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Thread: Quick Question about No-Hub

  1. #1
    DIY Member glnow's Avatar
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    Default Quick Question about No-Hub

    Is it legal to no have no-hub connection on a vertical vent line that is behind a wall?

    I have a metal vent pipe with a hairline crack that needs to be addressed.

  2. #2
    Moderator & Master Plumber hj's Avatar
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    quote; Is it legal to no have no-hub connection on a vertical vent

    The word "no" in the question does not make sense. Of course it is legal to have them in walls, otherwise we could NEVER install a No-Hub waste and vent system. If "no" meant "not" then the question is illogical, if not ridiculous.

  3. #3
    DIY Member glnow's Avatar
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    Whoops, many apologies for the confusion caused by the typo in my original post.

    Yes, I was checking to see if it was OK to have the no-hub union behind the finished wall and it sounds like that is allowed.

    Do I need to add some additional bracing to support the vent pipe when I cut into it, so that the pipe above my cut doesn't come tumbling down? If yes, what do I use?

  4. #4
    In the Trades Gary Swart's Avatar
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    The obvious answer to that is YES. I am assuming the vent is cast iron, and you do have to clamp it very, very well. Cast iron is very heavy and a flimsy half-a**ed attempt won't cut it. The vent is likely only supported by itself, so when you cut it, it loses that support and will come down fast and hard.

  5. #5
    DIY Member glnow's Avatar
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    Understood. What type of clamping/strapping system should be used here?

    Sorry, I should say that I'm not going to do myself, it's beyond me and I'll be going with a pro.
    But this info will help me be sure it's being done correctly.
    Last edited by glnow; 03-08-2011 at 10:54 PM.

  6. #6
    In the Trades Tom Sawyer's Avatar
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    The best thing would be a riser clamp but I don't think the big box stores carry them.

  7. #7
    Moderator & Master Plumber hj's Avatar
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    How the vent pipe is installed ABOVE the cut determines whether it is already supported or not. Only someone on site can make that determination, but I have cut very few cast iron lines which were NOT already supported by the piping configuration above the cut.

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