Waste Vent In Attic

I have a customer that we are doing some work in the attic for and i noticed yesterday that the plumbing is vented up into the attic phew and not thru the roof.

Waste vent in attic.

As the water runs down proper venting is required to avoid a vacuum from being created. Water running through these pipes tends to create a suction behind it and that suction can be. The main vent is stack is often but not always a continuation of the soil stack which is a 3 or 4 inch waste pipe that extends vertically down from the uppermost bathroom to the sewer. Notice how the main vent and waste pipe remain separated behind the sink only connecting via the attached went pipe.

I see situations around like this sometimes. This revert is at least six inches above the overflow line and properly connected with a drainage t. The drain waste vent system everyone knows what drain and waste pipes are but not everyone understands the function of the vents. Only two plumbing set ups could require sewer pipes in the attic.

The first would be a bathroom or kitchen in that part of the house and the other would be a. In modern plumbing a drain waste vent or dwv is part of a system that allows air to enter a plumbing system to maintain proper air pressure to enable the removal of sewage and greywater from a dwelling. Drain pipes are those connected to fixture p traps. These empty into larger waste pipes that connect to the sewers.

The vent pipes remove or exhaust sewer gases and allow air to enter the system so that the wastewater flows freely. Waste is produced at fixtures such as toilets sinks and showers. Vent pipes look like sewer pipes. Extra info on the air admittance valve.