5 in connection 450mm inspection chamber configuration
- Thread starter lu1
- Start date
The distance between the existing left wall of my bungalow and neighbour's is approx 2.4m Any drains that might go down that alley would be closer to my wall found than 1 metre. With very shallow foundations it's probably not a great area for drain runs and involve lots of concrete fill.
The following may also be relevant - some local BC technical advice is attached.
While the patio to the right and rear of the extension are both 125mm above oversite concrete level i'm (tentatively) assuming a single land drain to the rear (as per the plan) will suffice.
I plan to reduce FGL to the left hand side of the extension by 300mm from patio FGL (i.e. two steps). It will then be 175mm below the extension oversite concrete.
The extension (interior) is 4250mm front-to-back. Sloping each half of the concrete oversite top face downward by about 50mm (approx 1/80) to a central channel and providing drainage by way of a 40mm drain pipe through the left wall seems it might have a chance of approval.
Left side FGL rises to rear patio FGL again at the line of the rear of the existing bungalow but I will keep a 300mm wide channel on my side of the boundaty at 300mm less than rear patio FGL until that interfaces with natural ground level some way to the front of the alley on the sloping site..
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2.4m is quite wide, I don't see an issue with running a drain through there, provided the existing Foundations aren't undermined.
Ah, above interior floor level?
I'd like to go straight down through the floor to avoid clutter, if possible.
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