5 in connection 450mm inspection chamber configuration

[lu1]

By who ?

To Building Control e.g. connecting to main sewer for ground floor toilet

 

[lu1]

Is there any scope to run drainage along the Left Hand side of the Building?

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..

 

[Hugh Jaleak]

2.4m is quite wide, I don't see an issue with running a drain through there, provided the existing Foundations aren't undermined.

 

[foxhole]

To Building Control e.g. connecting to main sewer for ground floor toilet

My basin and shower waste connect directly into soil pipe adjacent the toilet , not an issue for BC.

 

[lu1]

My basin and shower waste connect directly into soil pipe adjacent the toilet , not an issue for BC.

Ah, above interior floor level?

I'd like to go straight down through the floor to avoid clutter, if possible.

Edit: ther's a stub stack in the design for the internal bathroom but not the ensuite

 

[lu1]

2.4m is quite wide, I don't see an issue with running a drain through there, provided the existing Foundations aren't undermined.

Do you imagine an overriding improvement (e.g. dismissing extension/garage alleyway foul complications & garage floor storm I.C. complications) by redesign and trying to send everything down the left, or something more subtle perhaps?

 

[Hugh Jaleak]

You need to keep things as simple as possible. The further and more complicated route the sewage has to take, the more chance of a problem in the future, in the current design you've got it running round 3 sides of the property.

I'd be looking to bring the Kitchen drainage down the Left side, and it can run parallel with the surface water across the front to pick up the sewer as it leaves the property.

Bathroom Stub Stack in the middle of the build, take that to the right at 90° and join into the run on the right hand side where it meets. Bend can be used to achieve required angle. En Suite, I'd be looking to connect Basin either into the WC drain, or drop the basin and shower into a Bottle Gully immediately outside the property.

Then decide if you really need 110mm Drainage for the Hot Tub, if you don't, then it cuts out all that pipework going to and behind the rear of the build. Air Con drainage could then go into the Rainwater, it's clean water.

 

[lu1]

That all sounds eminently sensible and deserving of a deep dive - I had expected nothing less from you when I decided to post on the topic. All that and the resident particle physicist's had a bit of a laugh too. What's not to like

Thanks again.

 

[noseall]

That all sounds eminently sensible and deserving of a deep dive - I had expected nothing less from you when I decided to post on the topic. All that and the resident particle physicist's had a bit of a laugh too. What's not to like

Thanks again.

A lot of issues with some of those complex runs is the fact that (height position wise), the pipes could clash with each other.

 

[lu1]

A lot of issues with some of those complex runs is the fact that (height position wise), the pipes could clash with each other.

The fall calculation and positioning of the various elements was actually undertaken exactly so as a clash never occurs (i.e. the whole thing "fits"). There are some close shaves though with foul obvert below to storm invert above down to 50mm (or less) in places. I've no idea if BC would approve such, all dimensions (including crossing gaps) will be in the submitted plan.

Will be working on an update but the garden hot tub drain is definitely toast. There are still some small crossing point gaps possible in the multi-slope driveway

 

[noseall]

The fall calculation and positioning of the various elements was actually undertaken exactly so as a clash never occurs (i.e. the whole thing "fits").

Precision doesn't work like that in the ground. Plus there might be other objects in the ground that could influence the height of the pipes.

 

[lu1]

Precision doesn't work like that in the ground.

2 metres at 1/40th to close that 50mm gap gives me a fair bit of hope.

I've shifted about 150 tons around (shovel/wheelbarrow) in the back garden so think I already know it pretty well ... groundstation for setting out and Optical Level with tripod/staff, with care, I think i'll be accurate enough.

It is a big job though and with very little previous groundwork there are nerves.

I also need to be very accurate with the new founds / footings due to the required low oversite level so will build them myself too (maybe get labour in to do the above ground blocks).

It's an interesting project until it isn't but will have enjoyed learning to handle a mini digger anyway.

We'll see.