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Old 09-16-2012, 08:43 PM   #1
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Toilet Roof Vent

How high does the pipe need to be in the roof vent? I am wondering if my pipe might be too long to not allow proper venting of the black tank. Here is some pics. I believe it is a 2" pipe. What say you?
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Old 09-16-2012, 09:00 PM   #2
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Hmmm.....I think mine are about level with the flange. You might be on to something there.
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Old 09-16-2012, 09:07 PM   #3
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Do you mean level with the white flange where the black pipe starts showing? Should it be flush? And what would keep mice from getting in, a screen?
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Old 09-16-2012, 09:07 PM   #4
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Quote:
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How high does the pipe need to be in the roof vent? I am wondering if my pipe might be too long to not allow proper venting of the black tank. Here is some pics. I believe it is a 2" pipe. What say you?
The gap between the standpipe and the attached cap should be 1/4 of the pipe diameter for full flow. IE: the gap should be 1/2" clear between them. This is how valves are calculated for full opening also.
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Old 09-16-2012, 09:08 PM   #5
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Do you mean level with the white flange where the black pipe starts showing? Should it be flush? And what would keep mice from getting in, a screen?
Typing same time as you. Mice will meet their fate if they fall into that soup!
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Old 09-16-2012, 09:15 PM   #6
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Should I be able to see the pipe with the cap on? Should I cut it some to be able to see completely through the "window" of the cap? Will that be too much?
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Old 09-16-2012, 09:42 PM   #7
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Eh?
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Old 09-16-2012, 09:57 PM   #8
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Eh?
Just the upper edge of the pipe at top of window. It's not really crical, a two in vent can handle much more than the input source. Like I said 1/2" or close to that the pipe should be clear of the cap top.
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Old 09-16-2012, 10:02 PM   #9
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So if I cut off 1/2" from the top of the flange hole that should help my ventilation?
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Old 09-16-2012, 10:22 PM   #10
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So if I cut off 1/2" from the top of the flange hole that should help my ventilation?
Yes, sounds like cap now is resting on pipe. Cutting 1/2" will be plenty, and help keep out the mice and "fruit flies".
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