Local building codes that regulate the materials used in the dwv system have changed over the years so most older homes have a combination of materials.
Vent drain pipe in attic.
A full sized vent is a primary vent where the drain line transitions at some point and becomes the vent pipe that exits the roof.
The drainpipes are made of cast iron galvanized pipe copper or plastic.
Only two plumbing set ups could require sewer pipes in the attic.
If you don t have any other plumbing in the attic then the pipe running through it is the main vent stack.
Vent pipes look like sewer pipes.
The vent pipes are part of the drain waste vent or dwv system of a house or building and they do not carry water inside them.
Seriously though i can t think of any application where in a dw vent may be terminated in an attic space.
Toilet vent option 3.
This is the purpose of a venting system.
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.
The plumbing vent also known as a vent stack helps regulate the air pressure in your plumbing system.
In many an older home this drain pipe is perhaps 4 inches in diameter and stays that size all the way through the roof.
The first would be a bathroom or kitchen in that part of the house and the other would be a.
Instead they serve to equalize air pressure within the dwv system and also release sewer gases into the outdoor air as all vent pipes terminate through the roof.
It s called the p trap and it starts the sewage ventilation process.
The vent pipes remove or exhaust sewer gases and allow air to enter the system so that the wastewater flows freely.
It also allows fresh air into the plumbing system to help water flow smoothly through the drain.
It comes from the bathroom which probably is directly below and it extends.
You ve opened up the cabinets under a sink before to see the p shaped tube directly underneath the drain right.
Just as drain pipes remove water and waste from your home the plumbing vent pipe also known as a plumbing air vent removes gas and odors.
Pipe it out the roof.
Visualizing the pipes inside your wall is made easier if you start from where you can see.
If the vent wall is opposite the drain line use a reducing y and a street elbow.
These drain pipes connect to.
If the vent wall is parallel to the drain pipe install a 45 degree reducing y and a street elbow to point toward the wall.
Understanding the plumbing vent.
You may need another elbow of any degree to position the vertical vent where you want it.
As water goes down a drain air is needed to equalize the pressure in the drain line.
Or even a better idea cap them lol.
