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Masonry Chimney Construction
Canadian Building Code

Canadian Chimney branded banner displaying fireplace products and chimney services.

9.21.4.​  Masonry and Concrete Chimney Construction

​9.21.4.1. Unit Masonry​

​Unit masonry shall conform to Section 9.20.
​

​9.21.4.2. Concrete​

​Concrete shall conform to Section 9.3.
​

​​9.21.4.3. Footings

​​Footings for masonry chimneys and concrete chimneys shall conform to the requirements in Section 9.15.

​9.15.3.1. Footings

Required Footings shall be provided under walls, pilasters, columns, piers, fireplaces and chimneys that bear on soil or rock, except that footings may be omitted under piers or monolithic concrete walls if the safe load bearing capacity of the soil or rock is not exceeded.

​9.21.4.4. Height of Chimney Flues​

​1)  A chimney flue shall extend not less than

    a)  900 mm above the highest point at which the chimney comes in contact with the roof, and

    b)  600 mm above the highest roof surface or structure within 3 m of the chimney. (See Appendix A.)

​9.21.4.5. Lateral Stability​

1)  Except as provided in Sentence 2), chimneys shall be braced to provide lateral stability for wind loads in accordance with CAN3-S304-M, “Masonry Design for Buildings.”

2)  A chimney need not be laterally braced provided

     a)  No horizontal outside dimension is less than 400 mm, and

     b)  The chimney extends not more than 3.6 m above the roof or the masonry wall of which it forms apart. (See Appendix A.)

​9.21.4.6. Chimney Caps

1)  The top of a chimney shall have a waterproof cap of reinforced concrete, masonry or metal.

2)  The cap required in Sentence (1) shall slope from the lining and be provided with a drip not less than 25 mm from the chimney wall.

3)  Cast in place concrete caps shall be separated from the chimney liner by a bond break and be sealed at that location.

4)  Jointed precast concrete or masonry chimney caps shall have flashing installed beneath the cap extending from the liner to the drip edge.
​
Chimney Cap Repair - Crown Repair Service

​9.21.4.7. Cleanout

1)  A cleanout opening with a metal frame and a tight
     fitting metal door shall be installed near the base of
     the chimney flue.
​

​9.21.4.8. Wall Thickness

1)  The walls of a masonry chimney shall be built of
    solid units not less than 75 mm thick.
​

​9.21.4.9. Separation of Flue Liners

1)  Flue liners in the same chimney shall be separated by
     not less than 75 mm of masonry or concrete exclusive
     of liners where clay liners are used, or 90 mm of
     firebrick where firebrick liners are used.
2)  Flue liners referred to in Sentence (1) shall be
     installed to prevent significant lateral movement.
​

​9.21.4.10. Flashing

​Junctions with adjacent materials shall be adequately
flashed to shed water.
​

​Bracket Chimneys

​For the code requirement prohibiting bracket chimneys, see NBC 9.21.4.3, which refers you to section: 9.15.3.1. Footings Required Footings shall be provided under walls, pilasters, columns, piers, fireplaces and chimneys that bear on soil or rock, except that footings may be omitted under piers or monolithic concrete walls if the safe load bearing capacity of the soil or rock is not exceeded.
​

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  • Sweeps
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