M
mfripp
We live in a second floor flat, with one more floor above ours. Our kitchen sink drains into a 40mm PVC pipe that goes directly to a soil stack about 1.5 meters away. In our flat, the kitchen sink is the only drain connected to this soil stack (there's a separate one for the bathroom). However, I don't know whether there's a kitchen or bathroom connected to this soil stack in the flat above ours.
Our problem is that we sometimes get a glugging noise and wastewater splashing up from the kitchen sink trap into the sink. It's disconcerting, and occasionally accompanied by a bad smell. I imagine it may be due to poor venting of the soil stack, causing positive pressure when water rushes down from the flat above, but I haven't investigated that.
For now, I'm looking for solutions to this problem that I can implement within our flat. I am also looking for a way to connect a dishwasher into this system, and to maintain as much space under the sink as possible, for sliding rubbish bins.
I've bought a HepVO trap and installed it horizontally immediately under the sink. This has stopped the glugging, and keeps the drain pipe nicely close to the bottom of the sink. Unfortunately, in the horizontal position it doesn't seem to drain quite as fast as I'd like (although it's tolerable), and a little bit of smelly water may be remaining upstream of the trap (possibly when soapsuds are the last thing down, and they hold the trap open a bit for smells to come back up?). These aren't big problems, but they've gotten me thinking the HepVO might perform better if it were mounted vertically on the back wall instead of horizontally under the sink. Does that sound like a good idea? Or would that leave too much horizontal pipework before the trap (e.g. could food and wastewater get smelly in the pipes between the sink and the trap -- 30 cm horizontal and 15 cm vertical)?
The second question is, what's the best way to add a dishwasher waste into this setup? I could add an appliance adapter (like this: Appliance Trap Adaptor 40mm - NoLinkingToThis, Where the Trade Buys ) below the sink, but that would push all the pipes down further than I want. On the other hand, if I move the HepVO to the back wall, I could put a T above it and send both the dishwasher and sink waste down through it.
Alternatively, I could add a separate appliance upstand and trap for the dishwasher, but I'm worried that the occasional positive pressure could be a problem (maybe less so with the 30 cm upstand), or that the trap could empty if we don't run the dishwasher for a while and/or water gets siphoned down the soil stack.
Any suggestions on the best way ahead?
Our problem is that we sometimes get a glugging noise and wastewater splashing up from the kitchen sink trap into the sink. It's disconcerting, and occasionally accompanied by a bad smell. I imagine it may be due to poor venting of the soil stack, causing positive pressure when water rushes down from the flat above, but I haven't investigated that.
For now, I'm looking for solutions to this problem that I can implement within our flat. I am also looking for a way to connect a dishwasher into this system, and to maintain as much space under the sink as possible, for sliding rubbish bins.
I've bought a HepVO trap and installed it horizontally immediately under the sink. This has stopped the glugging, and keeps the drain pipe nicely close to the bottom of the sink. Unfortunately, in the horizontal position it doesn't seem to drain quite as fast as I'd like (although it's tolerable), and a little bit of smelly water may be remaining upstream of the trap (possibly when soapsuds are the last thing down, and they hold the trap open a bit for smells to come back up?). These aren't big problems, but they've gotten me thinking the HepVO might perform better if it were mounted vertically on the back wall instead of horizontally under the sink. Does that sound like a good idea? Or would that leave too much horizontal pipework before the trap (e.g. could food and wastewater get smelly in the pipes between the sink and the trap -- 30 cm horizontal and 15 cm vertical)?
The second question is, what's the best way to add a dishwasher waste into this setup? I could add an appliance adapter (like this: Appliance Trap Adaptor 40mm - NoLinkingToThis, Where the Trade Buys ) below the sink, but that would push all the pipes down further than I want. On the other hand, if I move the HepVO to the back wall, I could put a T above it and send both the dishwasher and sink waste down through it.
Alternatively, I could add a separate appliance upstand and trap for the dishwasher, but I'm worried that the occasional positive pressure could be a problem (maybe less so with the 30 cm upstand), or that the trap could empty if we don't run the dishwasher for a while and/or water gets siphoned down the soil stack.
Any suggestions on the best way ahead?