Connected to the existing pipe and then discovered that the pipe leads into the loft space above and stops there. The loft space is cold and the pipe was full of condensate.
So need to do something to stop all that humid air filling the loft void. What I really need is something that will condense out the moisture so that it can be routed down the soil stack. But while that might work in the middle of winter it is going to need something else in the summer when the moist air will escape before it condenses.
Because it is a flat I probably need to get the freeholders permission to go out through the roof or soffit and it will mean working three floors up so would rather avoid that option.
I guess a dehumidifier in the bathroom is one option (or even in the loft? ) but is there anything else I could be considering.
I have no idea what they do in the flat below which doesn't even have access to the loft.