Div. B › Part 3 › 3.1 › 3.1.13 — Interior Finish

3.1.13.8 — Noncombustible Construction

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(1) In a building required to be of noncombustible construction,

(a) the flame-spread ratings required by Subsection 3.1.5. shall apply in addition to the requirements in this Subsection, and

(b) the flame-spread ratings for exits in this Subsection shall also apply to any surface in the exit that would be exposed by cutting through the material in any direction, except that this requirement does not apply to doors, heavy timber construction in a sprinklered building and fire-retardant treated wood.

OBC Definitions

Defined terms on this page

exit

means that part of a means of egress, including doorways, that leads from the floor area it serves to a separate building, an open public thoroughfare or an exterior open space protected from fire exposure from the building and having access to an open public thoroughfare.

fire-retardant treated wood

means wood or a wood product that has been impregnated with fire-retardant chemicals to reduce its surface-burning characteristics such as flame spread, rate of fuel contribution and the density of smoke developed.

flame-spread rating

means an index or classification indicating the extent of the spread of flame on the surface of a material or an assembly of materials, as determined in a standard fire test prescribed in this Code.

heavy timber construction

means that type of combustible construction in which a degree of fire safety is attained, (a)by placing limitations on the sizes of wood structural members and on the thickness and composition of wood floors and roofs, and (b)by the avoidance of concealed spaces under floors and roofs.

noncombustible

means that a material meets the acceptance criteria of CAN/ULC-S114, “Test for Determination of Non-Combustibility in Building Materials”.

noncombustible construction

means a type of construction in which a degree of fire safety is attained by the use of noncombustible materials for structural members and other building assemblies.

sprinklered

means equipped with a system of automatic sprinklers.

building

(a) a structure occupying an area greater than ten square metres consisting of a wall, roof and floor or any of them or a structural system serving the function thereof including all plumbing, works, fixtures and service systems appurtenant thereto,
(b) a structure occupying an area of ten square metres or less that contains plumbing, including the plumbing appurtenant thereto,
(c) plumbing not located in a structure,
(c.1) a sewage system, or
(d) structures designated in the building code; Act

construct

to do anything in the erection, installation, extension or material alteration or repair of a building and includes the installation of a building unit fabricated or moved from elsewhere; Act

construction

has a corresponding meaning to “construct”; Act

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