I'm looking for some detailed info, preferrably some diagrams for the
following...

House has downstairs wc, directly below upstairs bathroom, which has
bath and sink but no wc.
Downstairs toilet drains down into floor, out through back wall
(underground) and into sewer pipe.
There is no inspection chamber in the garden.

I need to add a toilet upstairs via an external stack. I'm also
thinking of connecting the downstairs toilet to this new stack, out
through the back wall and blocking off the current underfloor
connection. This is mainly because adding new pipework (for both
toilets) would be easier than trying to tap into the existing
underground one that goes to the downstairs toilet (I think?).

I then intend to excavate down to the existing branch (in the garden)
and install an inspection chamber, at that junction, while at the same
time, renewing the branch that goes into the sewer.

So, I will renew everything from the sewer, back to the house, to
supply the old and new toilets (and possibly kitchen sink and
dishwasher).

Should I decomission the current branch into the sewer, from the house,
and block it up with cement, making the new branch on a straight bit of
the sewer (away from the current branch)? Or should I make use of the
existing branch and put an IC in at that location?

Or, would it be possible to do this without using an IC and just
connect the new stack onto the existing branch at the back wall, before
it goes under the house and into the downstairs wc?

I'm familiar with the technique for tapping in to a sewer and adding a
branch, but I could do with seeing some diagrams that depict the
system, dimensions and materials etc. (Haven't yet found anything on
Google... not sure on the correct search query string(s).

I'd be grateful for any advice.

cheers,
deano.

The message .com
from "deano" contains these words:

I need to add a toilet upstairs via an external stack. I'm also
thinking of connecting the downstairs toilet to this new stack, out
through the back wall and blocking off the current underfloor
connection. This is mainly because adding new pipework (for both
toilets) would be easier than trying to tap into the existing
underground one that goes to the downstairs toilet (I think?).

Where is the current stack and why is it not practical to plumb the
upstairs WC direct into that?

--
Roger Chapman

On 25 Sep 2006 01:38:38 -0700 someone who may be "deano"
wrote this:-

I'm looking for some detailed info, preferrably some diagrams for the
following...

Borrow a book on drains from the library then, as well as looking at
manufacturer's web sites.

House has downstairs wc, directly below upstairs bathroom, which has
bath and sink but no wc.

Do the pipes from these go through the wall and into a hopperhead,
from which there is a pipe leading to a gully?

Downstairs toilet drains down into floor, out through back wall
(underground) and into sewer pipe.

How close to the toilet outlet is the gully I assume takes waste
from the bathroom?

I need to add a toilet upstairs via an external stack. I'm also
thinking of connecting the downstairs toilet to this new stack, out
through the back wall and blocking off the current underfloor
connection. This is mainly because adding new pipework (for both
toilets) would be easier than trying to tap into the existing
underground one that goes to the downstairs toilet (I think?).

Do you intend to move the existing toilet far from the current
location? If not, why not leave it where it is so that you have a
working toilet while the work is being done?

So, I will renew everything from the sewer, back to the house, to
supply the old and new toilets (and possibly kitchen sink and
dishwasher).

Is there any reason to renew all of this?



--
David Hansen, Edinburgh
I will *always* explain revoked encryption keys, unless RIP prevents me
http://www.opsi.gov.uk/acts/acts2000/00023--e.htm#54

Sounds like a good idea. I would leave the current toilet alone so it
can be used (even if the house ins't currently lived in) and try and
bring the new upstairs stack down by the side of it so that it can be
tapped into once the upstairs is completed. This will obviously need a
new pipe going through the wall for the downstairs toilet and a turn
connecting into the new stack. You might want to check this is all
within code as I'm not a plumber, but have done something similar at my
own house.

Roger wrote:
The message .com
from "deano" contains these words:

I need to add a toilet upstairs via an external stack. I'm also
thinking of connecting the downstairs toilet to this new stack, out
through the back wall and blocking off the current underfloor
connection. This is mainly because adding new pipework (for both
toilets) would be easier than trying to tap into the existing
underground one that goes to the downstairs toilet (I think?).

