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I'd be grateful for some advice from any drainage gurus here!
I'm about 5 years now into building a small bungalow in the woods which is now wind and weatherproof. At the rate I am going it will probably take another 5 years to complete it - I keep getting stuck on details and this is the latest.
I've finished all the underground drainage which was signed off by building control a few years ago. The layout is shown in the attached schematic. You'll see that two 4" waste pipes have been brought into the building through the floor slab. The upstands have been cut back to finish floor level so they will be a pain to connect to but that's another story.
The plan was to connect one WC to each of these wastes and connect the wastes from sinks and baths via stub stacks. I thought I could get away with direct connections to the drain but it seems I cannot - I understand an open vent is required since I am at the head of a long branch drain.
I don't wish to fit an internal or external vent stack since both would be a real headache to install now and would really kill the overall look.
Can anyone advise whether an open vent is strictly necessary in these circumstances? If it is, then I wonder if I could provide one that vents remotely from the building? Put another way, could I just vent the last inspection chamber via one of the unused 4" inlets? I could terminate this with a ground vent or short stub stack somewhere in the woods where it really wouldn't matter if the air got a bit squiffy.
I'm sure my Building control officer would provide a definitive ruling on this but I'm afraid to ask - sometimes its easier to beg for forgiveness than it is to ask for permission!
Your advice would be much appreciated.
Thanks
Jon
I'm about 5 years now into building a small bungalow in the woods which is now wind and weatherproof. At the rate I am going it will probably take another 5 years to complete it - I keep getting stuck on details and this is the latest.
I've finished all the underground drainage which was signed off by building control a few years ago. The layout is shown in the attached schematic. You'll see that two 4" waste pipes have been brought into the building through the floor slab. The upstands have been cut back to finish floor level so they will be a pain to connect to but that's another story.
The plan was to connect one WC to each of these wastes and connect the wastes from sinks and baths via stub stacks. I thought I could get away with direct connections to the drain but it seems I cannot - I understand an open vent is required since I am at the head of a long branch drain.
I don't wish to fit an internal or external vent stack since both would be a real headache to install now and would really kill the overall look.
Can anyone advise whether an open vent is strictly necessary in these circumstances? If it is, then I wonder if I could provide one that vents remotely from the building? Put another way, could I just vent the last inspection chamber via one of the unused 4" inlets? I could terminate this with a ground vent or short stub stack somewhere in the woods where it really wouldn't matter if the air got a bit squiffy.
I'm sure my Building control officer would provide a definitive ruling on this but I'm afraid to ask - sometimes its easier to beg for forgiveness than it is to ask for permission!
Your advice would be much appreciated.
Thanks
Jon
