Moving Manhole Cover for Extension

[Deal87]

Hi All,

This is my first post so go easy! I have used this site a lot in the past and it has always been very useful. So useful I have always found the answer I needed and haven't needed to sign up! But my current question is a little more complicated and I would like some guidance before I go any further...

I am looking at purchasing a new property and my plan is to add a single storey 3m extension on building regs. However there is currently a drain in the way of where the foundations need to go. See pics for a better explanation.

I have quite a few questions but I will start with the most obvious ones first.

Does my plan to move the Manhole cover further along the predicted exit pipe look feasible?

Under the manhole cover there are 3 pipes one from toilet upstairs in the house, one from outside toilet (needs clearing) and one pipe taking the sewage away- from the angle it looks like it runs under the garage to the road at the front.

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• Deal87
• 26 Aug 2014
• 1

Untitled

• Deal87
• 26 Aug 2014
• 1

Untitled

• Deal87
• 26 Aug 2014
• 1

Untitled

• Deal87
• 26 Aug 2014
• 1

I have a couple of other questions regarding the rainwater pipe relocation but for now please let me know if my initial (very rough) plans look feasible.

Thanks

 

[ree]

What you show is very common in extensions - all waste and drainage can, typically, be moved around to suit your proposals.

However, there's no way near enough info on your sketch - all drainage points and runs must be taken into account before any realistic comment can be made.

 

[Nige F]

The manhole depth is in your favour . As long as the WC in the bathroom can turn so that the soil/vent pipe can be moved round the corner - the basin + bath wastes will need to go into it too - maybe a bathroom refurb Looks lie the new plastic soil will have to penetrate the garage roof - again no big deal.

 

[Deal87]

That all sounds very reasonable to me. I had factored in moving the WC and pipework in the upstairs bathroom- although I didnt explain it in my first post.

I figured another option is to run the pipe inside the house and box it in when refitting the kitchen and bathroom, that way I can run the soil pipe through the wall in the garage out to the relocated manhole junction. This would save cutting through the garage roof. But I would have to run a vent pipe through the attic. Both require some effort so either option would work I guess.

So I think I am pretty clear on where the sewage water goes now. Would the storm water run to a soak away? Or a separate storm water pipe? Or into the same pipe as the sewage water? As my next focus is a plan to relocate the storm water pipe.

Thanks again

 

[Deal87]

After some more research I have found some useful guides that I plan to follow. I though I should post them on here for points to discuss and it may help others with similar questions.

Relocating manhole cover installation: http://www.free-instruction-manuals.com/pdf/pa_458147.pdf

Similar post with good points made: //www.diynot.com/forums/building/soil-pipe-relocation-and-connection-advice-please.329788/

The questions regarding the storm water still stand though?

Thanks

 

[Nige F]

Your local council should have plans for drainage that you can view - otherwise i`ts a dig and figure out job. As to the roof penetration ,I missed the corrugated roof covering An idea would be a long ,say 2 foot flashing behind the soil on the roof corrugations /up the wall then flattening out behind the pipe to shed the water - shorter at the front , and stuck to the corrugated material @ the back . disc cut groove in the wall and a cover flashing . Good thing is it can be done as the soil pipe is being fitted.