We have a problem with the drains..........
For some reason there seems to be positive pressure in the local sewer which due to the extremely stupid bodge the previous owner carried out (Fitting an air admitance valve to the top of the soil stack at 1st floor level rather than taking it up above the roof line). Is causing foul smells to enter the house via basin & bath wastes.
I want to take the a vent pipe up to the top of the house, however, there isn't an obvious route. The favorite, would be to run it for a short distance in the cavity of the cavity wall and then out and up. However, the cavity isn't wide enough to accomodate 110mm pipe :=((
I was thinking about running some or all of the vent in some thing smaller. However, do I take this right up to the eaves, or switch to
110mm outside (if so, how to join the two?Alternatively, I may just have to open up the roof on the ground floor ext (interlocking tiles) and take the 110mm out through that.
What does the team suggest?