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    mr handy joe's Avatar
    mr handy joe Posts: 2, Reputation: 1
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    #1

    Jul 1, 2009, 02:46 PM
    Cast iron to pvc transition for main vent stack
    Hello to all. I am adding a 2nd story to my home. I have a 4" cast iron vent that y's off to pick up a galvanized 2" pipe for the bathroom below. I have a 2 part question. (A) The vent runs horizontally at a 90 for about 6 feet, then goes up through the roof. I would like to cut this out, relocate the run straight up from where the y fitting is now. Is this acceptable? (B) I would like to do this using 4" pvc. Would I be able to do this transiton with a sleeve? Thank you in advance to all for your replys.
    Milo Dolezal's Avatar
    Milo Dolezal Posts: 7,192, Reputation: 523
    Plumbing Expert
    		  
    #2

    Jul 1, 2009, 03:17 PM

    Yes, it is acceptable. Actually, it is better when you eliminate horizontal section of the vent.

    Yes, you can extend existing Cast Iron with PVC or ABS. Just use appropriate Fernco shielded coupling and keep the diameter of new pipe consistent with the old one.
    mygirlsdad77's Avatar
    mygirlsdad77 Posts: 5,713, Reputation: 339
    Plumbing Expert
    		  
    #3

    Jul 1, 2009, 03:27 PM

    Milo said it. You will be just fine.
    speedball1's Avatar
    speedball1 Posts: 29,301, Reputation: 1939
    Eternal Plumber
    		  
    #4

    Jul 1, 2009, 03:32 PM
    it is better when you eliminate horizontal section of the vent.
    Milo, Can you explain to me why it's better. I had always thought since it was simply air that bends and the position of the pipe didn't make any difference as long as the pipe was clear to the outside. Where did I go wrong? Thanks Milo

    Joe,
    You will transition from cast iron to plastic using a No-Hub Band or a shielded coupling, (see images) Good luck, Tom
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    mr handy joe's Avatar
    mr handy joe Posts: 2, Reputation: 1
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    #5

    Jul 1, 2009, 05:32 PM
    Thank you gentleman for your timely feedback
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