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Old 01-24-2009, 11:01 AM   #1
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adding AAV ?


I have 2 low flush toilets on different drain lines and vent stacks in different levels of the house both vented on 1 1/2" to attic where they join a 3" main vent stack. Although on separte lines these two both clog frequently.

I have a third toilet in line but vented direct on 3" stack which never causes problems.

After much investigation I can only assume there is a venting issue casing the frequent clogging. Since the 1 1/2" vents are burried and one is in line with a sink,one not can I add an AAV as well to increase ventilation for the two troublesome toilets?

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Old 01-24-2009, 02:48 PM   #2
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adding AAV ?


are the two problem toilets on the same branch off of the stack, or are there to seperate tees in the stack.

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Old 01-24-2009, 02:49 PM   #3
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adding AAV ?


stupid question, i should have read more thoroughly. sorry
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Old 01-24-2009, 02:51 PM   #4
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adding AAV ?


You can add an AAV, but it seems fishy to me that venting would cause clogs so easily, are there any other fixture with problems
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Old 01-24-2009, 03:50 PM   #5
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adding AAV ?


Thats the issue. No other item on the upper 1 1/2" vent stack. It is in an outside wall and runs a total of about 12 ft before branching into the 3"

The lower level toilet vents backward from the basement through the sink drain 3' away from what I can tell, on a different stack in an inside wall and up to the attic as well where it intersects the 3".

Unless these two small diameter branches in the attic are freezing intermittently before they reach the 3" main I cannot figure out any other scenario for this frequent blockage. But I am sure I've had blockage summer and winter.
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Old 01-24-2009, 03:52 PM   #6
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adding AAV ?


And no , shower on upper level bath runs continually no buildup, sink is fine. Both vented on their own runs.
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Old 01-26-2009, 12:11 AM   #7
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adding AAV ?


1. Have the 2 toilets always been a problem or is this relatively new?

2. Are the 2 problem toilets the same model as the one that works fine?

3. Is the water level in each tank at the recommended water level mark?

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