Hi all, I have recently moved into a victorian flat, it is a 3 storey building with the bottom floor being a basement. My bathroom setup is that I have a sink which discharges into a run of 42mm pipe, I have a bath which tee's into this run. The pipe then is unioned with a small section of lead piping which feeds into the top of a 3" cast iron stack, via a 90 degree bend. The stack runs right down to the bottom of the property with the floor below tied into it. There is a separate 4" stack that sits beside it where the toilet discharges.
The 4" stack continues up through the roof to an open vent, but the 3" stack is not vented at all.
My problem is that when I run the sink I get gurgling noises from the bath trap. I have places a thin piece of paper over it and it looks like it is a positive pressure problem. I am assuming this is because there is no vent, and the sink when run is filling the pipe causing a pressure increase in the pipe. Given the bath has a shallow trap it wont take much increase in pressure to blow the excessive pressure through the water seal.
If I am right, I was going to run a vent line which would tee into the line after the bath and sink tie in's but before it runs into the vertical stack. This would run up through the wall into the loft and through the roof. Is there a minimum of vent size, i.e. would a 1/2" hose suffice or does it need to be 32mm/40mm. If I could get away with a hose it would save me having to rip apart wall etc.
Appreciate any advice guys.
Thanks,
The 4" stack continues up through the roof to an open vent, but the 3" stack is not vented at all.
My problem is that when I run the sink I get gurgling noises from the bath trap. I have places a thin piece of paper over it and it looks like it is a positive pressure problem. I am assuming this is because there is no vent, and the sink when run is filling the pipe causing a pressure increase in the pipe. Given the bath has a shallow trap it wont take much increase in pressure to blow the excessive pressure through the water seal.
If I am right, I was going to run a vent line which would tee into the line after the bath and sink tie in's but before it runs into the vertical stack. This would run up through the wall into the loft and through the roof. Is there a minimum of vent size, i.e. would a 1/2" hose suffice or does it need to be 32mm/40mm. If I could get away with a hose it would save me having to rip apart wall etc.
Appreciate any advice guys.
Thanks,