How to Secure Washing Machine Standpipe to Sink Drain


If a washing machine and a kitchen sink are connected to the same drain, you might be able to vent both of them. You can do it with only a single vent if they are close enough. In such a case, you can join their ducts before bringing them together to form the main vent stack.

The plumbing code mandates the installation of one on every drain. It establishes guidelines that limit its size and the distance it must be from the fixture trap.

As long as you play within the rules, you may use several different setups for each given scenario.

In this guide, I will be discussing how to combine a washing machine standpipe with a sink drain. I will also discuss the steps you need to perform to connect the standpipe of the washing machine with the sink drain.

How to Secure Washing Machine Standpipe to Sink Drain

Can a Washer and Sink Share a Drain?

In many different configurations for basements, the available space connections are limited. It is conceivable for both to share the same drain.

If a plumbing fixture known as a “tee” is not already present, it will be necessary to install one before being able to connect a sink to the drain inlet.

It makes attaching the drainpipe for the sink to the standpipe for the washing machine.

Can a Washing Machine Drain into a Sink Drain?

A Y-fitting or equivalent fitting can be used to permanently connect the drain hose of the washing machine to the sink drain.

You may confidently secure the drain hose. Ensure that the drainpipe is at least 2 inches in diameter before connecting the washing machine.

The water pushed from the washer will overwhelm a smaller drain pipe.

A P-trap and a standpipe must be built if the line is less than 2′′ in diameter to prevent water from backing up and causing a flood.

Can You Combine a Washing Machine Standpipe with Sink Drain?

Yes, you can combine a washing machine standpipe with a sink drain. You can install a new waste trap.

Because it has two stoppers, you will be able to connect your washing machine and dishwasher separately to either one of them.

A hose splitter is another method that you may utilize to accomplish this task. It is a little gadget in the shape of a Y that enables you to connect your dishwasher and washing machine to a single waste line.

After that, you attach this pipe to your fixture in the usual manner.

How to Connect Washing Machine Standpipe to Sink Drain

The washing machine drains into a laundry sink in many laundry rooms. The drain line is commonly hanging on the sink’s edge.

The washing machine’s water drains into the sink straight. If your drainpipe has a 2-inch diameter, you can use the sink drain to connect your washing machine.

Drain pipes that are too small will be overwhelmed by the washer’s water output. P-traps and standpipes must be built to prevent water from backing up into the system.

Tools Required:

  • Waste Y-fitting
  • Tape measure
  • Permanent marker
  • Reciprocating saw
  • Safety glasses
  • Utility knife
  • 90-degree elbow
  • Primer and solvent glue
  • 2-inch standpipe with trap
  • 1/2-inch screws
  • 1/2-inch deck screws
  • Pipe strap

Step 1: Measure the Length

Determine the length of the waste Y-connector. Remove 1 inch from the given measurement.

Step 2: Locate the Installation Spot for Y-Fitting

Determine the part of the drainpipe where the Y-fitting will be installed. Mark the predetermined measurement on the waste pipe using a measuring tape. Create as straight lines as possible.

Step 3: Cut the Drain Pipe

At the marked locations, cut the drain pipe using a reciprocating saw. Using a utility knife, remove any thorns from the cut area.

Step 4: Place the Y-Fitting

Dry-fit the Y-fitting to the two drain pipe segments. Y-Fitting needs to be rotated to parallel the opening faces to the drain pipe. Remove additional lines as needed.

Step 5: Use Primer and Glue to Attach the Y-Fitting

Prime and adhere the Y-fitting to the drainpipe using solvent adhesive. Open the primer and glue solvent.

Using the lid-attached swab, clean the inside corners of the Y-fitting to attach to the drain line. Position and install the Y-connector on the drain line.

Step 6: Dry Fit Elbow to the Opening on the Y-Fitting

Dry-fit a trap-equipped standpipe to a 90-degree elbow. The 90-degree elbow and trap installation make three-quarters of a circle when viewed from the front.

The standpipe has a vertical axis when assembled correctly.

Step 7: Measure the Distance

Determine the distance between the floor and the standpipe’s apex. Mark the distance at 34 inches.

