Can You Use Air Admittance Plumbing Vent Valves on Your Next Construction Project?
The video opens with a scenario where capping off an open sewer vent pipe might seem like a good idea during a remodel. However, Greg discourages this approach because vent pipes are crucial for proper drainage.
What do vent pipes do?
Vent pipes allow air to enter the plumbing system. When fixtures are used, such as flushing a toilet, water rushes through the pipes creating a vacuum. Vent pipes prevent this vacuum by allowing air in, which keeps water flowing smoothly and prevents traps from siphoning. Traps are U-shaped sections of pipe that hold water, creating a barrier that prevents sewer gases from entering your home.
Air Admittance Valves (AAVs) as an Alternative
Air admittance valves (AAVs) as an alternative to traditional vent pipes. AAVs are installed on the drain line and allow air into the system when needed. However, unlike traditional vent pipes that extend to the roof, AAVs do not allow air out.
Potential Issues with AAVs
One potential problem with AAVs is that they are mechanical devices and can fail. A malfunctioning AAV could compromise the venting system and lead to venting issues.
Another concern is that AAVs may not be up to code in all areas. Greg has not seen AAVs being used in California and suggests checking local building codes before installing one.
Traditional Vent Pipes
Vent pipes typically run from the drain pipe vertically through the attic and roof. This allows sewer gases to vent out of the house and prevents them from entering your living space.
Additional Information
Cost: AAVs are typically less expensive to install than traditional vent pipes.
Maintenance: AAVs require regular maintenance, such as cleaning and inspecting the flapper valve.
Appearance: AAVs are not as aesthetically pleasing as traditional vent pipes.
Code compliance: Before installing an AAV, be sure to check your local building codes to ensure that it is allowed and meets all requirements. In conclusion
AAVs can be a good alternative to traditional vent pipes in some situations. However, it is important to weigh the pros and cons before making a decision. Be sure to check with your local building code officials to ensure that AAVs are allowed in your area and meet all applicable requirements.
