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DCV and airflow

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  • 14-03-2024 12:45am
    #1
    batman_begins
    Registered Users Posts: 2 ✭


    I have a demand control ventilation system installed after building an extension (not a heat recovery system). I have a good relationship with my builder and he has performed well throughout. However he has been struggling to resolve a number of snags despite a few attempts and his theory is the issues are down to the DCV and the effects on airflow.

    We have vents in the windows and have left the vents open in the bathrooms where the DCV is. The two bathrooms share the same waste pipe running down the side of the house. Waste from one toilet is washing up in the bottom of the bowl downstream. My builder has fixed everything he can think of and is puzzled by what it could be, and has began questioning if there’s not enough airflow from the vents and a vacuum is sucking waste back up the toilet bowl. Is this possible?

    Likewise I have no DCV in my converted attic space. I find it hard to notice a draft in the eaves. But on occasion when winds are high, it seems like wind is blowing into the eaves and the doors to the storage in the eaves begins to rattle. Lots of investigations have been done, sealing up of pipes connecting to roof vents redone etc.. Nothing has worked. The builder’s theory is again the vacuum caused by the DCV even though the DCV is not on that floor. Is that possible or likely?

    Anybody with experience installing and troubleshooting in modern extensions with DCVs I’d love to hear from you. Thanks.



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    #2
    mickdw
    Registered Users Posts: 23,368 ✭✭✭✭mickdw


    Are these toilets on floors above each other flowing into same stack? Or both on same level flowing into same stack.

    Waste from one toilet showing up in other toilet?

    Soil stack vented at top I presume?



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    #3
    MicktheMan
    Registered Users Posts: 2,837 ✭✭✭MicktheMan


    In my experience, DCV has nothing to do with your toilet issue.



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    #4
    Tefral
    Registered Users Posts: 4,358 ✭✭✭Tefral


    https://www.boards.ie/discussion/comment/121890806#Comment_121890806

    Agreed.

    Couldnt be, there just isnt enough air being drawn in to the vents to create suction of that level.

    It surely would be simple to test anyway, just turn off the Fans in the attic spaces and see what happens, id wager my house its not the issue though.



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    #5
    listermint
    Registered Users Posts: 33,979 ✭✭✭✭listermint


    Sounds like a waste problem any pictures of the soil stack ?



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