Advice needed please

[Lounge About]

Hi,

I am fitting a new loo and want to tie in to the underground drainage here

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• Lounge About
• 18 Nov 2012
• 1

I did want to add an inspection chamber but wondered if i'd be able to get away with something like this

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• Lounge About
• 18 Nov 2012
• 1

what do you think??

 

[Hugh Jaleak]

I think the salt glazed pipe is probably 150mm (6") there, next size up is 225mm (9"), highly unlikely thats been used at that point. Anyways, you wont get a small diameter inspection chamber for 150mm pipe so would need to dig back and put a bigger (750mm) diameter chamber in. Also, using all those fittings will take a fair bit of room, although doubtful you'll need the 225-150mm reducer.

Alternatively, if the new pan is to go behind the wall, come out horizontally and tee into stack. Maybe wise to fit a rodding point into the stack at same time.

 

[Lounge About]

thanks for the quick reply!

the grey pipe is 110mm and the ceramic pipe which is still half buried was crudely measured at 190-200mm (so I assumed it was 200mm). The new soil pipe comes from under the floorboards so has to connect to the drainage under the ground.

I was only going to put an inspection chamber when in my mind it would all be 110mm pipe here, only when I dug it up my mind was changed.

Do you have any other ideas I could use for connecting all these together?

 

[dcawkwell]

Connection into the soil stack seems the best.
Doing something else seems a lot of work and hassle to achieve very little.

 

[Lounge About]

It will be too low to connect to soil stack thus the reason for asking for advice, cheers

 

[Agile]

Its not what I often get involved with it but I thought that S.G. pipe was sized on the internal diameter of 4" and 6" ???

 

[dcawkwell]

It will be too low to connect to soil stack thus the reason for asking for advice, cheers

Toilet with soil at the rear should come out above the ground unless you have
a bathroom underground.

 

[Lounge About]

it's not in the room that this wall is for and I don't want it running through the middle of the room I might trip over it

 

[Hugh Jaleak]

Ultimately you are governed by whatever Building Control will permit, but I'll bet they'll want a chamber on the junction of the pipework. It'll be a 6" pipe, the salt glazed stuff has thick walls hence the external diameter.

I'd suggest you (carefully!) dig back until there is sufficient room to get a chamber in, may be able to get around matters by reducing the 6" to 4" immediately before fitting the chamber, then renew the bend etc, and run your new connection in 110mm plastic. Seems odd running 6" up so close before reducing to 4" but plans may have been changed at the time it was laid.

 

[Agile]

http://www.pavingexpert.com/drain15.htm

That will give you lots of useful information!

Strangely it seems to support my recollection that they are based on the INSIDE diameter!

Most current pipes are thinner and lighter but with the same matching internal ( 4" ) diameter.

Tony

 

[Hugh Jaleak]

Sorry if i've caused any confusion over sizing Tony. The OP was reporting a measurement of approx 190-200mm outside diameter, hence my comment about the thick walls. Given an internal diameter of 150mm (6"), then allowing 20mm each side for the pipe wall, should correspond to the OP's measurements of 190-200mm O.D.

 

[Lounge About]

Cheers guys, got a busy time digging

 

[Hugh Jaleak]

May not need too big a hole, if you can reduce from 6" salt glazed to 110mm plastic, (use a 'Flexseal' type connector), you should be able to get away with a 225mm dia chamber just outside the wall. Will need a rest bend at the bottom of the existing stack as well.