9.21.3.

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

(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.

(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.

(1) Firebrick liners shall conform to ASTM C27, “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”.

(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”.

(1) Metal liners shall be constructed of at least 0.3 mm thick stainless steel.

(2) Except as permitted in Sentence 9.22.10.2.(3), metal liners referred to in Sentence (1) shall only be used in chimneys serving gas- or oil-burning appliances.

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

(1) A space not less than 10 mm wide shall be left between a chimney liner and the surrounding masonry.

(2) The space required in Sentence (1) shall not be filled with mortar.

(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.

(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.