Remove the standpipe and cut along the line to make a standpipe of the correct height for washing machine drainage.

The standpipe size must be at least 34 inches to prevent water backup.

Step 8: Remove Sections

Remove the dry-fit segments from the Y-fitting. Using a primer and solvent adhesive, affix the parts together.

Step 9: Secure the Standpipe

Secure the Standpipe with sink

Secure the standpipe by securing it to the wall with a pipe strap approximately 2 inches from the top edge. Using 1/2-inch wood screws, hold the pipe strap in place.

A backer board is a 1-by-4-inch or 2-by-4-inch piece of material fastened to the studs on both sides of the standpipe.

Additional Tip:

If there is no sewage drain available for tapping, the concrete floor will need to be removed. Afterward, the tap on the main sewer house drain might need to be shifted.

All of this is necessary to install the standpipe. There is also the possibility that an air admittance valve or vent pipe has to be added to the structure. If this is the case, you should consult with an expert.

To Secure the Washing Machine Standpipe, is a Hose Required?

The International Residential Code mentions the drain hose connection for washing machines.

However, the manufacturer’s installation instructions specify that you must fasten the drain hose. It helps prevent it from escaping the standpipe at the beginning of the instructions set and flooding the floor.

Numerous manufacturers include fastening devices in the package of installation materials.

The easiest approach is to use a zip tie to secure the drain hose to one of the fill hoses at the washing machine faucet box.

Can You Connect Washing Machine Waste to Sink Waste?

Can You Connect Washing Machine Waste to Sink Waste

Yes, you can connect washing machine waste to sink waste. Utilizing lengthy hoses and attaching them to your sink’s waste trap is a simple method for installing waste pipes.

Industry professionals do not recommend it since it may take up a significant amount of space in the cabinets under the sink.

The hoses often need to be made unusually long, which tends to droop and allow stale water to sit in them.

How to Connect a Washing Machine and Laundry Sink to the Same Drain?

Plumbing connections can be constrained in many basements. The washing machine and the laundry sink can use the same drain in this scenario.

If it isn’t already there, you must install a plumbing fixture known as a tee before you can connect a sink to the drain inlet.

You can now hook up your washing machine’s drainage line to your kitchen sink’s drainpipe.

1. Sewer Tee Installation

Step 1: The same drain can be used to connect a washing machine and a sink.

Ensure that the sewer pipe entrance next to the sink and washing machine is clean and clear.

In most cases, this is an open-ended pipe that stands alone. You must construct a tee connection for the sink inlet if one does not already exist.

Step 2: Both the sink and washing machine should have their water shut off, so do both simultaneously.

You will install two separate supply valves for hot and cold water in each fixture. Cut off the water supply by turning the knobs clockwise on the end of the valves.

Step 3: Remove the washing machine’s power cord from the wall socket.

Step 4: About halfway down, cut the pipe in half. Using a metal-cutting blade on a rotary tool is recommended for cutting metal pipes.

You can cut PVC pipe with a hacksaw or other saw. The lines should be sanded down to remove any burrs.

Step 5: A tee fitting should be attached to the sewer pipe. Use a rubber coupler and hose clamps to connect a metal tee to the line.

You can use screwdrivers to tighten the clamps. You can use primer and PVC adhesive to secure a PVC pipe.

Step 6: The top of the tee should be connected to a straight drainpipe component. Glue another PVC pipe in place or secure it with a rubber coupling on a metal pipe.

Using a clamp, fasten the line to a nearby stud or wall to stabilize it.

2. Connect the Washing Machine and the Dishwasher

Step 1: The washing machine’s drain hose should be on the sewage pipe’s top. Use a hose clamp to hold it in place.

Step 2: Set up the p-trap and drain pipe between the sewer and tailpiece and secure them.

Determine if the lines need to be trimmed further before final installation.

You can use a hacksaw and a rotary tool with a metal cutting attachment to cut PVC pipes and metal pipes, respectively. Remove any blemishes with sandpaper.

Step 3: The tee inlet can be used to connect the sink’s drainpipe. Using primer and adhesive, attach the PVC pipe to the wall.

Apply pipe thread compound before screwing the drainpipe into the tee.

