Div. B › Part 9 › 9.10 › 9.10.4 — Building Size Determination

9.10.4.4 — Rooftop Enclosures

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(1) Rooftop enclosures provided for elevator machinery, stairways or service rooms, used for no purpose other than for service to the building, shall not be considered as a storey in calculating the building height.

OBC Definitions

Defined terms on this page

building height

means the number of storeys contained between the roof and the floor of the first storey.

service room

means a room provided in a building to contain equipment associated with building services.

storey

means , except for the purposes of Part 7 of Division B, the portion of a building, (a)that is situated between the top of any floor and the top of the floor next above it, or (b)that is situated between the top of the floor and the ceiling above the floor, if there is no floor above it.

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

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