Knowledge Builders

what is the standard size of a toilet drain pipe

by Shanie Koepp Published 2 years ago Updated 1 year ago
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The standard size for a toilet drain pipe is 3 inches in diameter, but drains up to 4 inches in diameter are sometimes used. Typically, 3-inch pipes carry the water to the toilet, but a 4-inch pipe may be used to move wastewater out of a house to a sewer or septic tank.

What is the minimum diameter of a toilet drain pipe?

When combined with a laundry tub, the drain pipe must be a minimum of 2 inches in diameter. And toilet requires a drain pipe of 3 inches in diameter, unless two toilets are on the same drain and...

How wide is a normal toilet pipe?

The standard size of a toilet drain pipe is 3 inches in diameter, but the drain can be up to 4 inches in diameter. The drain pipe is usually connected to a 3-inch schedule 40 toilet drain pipe. Let's Get It Fixed!

What is the average size of a toilet sewer pipe?

Toilet sewer pipe sizes range from 3 inches to 6 inches, depending on how many washrooms you have in your home. The drainpipe attaches to the bathroom basin, which is 3 inches. There is no method of reducing the tube’s diameter at any point in the plumbing.

How to lay pipe for a toilet?

Water Supply Pipes

  • Choose an existing copper pipe that carries cold water near the toilet and shut off the water to that pipe. ...
  • Assemble a supply line for the toilet with 1/2-inch copper pipe and fittings. ...
  • Terminate the water supply line with a shut off valve. ...
  • 4-inch PVC pipe
  • Wye fitting
  • PVC threaded adapter
  • PVC cement
  • Reciprocating saw
  • Closet flange
  • Screwdriver

More items...

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Should toilet drain be 3 or 4-inch?

In new construction, 4-inch drains can be installed from every toilet, or you can run a 3-inch drain line from a toilet to the home's main 4-inch drain pipe -- the line running from the house to the sewer or septic system. Older homes may have only 3-inch drains, so that's what you have to work with.

What type of pipe is used for toilet drain?

PVC PipesPVC Pipes PVC piping is generally used as part of a sink, toilet, or shower drain line, though it's sometimes used as a home's main water supply pipe.

How big is the pipe from the toilet to the sewer?

Standard Toilet Sewer Pipe Sizes If your home has one or two toilets, the standard toilet sewer pipe size is 3 inches. The sewer pipe connects to the toilet flange beneath the toilet, and this flange is a standard 3 inches. You cannot reduce the size of the pipe anywhere along the piping.

Can a 2-inch pipe be used for a toilet?

Unless two toilets are on the same drain and then it must be a 4-inch plumbing waste pipe, the toilet requires a drain pipe of 3 inches in diameter. Unless there is a toilet discharging into the piping, systems with less than nine units can use a 2-inch pipe.

Can a toilet drain have a 90?

You can have a 90-degree fitting under a slab, but it needs to be either at the base of a stack, as I've already described, or it can be under a toilet that sits on a slab.

How far can you run a toilet drain?

Tie the waste line from the new toilet directly into the stack if the toilet is within six feet of the stack and the waste line is 3 inches in diameter. If the waste line is 4 inches in diameter, the toilet can be as far as 10 feet from the stack.

What is the proper slope for a toilet drain?

¼ inch per footImproper drain slope The ideal slope of any drain line is ¼ inch per foot of pipe. In other words, for every foot the pipe travels horizontally, it should be dropping ¼ inch vertically.

What is standard toilet supply line?

Typically they are 3/8” in diameter, but toilet supply line size can vary in length, usually anywhere from 9” to 20”.

How many toilets can be on a 3 inch drain?

As a horizontal branch 3" is good for 20 DFU's or 4 bathroom groups.

How far can a toilet be from the main stack?

If your waste line has a diameter of 3 inches, you can place the toilet within six feet of your stack. The toilet can also be as far as 10 feet from your stack, if the diameter of the waste line is 4 inches.

How do you install a toilet drain pipe?

2:206:18How To Plumb a Bathroom (with free plumbing diagrams) - YouTubeYouTubeStart of suggested clipEnd of suggested clipAs a reduction in size and this fitting is a great choice under a four inch flange. Then our trapMoreAs a reduction in size and this fitting is a great choice under a four inch flange. Then our trap arm connects right into this three inch santee. Now we've got a vertical to horizontal transition.

How do you run a toilet drain pipe?

0:062:01How To Vent & Plumb A Toilet (Step by Step) - YouTubeYouTubeStart of suggested clipEnd of suggested clipRight under the center of our plumbing wall the discharge side connects to the building drainMoreRight under the center of our plumbing wall the discharge side connects to the building drain further downstream. This way then we've got a two inch street forty-five here for the vent.

