Sink Waste Options?

[wozza]

Hi All,

 

Looking for some advice.

 

Builder has started work on our extension today and has suggested that the Kitchen Sink Waste (Also the dishwasher and washing machine) could be piped through the wall and then into a Gully Trap which then is connected to the sewer inspection chamber a few meters away from the house - I am guessing that this is the easiest and cheapest option for the builder.

 

Are there options available so that I could do this internally as swmbo does not like the idea of external pipework - I know that we could have a soil vent pipe but it seems overkill for just the sink dishwasher and washing machine.

 

Any suggestions or alternatives.

 

Thanks, Wozza.

 

Just added the pic below - would this work - the gully trap would be external - the white pipe would then be internal for sink etc?

Edited January 2, 2019 by wozza

[joe90]

I also hate external pipes, mine is a new build and we have internal pipework to external gulley trap then sewer manhole as you suggest, more work than external but very possible and make sure you tell your builder what YOU want.

[ProDave]

110mm drain in under the foundations, coming up against the outside wall under the sink, Reducer to 40mm and up to sink waste trap with washing machine point.

 

Probably won't even need an air admittance valve (ours does not)

 

Get a plumber to do it, not a builder.

[Roundtuit]

As above.  No need to have external waste pipes; all ours run internally as I'd rather loose the space than see them on the outside.  It just needs a bit more thought in the early stages.

[wozza]

Thanks all for your advice, pretty much got it worked out it my head now.

 

[Annker]

On 02/01/2019 at 22:23, ProDave said:

110mm drain in under the foundations, coming up against the outside wall under the sink, Reducer to 40mm and up to sink waste trap with washing machine point.

 

Looking to do a sanity check on the drainage arrangement above as its one I'd like to use in my current project.

 

Do I understand correctly that the domestic waste traps (kitchen sink, DW and washing machine) can be directly connected to a main sewer run via a suitable sized reducer on to a 110mm branch?

I imagine that the reducer provides a sealed connection and the trap on the domestic waste prevents foul gases escaping?

 

[ProDave]

Yes 110mm to 40mm reducers are standard items and all sealed.  It does not even need a branch straight into the top of the 110mm might be okay in some situations.

[Annker]

1 hour ago, ProDave said:

Yes 110mm to 40mm reducers are standard items and all sealed.  It does not even need a branch straight into the top of the 110mm might be okay in some situations.

Thanks Dave

That's very useful to know, helps my design along.

 

So I imagine my other arrangement will remain for RWPs and the version below (if I have interpreted correctly) will works for domestics  

[ProDave]

Yes you won't need the bottle trap outside.