Are Air Admittance Valves Legal in South Carolina

In these rare cases, plumbers use an air intake valve. Air inlet valves (also known as Studor vents) are unidirectional “vacuum-activated” mechanical valves. Most often used on an island sink or vanity, the vents are also located in the attic to prevent the penetration of the roof (as indicated above) on the front roofline. Think about it – when have you ever seen plumbing on the front roofline? Chimney air intake valves shall be located at least 6 inches (152 mm) above the edge of the flood level of the highest device to be evacuated. The air intake valve shall be within the maximum length of development allowed for ventilation. Be careful when advising someone to run drains without vents. What is legal in OK may not be legal anywhere else. We go through a lot of things here. Most of us try to tell owners to check their local code. As I said before, we do not want an owner to do a project, ask for an inspection, and the inspector says, “What is this?” The answer then is, “I was told to do it this way.” Where I am, we cannot do what you have proposed. Nor can we use AAVs without receiving a “papal dispensation.” Note: An AAV should not be altered or sprayed.

I have had plumbers tell us that canal flies and insects are seen on faulty air intake valves. So if you notice a sewer smell under and around your sink or in the attic, the AAV might have let you down. Single, branch air intake valves must be installed at least 102 mm (4 inches) above the horizontal branch drain or the drain of the device to be evacuated. The airflow valve must be mounted at least 6 inches (152 mm) above the insulation materials installed in attics. From the above arrival: For each drainage system in the building, at least one ventilation pipe must be extended into the open atmosphere to reduce overpressure. The size of this vent is not specified because this single vent does not determine the total amount of aggregate cross-section of the ventilation system. The total amount of the cross-section of the combined ventilation openings in the system must correspond to the aggregate cross-section of the building drain. When properly installed, an air inlet valve in the system corresponds to an open vent pipe with the same cross-section as any other vent. Such outdoor ventilation is recommended and is not necessary to be as close as possible to the drain and sewer connection of the building. Check that your air hose does not contain loose connections/connections. Sewer gas leaks can be difficult.

If you know a building inspector in your area, ask them to bring a gas detector for a specific area inspection. Is it a better alternative to normal pipe ventilation? Treated 1 time. Trent, Alison – When we use AAV, we need at least one vent from the plumbing system to push through the roof. Do you have any recommendations to resolve this issue? Thank you for this informative article. My daughter owns a house in Charlotte, North Carolina, and could benefit from your knowledge of AVAs as she has a new water heater and the plumbing is “noisy” when using. Your home has a master bathroom with shower, TOILET, bathtub and 2 sinks, next to the original bathroom with wall-mounted shower/tub, toilet and sink. What do you think? Thank you for your help. Krystal Grooters Is it possible that I will add at least 2 to 90 to each 2-inch ABS pipe to bring it back to the same attic, which is supplemented with an AVV at each location? I can mount other framed walls to get to the same attic. The question is whether there is a limit to the number of 90-degree ABS fittings/counter-angle handpieces I can add to this vertical hose during its diversion process.

One pipe appears to be for the walk-in shower site not yet installed and the other comes from the main drainage line leading to a septic tank, but also from the T`s to this drainage pipe for a future garden bath area. We recently added another story to our home and one of the air vents was not extended to the roof. They offered to cut it and put an AAV. This seemed like a bad abbreviation for solution, but the alternative is a lot of drywall dust and disturbances in my home. Is it reasonable to do so, provided that an AAV matches local codes, or is it simply a hack to circumvent an error? Thank you! An AAV can significantly reduce the amount of ventilation materials needed in a plumbing system. That`s money in your pocket for the plumber. They also allow greater flexibility in the layout of sanitary facilities and reduce the long-term maintenance of the roof. If we do not have a hole in the roof, it is easier to maintain the roof. AVAs have been used effectively in Europe for more than two decades.

However, there are some limitations. I am a licensed home inspector in Texas. I came across a situation to which I can not find a clear answer – situation I inspected a house with a foamed metal frame – all sanitary openings end in the attic with AAV installed.