Hi there,
As part of my renovation, we're relocating the kitchen sink into an existing extension on the rear of the property. It will have a dishwasher next to it. Unfortunately there's no drain out the back there (there is guttering disapearing into the concrete outside, but I guess to a soakaway - though any ideas on how to investigate?).
That leaves me with a 7m-ish run to the nearest external drain. I guess I therefore need an air admittance valve (or two?). My question is where should it be? Here's a crap schematic of the proposed route. DW I guess will be connected to the sink trap as seems to be common practice (unless there's a 'proper' way since this is a new installation rather than adding a dishwasher to an existing install).
Should I have a valve at point A, B, or both, and/or at the kitchen sink trap? Regrettably I have to go under some floor but that can't be avoided. Where I've shown a vertical offset halfway along the long run is where the under-floor part emerges. I could just as easily keep it at the lower level throughout if that's better. Accommodating the required fall is no problem, even under the floor. The existing drain at the end of the run is the traditional square thing that every old house has (normally with half a dozen overflows/wastes pointing at it). Is this what's referred to as a gulley? Or an open hopper, in which case I'm technically screwed according to part H, right, cos I'm not supposed to discharge into an open hopper?
Any advice appreciated! Cheers,
Liam
As part of my renovation, we're relocating the kitchen sink into an existing extension on the rear of the property. It will have a dishwasher next to it. Unfortunately there's no drain out the back there (there is guttering disapearing into the concrete outside, but I guess to a soakaway - though any ideas on how to investigate?).
That leaves me with a 7m-ish run to the nearest external drain. I guess I therefore need an air admittance valve (or two?). My question is where should it be? Here's a crap schematic of the proposed route. DW I guess will be connected to the sink trap as seems to be common practice (unless there's a 'proper' way since this is a new installation rather than adding a dishwasher to an existing install).
Should I have a valve at point A, B, or both, and/or at the kitchen sink trap? Regrettably I have to go under some floor but that can't be avoided. Where I've shown a vertical offset halfway along the long run is where the under-floor part emerges. I could just as easily keep it at the lower level throughout if that's better. Accommodating the required fall is no problem, even under the floor. The existing drain at the end of the run is the traditional square thing that every old house has (normally with half a dozen overflows/wastes pointing at it). Is this what's referred to as a gulley? Or an open hopper, in which case I'm technically screwed according to part H, right, cos I'm not supposed to discharge into an open hopper?
Any advice appreciated! Cheers,
Liam