Venting A Bathroom Sink Drain

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.

Venting a bathroom sink drain. The drainpipes are made of cast iron galvanized pipe copper or plastic. 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. Its purpose is to equalize pressure in the pipes and prevent a vacuum from forming as the fixture drains. This is the purpose of a venting system.

A p trap should be used. The vent pipes remove or exhaust sewer gases and allow air to enter the system so that the wastewater flows freely. 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. You will need a 1 5 trap adapter and a 1 5 plastic tubing p trap sometimes called trim trap.

When there s a lack of venting in places like your kitchen sink or bathroom sink an s trap can actually be created whether you have the traditional p trap or not. When installing your vents it s highly recommended that you plan out your drain lines to minimize the risk of clogging. The waste pipes remove water and material from the toilet. The same holds true for plumbing vent pipe.

A note on the main drain. Both kitchen 1 1 2 inches and bathroom 1 1 4 inches are smaller than the rest of the drain system on purpose. A vent is a necessary part of the drain system for any plumbing fixture. 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.

Because a standard sink drain exits through the wall behind the sink it sits higher than the tub shower and commode drains making it an optimal spot for a vent. Prime and glue all pvc pieces for the remainder of the drain. On a sink that would be either the rim or overflow hole. The horizontal vent pipe runs right next to the closet.

This makes our bathroom sink drain 1 5 the vent 1 5 the trap arm 1 5 and the p trap 1 5. Toilet vent option 1. This is because a lot of the times the drain of the sink when it goes out of visibility behind drywall it typically heads straight down into either the floor if your in a basement or into the joists of the room below. When a vent that connects one.

Here s how to connect the plumbing under your bathroom sink. The drainpipes collect the water from sinks showers tubs and appliances. Dryfit the pvc drain piping.