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what can I do if Cheater Air Admittance Valves are not allowed?

R

Remington

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Joined
Apr 16, 2018
Messages
44
Location
Los Angeles
The following is a link to a floor plan of the 2nd floor level and Patio Deck of a single family residential in Los Angeles County, California.

see Floor plan <-- link

The bathrooms are shown ghosted because they are on the 1st floor level. The two bathrooms would need to have a long complicated vent pipe because there's no real good way to route the pipes because the 2nd floor is slab-on-grade except where it overlaps the 1st floor.

I saw on the forum somewhere that Cheater Air Admittance Valves are not allowed by code. Is this true?

If so what would be a good day to vent plumbing?
 
If the property is located in the unincorporated area of Los Angeles County or a city that contracts with LA County for it’s building department, you can submit a request to install an air admittance valve to LA County Public Works Building Safety.
 
Remington said:
Cheater Air Admittance Valves are not allowed by code. Is this true?
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Yes and no UPC 301.2.5 and 301.3 will allow them for a specific use if approved by the AHJ. I have permitted them when requested in writing on remodel projects. However I ask the Plumber to state they will be installed according to the IPC Section 918.

Note: Modern AAVs are sometimes confused with the older "Automatic Air Vent" - a spring-operated device that accomplished the same task, but suffered from unreliability owing to its mechanical nature. Automatic air vents are no longer permitted for use; air admittance valves are not defined as mechanical devices, and are permitted to varying degrees in most plumbing codes.

AAVs can be a great solution for venting problems, but should never be the first choice. In fact, they should be the absolute last possible choice - a traditional, passive, external venting system will always be superior (especially when it comes to positive pressure), and is often required by code. AAVs should always be considered a last resort.
 
The International Plumbing Code allows AAV's, but that does not help you in your area. AAV's are prohibited in the Uniform Plumbing Code, but perhaps your building department will make an exception if you ask nicely.
 
ICE said:
If the property is located in the unincorporated area of Los Angeles County or a city that contracts with LA County for it’s building department, you can submit a request to install an air admittance valve to LA County Public Works Building Safety.
Click to expand...

Can the vent pipes on the first floor be routed through the 2nd-floor bottom plate and vertically through the hardy wall in order to vent to the second-floor attic?
 
Remington said:
Can the vent pipes on the first floor be routed through the 2nd-floor bottom plate and vertically through the hardy wall in order to vent to the second-floor attic?
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Cutting a generic second floor bottom plate for plumbing is not a problem. Cutting a Hardi Wall is not allowed.
 
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