Pip's Island » What Size Pipe For Sink Drain? (Choosing Tips)

What Size Pipe For Sink Drain? (Choosing Tips)

Pipes for sink drains come in a variety of sizes, depending on the type of sink and the purpose for which it is being used.

The most common size pipe for modern drains is 1 1/2 inches in diameter, but there are also 2-inch and 3-inch pipes available. Some older sinks may have even smaller pipes like 1 1/4-inch in diameter but these are not as common.

If you have a standard kitchen sink drain, then a 1 1/2-inch pipe is typically sufficient. However, for a double kitchen sink or a bathroom drain, you may need 2-inch drainage pipes.

What To Consider When Choosing Pipe Size

There are a few things you need to take into account when choosing the right size pipe for your sink drain or bathroom sink drain pipe.

1. State’s Housing Code

Although the standard drain pipe size is 1-1/2″, your state may have housing plumbing codes that require a larger size. Each state has its own housing code, which includes the minimum requirements for plumbing in a home.

The housing code will dictate the standard size of the drain pipe that is required for your bathroom or kitchen drain

2. Plumbing Standard

Another thing to consider is the plumbing standard. The National Kitchen and Bath Association (NKBA) has a plumbing standard that requires a 2″ drain pipe for bathroom sinks.  This is a voluntary standard, but many plumbers follow it.

3. Water Supply And Water Pressure

Water Supply And Water Pressure

You need to take into account the water supply and water pressure. If you have a lot of water going into your bathroom sink, you may need a larger drain pipe to accommodate the volume of water.  Also, if you have high water pressure, you may need a larger pipe to prevent the water from back splashing out of the sink.

A 1 1/2-inch pipe can handle up to approximately three gallons per minute, while a 2-inch pipe can handle up to six gallons per minute. If you have a high water volume or high water pressure, you may need a larger drain pipe.

4. P-Trap

Your sink will have a P-trap, which is a U-shaped fitting that helps prevent sewer gases from entering your home. The P-trap will also dictate the size of the drain pipe you need. Most P-traps are 1 1/2 inches, but you can find them in 2-inch and 3-inch sizes.

5. Horizontal Drain Pipe

The horizontal drain pipe is the pipe that runs from the P-trap to the main sewer line. The horizontal drain pipe can be any size, but most are 1 1/2 inches or 2-inches.

6. Material And Joints

Another thing to consider is the material and joints. The type of material the pipe is made of will affect the diameter. For example, PVC pipes are typically 1-1/2″ in diameter, but the joints or connections are usually 1-1/4″ in diameter.

This is because the PVC pipes have to be glued or welded together, which reduces the diameter.

7. Clogged Pipes

Another thing to consider is the possibility of clogged pipes. If hair often gets stuck in the drain or if you have a bathroom drain pipe that is constantly getting clogged,  consider going up to a 2″ diameter pipe. This will reduce the chance of your pipes getting clogged.

After selecting the right size pipe for your sink drain, you need to install it properly to ensure that it works correctly.

How To Install Pipe For Sink Drain

Installing the right size pipe for your sink drain is not as difficult as you may think. In most cases, you can do it yourself without the need for a plumber.

Pipe Installation Tools

The first thing to do is gather the tools you will need for the job. You will need a hacksaw, a measuring tape, a level, and a pipe cutter. You may also need a hammer and some nails.

Step1: Cut The Pipe

The first step is to measure the length of pipe you need and then cut it to size with the hacksaw.

Step 2: Attach The Pipe

Next, you need to attach the pipe to the P-trap. You will need to use some plumbing tape to make sure the connection is tight.

Step 3: Install The Drain Pipe

Once the pipe is attached to the P-trap, you can install it in the sink. The best way to do this is to use a level to make sure the pipe is level. Once the pipe is level, you can mark the holes for the nails.

Step 4: Use A Pipe Cutter

If you’re having trouble getting the pipe to fit in the sink, you can use a pipe cutter to make the job easier.

And that’s it!

What Size Pipe Do I Need for My Standard Kitchen Drain?

What Size Pipe Do I Need for My Standard Kitchen Drain?

The answer to this question depends on a few factors, such as the type of sink,  the location of the sink, and the type of pipes you’re using. Let’s take a look at each of these factors so you can determine what size pipe you need for your sink.

1. Type Of Sink

The type of sink you have will determine the size of the drain hole.  The most common type of sink is the kitchen sink.

Kitchen sinks have a standard-size drain hole of 1-1/2 inches. If you have a different type of sink, such as a bathroom sink, the drain hole will be a different size. A standard bathroom sink basin and shower drain typically have a drain hole that is 1-1/4 inches.

If you have a single sink, then the most common size pipe for sink drain is 1-1/2 inches. This size can also be used for a double sink or dishwasher, but you may need a 2-inch pipe if the water pressure is high.

If you have a garbage disposal, then you will need a 1-1/2 inch pipe for the drain and a 2-inch pipe.

2. Location Of The Sink

The location of the sink will determine the size of the pipe.  The main drainage pipe is usually located in the basement,  and the pipes that lead to the sink are located in the walls.

For kitchen sink drains, the most common size pipe is 1-1/2 inches. For laundry sinks or pipes attached to the washing machines, the most common size is 2 inches.

3. Type Of Pipes

The most common type of pipe used for sink drains is PVC. PVC pipes are available in a variety of sizes, but the most common size is 1-1/2 inches.

Other types of pipes that can be used for sink drains include polypropylene, copper, stainless steel, and flexible hoses. These pipes are also available in a variety of sizes, but the most common size is 1-1/2 inches.

Now you can choose the right size pipe for your sink drain.

FAQ

FAQ

1. What To Do If Clogs Form In The Drain Pipe

If clogs form in the drain pipe, there are a few things you can do to clear them. The first thing is to use a plunger to try to clear the clog.

You can also try pouring hot water down the drain to melt the clog. If these methods don’t work, you may need to call a plumber to clear the clog.

2. Can You Use A Different Size Pipe For My Sink Drain?

This is a common question that may arise when you’re trying to install a new sink or replace an old one. The answer is yes, you can use a different size pipe for your sink drain. However, you may need to make some adjustments to the plumbing.

For example, if you’re using a 1-1/2 inch pipe for your sink drain, but the drain hole is 1-1/4 inches, you’ll need to use a reducer to connect the two.

If you’re using a brass connector, you’ll need to make sure the brass connector is the same size as the brass fitting on the sink. If it’s not, you may need to get a new brass connector.

You might also need to get a new drain strainer if the one you have is too small or too big. Drain strainers are available in a variety of sizes, so you should be able to find one that fits your sink.

3. What Size Pipe Do I Need For My Septic Tank?

This is a question that many homeowners ask when they are installing or repairing their septic system. The size of the pipe you need will depend on the size of your septic tank.

The most common size pipe for septic tanks is 4 inches. However, consider a larger pipe if your septic tank is larger than average.

Conclusion

Now that you know the different sizes of pipes available and what size pipe is best for your sink drain, you can go ahead and make the purchase.

Beware of clogs, and if you find yourself stuck, don’t hesitate to call a professional. With this new knowledge, your sink will be up and running in no time!

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