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Hi thanks for your reply. I’m not sure I can get an outside vent pipe due to it being a dorma and that there is a velux window to the right of the proposed vent pipe. Can the vent pipe be reduced in size then follow the pitch of the roof and vent on the other side of the roof. if I use an aav...

I’m looking at the possibility of moving a internal soil pipe outside. The soil pipe services an en-suite upstairs wc, shower and basin. Downstairs it services a shower which I intend to remove. The existing pipe runs down the middle of the house and out to an inspection chamber which is...