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Old 08-21-2007, 01:41 PM   #1
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Older sewer w/ backwards trap


I have an old home that I was told had a backwards trap just outside the foundation. There is a vent coming from it up under my porch which smells from time to time. I was told by a plumber years ago to remove this trap and vent. Question is if I remove this vent, do I have to put another vent in the line, like in the bushes out from under the porch? If I remove the trap I still will have a cleanout inside were the line goes through the wall.

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Old 08-21-2007, 04:21 PM   #2
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Older sewer w/ backwards trap


Vent lines are supposed to exit the home through the roof. Yours may be an "extra" vent and unnecessary. The trap you have, actually, is illegal by todays standards as the forms a double trap. If you have a vent line that exits the roof, you should be able to remove the trap and vent. These traps were called "house traps" years ago.

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Old 08-21-2007, 04:50 PM   #3
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Older sewer w/ backwards trap


I'm pretty sure every house is still required to have a house trap. I've seen them installed in all the new construction homes I've been in recently. They are usually inside and the vent goes through the roof but I have seen them outside in a pit and coming out from the wall (I've only seen that in commercial buildings though).
As far as it being backwards it may be a directional trap (I know new ones are, I"m not sure about older ones) installed backwards, or the vent may be on the wrong side of the trap, it should be on the house side, or he may be talking about something else. I'm sure someone with more knowledge will come along.
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Old 08-21-2007, 08:09 PM   #4
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Older sewer w/ backwards trap


Quote:
Originally Posted by majakdragon View Post
Vent lines are supposed to exit the home through the roof. Yours may be an "extra" vent and unnecessary. The trap you have, actually, is illegal by todays standards as the forms a double trap. If you have a vent line that exits the roof, you should be able to remove the trap and vent. These traps were called "house traps" years ago.
FYI, house traps are still required in some areas.
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Old 08-21-2007, 08:12 PM   #5
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Older sewer w/ backwards trap


As for removing a house trap, call the local plumbing inspector and see if it is still required or if it can be removed. And yes the vent would be on the side closest to the house.
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