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https://www.askthetrades.co.uk/cgi-bin/yabb/YaBB.pl DIY Forum >> Plumbing Questions >> joining into soil stack https://www.askthetrades.co.uk/cgi-bin/yabb/YaBB.pl?num=1127732410 Message started by mjc on Sep 26^th, 2005, 12:00pm

Title: joining into soil stack
Post by mjc on Sep 26^th, 2005, 12:00pm

I am going to be putting a toilet under the stairs of the house I am renovating and am puzzling a little over the connection into the drains.

I probably need to discuss the options with the BCO but was wondering if it is possible to join it into the existing soil stack!

The hous is a Victorian terrace and the current situation is that the main sewer pipe runs along the back of the houses (ours is third in line of 6) and the only current connection into the drain (as viewed from the inspection chamber) is the main soil stack. I haven't excavated around the bottom of the stack yet but there are also an old (outside) WC connection which branches straight into the sewer pipe outside of the IC and a rainwater gullkey which does the same on the other end of the IC.

there is a diagram and photo at http://www.engelside.co.uk/toilet.htm

The original toilet is going and the wall between the kitchen and conservatory is too.

I don't particularly want to start making major changes, building new IC's if it at all possible so I was hoping that I could run a connection from under the stairs to the bottom of the soil stack.

Any views?

Cheers

Martin

Title: Re: joining into soil stack
Post by supersparky on Sep 26^th, 2005, 5:43pm

i know somone will know the answers/suggest something, but in the mean time, looking at your photo....why do you have three feet? lol

ss

Title: Re: joining into soil stack
Post by jasonB on Sep 26^th, 2005, 6:00pm

From what I can see in the pictures you may not have deep enough drains to accomodate the longer run and therefore fall of the new drain run.

Can you let us know the difference in height from floor level in the loo to Invert level (bottom of channel in manhole) and the distance from back of new WC to center of manhole, looks about 5.0m if your drawing is to scale.

Jason

Title: Re: joining into soil stack
Post by Timmo on Sep 26^th, 2005, 6:15pm

I notice from your post that your house is the third in line of 6 which all join into the same sewer. Therefore, if the distance from house number one i.e the start of main sewer is greater than that from your new toilet position to the manhole this should mean that the fall will be sufficient no?

Title: Re: joining into soil stack
Post by jasonB on Sep 26^th, 2005, 6:38pm

only if all the houses are on the same level, if the street slopes down to his house then there maynot ne nuch drop. From the pics the manhole only looks about 300mm deep but the manhole cover could have been below ground level.

Also the main sewer looks like 6" so the fall can be less than 4".

Jason

Title: Re: joining into soil stack
Post by mjc on Sep 26^th, 2005, 7:46pm

The distance from new loo position to sewer is approx 6m. The sewer is about 600mm below ground level (the floor level of the new loo will probably be a little higher).

I had a look at the regs and from what I could see the minimum fall is 18mm per m. Therefore I need to drop a minimum of 108mm.

I didn't mean that all 6 houses ran into the same manhole (if this is what you thought Timmo). What I was trying to say was that the sewer runs along the back of the 6 houses and each houses has an IC into which their soil pipes run.

And as far as having 3 legs supersparky, well just call me Jake :D

Martin

Title: Re: joining into soil stack
Post by supersparky on Sep 26^th, 2005, 7:57pm

heh heh ok jake ;)

btw, did you find out what the mystery pipe running through the manhole from a few weeks ago was?

ss

Title: Re: joining into soil stack
Post by jasonB on Sep 26^th, 2005, 8:10pm

You may just be lucky and get a tee into the stack just above the rest bend, suggest you expose the part of rhe stack below ground then get the BCO in to have a look.

Jason

Title: Re: joining into soil stack
Post by mjc on Sep 26^th, 2005, 8:58pm

wrote on Sep 26^th, 2005, 7:57pm:

heh heh ok jake ;)

btw, did you find out what the mystery pipe running through the manhole from a few weeks ago was?

ss

ss

Yes, it was the old gas supply pipe. I spoke to a neighbour and he told me that there had been a problem with gas leaks a few years ago and consequently the supply was changed to enter the from the front of the row of 6. I got a little worried when cutting the pipe and ther was a slight gassy smell, and doubly so when Transco started digging further down the road :-[ I also found the old lead water supply pipe, even more for me to "reclaim" ;)

Martin

Title: Re: joining into soil stack
Post by thescruff on Sep 27^th, 2005, 10:47pm

Soil pipe has to go into the IC, BC will not be happy branching into the pipe

Title: Re: joining into soil stack
Post by mjc on Sep 28^th, 2005, 12:15am

Had another dig today and I think that there should be just enough room to get a small access chamber connected to the old toilet waste pipe, that way I shouldn't have to disturb the IC at all!

quick diagram and photo here http://www.engelside.co.uk/toilet1.htm

The only problem is whether there is enough room to get a plastic to clay pipe join in.

Martin