How big is the pipe for a toilet?
A lavatory requires a 1 ¼ minimum drain and vent pipe size.
Toilet drain pipes are usually 3 inches in diameter. Washing machines and laundry sinks generally need 2-inch drain pipes. Shower and bathtub drain pipes are usually 2 inches in diameter. Sinks usually require a 1.5-inch drain pipe.
The standard toilet rough-in is 12 inches, but don't assume you have a 12” rough-in without measuring! Some older homes come with 10” or 14” rough-in sizes. You may also find 10” rough-in sizes in powder rooms, half baths, or other small bathrooms to save space.
Is it wrong to use a 2-inch pipe for a toilet? Unless you have a macerating system, a 2” pipe will frequently be clogging. The way some people use toilet paper, even a 3” toilet drain is problematic.
Is a 3-inch drain pipe enough for a toilet? Yes, it is the minimum for residential. Pipes are sized by 'fixture units'.
The most common CTS fittings are 1/2 inch, 3/4 inch, and larger sizes because they're used for household plumbing more frequently than ID nominal size parts.
It is easy to check the size of your pipes. First, check on the pipe itself. Often it will be labeled or written on the side or a valve. If not, you can measure copper pipe size, and other water pipe sizes use the String Method.
Knowing the correct rough-in size will ensure your toilet will fit and work correctly. To measure the rough-in for your toilet, measure from the wall behind to the toilet to the middle of the closet bolt caps on your current toilet. The closet bolts are the bolts holding your toilet to the floor.
Conclusion. In short, it is possible to connect the toilet drainage line and the shower drainage line, as long as they both have separate waste trap arms. However, do note that combining them may also lead to blockages, which can cause smells to come from certain drains.
| DIAMETER OF PIPE (inches) | MAXIMUM NUMBER OF DRAINAGE FIXTURE UNITS (dfu) | |
|---|---|---|
| 21/2 | 12 | 20 |
| 3 | 20 | 48 |
| 4 | 160 | 240 |
| 5 | 360 | 540 |
What is the pipe that goes from wall to toilet?
The pipe that connects a toilet pan to the wall or plumbing is called a flush pipe, and the rubber part on the end is called a flush cone.
According to plumbing code, drain pipe has to be sloped a minimum of 1/4-inch per foot and a maximum of three inches per foot or vertical. A slope of less than 1/4-inch per foot will cause constant drain clogs and a slope of more than three inches will allow the water to drain without the solids.
A best practice is to install the toilet flange on top of the finished floor. If you install the toilet flange flush with the finished floor, or even below the finished floor, leak paths will form, because the flange won't be at the correct height to accept the horn at the bottom of the toilet.
A majority of toilets will use the two inch flapper; however three inch flappers have become popular in recent years and can be found in newer toilets manufactured since 2005. An easy reference for determining your toilet's flapper size is to look at the flush valve drain opening at the bottom of your tank.
No more than four water closets or bathroom groups shall be installed on a 3" horizontal fixture branch. EXCEPTION: Where the water closets are rated 3.5 gallons or more per flush, no more than two water closets or bathroom groups shall be permitted.
For male pipe threads, be sure to measure the outside diameter at the widest point of the threads. For female pipe threads, measure the inside diameter at the widest point of the threads. You can then use these measurements to find the right size in a nominal pipe size conversion chart .
A tee, the most common pipe fitting, combines or divides fluid flow. Tees can connect pipes of different diameters, change the direction of a pipe run, or both. Available in various materials, sizes and finishes, they may also be used to transport two-fluid mixtures.
3/4 supply is good for most houses. If you have low pressure with taps on 3/4 may be small. If you have big house with many lavatories and people 3/4 may be small.
If you also check commercial kitchen sink product data, you will also find that the typical connection size is 1/2” for both cold and hot water. For the individual fixture piping, you should use a 1/2” pipe but for the H-I, you should use a 3/4” pipe.
The standard rough-in is 12 inches, though you may encounter 10-inch and 14-inch rough-ins in older homes. You should find the rough-in measurement in the new toilet's product information.
Can I put a 12 inch rough-in toilet in 14 inch space?
Most toilets that advertise as a 14", install using a 12" bowl. This leaves the bowl pretty far out into the room. TOTO at least gives you the option to shift the bowl back closer to the wall. And yes, they work great!
On average, the cost to install a toilet ranges between $400 and $800. One-piece toilet labor costs range from $100 to $300. Two-piece toilets cost slightly more to install than one-piece toilets because of the additional labor. A two-piece toilet typically costs $200 to $300 to install.
