Div. B › Part 7 › 7.4 › 7.4.9 — Size of Drainage Pipes

7.4.9.4 — Minimum Size of Building Drains and Sewers

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(1) Every sanitary building drain and every sanitary building sewer shall be at least 4 in. in size.

(2) Every storm building drain and every storm building sewer shall be at least 4 in. in size.

Defined terms on this page

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.

building sewer

means a sanitary building sewer or storm building sewer.

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.

sanitary building sewer

means a pipe that is connected to a sanitary building drain 1 000 mm outside a wall of a building and that conducts sewage to a public sewer or private sewage disposal system.

size

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

storm building drain

means a building drain that conducts storm water and is connected at its upstream end to a leader, sump or catch basin, and at its downstream end to a building sewer or a designated storm water disposal location.

storm building sewer

means a building sewer that conveys storm sewage to a place of disposal and commences 1 000 mm from the building.

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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