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Alberta Building Code
Masonry Chimney Clearances


​9.21.5. Clearance From Combustible Construction
9.21.5.1. Clearance from Combustible Materials
1)  The clearance between masonry or concrete chimneys and combustible framing shall be not less than
     a)  50 mm for interior chimneys, and
     b)  12 mm for exterior chimneys. (See Appendix A)
(2)  A clearance of not less than 150 mm shall be provided between a cleanout opening and combustible material.
(3)  Combustible flooring and subflooring shall have not less than a 12 mm clearance from masonry or concrete chimneys.

9.21.5.2 Sealing of Spaces
1)  All spaces between masonry or concrete chimneys and combustible framing shall be sealed top or bottom with non-combustible material.

9.21.5.3. Support of Joists or Beams
Joists or beams may be supported on masonry walls which enclose chimney flues provided the combustible members are separated from the flue by not less than 290 mm of solid masonry.

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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
    • Shawnigan Lake Chimney Services
  • Contact
  • Info
    • Chimney Inspection Information Resource
      • Terms of Reference
    • 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