What is a Floor Sink: Things You Should Know

What is a Floor Sink

A floor sink is an inevitable instrument of a bathroom drainage system. It filters out potential clogging materials to enter the drain pipe.

If the floor sink is not functioning correctly, it can be great trouble for the house residents. The floor sink is the most critical part of the water drain pipe. So, to select an excellent floor sink, you must know the features of the best floor sink.

Let’s talk deep into the main topic!

What is a floor sink?

Floor sinks are sort of protective measures used to increase the longevity of adjacent plumbing stuff. A floor sink is a type of garbage grabber from the washroom or toilet floor. The shape of the floor sink is like a basket.

On the surface of the sink, there are multiple holes to pass out the water. The hole size or diameters are too small. Only water can pass through it. Any materials that can clog the pipe or drain can’t pass through it.

Materials of the floor sink can be varied from stainless steel, MS sheets, or even plastics.

Floor sink drains are of different types, and intended uses are also different. There are different sink types, like the commercial sink, kitchen sink, plumbing sink, restaurant sink, etc.

What is the purpose of a floor drain?

People constantly overlook floor drains. Because the fixtures hide in plain sight, but they are so crucial for your home. They are generally located on the floor of kitchens, basements, laundry, bathrooms, or anywhere.

There is the possibility of water being spilled all over the place and cause a dangerous condition. These drains are built to safely and efficiently direct water to a municipal or sewer so that the floor can stay dry and rooms don’t flood.

The traps prevent sewer gasses and odors from getting through the drain and then to your home.

Does a floor sink need a trap primer?

Yes, all floor sinks need to have a trap primer. It looks like a “U” shape pipe, and you can find it under your bathroom or kitchen sink. You will get an idea of what it looks like.

A trap is a fitting that will provide a liquid seal for stopping the emission of sewer gases.

But there should be a water drain in the trap to create a liquid seal. Even though kitchen and bathroom sinks are used daily, the floor drain shouldn’t necessarily receive water drainage for months.

So it would be best if you made sure that there is enough liquid drainage to prevent sewer gases’ odor.

Can a toilet shower and sink share a vent?

Yes, the toilet and sink can share the same vent. For doing this, you will need a wet vent configuration. It is a waste pipe that will also serve as a vent pipe for those who are thinking about a wet vent.

The first condition for wet venting is that the toilet should be installed downstream comparing to the other fixtures. And the length of the wet vent will not be limited.

For venting the toilet through the sink drain, the sink drain should be 1.5,” and the toilet drain should be 3″. The shared vent area should be at least 2″, and the vent that goes up should be 1.5″. Where the drain connects at the bottom, a fitting must be a ‘Y’ instead of a ‘T’. In this way, the toilet and sink can share the same vent.

Can a floor drain be wet vented?

No, a flor drain cannot be wet vented.  The only fixtures with a damp vent are shower, bids, lavatory(s), bathtub, etc. This excludes floor drain, water closet, or any other fixture that is primarily outside the bathroom.

This also omits a back-to-back lavatory wet venting as the lavatories would be situated in different bathrooms. Two toilets can be wet vented together if only they are in between the range of the same bathroom groups since SECTION 908.2.5 needs.

The code permits only one wet vented trap or fixture drain to discharge the upstream of a dry vent fixture connection.

Does a floor sink need a vent?

Yes, every drain and sink requires a vent starting from your bathroom sink, kitchen sink, laundry, toilet, etc. Vents are the primary allowance of pressure inside the drains for preventing airlock from occurring in the first place.

Vents are an essential factor in the plumbing system. Without vents, the plumbing world will cease to exist. In plumbing vents, prevent airlock, and that is how a toilet works in the first place. So a floor sink must have a vent.

Frequently Asked Questions

Yes, all floor drains have traps, and it is crucial to have one. It helps in filtering waste materials. If you don’t use a trap, it will clog the pipeline.

Yes, it is required in the bathroom to drain all the waste and water. Without it, how will the water pass through right? It’s a must bathroom. Even in some cases, you will find out multiple outlets to ensure a perfect drainage system.

Yes, they tend to need a vent as a vent is essential for plumbing.

You should plumb it in between the fitting and the underside of the drain. It will fit the floor sink perfectly.


By now, you are well aware of the salient features of a quality floor sink. The thing is, without a precise sink, the total drainage system will collapse. So, if you follow our article, then be sure you are safe from any sort of washroom troubles!

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