How To Run Vent Pipe For Bathroom Sink

Installing a vent pipe for a bathroom sink is a straightforward plumbing task that can be completed in a few hours. A vent pipe allows air to enter the drainage system, which prevents the sink from draining slowly or creating a gurgling sound. It also helps to prevent sewer gases from entering the home.

Materials You'll Need

Vent pipe (typically PVC or ABS)
Vent cap
PVC or ABS cement
Primer
Hacksaw
Pipe cutter
Measuring tape
Level
Safety glasses

Step-by-step Instructions

Determine the location of the vent pipe. The vent pipe should be installed as close to the sink as possible, and it should be run vertically up through the roof. If possible, the vent pipe should be located on the same wall as the sink.
Cut the vent pipe to length. Measure the distance from the sink drain to the roof, and add 12 inches to allow for the vent cap. Cut the vent pipe to this length using a hacksaw.
Apply primer to the vent pipe and the sink drain. Primer helps to create a strong bond between the pipe and the drain.
Apply PVC or ABS cement to the vent pipe and the sink drain. Cement helps to hold the pipe and drain together.
Insert the vent pipe into the sink drain. Push the pipe into the drain until it is fully seated.
Run the vent pipe up through the roof. Use a level to make sure that the pipe is vertical. Secure the pipe to the wall using pipe clamps or straps.
Install the vent cap. The vent cap helps to keep water and debris out of the vent pipe.
Test the vent pipe. Pour a gallon of water down the sink drain. The water should drain quickly and smoothly, and there should be no gurgling sound.

Tips

If you are not comfortable working with plumbing, it is best to hire a professional plumber to install the vent pipe.
Make sure that the vent pipe is properly sealed to prevent leaks.
If you are running the vent pipe through a finished wall, you will need to cut a hole in the wall. Be sure to use a drywall saw to make a clean cut.
If you are running the vent pipe through the roof, you will need to install a roof flashing to prevent water from leaking into the attic.