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

7.5.4.3 — Yoke Vents

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(1) Except as provided in Sentence (4), where a soil or waste stack receives the discharge from fixtures located on more than 11 storeys, a yoke vent shall be,

(a) installed for each section of 5 storeys or part of them counted from the top down,

(b) installed at or immediately above each offset or double offset, and

(2) The yoke vent shall be connected to the soil or waste stack by means of a drainage fitting at or immediately below the lowest soil or waste pipe from the lowest storey of the sections described in Sentence (1).

(3) The yoke vent shall connect to the vent stack at least 1 000 mm above the floor level of the lowest storey in the section described in Sentence (1).

(4) A yoke vent need not be installed provided the soil or waste stack is interconnected with the vent stack in each storey of the section in which fixtures are located by means of a vent pipe equal in size to the branch or fixture drain or 2 in. in size, whichever is smaller.

OBC Definitions

Defined terms on this page

branch

means a soil or waste pipe that is connected at its upstream end to the junction of two or more soil or waste pipes or to a soil or waste stack and that is connected at its downstream end to another branch, a sump, a soil or waste stack or a building drain.

fixture

means a receptacle, plumbing appliance, apparatus or other device that discharges sewage or clear water waste, and includes a floor drain.

fixture drain

means the pipe that connects a trap serving a fixture to another part of a drainage system.

offset

means the piping that connects the ends of two pipes that are parallel.

size

means the nominal diameter by which a pipe, fitting, trap or other similar item is commercially designated.

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.

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.

vent pipe

means a pipe that is part of a venting system.

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 pipe

means a sanitary drainage pipe that carries the discharge from a fixture directly to a waste stack, soil stack, sanitary building drain, branch or sewage system.

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.

yoke vent

means a vent pipe that is connected at its lower end to a soil or waste stack and at its upper end to a vent stack or a branch vent that is connected to a vent stack.

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