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Thread: Coupling PVC and Hubless Iron DWV

  1. #1
    Jack of all trades, Master of none KULTULZ's Avatar
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    Question Coupling PVC and Hubless Iron DWV

    I have to replace/reroute a vertical waste (3" hubless iron) stack (3 story condo) as the origional builder did not route it properly (or support it properly) taking needed space in the wet wall (want to install recessed cabinet in that position.

    It is SCH 40 PCV in the slab with PVC couplings above the ceiling and the actual pipe is cast iron hubless. Are there specialty PCV fittings that need to be used with the hubless pipe? It presently has a cleanout (PVC) at the base that actually juts out from the wall. I need to turn that cleanout ninety degrees (if allowed) to have a flat wall and still be accessible to snake. Is this permissable as long as an access door (18") is available allowing the cap to be removed within the wall and a snake inserted?

    I want to have all the parts handy before I cut.

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  2. #2
    Plunger/TurdPuncher kingsotall's Avatar
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    Can you post a pic so we can see how much you are working with within this wall...

  3. #3
    Jack of all trades, Master of none KULTULZ's Avatar
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    Yes, give me a day or two.
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    Master Plumber Redwood's Avatar
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    I would consult with the condo board and property management on this one before doing anything.

    Quite frequently a licensed plumber is required on projects of this nature.

  5. #5
    Moderator & Master Plumber hj's Avatar
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    PVC under the floor and castiron in the walls is somewhat unusual and is the reverse of the way it is usually done. It almost implies that this is a "fire rated building" and if so you may not be permitted to use PVC for your revision. IN ADDITION, that 3" line could be the drain from the upper levels and if so your "rerouting" around the medicine cabinet could create a problem.

  6. #6
    Jack of all trades, Master of none KULTULZ's Avatar
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    Quote Originally Posted by Redwood View Post

    I would consult with the condo board and property management on this one before doing anything.

    Quite frequently a licensed plumber is required on projects of this nature.

    Quote Originally Posted by hj View Post

    PVC under the floor and castiron in the walls is somewhat unusual and is the reverse of the way it is usually done. It almost implies that this is a "fire rated building" and if so you may not be permitted to use PVC for your revision.

    IN ADDITION, that 3" line could be the drain from the upper levels and if so your "rerouting" around the medicine cabinet could create a problem.
    I appreciate both of your concerns-

    This is a fire rated building (three story). All other waste (and vent) is PVC. From reading TECH MATERIAL from CHARLOTTE PIPE, I believe the purpose of the cast iron waste is sound suppression. Every other drain in the condo can be heard through the walls.

    This is one of those low income buildings and the construction was very shoddy. She bought into one (one hell of a deal) and her first question was wood floors and new kitchen cabinets.

    This is when I began discovering what truly poor workmanship went into this building. The wall in question had a bulge and the cleanout trap cap showed through the drywall. Upon opening the wall, whoever did the rough-ins was not very concise. The waste is not in align with the vent (3"). To make the wall flat, I need to straighten the waste (I will supply photos later) and construct a custom wet wall.

    I believe I am going to replace the waste pipe with PVC and use Quiet Rock on the wet wall(s) to suppress the sound. The builder has CHL hubless cast iron waste intermingled with PVC. There is (was) no support of the vertical stack that I see. Of course I will put riser clamps on the new pipe and support the stack when I cut it.

    I will get back with photos.
    Last edited by KULTULZ; 03-10-2009 at 06:10 AM.
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