How big should a washer drain pipe be?

The standard washing machine drain size is 2 inches, and the minimum requirement is 1 1/2 inches. Modern washers typically require a larger drain, and you may need a larger drain if it’s connected to your kitchen sink.

What is the code for washing machine drain pipe?


Standpipes shall be individually trapped. Standpipes shall extend not less than 18 inches (457 mm) but not greater than 42 inches (1066 mm) above the trap weir. Access shall be provided to standpipes and drains for rodding.

What size PVC is used for washer drain?

The two-inch pipe is commonly used to drain a shower stall or washing machine, and it may be used as a vertical stack for a kitchen sink. A three-inch pipe is what’s used in homes to pipe toilets.

Does a washing machine need a 2-inch drain?

Drain and Trap Requirements

A 2-inch drain pipe is required for all washing machines. The former requirement of 1 1/2-inch pipe is not enough to handle the fast drainage of modern washers. As with all plumbing fixtures and appliances, a washing machine drain pipe must also contain a P-trap.

How big should a washer drain pipe be? – Related Questions

How far can you run a 2 inch drain?

When builders look only at the table without reading the text, they find that a 2-inch-diameter drain can run a maximum distance of 8 feet to the vent.

Can you use PVC for washer drain?

The ends of the pipes are attached to the threaded drain opening with a nut and washer. Putting a washer on a PVC pipe is a straightforward procedure similar to putting a washer on a bolt; a threaded nut is placed on the pipe and screwed onto the end of a drain opening or drain basket, or onto a threaded pipe end.

Does a clothes washer drain need a vent?

All plumbing fixtures—including washing machines—must be vented. Improperly vented drains can be sluggish and noisy, and can emit hazardous fumes. Properly vented drains allow the P-trap to do its job: prevent sewer gases from escaping into your home.

What type of PVC for washer drain?

Install a 2-inch PVC T-fitting on the horizontal end of the P-trap. This should be in the stud wall right behind the washing machine.

Should a washing machine drain pipe be sealed?

While sealing around the discharge hose will prevent gases from escaping the standpipe, it doesn’t allow the necessary airflow into the standpipe during the draining process. This results in overflowing and possible flooding of the home and/or the siphoning of water from the washing machine.

Are washing machine drain pans required by code?

Drain pans aren’t a requirement for your washer, but they are an inexpensive and simple way of protecting your home by catching small leaks and reducing the amount of water damage from broken hoses. If your laundry room is upstairs, a drain pan is recommended to protect against leaks that can seep into the rooms below.

How much drop does a washing machine drain need?

The minimum horizontal slope is 1/4 inch per foot and the max is 3 inches per foot unless vertical. the inlet of the washer drain must be above the height of the washer. This is usually 36 to 38 inches minimum for floor seated washers.

What size waste do I need for washing machine?

40mm 4 times and 50mm over 6 times. The way to find out if 32 and 40 will be adequate would be to do a test run with with water intensive programmes. Just fill the machine, then terminate the programme and allow it to pump out.

Is a 1.5 drain OK for a shower?

Current plumbing codes (IPC as well as MA Plumbing Code 248 CMR 10 for instance) need 1.5 inches to drain for a tub with a shower. The tub can drain at leisure and the shower function when in utilize, with flow-limiting showerheads, fall within the flow rate that a 1.5” drain can handle.

Why do showers need a 2-inch drain?

In most cases, a 2-inch pipe is recommended to ensure the drainage system works effectively and there is no danger of overflowing. In some cases, for example, when installing a shower in a bathtub, a smaller drain size may be sufficient as long as you do not mind excess water around your feet.

How many gallons per minute can a 1.5 inch drain handle?

A 1 1/2 in. drain can easily accommodate 4.9 gpm for cast iron and 8.3 gpm for PVC.

How many fixtures can be on a 2-inch drain?

Section 710 Drainage System Sizing
Total for horizontal branch Total for stack greater than three branch intervals
11/2 3 8
2 6 24
21/2 12 42

How much water can flow through a 2-inch drain pipe?

1-inch pipe: 210 gallons per minute. 2-inch pipe: 850 gallons per minute. 3-inch pipe: 1,900 gallons per minute. 4-inch pipe: 3,400 gallons per minute.

How many GPM can a 2-inch drain handle?

1106.2 Size of Storm Drain Piping
PIPE SIZE (inches) CAPACITY (gpm)
2 34 44
3 87 111
4 180 231
5 311 331

Does every drain need a vent?

Whether you’re putting in a tub, toilet, sink, or floor drain, they all need a plumbing vent on the drain to make it work properly. If there is no vent, a number of problems may occur: The fixture without a vent may drain slowly. The drain will likely make gurgling noises.

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