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Alberta Building Code
Fireplace Hearth

Fireplace & Hearth Service

9.22.5. Hearth

9.22.5.1.  Hearth Extension

1)  Except as required in Sentence (2), fireplaces shall
     have a non-combustible hearth extending not less than
     400 mm in front of the fireplace opening and not
     less than 200 mm beyond each side of the fireplace
     opening.
2)  Where the fire chamber floor is elevated more than
     150 mm above the hearth, the dimensions of the
     hearth measured perpendicular to the plane of the
     fireplace opening shall be increased by not less than
     a)  50 mm for an elevation above 150 mm and not
          more than 300 mm, and
     b)  An additional 25 mm for every 50 mm in
          elevation above 300 mm.
​

9.22.5.2.  Support of Hearth

1)  Except as permitted in Sentence (2), the fire
     chamber floor and hearth shall be supported on a
     reinforced concrete slab not less than 100 mm thick
     at its supports and, if cantilevered, not less than 50
     mm thick at its unsupported edge.

2)  A hearth for a fireplace with an opening raised
     not less than 200 mm from a combustible floor is
     permitted to be supported on that floor provided the
     requirements of Clauses 5.3.6.5 to 5.3.6.7 of CAN/
     CSA-A405, “Design and Construction of Masonry
     Chimneys and Fireplaces” are followed.

​

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(250)800-2251
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​

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  • Sweeps
    • Creosote
    • Dryer Vent Cleaning
      • Dryer Safety
  • Inspections
    • WETT Inspection
      • WETT Levels of Inspection Document
    • Levels of Chimney Inspections
  • Repairs
    • Leak Repairs
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    • Fireplace Repairs
      • Fireplace Smoking Problems
      • Damper Repairs
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  • 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
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