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washer standpipe code

Upstairs Laundry Plumbing & Venting: What the Code Requires

October 6, 2026July 29, 2026 by Tess Carver

Open-framed second-floor laundry alcove showing PEX supply lines with ball valves at 48 inches, a 2-inch ABS standpipe rising from a vented P-trap, and a 1.25-inch vent pipe rising vertically from the drain arm

Upstairs laundry plumbing requirements made plain: 1/2-inch supply lines, a 2-inch standpipe, a vented P-trap, rigid dryer venting, and the DIY-vs-pro line.

Categories Laundry Rooms Tags dryer venting upstairs, laundry room plumbing requirements, washer standpipe code

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