Drainage pipe location

[vfrdave]

Where should my drainage pipe be located?  I have a utility room which will have a washing machine and probably a sink and therefore a waste pipe.  The area in were these would be located is not on an external wall, the only external wall area is beside my front door.  Builder has told me that washing machines/waste etc come out above the sub floor and into a gully but this doesnt seem right with me as I definitely dont want a waste pipe tracking down the curved section of wall beside my front door.

 

Should this have been treated the same way as the bathroom/utility room wastes and piped through the subfloor?

 

Thanks in advance.

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[PeterW]

Normally you either go into a stack or can use an internal floor gully with an inset sealed socket to take the 40mm waste pipe. 

 

Any chance you can drop to an external and then route round underground to the existing waste..?

[Bitpipe]

All our kitchen and utility wastes (sinks, dishwasher, washing machine, water softener) all go into the same drainage stack and then into the main sub floor foul stack.

 

[le-cerveau]

Just pipe it as any other waste.  Having lived in many houses, some newish builds, that is the standard.  The waste pipe is simply connected to a adaptor on the sink waste.  In older houses that don't have a normal waste where the machine is going then it would be run outside to a gulley.

[vfrdave]

Yes I suspect that we should have had a waste pipe through the subfloor like the bathroom and kitchen, but they didnt do it and didnt like it when I questioned it.  Slowly are relationship is becoming more fractured as I question things.

 

Any way out of this now?

48 minutes ago, PeterW said:

Normally you either go into a stack or can use an internal floor gully with an inset sealed socket to take the 40mm waste pipe. 

 

Any chance you can drop to an external and then route round underground to the existing waste..?

can an internal gully be placed in the insulation layer as my subfloor has already been poured? Really want to avoid a visible waste pipe on the outside beside the front door.

Edited May 3, 2017 by vfrdave
more info

[PeterW]

 

 

1 hour ago, vfrdave said:

 

 

Any way out of this now?

can an internal gully be placed in the insulation layer as my subfloor has already been poured? Really want to avoid a visible waste pipe on the outside beside the front door.

 

You mean in the insulation below the screed and above the slab ..?

 

Most likely yes assuming the length isn't too far and you're  able to get a fall on it. Similar to what you do with kitchen islands, make sure you put an access plug on the machine end so you can get to rod it if needed. I'd also go for 50mm pipe to be on the safe side. 

[AliG]

You can put a 40/50mm waste into the floor. But how close is the nearest stack?

 

Due to minimum gradient rules there will be a practical maximum length of pipe you can get within the thickness of your floor, I doubt this will be much more than 3 or 4m.

 

I am not clear on if there are any rules for this, but it looks unlikely that you will be able to take such a pipe to a stack in a straight line. You then have the issues of joints in the floor as well as corners reducing the flow.

 

I too would hate the thought of putting the waste pipe through the outside wall.

 

Is that the kitchen I see at the bottom of the plans? Could to be possible to batton out the wall under W2 and run the pipe behind the wall until it gets to the kitchen and connect to a stack in there?

[vfrdave]

2 hours ago, AliG said:

You can put a 40/50mm waste into the floor. But how close is the nearest stack?

 

Due to minimum gradient rules there will be a practical maximum length of pipe you can get within the thickness of your floor, I doubt this will be much more than 3 or 4m.

 

I am not clear on if there are any rules for this, but it looks unlikely that you will be able to take such a pipe to a stack in a straight line. You then have the issues of joints in the floor as well as corners reducing the flow.

 

I too would hate the thought of putting the waste pipe through the outside wall.

 

Is that the kitchen I see at the bottom of the plans? Could to be possible to batton out the wall under W2 and run the pipe behind the wall until it gets to the kitchen and connect to a stack in there?

The kitchen is beside the utility, I have attached another picture for clarity.  The soil stack in the kitchen is in the horizontal bit of the U island so quite a run to get a fall from the utility.

To be fair 3-4m run in the floor would see me get outside below finished floor level but maybe not low enough to hide it within the ground level outside and then I still need to get it to a main sewer run.  If only my contractor had put a soil stack in the subfloor as instructed!

 

 

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[PeterW]

About 6m by my calculation which at 1:20 (its just water so no solids to worry about) is 75mm fall. Even with a standard insulation spec and 65mm screed you should have double this so I don't see an issue..??