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    jeffrepair's Avatar
    jeffrepair Posts: 10, Reputation: 1
    New Member
    		  
    #1

    Jan 24, 2009, 11:51 AM
    Vent Pipe redo
    I have recently cut out the cast Iron pipe in a house remodel and am getting ready to redo the Drainage and vent system in PVC. The Cast Iron pipe was 4" pipe. I will be tying into the existing cast iron that leaves the house for the street with a no hub coupling and then reducing down to 3" pipe to do my main drainage and vent stack. My question is since I had 4" vent pipe exiting the roof into a rubber boot on the roof that is still in good shape, can I, at the end of my main vent stack go back to 4" PVC to exit the roof so that I don't have to mess with the rubber boot and shingles on the roof.

    Thanks,

    Jeff
    biguy49's Avatar
    biguy49 Posts: 3, Reputation: 1
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    #2

    Jan 24, 2009, 12:00 PM

    Shouldn't be a problem. You are not restricting water flow it is just for venting
    Milo Dolezal's Avatar
    Milo Dolezal Posts: 7,192, Reputation: 523
    Plumbing Expert
    		  
    #3

    Jan 24, 2009, 12:16 PM

    Yes, I also think it should not be a problem. Only one question come to my mind: why don't you run 4" all the way to the roof ? What's the reason you want to reduce to 3" ?
    jeffrepair's Avatar
    jeffrepair Posts: 10, Reputation: 1
    New Member
    		  
    #4

    Jan 24, 2009, 02:27 PM
    Quote Originally Posted by Milo Dolezal View Post
    Yes, I also think it should not be a problem. Only one question come to my mind: why don't you run 4" all the way to the roof ? What's the reason you want to reduce to 3" ?
    Thanks for the quick response and helpful answers! I want to do the majority of the runs in 3 inch pipe because it will save me a little bit of money and will fit in between my new joists and subfloor support modifications that I had to make specifically underneath my bathroom where the main vent stack will make its vertical run and the majority of my drains will be meeting.
    afaroo's Avatar
    afaroo Posts: 4,006, Reputation: 251
    Ultra Member
    		  
    #5

    Jan 25, 2009, 12:04 AM

    I agree with Milo and biguy it shouldn't be a problem, good luck.

    John
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