in my upstairs bathroom the wc is connected to a vertical stack which is inside the property but boxed in (the stack does not vent to the outside of the house) the wc connects to this by a bend which has a vertical stub into which is fitted a small air admittance valve (1 1/2"), which has a horizontal slot through it and has what seems to be a clicking valve inside when you shake it
i put a lighted candle beside the valve and flushed the wc, during the process of the water running down the stack there was no movement in the candle flame.
when the cistern was empty and starting to fill the flame then was sucked towards the air admittance slot
is this normal
when flushing the toilet the bath outlet gurgles and eventually i think the trap empties as i can smell faint sewage odours coming out of the overflow part of the bath plumbing and the waste hole
i suspect the bath is plumbed into the stack and it is sucking the water from the trap when flushing the toilet. i thought the air admittance valve would have catered for this, in any event.
the property was built in 2006
any advice greatfully received
cheers
geoff
i put a lighted candle beside the valve and flushed the wc, during the process of the water running down the stack there was no movement in the candle flame.
when the cistern was empty and starting to fill the flame then was sucked towards the air admittance slot
is this normal
when flushing the toilet the bath outlet gurgles and eventually i think the trap empties as i can smell faint sewage odours coming out of the overflow part of the bath plumbing and the waste hole
i suspect the bath is plumbed into the stack and it is sucking the water from the trap when flushing the toilet. i thought the air admittance valve would have catered for this, in any event.
the property was built in 2006
any advice greatfully received
cheers
geoff