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Plumbing

Can I replace an external vent pipe with an internal air admittance valve

Anonymous user 03/03/2024 - 2.39 PM

I currently have a cast iron vent pipe serving an inspection chamber which passes through the house to vent through the roof. It is very solid and all the joints are lead solder The house has been considerably extended. Currently the same inspection chamber serves two bathrooms, one upstairs and one down, with fitted air admittance valves at the end of each line. Rain can get in through the old roof vent area and work needs to be done and the area if clear would make an ideal site for solar panels. It is the flashing not the pipe that is at fault. Can an internal air admittance valve be installed instead of the exit through the roof. If not possible to replace with an air admittance valve, could I put in a new vent pipe in plastic which instead of passing through the house, would go to our garage and be placed on the inside or outside of that. The garage is about 3 metres from the inspection chamber. Graham Martin

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2 Answers

clydebank plumbing and heating

Rating: 5 out of 5
Ashton Under Lyne
you should really have the stack vented to air!also A.A.VS need to be got at in case they fail,which can happen.then you will end up with trapseal loss,which i am sorry to say will leave your home smelling badly.hope this heps,tommy clydebank p&h,PSall a.a.vs etc need to be above the highest spillover level of any sanitary ware.
Answered7 September 2011
2

PTP Plumbing and Heating LTD

Rating: 4.9 out of 5
Dunmow
Morning Graham, if you only have one vent pipe connected to the sewer system then it is not advisable to put in an air admitance valve. If its a grade 2 listed building then i don't think u would be able to put plastic out of the roof. As for rerouting the vent pipe, that should be fine as long as you use the correct clamp to join plastic to cast iron and that the pipe vents into open air. I hope this has helped. Phil
Answered7 September 2011
1