Do Floor Drains Require A Vent

What is a plumbing vent.

Do floor drains require a vent.

Drain pipes take the wastewater to the soil stack. Today houses are vented through the roof. The true vent is aligned vertically and attaches to your drain line through the roof. If the outlet of the trap were down at the same level as the sanitary main and the piping was installed such that there was a wet vent or circuit vent then the trap would be vented.

If the drain lines in your home have poor venting as in figure a for example water rushing down the drains will pull water from nearby p traps. All the faucets and water appliances in a house use this same system of drains pipes and vents. Vents are a major component in a home s drainage system. It can be done but takes some creativity.

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. As water goes down a drain air is needed to equalize the pressure in the drain line. Through the stack sewer gases are carried up to the roof through vent lines.

Toilet vent option 1. The horizontal vent pipe runs right next to the closet. I believe you re still allowed to use a combination drain vent which means oversizing the drain 2 pipe sizes. This is best implemented if a fixture rests close to the stack and the top floor of your home allowing the stack to serve as a vent.

The drain can also be tied into a drain line that is wet vented. There is another one in the back of the room which is vented. True vents also have no water running through them. In the photo the trap to the left is for a floor drain.

If the drain is within 5 feet of a wall the pipe can be run towards the wall and a vent run up the wall. Just as drain pipes remove water and waste from your home the plumbing vent pipe also known as a plumbing air vent removes gas and odors it also allows fresh air into the plumbing system to help water flow smoothly through the drain pipes however no water. The plumbing vent also known as a vent stack helps regulate the air pressure in your plumbing system. This is the purpose of a venting system.