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thanks, the original is vented and no, the soil pipes don't join. my husband has just spoken to a friend with knowledge of the subject and he believes that there is an aav at the top of the new soil pipe. If this is the case then it is enclosed in a tiled "box" next to the sink. The top of...

thanks vinny. No the old bathroom has its own soil pipe

have v little knowledge of this topic. Had a new extension with new bathroom and utility room with waste going into newly constructed drain. Had v bad smells in house when neighbour's drain was blocked, have now realised that soil pipe was not vented through roof - is this an absolute...