Post by DIYDafty on Apr 5, 2019 22:34:15 GMT
Hello all
Trying to convert a 1st floor room above the detached garage into a bedsit with kitchen so I don't have to hear the mother in law when she turns up. Finding it very hard to understand the building regs Part H.
If say you had a kitchen sink, dishwasher, washing machine and shower all in a row all discharging into a 40 or 50 mili branch pipe then maybe that's ok. BUT what if that pipe was 9M long ! ?
There is a table in the regs that basically says if using 50mm pipe then you can have up to 4M of pipe but it also says if you want longer then you need to think about ventilation the pipe (I think) to prevent one appliance sucking the trap out of another one. There's also talk of durgo valves but there is nothing about anti-syphon traps.
"Branch ventilation pipes" seem like another solution but you need one within 750mm of any trap. Or is that only downstream? Maybe if you vented your 50mm branch pipe at the top that would be allowed?
So without boring you all with the exact layout, if you had 9M of waste pipe with a few appliances what is the best way of comforming to the regs? And why don't the regs mention anti-sypon traps - maybe they could be considered like having a ventilated branch pipe about zero mm away from the trap? Maybe a single Durgo or external 50mm ventilation pipe at the TOP of the run would be ok?
As ever any thoughts gratefuly received. Oh, and I'd be scared to death of putting in a new stack and connecting it to the shared sewer below so hope I don't have to do that!
Trying to convert a 1st floor room above the detached garage into a bedsit with kitchen so I don't have to hear the mother in law when she turns up. Finding it very hard to understand the building regs Part H.
If say you had a kitchen sink, dishwasher, washing machine and shower all in a row all discharging into a 40 or 50 mili branch pipe then maybe that's ok. BUT what if that pipe was 9M long ! ?
There is a table in the regs that basically says if using 50mm pipe then you can have up to 4M of pipe but it also says if you want longer then you need to think about ventilation the pipe (I think) to prevent one appliance sucking the trap out of another one. There's also talk of durgo valves but there is nothing about anti-syphon traps.
"Branch ventilation pipes" seem like another solution but you need one within 750mm of any trap. Or is that only downstream? Maybe if you vented your 50mm branch pipe at the top that would be allowed?
So without boring you all with the exact layout, if you had 9M of waste pipe with a few appliances what is the best way of comforming to the regs? And why don't the regs mention anti-sypon traps - maybe they could be considered like having a ventilated branch pipe about zero mm away from the trap? Maybe a single Durgo or external 50mm ventilation pipe at the TOP of the run would be ok?
As ever any thoughts gratefuly received. Oh, and I'd be scared to death of putting in a new stack and connecting it to the shared sewer below so hope I don't have to do that!
