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Can You Use 1 1 2 Pipe For Shower Drain [Answered]

I don’t anticipate a clogged shower drain or a sluggish flow of wastewater.

Do you? No, right!

The capacity of the drain pipe is important for the shower drain to function properly. 

Can you use 1 1 2 pipe for shower drain?

Yes, you can but there remains a BUT! A 1 1 2 pipe can be repurposed as a shower drain in extreme instances. It is efficient for downflowing in a tiny bathtub. If the water flow is heavy, it may flood the floor. It is not as effective as a 2″ shower sewer line. It will work in tight shower spaces.

We have all the facts in the section ahead. Like what you’ve seen so far? That’s amazing! Plunge in and figure out everything!

Is It Okay To Use 1 1 2 Pipe as My Shower Drain?

While an excessive draining pipe can prevent regular water flow. A small pipe will overflow the showering floor.

The very first thing that comes to my mind is what size shower drain pipe should be. Although the typical diameter of the drainage pipe is 2”. 

Some people utilize a 1 1 2” pipe. Some are still uncertain about the efficiency of a 1 1 2 inch drainage pipe. 

To explain, we’ve written this article to explain if showers can get a 1 1/2 in. drain or not. If you answer yes, you will learn how to do so.

Steps for Using a 1 1 2 Inch Pipes as a Shower Drain

You must first install a pipe before employing 1 1 2 pipes. Know how to do that?

If not, Don’t worry you have this article to the rescue! Let me break the task into 2 sections to make it more clear. 

Begin installing a 1 1 2 inch piping for the showering drain in the first segment. You can learn about an expert’s viewpoint in the latter segment. Let’s get started with installing.

Steps to Install a 1 ½ inch Pipe

  • Step 1: To begin, put the compression rubber into the drainage outlet. Get it from the front so that it hits the drainpipe’s top too.
  • Step 2: The compression screw must then be secured atop. Insert and twist the screw. The drainage kit should include a wrench for tightening the screw.
  • Step 3: Now, position the strainer on the drainage so that it is just below the showering floor.
  • Step 4: Finally, apply epoxy and allow it to harden.

Expert Tip to Install 1 1 2 inch Pipe for Shower Drain

You must lay a 1 1 2 inch pipe appropriately to install it. It must be placed precisely in the midst of the ground.

The pipe must then extend about 1/6 inches below the flooring. Ensure the proportions are right. Also, learn how to tile around the floor drain for further beautification.

Trace the pipe if required so that you can place the correct piece of the pipes into the drains. If required, shorten the pipeline.

Can Showers Have One And Half Inch Drain

Showers have a flood-level boundary. Showers with many outlets also disperse water arbitrarily from various directions. 

In that instance, a tiny pipe may not be sufficient to adequately drain away. It is why the drainage pipe size is important.

A shower drain grate must typically be 2 inches in length. It is the average size that allows water to flow freely since it is wide throughout. 

Even if the shower box is tiny, a 2-inch hose can take the water efficiently.

Another reason is that 2-inch drain pipes have been permitted by the majority of building regulations. Though the construction regulations differ from one state to the next.   

But in general, 2-inch pipes are accepted in most buildings. Nevertheless, 2-inch pipelines are acceptable in most locations. 

If you question me if you can use a 1 1 2-inch shower sewer pipe? The simple answer is yes. But in some regions and circumstances.

1 1 2-inch drain pipes are usually used in tiny baths. Where the water flow is limited and the capacity allows you to reserve some water. 

Nonetheless, installing a 2-inch line won’t impact. In actuality, it would improve things.

A 1 1 2 inch shower drainage pipe can be used. Unfortunately, the effectiveness is not as high as with the 2″ pipeline. To be realistic, a 2-inch  drain drains water more smoothly than a 112-inch showering outlet. 

Even if you have clogged shower drains. Unclogging a shower drain is an easy process. 

Reasons to Not Use A 1 1 2 Pipe 

As I have tried to give you many reasons to utilize your 1 1 2 pipes. There are many reasons to not use those at all.

Therefore, no matter the number of uses you have, make sure to not use a 1 1 2 pipe if it goes against the rules.

Reason 1: Not Legal and Appropriate

There is a primary difficulty with placing a 1 1/2′′ pipe. Most countries have strict construction requirements.

There has been an analysis conducted on this issue. That shows how ineffective a 1 1/2′′ pipe could be.

It necessitates a correct arrangement. In which the water flows as needed and the drains do not become plugged rapidly. The maintenance is demanding, which is why it is not advocated.

If you are unsure if it is safe to install  1 1/2′′ pipes for the shower outflow. It is strongly advised to go with something authorized. This is one of the deepest concerns that a person may have.

Reason 2: Water Flow Restriction

The 1 1/2′′ pipe will work. But it will cause concerns such as decreased water flow via the shower drain.

This sort of pipe is rarely efficient, hence it is not advised. It will produce obstructions and other difficulties that are against water flow. 

Which can cause used water to sit in the shower tray. This is not only inconvenient but also dangerous.

You prefer issues to be simple, so this happens here. For the drain, look for a 2′′ pipe. This will work just fine and will keep the water running as it should.

Although you may get your 2″ pipes from the authorized items listed below:

Product 1 
Product 2

These are the best ones on the market. And you can use this without any worries!

Reason 3: High Maintenance to Function Appropriately

So, what exactly is the function of a drain? The function is to get the water outside the tub as rapidly as possible.

You don’t want standing water or congested water that takes hours to drain away. As a result, even more, people are becoming concerned.

For this sort of pipe, they put it beneath a shower drain. I prefer something that does not require frequent maintenance. Since this will be pricey in regards to both work and time.

Reason 4: Inadequate For Use

Fitting a 1 1/2′′ pipe for your shower drain is wasteful. It is preferable to use a 2′′ pipe for your shower drain. But why is a 2-inch drain required for a shower?

The reason a shower needs a 2-inch drain is for efficiency. It permits water to flow freely without being congested or stopped up. For this proper drainage system is really necessary. Otherwise might cause water clogging for a low-profile shower tray.

This lowers maintenance expenses and frees up your chance to reflect on the rest of the bathroom. This productivity is something that a 1 1/2′′ showering pipe will not provide.


Is a venting pipe required for a shower drain?

A venting pipe is necessary to clear out the shower water. It allows water to flow to a sewage line or sewage system. Shower water cannot be released effectively or swiftly without the vent pipe. 

How many GPM can a 1 ½ inch drain pipe handle?

Generally, a 1 ½ inch pipe in a ¼ inch per foot area has 4.9 GPM in half-full flow. If it is a PVC pipe, the rate in half-full flow would be around 8.3 GPM. Therefore, the GPM fluctuates between 4.9 to 8.3 GPM depending on the pipe material.

A 1 1 2 inch drain pipe can hold how much GPM?

A 1 1 2 inch line in a 1 by 4 inch per foot area typically has 4.8 GPM at partial flow. When purchasing a drainpipe, understanding the GPM can assist you to evaluate the pipe’s capacity. If it’s a PVC pipe, the flow rate at partial would be roughly 8.2 GPM. 


Hopefully, this answered your question. What if you can use a 1 1 2 pipe for the shower drain?

It is preferable to evaluate factors such as the construction code and its efficacy.

In any case, you can get more assistance from a professional.

Till next time, keep hold!