Div. B › Part 3 › 3.2 › 3.2.2 — Building Size and Construction Relative to Occupancy

3.2.2.35 — Group A, Division 4

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(1) Except as permitted by Sentences (2) and (3), a building classified as Group A, Division 4 shall be of noncombustible construction.

(2) Roof assemblies and supporting arches and columns are permitted to be of heavy timber construction.

(3) A building classified as Group A, Division 4 is permitted to be of combustible construction provided,

(a) the occupant load is less than 1 500, and

(b) the building has a limiting distance not less than 6 m.

(4) Sprinklers shall be installed in all spaces below tiers of seats in a building classified as Group A, Division 4 if those spaces are used for occupancy.

OBC Definitions

Defined terms on this page

combustible

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

combustible construction

means a type of construction that does not meet the requirements for noncombustible construction or encapsulated mass timber construction.

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.

limiting distance

means the distance from an exposing building face to a property line, to the centre line of a street, lane or public thoroughfare or to an imaginary line between two buildings or fire compartments on the same property, measured at right angles to the exposing building face.

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.

occupancy

means the use or intended use of a building or part of a building for the shelter or support of persons, animals or property.

occupant load

means the number of persons for which a building or part of a building is designed.

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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