How To Look At A House
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Can a plumbing vent terminate in the attic?
Thursday, August 6, 2020
Yes, a plumbing vent can terminate in the attic. But it must have an air admittance valve at the termination to keep noxious sewer gas fumes from rising into the attic. An air admittance valve lets air into the plumbing vent pipe when needed to allow the drains to flow properly, then closes to keep sewer gas from escaping. Also, the air admittance valve must be at least 6-inches above the attic insulation, and there must be at least one other vent that extends outdoors.
See our blog post What are the code requirements for plumbing vent terminations? for more details on plumbing vent requirements.
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