Step 4: In between the tailpiece on the sink’s underside and the drainpipe, install a p-trap and secure it in place.

Couplings should be slipped over the end connectors and tightened with a wrench.

Step 5: Rotate the sink and washing machine water supply valves counterclockwise to turn them on.

Step 6: The washing machine can be plugged back into the electrical outlet.

Can You Install a Laundry Sink Drain Without a Trap under it?

Can You Install a Laundry Sink Drain Without a Trap under it

Connect the P-trap to the drainage by attaching it straight to the pipe, and then you guide the P-exits trap’s into the drain you already have.

It is not a good idea to position the P-trap such that it is below the exit drain.

This requires the water to be forced out by gravity rather than allowing it to flow naturally downwards.

Additionally, the top of the standpipe needs to be raised at least 30 inches above the trap weir of the standpipe. It needs to be higher than the flood rim of the sink.

Washing Machine Drainage Options

For a long time, washing machines have been a part of our daily life. A lot of time is saved by using this method.

Many new washing machine models have emerged as a result of technological advancements.

However, the washing machine’s drainage system is ignored by the commercials. Inadequate attention is paid to the plumbing, which results in a lack of coordination and the use of less standard ways.

1. Clothing Tub

Using a laundry tub as a clothes washer seepage is probably the best option. The average height of the washer’s channel hose is between 25 and 30 crawls.

As a result, the washing machine’s neighboring clothing container should be placed under 12 to 18 crawls.

You should replace dirty water with clean water when the wash cycle operates. Proper cleaning is required. It is recommended as a drainage option by high-quality washing machine manufacturers.

2. Standpipe

It is one of the simplest and least expensive options for a washing machine seepage framework. The additional benefit is that it saves a considerable amount of space.

Simply attach a standpipe to the washing machine’s waste hose so that you may easily channel used water out of the device.

Make sure the line you’ll be using is thick enough to allow water to flow through it without a hitch.

3. Slop Sink

This type of setup connects the channel hose directly to a washbowl. Normally, the hose is swung over the side and the sink’s ridiculous edge.

The lowest half of the sink must have a substantial air hole between the channel hose’s finish and the bottom of the sink. An air hole prevents backwater from re-entering your washing machine and making you sick.

Why is Standpipe Overflowing?

Standpipe Overflowing

Some of the most typical causes of an overflowing washing machine standpipe are:

  • Blocked lines.
  • A sudden increase or decrease in water pressure.
  • Sudden reduction or increase in water usage.

1. Kinked Discharge of a Washer

You’ll have to spend a lot of money on repairs and time away from your family to fix the house.

2. Small Drain Pipe of Washing Machine

Your washing machine’s drain pipe should have a 112″ diameter. Neither is the 114″ drain hose attached to a washing machine intended for machine venting; rather, it is for draining water only.

For this reason, you want the drain pipe to be slightly larger than the diameter of the hose.

The white P-trap arm that joins your washing machine to the sink should never prolong the drain from your washer.

Your 7-inch drain hose may collapse every time water exits the washing machine. It results in a backlog in your laundry room if you’ve used the last several inches of the hose.

3. No Presence of the P-Trap

The P-trap guarantees that trash, waste, and other foreign materials don’t enter the pipes as part of your plumbing. The smooth flow of water down a drain helps prevent drain obstructions.

You can also use P-traps to prevent sewer gas from entering a residence. Water can back up in your home and cause structural damage if the trap is clogged or doesn’t have enough slope.

Washing Machine Drain Standpipe Height

Washing Machine Drain Standpipe Height

The installation manuals of most products provide a recommendation for a minimum ceiling height.

GE’s 30-inch minimum permits you to secure the drain hose to the back of the machine near the machine’s top using a plastic “anti-siphon clip.” Both companies recommend a maximum height of 96 inches.

Final Thoughts

Combining a washing machine standpipe with the sink drain is easy to do. You can utilize various ways according to your liking to combine these two.

I’ve discussed all the necessary steps to connect a washing machine standpipe with the sink drain. You will find other information related to the connection of washing machines too.

Lisa Burks

This is Lisa Burks, the Author. I provide free informative sink and faucet guides. I hope you love your time here.

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