Tapping into clay drain pipe

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ragj195

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Hi

I'm building a side garage and need to move the downpipes and drain in the picture about 1m to the right. The large downpipe is rainwater and the small one is the kitchen sink. The above ground part is straight forward. Below ground it drains into the old clay pipes. As it's so close I also want to drain the new garage roof into it. Is it best to cut a section out of the clay pipe and convert it to pvc using those rubber adaptors? What fitting would I install in the PVC section so that it can take two 110mm feeds?
 

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Building control don't tend to accept new rainwater roof drainage going into existing drains, unless a soakaway is not feasible.
 
As long as the pipes are not unfeasibly deep then grafting in a mini access chamber is fairly straightforward.
You need to remember to remove enough of the existing pipe as to allow room for the chamber plus two short lengths of plastic (250mm ish) as these two short bits of plastic pipe will need to fully accommodate the length of the Fernco couplers as you lower the chamber into place. You just slide them onto the clay once in position.

Yours will be a wee bit trickier because you need to deal with multi inlets. Just make sure you cut any pipes back far enough to allow for bends etc and that you locate the chamber in the optimum position allowing everything to flow downstream.
 
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noseall said:
Correct. Extremely reluctant I'd call it.
Click to expand...
Oddly they accepted it without comment on our extension, the roof area increased over 25%and no questions asked. Further more, 2/3 the original drainage went into the surface water drains at the front, only the back one goes into the sewer.

So your mileage may vary (or they may know soak aways don't work on clay)
 
noseall said:
As long as the pipes are not unfeasibly deep then grafting in a mini access chamber is fairly straightforward.
You need to remember to remove enough of the existing pipe as to allow room for the chamber plus two short lengths of plastic (250mm ish) as these two short bits of plastic pipe will need to fully accommodate the length of the Fernco couplers as you lower the chamber into place. You just slide them onto the clay once in position.

Yours will be a wee bit trickier because you need to deal with multi inlets. Just make sure you cut any pipes back far enough to allow for bends etc and that you locate the chamber in the optimum position allowing everything to flow downstream.
Click to expand...

Is there any way of doing it within having to have an access chamber cover on the drive? I'd rather keep it concealed.
 
I don't want to have access to it. Someone suggested an inspection chamber. Is there a way to do it without having to use an inspection chamber. Basically something similar in terms of inlets etc but designed to be buried.
 
You could build it too low and cover it. That way it would be hidden but there would still be future access. Loads of manholes get covered over in time, but it helps if you know roughly where they are.
 
Building control wouldn't accept a hidden cover if it was necessary to access the drains. However if you make sure all runs to that job are roddable from elsewhere then it would be fine.
Or you could remove it after it's inspected and hope it never blocks.
 
noseall said:
You want a secret chamber? Pourqui?
Click to expand...
Hi

I don't want a chamber. Just need to tap into a clay pipe a couple of ft down so that I can feed existing rainwater downpipe from house into it and another rainwater feed from a new garage
 
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