Standpipe Drains

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A washing machine with standpipe drain: washing machine drain hose (A), 2" standpipe drain with trap (B), waste line (C), utility sink drain pipe (D), hot and cold supply lines with hose bibs (E), rubber supply hoses to washing machine (F), and utility sink (G).

 

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Continue to Step 1

Overview

In many houses, the washing machine drain hose is hung loosely over the side of the utility sink, but this configuration is frowned upon by building codes. Instead, you should install a standpipe drain that allows the washing machine to drain directly into the utility sink’s drain line. Standpipes with attached P-traps can be purchased at many home centers. A 2"-pipe is required by most building codes. The top of the standpipe should be higher than the highest water level in the washing machine, but not shorter than 34". Hose bibs are installed in the hot and cold supply lines at the utility sink to provide the water supply to the washing machine.

From: The Complete Guide to Plumbing, 978-1-58923-378-2

What You'll Need

Tools:

Reciprocating saw
Utility knife
Waste Y-fitting
Primer & solvent glue
90° elbow
2" standpipe with trap
2 x 4 backer
21⁄2" deck screws
1⁄2" screws
Pipe strap
Hose bibs
Solder
Threaded T-fittings
Torch
Sheet metal
Teflon tape
Rubber supply hose

Materials:

Reciprocating saw
Utility knife
Waste Y-fitting
Primer & solvent glue
90° elbow
2" standpipe with trap
2 x 4 backer
21⁄2" deck screws
1⁄2" screws
Pipe strap
Hose bibs
Solder
Threaded T-fittings
Torch
Sheet metal
Teflon tape
Rubber supply hose

 

Step 1

How to Install a Washing Machine Standpipe Drain

Measure and mark the size and location of a waste Y-fitting in the drain line. Remove the marked section, using a reciprocating saw. Make cuts as straight as possible.


Step 2

How to Install a Washing Machine Standpipe Drain

Use a utility knife to remove rough burrs on the cut ends of the pipe. Dry-fit the waste Y-fitting into the drain line to make sure it fits properly, then attach the Y-fitting using primer and solvent glue.


Step 3

How to Install a Washing Machine Standpipe Drain

Dry-fit a 90° elbow and a 2" standpipe with trap to the waste Y-fitting. Make sure the standpipe is taller than the highest water level in the washing machine (a minimum of 34"). Solvent-glue all the pipes in place.


Step 4

How to Install a Washing Machine Standpipe Drain

Attach a 2 x 4 backer behind the top of the standpipe for support, using 21⁄2" deck screws. Fasten standpipe to the wood support, using a length of pipe strap and 1⁄2" screws. Insert the washing machine’s rubber drain hose into the standpipe.


Step 5

How to Make Water Supply Connections

Install hose bibs in the utility sink supply lines. Turn off water main and drain pipes. Cut into each supply pipe 6" to 12" from faucet. Solder threaded T-fittings into each supply line. Protect wood from torch flame with two layers of sheet metal. Wrap Teflon tape around threads of hose bibs, and screw them into T-fittings. Connect a rubber supply hose from each bib to the appropriate intake port on the washing machine.


Step 6

How to Make Water Supply Connections

Recessed washing machine boxes are available for finished utility rooms. The supply pipes and standpipe drain run to one central location. The washing machine’s hose bibs, supply hoses, and drain hose must remain easily accessible.


 
 

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