My parents have a leak in their kitchen ceiling that only occurs after the bathroom toilet has been flushed and the leak is directly below where the toilet is situated. The bathroom is located on the first floor and the kitchen (extended 30 years ago) extends out as a single storey from below the bathroom external wall (hope that makes sense).
The bathroom has a low level WC pan and cistern. The pan discharges into a horizontal 110mm plastic soil pipe which passes through the wall. However, the pipe exiting the otherside of the wall (just above the lead flashing of the kitchen extension flat roof) is an old lead soil pipe that runs down at approx 45 degrees into a cast iron stack.
I assume the leak is coming from the joint between the plastic and lead soil pipes but the joint is inside the wall and neither visible or accessible internally or externally. The internal wall is a finished tiled wall and the external wall (where the lead soil pipe exits) is also a finished wall.
Can anyone please suggest how we go about accessing and fixing the leak. Thank you.
The bathroom has a low level WC pan and cistern. The pan discharges into a horizontal 110mm plastic soil pipe which passes through the wall. However, the pipe exiting the otherside of the wall (just above the lead flashing of the kitchen extension flat roof) is an old lead soil pipe that runs down at approx 45 degrees into a cast iron stack.
I assume the leak is coming from the joint between the plastic and lead soil pipes but the joint is inside the wall and neither visible or accessible internally or externally. The internal wall is a finished tiled wall and the external wall (where the lead soil pipe exits) is also a finished wall.
Can anyone please suggest how we go about accessing and fixing the leak. Thank you.