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Thread: Double trapping

  1. #1

    Default Double trapping

    i just bought a farmhouse ..

    there's a vent at the exterior foundation wall, that i assume is a house trap ..

    i really hate the gurgling sinks i have, ......

    can i trap these ..??
    there are no other vents ...

    whaddabout .. Air Admittance valves ..??

    thanks ..
    Last edited by Reliable Heating; 01-18-2008 at 08:37 AM.

  2. #2
    Plumber Cass's Avatar
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    What You are referring to is a whole house trap, i think, as you used the term vent and trap to describe the same item and they are not the same.

    You can eliminate the whole house trap.

    Be sure All fixtures are trapped and vented first.
    Last edited by Cass; 01-18-2008 at 08:41 AM.

  3. #3
    Plumber patrick88's Avatar
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    I would think about removing the house trap. It will cause clogs from grease and toilet paper etc...

    I would not trap anything to the house trap vent it is only there for the house trap.
    I'm just starting to work with an old friend of mine to bring solar electric and hot water systems, wind turbines, Flex Fuel Boilers, batteries, hydroponic gardening, books, pellet grills and more. Also the parts for DIY installation.

  4. #4
    DIY Senior Member mikept's Avatar
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    Was that kind of setup common way back when?

  5. #5
    DIY Senior Member MG's Avatar
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    My neighbor removed the whole house trap from the main and now when the wind blows right in the back yard you can smell sewer gas...as it blows down off the roof.

    Note: I am a DIY'er and not a professional. My posts here are observations / opinions and may or may not be in accordance with your local ordinances.

  6. #6
    In the Trades Gary Swart's Avatar
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    It is my understanding from past discussions that whole house traps were used extensively years ago. They are not advised any longer and most opinions given seem to favor removing them and using today's standard p-traps for all fixtures. Understand that a toilet has it's p-trap built in. All traps need to be vented. AAVs are legal in some local areas and not in others. Even when legal, there must be at least one vent through the roof to the outside. Major concern that plumbers express about them is that they are mechanical devices and can/will fail at sometime. When used, an AAV there must be access to it. In other words, you can't hide it inside a wall. Your description implies that there are no vent in the house at all. It really seems to me that you have more to deal with here than even an DIYer with plumbing experience should be tackling. I would urge you to consult with a plumbing contractor and have him evaluate your total house needs.

  7. #7
    Moderator & Master Plumber hj's Avatar
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    Default trap

    The house trap was NEVER intended to take the place of individual fixture traps, and does not perform the same function as they do. It was ONLY to keep sewer main sewer gases out of the house system.

  8. #8
    DIY Senior Member Marlin336's Avatar
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    Quote Originally Posted by Cass View Post
    You can eliminate the whole house trap.
    Check the local codes on that one first. They are still used even on new construction here.

  9. #9
    Plumber patrick88's Avatar
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    The house traps were used alot. They served the purpose to keep a house from venting the whole street or neighbor hood. Most houses can remove them today. I would check with your inspector to make sure you don't need one today If you have neighbors close to you up wind like on a hill. I have removed many house traps with no ill effect, but I'm sure there are houses that need to keep them.

    If you neighbor removed his trap and things are starting to smell he should put it back or everybody else should remove there house trap. With the low flow toilets out, and the extra thick toilet paper house traps are more a pain than they are worth. I have cleared many main drain clog through a house trap by augering the trap only.
    I'm just starting to work with an old friend of mine to bring solar electric and hot water systems, wind turbines, Flex Fuel Boilers, batteries, hydroponic gardening, books, pellet grills and more. Also the parts for DIY installation.

  10. #10

    Default

    Quote Originally Posted by Gary Swart View Post
    It is my understanding from past discussions that whole house traps were used extensively years ago. They are not advised any longer and most opinions given seem to favor removing them and using today's standard p-traps for all fixtures. Understand that a toilet has it's p-trap built in. All traps need to be vented. AAVs are legal in some local areas and not in others. Even when legal, there must be at least one vent through the roof to the outside. Major concern that plumbers express about them is that they are mechanical devices and can/will fail at sometime. When used, an AAV there must be access to it. In other words, you can't hide it inside a wall. Your description implies that there are no vent in the house at all. It really seems to me that you have more to deal with here than even an DIYer with plumbing experience should be tackling. I would urge you to consult with a plumbing contractor and have him evaluate your total house needs.
    thank you for your kind reply, Gary ...


    "house traps " are common 'round here .....in 1900's construction

    the mfgr's made the type sold here most commonly to be vented externally at the foundation wall, so yea, there are No internal vents, i.e. the AAV question ..

    and .. DIY NOT
    ... Mechanical Contractor, son ..

    just notta resi plummer

  11. #11
    DIY Senior Member Marlin336's Avatar
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    Quote Originally Posted by patrick88 View Post
    The house traps were used alot. They served the purpose to keep a house from venting the whole street or neighbor hood.
    That's probably why we still have them. Lots of houses close together, often in hilly areas. Neighbors would be shooting one another over the smell. And yes, the house trap is often the culprit when their is a stoppage. A lot of those stoppages would be in your sewer line if they weren't conveniently in your house trap which is very easy to auger through the fresh air vent.

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