Venting an island sink (below-floor trap permitted)

Plumbing · Floor Drains · printed page 290 (PDF page 291)

Book index entries

Island Sink – Venting (Below-Floor Trap Permitted)Venting – Plumbing – an Island Sink – Below-Floor Trap Permitted Plumbing

Text in the illustration

wall
vent
island sink
if local codes permit long (i.e. 36") tail pieces, an island sink can be vented relatively easily by installing the trap below floor level
cleanout
floor framing
trap accessible from below
drain

Generated explanation

The illustration shows an island sink with a long vertical tailpiece extending through the floor to a trap accessible from below. The trap outlet connects to a horizontal drain beneath the floor. A vent branch rises from the drain downstream of the trap, runs horizontally at the floor framing, and turns upward inside an adjacent wall. A cleanout is shown near the base of the vertical wall vent. The annotation identifies this arrangement as an option where local codes permit long tailpieces, such as 36 inches, and a below-floor trap.

Components

island sink faucet sink cabinet sink tailpiece below-floor trap horizontal drain vent branch vertical vent cleanout floor framing wall

Materials

wood framing

Related illustrations

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