There are several common causes for a sewage odor coming up from the shower drain, including a clog in the drain line, a dry or dirty P-trap, mold or biofilm build-up, and leaking drain lines in the walls, ceiling, or under the floor.
A three-inch pipe is what's used in homes to pipe toilets. The four-inch pipe is used as the building drain under floors or in crawlspaces to transport all the wastewater from a home out to the septic tank or sewer. The four-inch pipe may also be used in a home if it's capturing two or more bathrooms.
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.
Without a vent to allow pressure to escape from the plumbing system, harmful sewer gases can build up and make it difficult for water to move through the pipes efficiently. A clogged plumbing vent creates problems not because it doesn't allow air in, but because it won't let it out.
Any sidewall or nearby fixture must be at least 15" away from the toilet's flange. However, 15" is the absolute minimum. A 15-inch distance from the vanity, shower, tub and back and side walls are required to accommodate the toilet flange.
There are three common drain sizes for bathroom sinks, 1.25", 1.5" and 1 5/8 (1.625"). You need to select a drain that is the same size or SMALLER than the hole in your sink. For example, if you have a sink with a drain hole of 1.75", than any of the drains 1.25", 1.5", or 1.65" will work.
PVC is commonly used for the drain lines of sinks, toilets and bathtubs. Other common applications include indoor plumbing, underground plumbing, vent stacks, main water supply lines, high-pressure piping, and storm drainage systems.
Plugged at the U-pipe, the fresh water blocks sewer gases and lets them harmlessly leak out the plumbing vents. Every plumbing fixture needs to have a vent to work properly. Bath tubs, toilets, washing machines and kitchen sinks need the biggest plumbing vents.
Should there be a gap between toilet and wall?
Most codes require at least 15 inches (measured from the center of the toilet) from any side wall or obstruction and not closer than 30 inches center to center to any other sanitary fixture. (The NKBA actually recommends 32 inches.) There should be at least 24 inches of clear space in front of a toilet or bidet.
A small amount of clean water coming from the tank will remain at the bottom of your toilet bowl at the end of the flushing cycle. This happens because your toilet's drain is designed with a "S" bend. This bend traps some of the water after your flush and effectively stops odours from rising up from your drainpipe.
Soil and waste pipe system design and installation
The “fall” or “drop” should be between 1/40 (1cm down for every 40cm across) and 1/110. Too steep (1/10) then the water runs quicker than the solids so doesn't wash them away (ugh!).
12 inches is the most common toilet rough-in size. However, it's useful to know that toilet's also come in: 10-inch rough-in. 14-inch rough-in.
The bathroom fitters are unanimous—if you're looking for a high quality finish, with a better seal against water damage, then always tile the floor first.
These flanges install on the outside of either 3" or 4" pipe and can be used without needing access from below. To install an Oatey Cast Iron Closet Flange: Place it over the pipe so the gasket secures to the pipe. Tighten the integrated fasteners to the pipe to secure the closet flange.
Toilets are designed to efficiently empty the contents of the bowl through a downward motion into the drainpipe, but the force of the flush cycle also creates a fine spray of particles in the air. Those particles easily spread when a lid is left up during flushing.
No more than four water closets or bathroom groups shall be installed on a 3" horizontal fixture branch. EXCEPTION: Where the water closets are rated 3.5 gallons or more per flush, no more than two water closets or bathroom groups shall be permitted.
Most codes require at least 15 inches (measured from the center of the toilet) from any side wall or obstruction and not closer than 30 inches center to center to any other sanitary fixture. (The NKBA actually recommends 32 inches.) There should be at least 24 inches of clear space in front of a toilet or bidet.
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.
What is the best pipe for a toilet drain?
Polyvinyl chloride pipes (PVC) are commonly used as part of a sink, toilet, or shower drain line. Its plastic tubing is ideal for this kind of usage because it protects the water from rust and corrosion better than other types of pipes. This capability also makes PVC pipe incredibly durable.
Oversized piping may contribute to health risks such as Legionella, sewage clogs, and odor fade. As time moves forward, plumbing fixtures and the use of plumbing systems changes, and new risks are discovered and studied.
Guidelines for Toilet/Bidet Placement
Code Requirement: A minimum distance of 15 inches is required from the centerline of a toilet and/or bidet to any bath fixture, wall, or other obstacle.
Leave at least 15" of space between the shower and toilet or other obstacle. If you have a swinging door, take into consideration nearby fixtures.
