Div. B › Part 7 › 7.5 › 7.5.4 — Vent Pipes for Soil or Waste Stacks

7.5.4.1 — Stack Vents

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(1) The upper end of every soil or waste stack shall terminate in a stack vent and the stack vent shall terminate in open air outside the building, or connect directly or through a header to another stack vent or vent stack that does terminate in open air outside the building.

OBC Definitions

Defined terms on this page

header

means a vent pipe that connects two or more vent stacks or stack vents to open air.

open air

means the atmosphere outside a building.

soil

means , except for the purposes of Part 8 of Division B, a portion of the earth’s crust that is fragmentary or such that individual particles of a dried sample may be readily separated by agitation in water, and includes boulders, cobbles, gravel, sand, silt, clay and organic matter.

stack vent

means a vent pipe that connects the top of a soil stack or waste stack to a header or open air and “stack vented” has a corresponding meaning.

vent stack

means a vent pipe that is connected at its upper end to a header or is terminated in open air and that is used to limit pressure differential in a soil or waste stack.

waste stack

means a vertical waste pipe that passes through one or more storeys and includes any offset that is part of the stack that conducts liquid waste from fixtures other than sanitary units.

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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