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Thread: Riser Clamp Size

  1. #1
    DIY Senior Member DougB's Avatar
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    Default Riser Clamp Size

    I want to cut out a section of cast iron waste pipe, and before doing so, install a riser clamp on the floor above.

    The pipe is 3 1/2" OD - I figure this is what they call 3" waste pipe?

    All I've been able to find on the net (and Grainger) are 3" riser clamps. What do you think?
    If a hammer won't fix it, it's an electrical problem.

  2. #2
    Retired Defense Industry Engineer jadnashua's Avatar
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    Default

    I think, but do not know for certain, when they are referring to a 3" riser clamp, they're referencing the ID of the pipe...most of those I've seen are two parts that clamp around the pipe, and the OD has some leeway. Most drain pipe has about 1/4" walls, so 3.5" is about right for the OD.
    Jim DeBruycker
    Important note - I'm not a pro
    Retired Defense Industry Engineer; Schluter 2.5-day Workshop Completed 2013, 2014

  3. #3
    Forum Admin, Expert Plumber Terry's Avatar
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    It would be a 3" riser clamp

  4. #4
    Moderator & Master Plumber hj's Avatar
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    Default

    A 3" waste pipe would take a 3" pipe clamp.
    Licensed residential and commercial plumber

  5. #5
    DIY Senior Member DougB's Avatar
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    Default

    Thanks guys.
    If a hammer won't fix it, it's an electrical problem.

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