Floor Drain With Vent

Drain and vent lines must be positioned precisely so you should install them before the supply pipes.

Floor drain with vent.

Venting allows water to pass out of the drains easily. Vents are a major component in a home s drainage system. Through the stack sewer gases are carried up to the roof through vent lines. Roof flashing made from heavy grade rubber lead or sheet metal holds the vent pipe in place.

The same holds true for plumbing vent pipe. As water goes down a drain air is needed to equalize the pressure in the drain line. All the faucets and water appliances in a house use this same system of drains pipes and vents. A re vent or revent pipe in a plumbing drain waste vent or dwv system is an auxiliary vent that is attached to the drain pipe close to an individual plumbing fixture.

The re vent or revent pipe is routed upwards above the fixture and then horizontally over to a tee that attaches it to the main stack vent pipe. If a fixture is close to the stack and on the top floor the upper part of the stack serves nicely as a vent. A true vent is a vertical pipe attached to a drain line that travels through the roof with no water running through it. The true vent is aligned vertically and attaches to your drain line through the roof.

Drain pipes take the wastewater to the soil stack. If you must run drainpipes across a floor carefully calculate the amount of vertical space available. 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. It may be possible to simplify supply runs by moving a vent pipe over a few inches.

This is the purpose of a venting system. 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.