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Old 11-30-2009, 06:31 PM   #1
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Vent line for toilet


The vents that normally go through the roof to vent a toilet only go up into the attic. The lack of a vent because to old bleeder valves or whatever they are called are plugged causes a vacuum to form. This in turn causes air to be sucked through the other drains to try to release the vacuum.
QUESTION: Does air need to move freely in and out of the vent in the attic, or does it only need to move inward to release the vacuum. I purchased values that let air into the pipe, but not out. If air can't go up the pipe, will this cause sewer gas to build up and blow the works or what?

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Old 11-30-2009, 06:37 PM   #2
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Vent line for toilet


If the waste/water is moving towards the vent it is pushing air ahead of it
If it's moving away from the vent then its pulling air
Just a simplistic view
Every house should have a roof vent, my house has 2
Relying totally on a mechanical device is not a good idea

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Old 12-01-2009, 09:35 AM   #3
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Vent line for toilet


Your question is a bit confusing. Are you saying that you have Air Admittance valves on the main vent line? Besides not being code anywhere I know of, it can be dangerous. AAV's are a mechanical device and can/will fail over time.
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Old 12-01-2009, 02:43 PM   #4
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Vent line for toilet


My vent pipes end in the attic and do not go through the roof. There is some type of device on them that no longer works that causes a vacuum to form in the drain lines. Do air move freely in and out of those vent lines?
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Old 12-01-2009, 07:15 PM   #5
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Vent line for toilet


Your vents should be extended through the roof. Do it right.
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Old 12-01-2009, 07:44 PM   #6
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Vent line for toilet


Air Admittance valves allow air into the vent pipe to make the waste and water flow properly. Since yours is broken, it is like having a cap on the line, and it is pulling a vacuum. When this happens, air is sucked from the traps on other fixtures and sewer gas enters the home.
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Old 12-03-2009, 09:10 AM   #7
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Vent line for toilet


I'm not sure it's even legal to use an AAV for a toilet. I wouldn't.
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Old 12-03-2009, 09:35 PM   #8
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Vent line for toilet


Your vent pipes should go through the roof. I can't believe someone just extended them to the attic. Not safe.

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