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What are the code requirements for plumbing vent terminations?
Tuesday, June 19, 2018
Plumbing Vent Pipe Code
The plumbing drain system in a home has to “breathe” in air so it can flow smoothly. But the vent piping can also emit noxious sewer gas, so it is necessary to terminate the pipes in a safe location where the sewer gas will not come back into the house.
A vent through the roof must terminate a minimum of 6 inches above the roof surface or 6 inches above any anticipated snow accumulation. Vents through walls have to terminate at least 10 feet above the ground or adjacent surface, but cannot be below a vented soffit. Here’s one example of what not to do.
When a vent terminates directly below a window, door, or air intake, it must be at least 4 feet under it or 3 feet above it, unless the vent is 10 feet or more away. Vents are also required to be at least 7 feet above a roof when it is also used as a walking surface.
Vent terminations near any air intakes on a roof must be a minimum of 3 feet above the intake opening, or at least 10 feet away.
Vents terminating at an air admittance valve in an attic must be a minimum of 6 inches above the insulation.
Side wall vents are required to be protected from entry of birds or rodents, usually by a coarse mesh screen. Also, the use of vent terminations for anything other than vent termination is prohibited.
These standards are at Section “P3103 - Vent Terminals” of the Residential Edition of the Florida Building Code (FBC) and the International Residential Code (FBC).
Also see our blog post How many plumbing vents through the roof are required by code?
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