Div. B › Part 3 › 3.1 › 3.1.5 — Noncombustible Construction

3.1.5.11 — Gypsum Board

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(1) Gypsum board with a tightly adhering paper covering not more than 1 mm thick is permitted in a building required to be of noncombustible construction provided the flame-spread rating of the surface is not more than 25.

OBC Definitions

Defined terms on this page

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.

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.

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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