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Alberta Building Code
Chimney Lining

9.21.3.  Chimney Lining

9.21.3.1.  Lining Materials

1)  Every masonry or concrete chimney shall have a lining of clay, concrete, firebrick or metal.
​

9.21.3.2.  Joints in Chimney Liners

1)  Joints of chimney liners shall be sealed to provide a barrier to the passage of flue gases and condensate into the cavity between the
     liner and the surrounding masonry.
2)  Joints of clay, concrete or firebrick chimney liners shall be struck flush to provide a straight, smooth, aligned chimney flue.
​

9.21.3.3.  Clay Liners

1)  Clay liners shall conform to CAN/CSA-A324-M, "Clay Flue Liners."
2)  Liners referred to in Sentence (1) shall be not less than 15.9 mm thick and shall be capable of resisting, without softening or
     cracking, a temperature of 1100°C.
​

9.21.3.4.  Firebrick Liners

1)  Firebrick liners shall conform to ASTM C 27, "Classification of Fireclay and High-Alumina  Refractory Brick."
2)  Firebrick liners shall be laid with high temperature cement mortar conforming to CAN/CGSB-10.3, "Air Setting Refractory Mortar."
​

9.21.3.5.  Concrete Liners

1)  Concrete flue liners shall conform to Clause 4.2.6.4. of CAN /CSA-A405-M, "Design and Construction of Masonry Chimneys and  
     Fireplaces."
​

9.21.3.6.  Metal Liners

1)  Metal liners shall be constructed of not less than 0.3 mm thick stainless steel.
2)  Metal liners referred to in Sentence (1) shall only be used in chimneys serving gas- or oil-burning appliances. (See Appendix A.)
​

9.21.3.7.  Installation of Chimney Liners

1)  Chimney liners shall be installed when the surrounding masonry or concrete is placed.
​

9.21.3.8.  Spaces Between Liners and Surrounding Masonry

1)  A space not less than 10 mm wide shall be left between a chimney liner and surrounding masonry.
2)  The space required in Sentence (1) shall not be filled with mortar.
​

9.21.3.9.  Mortar for Chimney Liners

1)  Chimney liners used in chimneys for solid-fuel-burning appliances shall be laid in a full bed of
     a)  high temperature cement mortar conforming to CAN/CGSB-10.3, "Air Setting Refractory Mortar," or
     b)  mortar consisting of 1 part Portland cement to 3 parts sand by volume.
2)  Chimney liners used in chimneys for oil- or gas-burning appliances shall be laid in a full bed of mortar consisting of 1 part Portland
     cement to 3 parts sand by volume.
​

9.21.3.10.  Extension of Chimney Liners

1)  Chimney liners shall extend from a point not less than 200 mm below the lowest flue pipe connection to a point not less than 50 mm
     or more than 100 mm above the chimney cap.

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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 Smoking Problems
      • Damper Repairs
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  • Installs
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      • Factory Built Fireplaces in Canada
    • Wood Stoves
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  • Service Locations
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  • Contact
  • Info
    • Chimney Inspection Information Resource
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    • Fireplace Dampers
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    • Codes & Standards
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      • CSA B-365
      • Solid Fuel Appliance Codes and Standards
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    • How To - DIY
      • Firewood DIY Guide
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    • FAQ
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