Venting A Bathroom Sink

Dryfit the pvc drain piping.

Venting a bathroom sink. 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. Above the intersection with the sink the vent pipe simply acts as a vent for both fixtures and so can be smaller 1 5 in diameter. It loops up an around before connecting to the drain pipe allowing ample ventilation to take place just behind your fixture.

Prime and glue all pvc pieces for the remainder of the drain. Vanity venting in new construction the simplest way to vent a bathroom group is usually to install a single vertical vent pipe behind the bathroom sink. Also notice the bathroom sink s individual vent tee s right into the toilet s individual vent.

There is also a wet vent but these are mostly reserved for tubs that sit close to a stack and may not be allowed by your locality s code. That s done with the appropriate sized sanitary tee that s upside down. Subscribe to this old house.

It basically involves tapping into the existing drain trap configuration to install an aav via a new sanitary tee fitting and a short upward extension pipe. While it is possible to install an aav hidden inside walls during remodeling work it is more common to install them right under the sink cabinet as an adaptation of the pipe joining the drain trap to the. 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.

A p trap should be used. Use plumber s putty on the drain connections to the sink. The loop vent is a solution for many freestanding sink codes.

Ask this old house plumbing and heating expert richard trethewey helps add ventilation to a bathroom sink that is unvented.