1) Except when otherwise specifically stated herein, this
Section applies to masonry fireplaces constructed on-site.
1) Except as otherwise stated in this Section, unit
masonry shall conform to Section 9.20. and concrete to Section 9.3.
2) Masonry above openings shall be supported by steel
lintels conforming to Sentence 9.20.5.2.(2), reinforced concrete or a masonry arch.
1) Footings for masonry and concrete fireplaces shall
conform to Section 9.15.
1) Where a supply of combustion air is provided directly
to the fire chamber of a fireplace, including a factory-built
fireplace, the installation shall comply with the “Outdoor Air
Supply” requirements provided in CAN/CSA-A405-M, “Design and
Construction of Masonry Chimneys and Fireplaces.”
1) Except where a fireplace is equipped with a steel
liner, every fireplace shall have a firebrick liner.
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.
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.
1) Except as provided in Sentence (2), the thickness of the back and sides of a fireplace, including
the thickness of any firebrick liner, shall be not less than 190
mm where a metal liner or a firebrick liner less than 51 mm
thick is used.
2) When a steel fireplace liner is used with an air
circulating chamber surrounding the firebox, the back and sides
of the fireplace shall consist of
a)solid masonry units not less than 90 mm thick, or
b)hollow masonry units not less than 190 mm thick.
1) The distance from the back of the fire chamber to the
plane of the fireplace opening shall be not less than 300 mm.
1) Except as required in Sentence (2), fireplaces shall have a noncombustible hearth extending not less than 400 mm in front of the fireplace opening and not less than 200 mm
beyond each side of the fireplace opening.
2) Where the fire chamber floor is elevated more than 150
mm above the hearth, the dimension of the hearth measured
perpendicular to the plane of the fireplace opening shall be
increased by not less than
a)50 mm for an elevation above 150 mm and not more than 300 mm, and
b)an additional 25 mm for every 50 mm in elevation above 300 mm.
1) Except as permitted in Sentence (2), the fire chamber floor and hearth shall be supported on a
reinforced concrete slab not less than 100 mm thick at its
supports and, if cantilevered, not less than 50 mm thick at its
unsupported edge.
2) A hearth for a fireplace with an opening raised not
less than 200 mm from a combustible floor is permitted to be supported on that floor provided the requirements of Clauses 5.3.6.5. to
5.3.6.7. of CAN/CSA-A405-M, “Design and Construction of Masonry Chimneys
and
Fireplaces,” are followed.
1) The throat of every fireplace shall be equipped with a
metal damper sufficiently large to cover the full area of the
throat opening.
1) The sides of the smoke chamber connecting a fireplace
throat with a flue shall not be sloped at an angle greater than 45° to the
vertical.
1) The thickness of masonry walls surrounding the smoke
chamber shall be not less than 190 mm at the sides, front and
back, except that the portions of the back exposed to the
outside may be 140 mm thick.
1) Factory-built fireplaces and their installation shall
conform to CAN/ULC-S610-M, “Factory-Built Fireplaces.”
1) Combustible material shall not be placed on or near the face of a fireplace within
150 mm of the fireplace opening, except that where the combustible material projects more than 38 mm out from the face of the fireplace
above the opening, such material shall be not less than 300 mm
above the top of the opening.
1) Metal exposed to the interior of a fireplace such as
the damper control mechanism shall have not less than a 50 mm
clearance from any combustible material on the face of the fireplace where such metal penetrates through the face of the fireplace.
1) Not less than a 100 mm clearance shall be provided
between the back and sides of a fireplace and combustible framing, except that a 50 mm clearance is permitted where the fireplace
is located in an exterior wall.
2) Not less than a 50 mm clearance shall be provided
between the back and sides of the smoke chamber of a fireplace
and combustible framing, except that a 25 mm clearance is permitted where the fireplace
is located in an exterior wall.
1) The clearance of combustible material above heat-circulating duct outlets from those outlets shall be not less than
a)300 mm where the combustible material projects not less than 38 mm from the face, and
b)150 mm where the projection is less than 38 mm.
1) Fireplace inserts and hearth-mounted stoves vented through the throat of a fireplace shall conform to ULC-S628, “Fireplace
Inserts.”
1) The installation of fireplace inserts and
hearth-mounted stoves vented through the throat of a fireplace shall conform to CAN/CSA-B365, “Installation
Code for Solid-Fuel-Burning Appliances and
Equipment.”