Laundry Hookup: Water, Drain, Vent & Power
Materials list for adding or moving a laundry hookup — supply lines, standpipe, dryer vent, and 220V considerations.
The 4 systems in a laundry hookup
Every laundry rough-in needs four things: hot + cold water supply, drain (standpipe), dryer vent (unless ventless), and electrical (120V for gas dryer, 240V for electric). Missing any one of these turns a weekend project into a week.
Water supply
- Hot and cold PEX or copper lines to the wall box
- Recessed washing machine outlet box with dual shutoffs
- Braided stainless steel washer hoses (never rubber — rated for a fraction of the life)
- Wall-mount hammer arrestors on both lines (prevents pipe knock)
Drain / standpipe
- 2" DWV pipe, PVC or ABS to match the existing system
- Standpipe height: 36"–42" from floor to top of pipe
- P-trap 6"–18" below the standpipe inlet
- Air admittance valve (AAV) if venting through the roof isn't feasible
Dryer vent
- 4" rigid metal vent duct (never plastic flex — fire hazard)
- Foil tape at each joint
- Exterior wall cap with backdraft damper
- Keep total run under 25 ft; deduct 5 ft per 90° elbow
- Gas dryer: check the manufacturer's max vent length carefully
Electrical
- Electric dryer: 240V, 30A dedicated circuit, 10/3 romex, NEMA 14-30 outlet
- Gas dryer: 120V standard outlet + a shutoff valve on the gas line
- Panel/240V work → licensed electrician. Gas line → licensed plumber.
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