Alberta Building Code
Fireplace Liners

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Fire brick liners are located in the fire box.  The fire box is the area where you place wood and light a fire.  Masonry fireplaces are generally lined with fire brick and thin air setting refractory mortar.
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9.22.2.  Fireplace Liners

9.22.2.1.  Brick or Steel Liners

1 )  Except where a fireplace is equipped with a steel liner, every fireplace shall have a firebrick liner.
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9.22.2.2.  Firebrick Liners

1)  Firebrick liners shall be not less than
      a)  50 mm thick for the sides and back, and
      b)  25 mm thick for the floor.
2)  Firebrick liners shall be laid with high temperature cement mortar conforming to CAN/CGSB-10.3, "Air Setting Refractory Mortar."
3)  Joints between a firebrick liner and the adjacent backing masonry shall be offset.
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9.22.2.3.  Steel Liners

1)  Steel liners for fireplaces shall conform to CAN /ULC-S639-M, "Steel Liner Assemblies for Solid-Fuel Burning Masonry Fireplaces,"  
     and shall be installed in accordance with the installation instructions in that standard.
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