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Thread: Sleeving PVC for concrete pour?

  1. #1
    Test, Don't Guess! cacher_chick's Avatar
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    Default Sleeving PVC for concrete pour?

    When one pours a slab over a rough-in, what is commonly used to sleeve the drain and vent pipes where they are coming up though the slab?

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    Plumbing Contractor for 49 years johnjh2o1's Avatar
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    Coming up through the slab doesn't require a sleeve but going through a footing does.

    John

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    Forum Admin, Expert Plumber Terry's Avatar
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    Some places will require a sleeve on the pipes in the flat work. They didn't in the past.
    I've seen cardboard, bubble wrap, closed cell foam, whatever works.

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    One who lurks Basement_Lurker's Avatar
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    Plastic drainage systems require provisions for contraction/expansion...if you cement your stacks in place you've partially interfered with that.

    There is a proper product for sleeving a pipe through a slab/footing, but for your purposes, it's easier to wrap the stub several times over in sill plate foam gasketing.
    Broken promises don't upset me. I just think, why did they believe me? -Jack Handy


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    DIY Senior Member dlarrivee's Avatar
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    I used some sill gasket material and tape around my w/c drain, to make sure the socket on the closet flange had enough room to bottom out.

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    Plumber Winslow's Avatar
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    On big jobs i buy the half roll roofing paper, otherwise I just use the cardboard wrapper from the rolls of soft copper. The cardboard works ok but the roofing paper looks more proffessional and is easier to wrap.

  7. #7

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    Very glad you asked this question. I very rarely do new construction plumbing but have a complete job to do this week. In the past I've had lots of problems getting toilet flanges to sit down flush and level because the concrete pours against the pipe and when possible I'll use a flange which will slip inside the pipe or fitting. Most of the time the concrete guys do not get the concrete flat around the stub out. It's not unusual for me to have to use a hammer drill to take out the concrete around the pipe to get the flange to install properly. Sure as heck makes a log of seemingly unnecessary work.

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    Forum Admin, Expert Plumber Terry's Avatar
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    I haven't been asked to sleeve around the water closets. I like to stub up with 4", that way they can pour concrete around the pipe and I can still glue in a closet flange on the inside. I just cut the pipe flush before installing the closet flange.
    I use a 4x3 closet bend below.

  9. #9

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    We use roofing paper as well.
    Plumbing Solutions, LLC
    Your Local Plumber in Columbia, S.C.

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