Venting pipe in domestic water system.


Postby grakar » Tue Sep 23, 2008 4:09 pm

A pipe rises from the waste water pipe from our bathroom sink and goes through the roof I assume for venting purposes. This pipe encroaches on space I need for a vanity unit and I wonder if it can be removed. As I understand it no smell can come up through the sink as there will be a trap fitted. What please is the function of this pipe and can it be removed?
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Postby jim the plumb » Tue Sep 30, 2008 7:53 pm

You are probably talking about the 4inch soil pipe that extends through the roof to the open air. This pipe vents smells from the toilet/ waste drains to open air.

You can fit a 'durgo', or 'air admittance valve' by cutting down this 4inch pipe, but the valve must remain higher than the highest waste in the bathroom. i.e. the basin.

HTH, jim
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Postby grakar » Wed Oct 01, 2008 8:12 am

Thanks Jim for your reply.
The waste water from the basin in addition to venting through the roof is piped to a rainwater down pipe. This pipe is open to the rainwater gutters on the roof. Do I need further venting? The soil pipe from the WC is fed to a separate downpipe.
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