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Thread: vents

  1. #1
    DIY Junior Member efs's Avatar
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    Default vents

    is this OK?

    Name:  main_stack_vent_02_reduced.jpg
Views: 189
Size:  40.2 KB

  2. #2
    In the Trades mtcummins's Avatar
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    No. There is a reason vents are the size they are. Your plumber reducing vent lines like this and your other post is not something they should be doing, or any inspector should be approving.

  3. #3
    DIY Junior Member efs's Avatar
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    I guessed so by now... what are my options? Ask the inspector to come back and have a closer look?

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    In the Trades Tom Sawyer's Avatar
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    Is that the only vent in the home? IPC calls for one vent that is half the size of the building drain which in most cases is going to be 1 1/2" to vent through the roof so it may well be to code.
    [B]No, plumbing ain't rocket science. Unlike rocket science, plumbing requires a license[B]

  5. #5
    DIY Junior Member efs's Avatar
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    this the vent from the main stack (which is 4 inches) and it is suppose to combine with other vents (from individual fixtures) in the attic so one vent will go through the roof.

    My concern is whether the vent can be reduced in size on its way upas shown on the picture?

  6. #6
    In the Trades mtcummins's Avatar
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    Quote Originally Posted by Tom Sawyer View Post
    Is that the only vent in the home? IPC calls for one vent that is half the size of the building drain which in most cases is going to be 1 1/2" to vent through the roof so it may well be to code.
    Huh? 1.5" isn't enough to vent even 1 toilet. Pretty sure you need at least an equal total area of venting as drainage, so for a 4" stack, you need a 4" vent, or a 3" and a 2" (I think, not looking at the equivalents right now), or some other combination. Also, I don't think you're allowed to reduce a vent like that... maybe if the total venting load on the line is less than the allowable fixture units for a 1.5" vent, but again, that wouldn't even allow there to be a toilet on this line.

  7. #7
    Homeowner geniescience's Avatar
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    post size of vent and whether this is the only vent.

    efs, please add detail.

    In other web forums I have read that one of your two vent stacks has been cut off from the outside and turned into an AAV. This might be serious.

    key words for web search to find other threads about your problems:
    lazypup efs vent stack
    "... stack is serving only the kitchen and laundry, and they will both be fitted with AAV's, therefore the stack is now only a vertical portion of a vented branch and it does not require a vent."

    and another thread
    lazypup efs bathroom

  8. #8
    Plumber jimbo's Avatar
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    Since you are in country where it snows, they may not allow ANY 2" vent thru the roof.....that is so small it can potenially be snowed over

  9. #9
    Homeowner geniescience's Avatar
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    you = efs or = me?
    efs is in Connecticut.

    Snow happens in many places.
    jimbo, consider deleting this post and your post.

    Quote Originally Posted by jimbo View Post
    Since you are in country where it snows, they may not allow ANY 2" vent thru the roof.....that is so small it can potenially be snowed over

  10. #10
    DIY Junior Member efs's Avatar
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    I have two stacks in the basement. One was (and will be when the addition is done) serving toilets and all bathrooms (2.5) and this is the stack vent on the picture (i.e. the one that was reduced by the plumber to 1.5, maybe 2 I had not measured). My understanding of the code was that the vent size cannot be reduced, hence posting this picture and asking plumbers who know the code for clarification.

    My second stack was serving one kitchen sink and laundry sink and will be serving 2 kitchen sinks (first floor) and one laundry sink in the basement. That stack has been running with 2” (? maybe 3” vent- I had not measured it exactly- it is an old cast iron venting pipe) that has been cut during re-roofing and the plumber has no intention of re-building that vent and told me they will vent both kitchen sinks with AAV (on the individual sinks) and the entire stack with AAV on the stack (in the basement).

    We were not happy with that solution, but were told that inspector has approved that proposition. The inspector had not seen the vent reduction shown on the above picture. All other fixtures are vented individually and the vents are suppose to meet in the attick and have one commont roof exit.

    I also have a vent pipe of 2" that is reduced to 1.5" shown on the pictures in my "masterbath" plumbing post- somebody picked it up but the picture was not clear, but I checked it and the vent size is reduced going up, i.e. I have two fixtures vented with 2" pipe merging with two additional vent pipes of 1.5' each and then reduced to 1.5 " vent going into the attick - is this per code?

    Yes, we have snow- I ami n CT.

  11. #11
    Moderator & Master Plumber hj's Avatar
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    WE do NOT know how your code is written. In your area it may state that you need a ""full size pipe from the sewer connection out through the roof. Or it may say that the "total" AREA, (not diameters), of the vents through the roof must equal the area, (NOT THE DIAMETER), of the incoming pipe, but from the appearance of that vent it conforms to NEITHER requirement. In fact, in many "freezing" areas, the pipe, regardless of its size has to be INCREASED one pipe size, (but a minimum of 4" pipe), from 12" below the roof to its temination above the roof. If you were in Chicago or Arizona, I could tell you which rule applies.
    Last edited by hj; 12-18-2011 at 06:45 AM.
    Licensed residential and commercial plumber

  12. #12
    Plumber jimbo's Avatar
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    Quote Originally Posted by geniescience View Post
    you = efs or = me?
    efs is in Connecticut.

    Snow happens in many places.
    jimbo, consider deleting this post and your post.
    Naturally I was referring to the OP...efs...

    It is his vent we are talking about. And I think it does snow in CT!

  13. #13
    In the Trades mtcummins's Avatar
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    There is no way, in any part of the country, that what you have described is legal. Your plumber and inspector are both doing you a huge disservice.

    Find a highly reputable plumber in the area and have them come do a full inspection of this. From what I've seen so far, there are probably far more errors, or at best lots of bad practice stuff (like all those fittings on your water supply lines).

    You absolutely cannot have the stack just cut off in the attic... it will need to be taken back through the roof, or taken over and tied in with the main stack vent. This vent will likely need to be 3" or 4" through the roof, depending on your local code. We get decent snow here in Pittsburgh, and are allowed 3" if the stack is 3". If its 4" stack, we'd require either a 4" through roof, or a 3" and a 2", or some other combination, as jimbo said, to get the same area venting as the total drain stack capacity. If you have 2 stacks, you will almost certainly need 4" if they let you go through roof with just 1 vent.

    The 1.5" or 2" reduction is a joke.

  14. #14
    In the Trades Tom Sawyer's Avatar
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    Quote Originally Posted by mtcummins View Post
    Huh? 1.5" isn't enough to vent even 1 toilet. Pretty sure you need at least an equal total area of venting as drainage, so for a 4" stack, you need a 4" vent, or a 3" and a 2" (I think, not looking at the equivalents right now), or some other combination. Also, I don't think you're allowed to reduce a vent like that... maybe if the total venting load on the line is less than the allowable fixture units for a 1.5" vent, but again, that wouldn't even allow there to be a toilet on this line.
    If your code is the IPC you need to read section 9. You only need one vent that is half the size of the building drain through the roof and furthermore the distance from water closet to vent is listed as "unlimited" with no size requirement. And BTW technically toilets do not need to be vented as they are a full siphoning, self vented fixture.
    [B]No, plumbing ain't rocket science. Unlike rocket science, plumbing requires a license[B]

  15. #15
    Homeowner geniescience's Avatar
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    Handling snow on roofs is not hard.
    There are millions of houses with vents and with snow on the roof too.

    Quote Originally Posted by jimbo View Post
    ... snow in CT!

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