(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 one part Portland cement to three 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 one part Portland cement to three parts sand by volume.