Planning a small installation with Part H to hand, (building control app'n is granted) and just want some confirmation here that I'm getting this right for building control. The drainage is the only main inspection BC need to make (Since I'm part P electrician).
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WC, low level shower, basin, 1970's uninsulated concrete ground floor.
Existing manhole (approx 1M invert), will be accessed with a new 110mm pipe dug through the wall/foundation. Existing manhole is about 2.5 M away from the proposed vertical WC outlet
I want to keep this as simple as possible, ideally without boxing for pipes, - but it seems to me that I really can't escape the need for a ventilated stack with a durgo alongside the WC.
Bear with me. I envisage a stack (to be boxed in) with 100mm durgo on top (stack height is TBD). Branch 100 mm waste to WC (~ 500mm long) just above floor level, and somewhat further up same stack (>=200mm offset) would be 32mm waste from basin, to be run along the wall.
The low level shower tray means a 40mm waste (from 90 dia low profile trap) and this must be dug into the floor (ie displacing screed and potentially also some concrete, & if I find the DPM between the two that's to be dealt with)
The 40mm shower must branch into the stack below the floor level. I'm thinking the only way to do this is (diagram 2 in part H) to use a 50mm parallel junction alongside the stack, to get the joint 200mm below the wc waste).
I'd make all inaccessible joints in solvent weld and test before back filling.
Am I on the right lines here, and if so how high must the 110mm stack go alongside the WC? (Will be boxed in alongside the WC, with durgo atop).
(I'm sure the aesthetic would be much nicer if I can make all drainage disappear like magic into the floor, but I can't see any way to achieve that. )
.
WC, low level shower, basin, 1970's uninsulated concrete ground floor.
Existing manhole (approx 1M invert), will be accessed with a new 110mm pipe dug through the wall/foundation. Existing manhole is about 2.5 M away from the proposed vertical WC outlet
I want to keep this as simple as possible, ideally without boxing for pipes, - but it seems to me that I really can't escape the need for a ventilated stack with a durgo alongside the WC.
Bear with me. I envisage a stack (to be boxed in) with 100mm durgo on top (stack height is TBD). Branch 100 mm waste to WC (~ 500mm long) just above floor level, and somewhat further up same stack (>=200mm offset) would be 32mm waste from basin, to be run along the wall.
The low level shower tray means a 40mm waste (from 90 dia low profile trap) and this must be dug into the floor (ie displacing screed and potentially also some concrete, & if I find the DPM between the two that's to be dealt with)
The 40mm shower must branch into the stack below the floor level. I'm thinking the only way to do this is (diagram 2 in part H) to use a 50mm parallel junction alongside the stack, to get the joint 200mm below the wc waste).
I'd make all inaccessible joints in solvent weld and test before back filling.
Am I on the right lines here, and if so how high must the 110mm stack go alongside the WC? (Will be boxed in alongside the WC, with durgo atop).
(I'm sure the aesthetic would be much nicer if I can make all drainage disappear like magic into the floor, but I can't see any way to achieve that. )