How to Install a Washing Machine Standpipe Drain

Many people make the mistake of draining the water from their washing machine through a utility sink. However, experts propose that the best way to ensure the proper draining of the washing machine is through the installation of a standpipe. This is a vertical pipe connected to a P-trap, which then connects to a drain. A sturdy 2-inch pipe will work well as a standpipe.

Provide Ventilation

The standard washing machine expels enough water into your drainage system to empty other P-Traps in nearby toilets and sinks due to a lack of air in the system. To avoid this from happening, ensure to provide ventilation on the line.

In this guide, we look at a practical, systematic process to install a standpipe for your washing machine.

Tool for the Job

With the following tools, installing a standpipe for your washing machine will be a breeze.

• Solvent glue
• Reciprocating saw
• 2-inch standpipe
• Utility knife
• Primer

How to Install a Washing Standpipe

This is an easy do-it-yourself installation process, and you can complete the job in a few hours.
• Find a drainpipe near the location of the washing machine and use the reciprocating saw to cut through the drainpipe. Use the utility knife or 120-grit sandpaper to smooth out any rough edges.
• Fix a wye fitting that has a 2-inch inlet to the section of the pipe you have cut using ABS cement.
• Insert the 2-inch pipe to the wye fitting to its fit into the wye and then clean the pipe using the primer. After this, apply the solvent glue to the new joints you have made.
Ensure that the pipe extends from the wye fitting connection with a maximum height of 12-inches off from the wye fitting. Maintain a gradient of ¼ inches per foot to allow for proper drainage.
• Use the solvent glue to attach a 2-inch P-trap at the other end of the standpipe. The best p-trap is one that has a clean out plug, which makes it easy to remove any obstructions that may collect in the p-trap.
• Insert the glued standpipe to the p-trap that should be long enough to extend to a level above the washing machine. Use pipe strapping to secure it in place.
• Add a vent approximately 5 feet from the position of the p-trap and attach a sanitary tee to the vent. The inlet of the sanitary tee ought to face upwards, and the sweeping point should face towards the washing machine. Connect the new vent to an existing vent using a sanitary tee and ensure a ¼-inch minimum upward slope to the existing vent.

In conclusion, allow the glue on the new joints to dry completely before running water through the standpipe. You can also call professional plumbing experts to do the job if handiwork is not your cup of tea.

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