| 9.21.3. |
Chimney Lining |
| 9.21.3.1. |
Lining Materials
- Every masonry or concrete chimney shall have a lining of clay, concrete, firebrick or metal.
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| 9.21.3.2. |
Joints in Chimney Liners
- 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.
- Joints of clay, concrete or firebrick chimney liners shall be struck flush to provide a straight, smooth, aligned chimney flue.
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| 9.21.3.3. |
Clay Liners
- Clay liners shall conform to CAN/CSA-A324-M, "Clay Flue Liners."
- 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 1 100°C.
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| 9.21.3.4. |
Firebrick Liners
- Firebrick liners shall conform to ASTM C 27, "Fireclay and High-Alumina Refractory Brick."
- Firebrick liners shall be laid with high temperature cement mortar conforming to CAN/CGSB-10.3, "Air Setting Refractory Mortar."
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| 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."
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| 9.21.3.6. |
Metal Liners
- Metal liners shall be constructed of not less than 0.3 mm thick stainless steel.
- Metal liners referred to in Sentence (1) shall only be used in chimneys serving gas- or oil-burning appliances. (See Note A-9.21.3.6.(2).)
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| 9.21.3.7. |
Installation of Chimney Liners
- Chimney liners shall be installed when the surrounding masonry or concrete is placed.
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| 9.21.3.8. |
Spaces between Liners and Surrounding Masonry
- A space not less than 10 mm wide shall be left between a chimney liner and surrounding masonry.
- The space required in Sentence (1) shall not be filled with mortar.
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| 9.21.3.9. |
Mortar for Chimney Liners
- Chimney liners used in chimneys for solid-fuel-burning appliances shall be laid in a full bed of
- high temperature cement mortar conforming to CAN/CGSB-10.3, "Air Setting Refractory Mortar," or
- mortar consisting of 1 part Portland cement to 3 parts sand by volume.
- 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.
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| 9.21.3.10. |
Extension of Chimney Liners
- 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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