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Hoping some of the plumbers on here might be able to answer this problem. Started working on a new extension to a house. The original soil stack is remaining but will end up interfering with the new roof. Question is can the stack have an AAV fitted and terminate in the new roof space or does it have to be open to atmosphere. One point to note is the house in question is the last house on the main drain/ sewer pipework.
Lee
Lee