A laundry standpipe connects a washing machine’s drain hose to a home’s waste stack. While it might be tempting to simply connect your washer to any other convenient drain line, doing so increases the risk of water overflow and sewer fumes.
To properly drain your washing machine, you’ll need to have three components:
- Standpipe. Standpipes should be at least 2” in diameter and large enough to accept the washing machine’s drain hose. (At one time, Residential Code allowed for 1 ½” standpipes, but that size is no longer sufficient for newer washing machines.). Laundry standpipes must be tall enough to extend past the washing machine’s overflow line—typically 30-36” in height, or 18”-30” above the trap.
- P-trap. P-traps prevent hazardous and potentially flammable sewer gases from entering your home. Any fixture connected to a waste line must have a P-trap. The trap should be 6-18” from the floor. It is critical to maintain the correct pitch in the horizontal pipe connecting the trap to the waste stack.
- Vent. Pipes that aren’t vented are at great risk of overflowing and releasing harmful gases. In the case of laundry standpipes, the vent should be at least 1 ½” in diameter and located within 5 feet of the trap.
Maplewood Plumbing and Sewer has been repairing, replacing, and installing laundry room standpipes in St. Louis homes for more than 30 years. Contact us today at 314-645-6350 or here for more information or to request a bid.
We offer a one-year warranty on all parts and labor excluding washers.
We are also experts in Kitchen plumbing, basement plumbing, bathroom plumbing and tankless water heater installation. Give us a call at 314-645-6350 or fill out the contact form here to request a bid.