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.
branch vent
means a vent pipe that is connected at its lower end to the junction of two or more vent pipes and that, at its upper end, is connected to another branch vent, a stack vent, a vent stack or a header, or terminates in open air.
building drain
means the lowest horizontal piping, including any vertical offset, that conducts sewage, clear water waste or storm water by gravity to a building sewer.
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.
sanitary building drain
means a building drain that conducts sewage to a building sewer from the most upstream soil or waste stack, branch or fixture drain serving a water closet.
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.
soil stack
means a vertical soil pipe that passes through one or more storeys and includes any offset that is part of the stack.
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 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 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