Where is the current stack and why is it not practical to plumb the
upstairs WC direct into that?

--
Roger Chapman

There is no stack! The downstairs loo goes down into the floor and
then,
AFAICT is connected straight into the underground pipe at the back of
the house.
There must be a stack somewhere, maybe for more than one dwelling, but
I couldn't see one.

Owain wrote:
deano wrote:
I'm familiar with the technique for tapping in to a sewer and adding a
branch, but I could do with seeing some diagrams that depict the
system, dimensions and materials etc.

One of the manufacturer's sites (eg Osma?) probably has catalogues with
lots of diagrams.

Owain

Thanks, I'll check those out

David Hansen wrote:

Borrow a book on drains from the library then, as well as looking at
manufacturer's web sites.

Yeah, the library occured to me... now I just need the time to get
there.

House has downstairs wc, directly below upstairs bathroom, which has
bath and sink but no wc.

Do the pipes from these go through the wall and into a hopperhead,
from which there is a pipe leading to a gully?

Good question, I didn't think to see where the u/stairs bath and basin
drained to! I think I need a revisit, with that at the top of the list.

Downstairs toilet drains down into floor, out through back wall
(underground) and into sewer pipe.

How close to the toilet outlet is the gully I assume takes waste
from the bathroom?

As above... need to re-assess this, I have no idea where the u/stairs
waste currently goes!

I need to add a toilet upstairs via an external stack. I'm also
thinking of connecting the downstairs toilet to this new stack, out
through the back wall and blocking off the current underfloor
connection. This is mainly because adding new pipework (for both
toilets) would be easier than trying to tap into the existing
underground one that goes to the downstairs toilet (I think?).

Do you intend to move the existing toilet far from the current
location? If not, why not leave it where it is so that you have a
working toilet while the work is being done?

No, the d/stairs loo will stay exactly where it is. Just need to plan
where to put the new stack and branch it into the main sewer, far
enough away from the existing branch.

So, I will renew everything from the sewer, back to the house, to
supply the old and new toilets (and possibly kitchen sink and
dishwasher).

Is there any reason to renew all of this?

Only that a house 2 doors down has done similar work and there, they
seem to have changed the downstairs loo to drain into the newly
installed stack for the upstairs loo, rather than leaving it to drain
into the existing set-up, as in this house. I did wonder why they might
have re-routed the downstairs loo into the new stack... any ideas?

thanks,
deano.

On 27 Sep 2006 12:34:57 -0700 someone who may be "deano"
wrote this:-

There is no stack! The downstairs loo goes down into the floor and
then,
AFAICT is connected straight into the underground pipe at the back of
the house.

Entirely normal with downstairs toilets and "two-pipe" drainage.

There must be a stack somewhere, maybe for more than one dwelling, but
I couldn't see one.

There should be a vent pipe somewhere.


--
David Hansen, Edinburgh
I will *always* explain revoked encryption keys, unless RIP prevents me
http://www.opsi.gov.uk/acts/acts2000/00023--e.htm#54

On 27 Sep 2006 12:46:14 -0700 someone who may be "deano"
wrote this:-

Is there any reason to renew all of this?

Only that a house 2 doors down has done similar work and there, they
seem to have changed the downstairs loo to drain into the newly
installed stack for the upstairs loo, rather than leaving it to drain
into the existing set-up, as in this house. I did wonder why they might
have re-routed the downstairs loo into the new stack... any ideas?

More money than sense?

Unless there is a problem with the existing drains I would tend to
leave them as they are. The only thing I might be tempted to do is
remove the existing gully and replace it with an easy bend which
leads to a new stack serving the upstairs bathroom. That involves
the minimum of digging, assuming the drains are deep enough at that
point for the bend.

As with all drains, Building Control are a useful source of
information.


--
David Hansen, Edinburgh
I will *always* explain revoked encryption keys, unless RIP prevents me
http://www.opsi.gov.uk/acts/acts2000/00023--e.htm#54