Hi is it possible to have a bathroom connected to a soil stack on the first floor of a property with an air admitance valve instead of it venting through the roof ?
soil stack
- Thread starter tommyl18
- Start date
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If the other stack is being ventilated elsewhere then you can go ahead. 
there isnt another stack just one old cast iron stack that runs straight through the middle of the wall of the bathroom it looks ****e and leaks like a good en.
wanted to chop it further down fit a plastic soil stack onto the cast iron with a rubber coupler. Then cap it with an admittance valve, use anti vac traps on the basin and bath.
I know you cant go any higher than 2metres with a soil stack if it is capped but thought this was for a stubby stack with no admitance valve.
wanted to chop it further down fit a plastic soil stack onto the cast iron with a rubber coupler. Then cap it with an admittance valve, use anti vac traps on the basin and bath.
I know you cant go any higher than 2metres with a soil stack if it is capped but thought this was for a stubby stack with no admitance valve.
Need to keep an open vent to allow the drains to breathe. Building regs allow for an AAV to be used providing there is at least one ventilated stack on the drain run. Anti vac traps will do the same job as an AAV, letting air into the system, but as with an AAV, wont allow positive pressure in the system to escape.
If you were planning on fitting the AAV outside it needs to be an external type, and the cost of those is about equivalent to another length of pipe and a couple on bends at the top to form a vent.....
If you were planning on fitting the AAV outside it needs to be an external type, and the cost of those is about equivalent to another length of pipe and a couple on bends at the top to form a vent.....
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The house is a terraced house in a row of 5 houses and the other houses are all vented and it will all be on the same pipe run so would that make any difference
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