Venting Bathroom Sink

Also notice the bathroom sink s individual vent tee s right into the toilet s individual vent.

Venting bathroom sink. An air admittance valve aav opens to let air in when waste drains then gravity closes it to keep sewer gases from escaping back into the room. From the side angle it becomes easier to imagine what these pipes might look like behind your bathroom or kitchen walls. A p trap should be used. If the waste line has a diameter of 1 1 4 inches the vent can be no.

In new construction the simplest way to vent a bathroom group is usually to install a single vertical vent pipe behind the bathroom sink. If venting through the roof is not an option an air emittance valve can be added at the highest possible place in the cabinet below the sink. Install the vent between the sink p trap and the point where the waste line leading from the trap drops to the main sewer. Use plumber s putty on the drain connections to the sink.

For a freestanding sink code may allow a loop vent. Dryfit the pvc drain piping. Prime and glue all pvc pieces for the remainder of the drain. If reventing is difficult and wet venting isn t allowed you may have to install a separate vent pipe through the roof.

Both sinks connect at one point sharing a common true vent to the stack. This works as long as all the plumbing fixtures connect. Clogged venting pipes are why bathroom sink smells like sewer after finding out whether the water was the cause of the sewer like smell probably you have realized this was not the cause. Without venting the negative pressure caused by the flow of draining water can potentially suck water out of the drain trap and allow sewer gases to enter the home.

In the ipc use a 1 5 sanitary tee upside down or in the upc use a 2 x2 x1 5 san tee upside down to make this connection. You thought it was the sink drain but after working on it the problem is not resolved and still bathroom sink smells like rotten eggs. Its purpose is to equalize pressure in the pipes and prevent a vacuum from forming as the fixture drains. That s done with the appropriate sized sanitary tee that s upside down.

The drainpipes collect the water from sinks showers tubs and appliances. A vent is a necessary part of the drain system for any plumbing fixture. The vent pipes remove or exhaust sewer gases and allow air to enter the system so that the wastewater flows freely.