Six months ago i re-did our main bathroom, moved the bath, sink and toilet and re-plumbed to the main soil stack, see image. Was all working fine until recently.
The sink continues to always drain no problems, but the bath now drains slow as does the toilet. Occasionally when the toilet is flushed the bath trap gurgles.
When flushed, the toilet always goes down after 20 seconds or so, flushing multiple times does the same thing, back-up but then drains slow-ish.
Lifted the inspection hatch in the garden and i see no blockages at all. Whilst watching this pipe, when the bath is drained and/or the toilet flushes they both drain normally (not slow).
If I turn on the sink tap and then turn on the bath, it seems to drain ok, i turn off the sink and the bath continues to drain ok. Wondering if its something to do with the fact that i have activated the small air admittance valve fitted to the sink trap?
Sink, bath and toilet wastes all have recommended slope applied into the soil stack. House built in 2006, soil stack air admittance valve is the original unit. I seem to recall some years ago being able to unscrew the very top of it and i cleaned the bits i could disassemble. The previous bathroom layout would occasionally gargle the bath and shower traps when the toilet was flushed so thought the AAV was playing up back then too..
Am i right in thinking the air admittance valve at the top of the stack is the most likely cause?
It's solvent welded to the top of the stack, right in the corner of the loft which has lots of crap in the way to get to. Any ideas on how to slice the valve off in a confined area? I dont have a picture of it but might be able to get one at the weekend and see i i can buy another and transplant the internals over?
The sink continues to always drain no problems, but the bath now drains slow as does the toilet. Occasionally when the toilet is flushed the bath trap gurgles.
When flushed, the toilet always goes down after 20 seconds or so, flushing multiple times does the same thing, back-up but then drains slow-ish.
Lifted the inspection hatch in the garden and i see no blockages at all. Whilst watching this pipe, when the bath is drained and/or the toilet flushes they both drain normally (not slow).
If I turn on the sink tap and then turn on the bath, it seems to drain ok, i turn off the sink and the bath continues to drain ok. Wondering if its something to do with the fact that i have activated the small air admittance valve fitted to the sink trap?
Sink, bath and toilet wastes all have recommended slope applied into the soil stack. House built in 2006, soil stack air admittance valve is the original unit. I seem to recall some years ago being able to unscrew the very top of it and i cleaned the bits i could disassemble. The previous bathroom layout would occasionally gargle the bath and shower traps when the toilet was flushed so thought the AAV was playing up back then too..
Am i right in thinking the air admittance valve at the top of the stack is the most likely cause?
It's solvent welded to the top of the stack, right in the corner of the loft which has lots of crap in the way to get to. Any ideas on how to slice the valve off in a confined area? I dont have a picture of it but might be able to get one at the weekend and see i i can buy another and transplant the internals over?
