Soil stack versus waste stack

Plumbing · Introduction · printed page 285 (PDF page 286)

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Book index entries

Drains – Plumbing – Soil Stack versus Waste Stack Soil Stack versus Waste Stack Waste Stack versus Soil Stack Plumbing

Text in the illustration

toilet
basin
soil stack
vertical drain pipe that carries soil waste from sanitary units (i.e. toilets)
often also referred to as the main stack in houses with only one soil stack
waste stack
any other vertical drain pipe (that doesn't carry soil from a sanitary fixture)

Generated explanation

The illustration compares a soil stack serving a toilet with a waste stack serving a basin. On the left, the toilet outlet passes through the floor and connects by an elbow and horizontal branch to a vertical soil stack. On the right, the basin drains through a P-trap and horizontal branch into a vertical waste stack. The annotations distinguish a soil stack, which carries toilet waste, from a waste stack, which does not carry soil from a sanitary fixture. The soil stack is also identified as commonly called the main stack in houses with only one soil stack.

Components

toilet basin soil stack waste stack horizontal branch drains P-trap drain elbows branch connection fittings