How many toilets can you put on a 3 inch drain line?

As a horizontal branch 3" is good for 20 DFU's or 4 bathroom groups.

How big is a toilet drain pipe?

The drain pipe in your toilet carries waste away into the home's main drain line. The standard size for a toilet drain pipe is 3 inches in diameter, but drains up to 4 inches in diameter are sometimes used.

What size drain pipe do I need for a house?

Most homes, however, use a 4-inch drain or stack pipe. Four-inch pipes are also used to support multi-family units with up to 500 fixtures. Only large industrial buildings, apartment complexes or high rises have a need for larger-diameter drain pipes. Advertisement.

What is PVC pipe?

In most homes, PVC drain pipe is used instead of metal pipe. Plumbers use piping-size tables to determine the size of the pipe to be needed. Advertisement.

What Is a Toilet Flange?

A toilet flange, also known as a closet flange, is a pipe fitting that mounts the toilet to the floor. It also connects the closet bend to the drainpipe to let water and waste flow out. The toilet flange allows you to secure the basin without mounting directly onto the floor.

What is a shim in a bathroom sink?

A shim can be a thin tab made of plastic, rubber, or wood that can slide under the basin. Once you check for leaks and find the uneven spots, slide the shims in by hand and distribute them evenly. Be sure to loosen the bolts to ease shim insertion, and refrain from tapping the ends with a hammer.

How long does it take for wax seal to cure?

Theoretically, once the toilet basin is fully installed and tested, it’s immediately available to use. However, the wax seal needs time to cure and any silicone, caulk, or grout used. A good rule of thumb is to wait a few hours, depending on the sealants involved.

Can a toilet break loose?

A loose or wobbly toilet can break loose the wax seal or cause someone to injure themselves. Reseating the entire basin is time-consuming and might not even be necessary to level it off. Luckily, using simple shims can help with this problem and possibly be completed with fewer steps.

Can you use a toilet with a bolt?

You could use the toilet immediately if necessary, provided you don’t sit or put weight on the basin. A basin secured to the floor with bolts only is available for use, as well . However, this would not be the best idea, as sudden weight and shifting could loosen the wax ring.

Can you use wax ring on RV toilet flanges?

For RV toilet flanges, there are wax ring models available for installation. However, since wax can melt in extreme temperatures, bolt or glue models are a better choice. Repair and replacement are much simpler since there’s no concrete subfloor involved.

Can you use washers on a screw?

While it is always ideal to use the proper size screws, you can also use washers in a pinch. If you don’t have the correct screws and need to finish the repair, you can use some tightly fitted washers. This can help create a secure connection, at least until you can get the proper screws.

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1.What Size Pipe For A Toilet Drain? (Find Out Now!)

Url:https://upgradedhome.com/what-size-pipe-for-a-toilet-drain/

9 hours ago  · The drain pipe from the closet bend to the drain stack has a diameter of 4 inches. In most residences, this is the normal size pipe for toilet drains, and all main drain stacks are typically made up of 4-inch-diameter pipe. Some homes, however, may have a …

2.Standard Pipe Sizes for Toilets | Hunker

Url:https://www.hunker.com/12003119/standard-pipe-sizes-for-toilets

17 hours ago The standard toilet drain pipe size is 3 inches, but 4-inch drain pipes are becoming more common. In terms of removing waste, a 4-inch drain pipe is better than a 3-inch drain pipe, but …

3.What is the standard size of a toilet drain pipe?

Url:https://guillaumeboivin.com/what-is-the-standard-size-of-a-toilet-drain-pipe.html

4 hours ago  · The standard size for a toilet drain pipe is 3 inches in diameter, but drains up to 4 inches in diameter are sometimes used. Typically, 3-inch pipes carry the water to the toilet, but …

4.What Is the Average Size of a Toilet Sewer Pipe? - SFGATE

Url:https://homeguides.sfgate.com/average-size-toilet-sewer-pipe-86351.html

9 hours ago  · 3-Inch Toilet Drain Pipes. The 3-inch toilet drain pipes are the industry standard. Most of their users claim that they are affordable and effective. If you don’t have any unusual …

5.Standard Toilet Flange Dimensions (with Pictures)

Url:https://upgradedhome.com/toilet-flange-dimensions/

5 hours ago  · The sewer pipe connects to the toilet flange beneath the toilet, and this flange is a standard 3 inches. You cannot reduce the size of the pipe anywhere along the piping. If your …

6.Videos of What Is the Standard Size Of a Toilet Drain Pipe

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7 hours ago The standard size of a toilet drain pipe is 3 inches in diameter, but the drain can be up to 4 inches in diameter. The drain pipe is usually connected to a 3-inch schedule 40 toilet drain pipe. The …

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