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.

Can you use a 90 degree elbow on a toilet drain?

If you have to make a 90-degree bend, use two 45-degree fittings and put a small piece of straight pipe between the fittings, if possible. It's fine to have a larger-radius (sweep) 90-degree bend at the base of a vertical drainage stack where the wastewater starts to travel horizontally.

What is the angle for a toilet drain?

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 the best size pipe for a toilet drain?

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.

Can a toilet drain have a vertical drop?

Vertical Drop

When the toilet drain reaches a vertical wall, it drops straight down between wall studs. Although this is a vertical drop, don't use standard 90-degree plumbing elbows, called "hard 90s," to connect the pipes. The sharp corners on these elbow fittings can increase the risk of clogs.

The #1 DWV Plumbing Mistake (and how to prevent it).

How far can a toilet drain drop?

The plumbing code requires drain pipe to be sloped at a minimum of 1/2 inch per foot and a maximum of three inches per foot or vertical. A slope of less than a quarter-inch per foot will cause a lot of drain clogs and a slope of more than three inches will allow the water to drain.

Does toilet drain need to be straight?

Plumbers for many decades have installed horizontal toilet drain pipes that connect to tee fittings. When you flush the toilet, the water and waste head straight down and immediately hit a 90-degree fitting under the toilet flange.

What type of pipe is used for toilet drain?

PVC 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.

Is 3-inch drain OK for toilet?

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.

Can I use 2 pipe for 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 waste pipe have bends?

A toilet drain can have bends. It's recommended to avoid having a 90-degree bend as this will lead to blockages and unwanted damage. Instead, it's best to restrict the bend to 45-degrees and then place a straight pipe before adding another 45-degree bend.

Can a sewer line be too steep?

A slope that is too steep will cause the liquids to run faster than the solids, leading to clogs. A slope that is too shallow does not create enough velocity for proper drainage.

What is the minimum slope for a drain pipe?

It is generally accepted that 1/4″ per foot of pipe run is the minimum for proper pitch on a sewer line. Larger lines such as 8″ pipe actually require less pitch due to the larger circumference of the pipe.

What kind of elbow do you use for a toilet?

Its name relates to “water closet,” a term used by plumbers to mean the commode. A closet bend is a 90-degree toilet elbow fitting, but it doesn't form a sharp angle. Instead, the closet bend has a gradual, sweeping corner that allows waste to flow through the bend without clogging.

Can you use a vent elbow for a toilet?

If the toilet drain does not connect directly to a vent, you must find another way to vent it. If the drain line runs away from the wall where you want the vent, use a reducing Y and a 45-degree street elbow to point the vent line toward the wall. The horizontal vent pipe runs right next to the closet bend.

Should I use a 3 or 4 inch toilet flange?

The 3-inch bottom is the correct size for fitting the schedule 40 pipe most frequently used in home drains. The 4 inches at the top of the flange give you a little extra wiggle room, reducing the chances that water will seep through the wax ring when flushing the toilet.

How far can a toilet be from a vent stack?

According to the UPC, the distance between your trap and the vent should be no more than 6 feet. In other words, for the vent to work properly, it needs to feed into the drain line within 6 feet of the trapways that connect to it.

Can you put a 3 inch flange in a 4 inch pipe?

Bought a standard 3inch and 4inch flange, both do not fit. 3 inch fits in loose, 4 inch sits right on top of the opening.

Are all toilet drains the same size?

Not every toilet requires the same size hole, and clearances also vary, but there is a standard size and placement that works for most models.

Can a toilet and sink share the same drain?

Run the lower sink drainpipe, adding elbows or collar connections as needed to reach the 3-inch drainpipe that runs from the toilet. The configuration depends upon your bathroom layout and the direction of the floor joists, but connect the sink drain to the toilet drain within 6 feet of the toilet, if possible.

Can a toilet and sink share a vent?

Wet venting is most common in conjunction with toilets and sinks; the drain for the sink is also the vent for the toilet. It can also be used for a variety of other applications but due to the following rules this is the most convenient and common situation to run into.

How far can you offset a toilet?

The typical offset is 12-inches for most residential toilets. As a result, the toilet had 4-inches behind the tank.

What is the fall of a 4 inch sewer pipe?

For 4-inch PVC piping and a building sewer less than 50 feet long, the minimum slope is 1 inch in 8 feet, or 1/8-inch per foot, and the maximum is 1/4-inch per foot. For sewers longer than 50 feet, the slope should be 1/4-inch per foot.