope naming the heat-resistant air barrier around the flue shaft, such as sheet metal. Source: Pacific Northwest National Laboratory, read 2026-11-03.
  3. Ask the installer to state the insulation-dam height in the finished-work record; compare it with PNNL’s detail of at least 4 inches above the insulation. Source: Pacific Northwest National Laboratory, read 2026-11-03.
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How do you seal a chimney chase?

Use a heat-resistant air barrier around the flue opening, with the required separation from combustible materials. PNNL distinguishes this work from sealing an ordinary duct chase: “To air-seal around combustion flues, use fire-rated caulk and UL-rated collars or sheet metal cut to fit and sealed with fire-rated caulk, while maintaining proper clearance between flue and combustible materials.” Source: Pacific Northwest National Laboratory, read 2026-11-03. “Air barriers around flue shafts should be made of a heat-resistant material such as sheet metal.” Source: Pacific Northwest National Laboratory, read 2026-11-03.

Should a chimney chase be insulated?

For the attic portion, keep insulation outside a protective dam rather than against the flue pipe. PNNL’s illustrated detail specifies both the separation and the height above the insulation: “The dam should have at least 3 inches of clearance all the way around the flue pipe.” Source: Pacific Northwest National Laboratory, read 2026-11-03. “The dam should be at least 4 inches higher than the finished insulation level.” Source: Pacific Northwest National Laboratory, read 2026-11-03.

What are the first signs a chase is rotting?

Staining can indicate water entry, so it calls for investigation rather than an assumption about the extent of rot. CSIA’s factory-built fireplace guidance identifies this observation: “Make note of any irregularities, such as staining or other indications of water entry.” Source: Chimney Safety Institute of America, read 2026-11-03.

What should a chimney chase proposal say about parts, materials and equipment?

Ask for the chimney system and the installation instructions used to set its clearances. In Ohio, Section 1005.1 and Section 1005.8 connect factory-built chimney installation and clearance to those instructions: In Ohio, “Factory-built chimneys shall be listed and labeled and shall be installed and terminated in accordance with the manufacturer’s installation instructions.” Source: Ohio Administrative Code, read 2026-11-03. In Ohio, “The clearance shall be not less than the clearance to combustibles specified by the chimney manufacturer’s installation instructions.” Source: Ohio Administrative Code, read 2026-11-03.

What drives chimney chase repair cost?

Establish the repair scope first: damaged materials, air sealing and added insulation are separate items to discuss. PNNL’s existing-attic guidance calls for inspection before deciding what work is needed: “Inspect the attic floor around the duct and flue shafts for air and water leaks.” Source: Pacific Northwest National Laboratory, read 2026-11-03. “Repair or replace any damaged materials.” Source: Pacific Northwest National Laboratory, read 2026-11-03. “Add air sealing and/or insulation as needed.” Source: Pacific Northwest National Laboratory, read 2026-11-03.

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