chris_d
Established Member
Lets play 'spot the self-builder' again....
I am led to believe that brown PVC soil/drainage pipe has chemical stabilizers to prevent it being attacked by acid in the soil/earth and that grey/black soil pipe has UV stabilizers to protect it from sunlight. Therefore, I believe that brown should be used below ground and grey/black above.
Now, here is my dilemma: What should I use in the 150mm air gap (void) beneath a suspended concrete ground floor? In my case, the ground beneath the void is exposed earth.
For plumbing convenience, I'd like to use grey pipework as the wider range of fittings makes it easier to achieve the interconnect I require but I'm worried that the BCO will demand to have brown pipework given that it will sit just a few inches above earth that could heave and hence come in contact with it.
I was proposing to use 110mm brown pipework from the external manhole through the foundation wall and just into the void then changing to a 110mm grey trunk pipe run from which there will be:
- two separate 50mm T-junctions to the kitchen sink and dishwasher;
- a 110mm/50mm multi-junction to a toilet and shower tray/basin;
- final 90 degree bend up to a roding access point and then a stack pipe to the first floor bathroom.
My preference to use grey pipework is based on the convenience offered by the 50mm junctions for the sinks, dishwasher and shower; I'm not aware of the availability of 50mm brown pipework or junctions.
So what does the collective experience of UKW suggest? Should I either:
1. proceed as discussed above;
2. or use 110mm brown pipework throughout and just live with the inconvenience and expense of running 110mm pipe everywhere including the extra junctions this entails.
The BCO will be inspecting whatever I do on Monday.
Thanks,
Chris
I am led to believe that brown PVC soil/drainage pipe has chemical stabilizers to prevent it being attacked by acid in the soil/earth and that grey/black soil pipe has UV stabilizers to protect it from sunlight. Therefore, I believe that brown should be used below ground and grey/black above.
Now, here is my dilemma: What should I use in the 150mm air gap (void) beneath a suspended concrete ground floor? In my case, the ground beneath the void is exposed earth.
For plumbing convenience, I'd like to use grey pipework as the wider range of fittings makes it easier to achieve the interconnect I require but I'm worried that the BCO will demand to have brown pipework given that it will sit just a few inches above earth that could heave and hence come in contact with it.
I was proposing to use 110mm brown pipework from the external manhole through the foundation wall and just into the void then changing to a 110mm grey trunk pipe run from which there will be:
- two separate 50mm T-junctions to the kitchen sink and dishwasher;
- a 110mm/50mm multi-junction to a toilet and shower tray/basin;
- final 90 degree bend up to a roding access point and then a stack pipe to the first floor bathroom.
My preference to use grey pipework is based on the convenience offered by the 50mm junctions for the sinks, dishwasher and shower; I'm not aware of the availability of 50mm brown pipework or junctions.
So what does the collective experience of UKW suggest? Should I either:
1. proceed as discussed above;
2. or use 110mm brown pipework throughout and just live with the inconvenience and expense of running 110mm pipe everywhere including the extra junctions this entails.
The BCO will be inspecting whatever I do on Monday.
Thanks,
Chris