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Masonry Chimneys and Flues
Canadian Building Code


9.21.  Masonry & Concrete Chimneys and Flues

9.21.1.  General

9.21.1.1.  Application

1)  This Section applies to:
​
     a)  rectangular masonry or concrete chimneys not more than 12 m in height serving fireplaces or serving appliances having combined total rated heat output of 120 kW or less, and
​
     b)  flue pipes connected  to such chimneys.

2)  Chimneys, other than those described in Sentence (1), gas vents and flue pipes serving gas-, oil- or solid-fuel-burning appliances and their associated equipment, including stoves, ranges and space heaters, covered by the standards referenced in Sentences 9.33.5.2.(1)  and  9.33.5.3.(1), shall conform to Subsection 9.33.10.

3)  Chimneys and flue pipes other than those described in Sentences (1) and (2) shall conform to Section 6.3.
​

9.21.1.2.  Chimney or Flue Pipe Walls

1)  The walls of any chimney or flue pipe shall be constructed so as to be smoke and flame-tight.

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  • Sweeps
    • Creosote
    • Dryer Vent Cleaning
      • Dryer Safety
  • Inspections
    • WETT Inspection
    • Levels of Chimney Inspections
  • Repairs
    • Leak Repairs
    • Chimney Repair
    • Fireplace Repairs
      • Fireplace Smoking Problems
      • Damper Repairs
      • Fireplace Damper Energy Efficiency
  • Installs
    • Wood Stove Installations
    • Fireplace Installation Service
    • Heat Shields
    • Installation Manuals
  • Fireplace Shop
    • Fireplaces
      • Factory Built Fireplaces in Canada
    • Wood Stoves
    • Chimneys
      • Ventis Chimney
      • Pellet Vent
  • Service Locations
    • Cowichan Valley Chimney Services
    • Nanaimo Chimney Services
      • WETT Inspection Nanaimo
    • Vancouver Island Chimney Services
  • Contact
  • Info
    • Chimney Inspection Information Resource
      • Terms of Reference
      • Inspection Service Terms & Conditions
    • Fireplace Dampers
    • Canadian Chimney Flue Liner Information
    • Codes & Standards
      • Building Code
        • Masonry & Concrete Chimneys & Flues
          • Chimney Clearances
      • Masonry Fireplace Chimney Clearance Requirements
      • CSA B-365
      • Solid Fuel Appliance Codes and Standards
      • National Fire Code
      • Emissions & Efficiency
      • Gas Meter Clearances
    • How To - DIY
      • Firewood DIY Guide
      • How To Burn Wood
      • How to Determine Appliance Certification
      • How To Not DIY
    • FAQ
      • Why is my Fireplace Blowing Smoking
      • What is Creosote
    • Fire Safety
      • Carbon Monoxide
      • Unregulated Chimney Industry
      • BBQ Fire Safety
    • Fireplace & Chimney Information Articles
    • Policies
      • Website Terms of Use