Washing machine hose below floor level

[Arnaud Blois]

Hi everyone,

I re-arranging my kitchen and would like to install the washing machine with the following setup. I will cut a trench in the concrete below the wooden floor to fit the hose for the waste.
Do you think that would work?

Thanks for your help and advice.

 

[Aire]

It will be fine with copper, I wouldn't do it with a hose.

 

[BYP]

Copper pipe and sleeve it with 21.5mm plastic overflow pipe.

 

[Harvest Fields]

If that is for the waste then I have seen it done like that but I wouldn’t want to myself just incase there are issues later on?

 

[Aire]

Oh the waste? Yeah looking at the diagram it does look it's the waste. Could be a future problem if it blocks but if you trench out deep enough and sleeve the hose in some 1 1/4" waste pipe using swept bends or 45°s so it can be pulled back out if needed then I don't see an issue.

 

[Arnaud Blois]

Thanks for your replies. Yes it is for the waste. I have updated the picture to make it a bit more accurate (showing the existing sink vent).

 

[rpm]

Terrible idea.

 

[Ric2013]

Can't see it being much different from running the waste hose along the floor. It would be better protected if run in a duct of some kind under the floor than if run on the floor surface. Might be worth working out some kind of leak sensor to throw down there in the unlikely event it leaks.
Not quite sure why others think the idea is terrible. Can they expand?

 

[Rob876]

If your going to that trouble why don't you just run the waste directly out to soil stack or external sink drain rather than rise up to the trap under the sink?

 

[chris watkins]

Your washing machine pumps might not last too long as they will be a lot more work. You can get a pumping unit to go in between to do the same thing but check there rating if you do hot washes.

 

[rpm]

Normal instructions are Up, Along & Down. Doing it your way will leave +90% of the hose full of water and therefore as Chris said the life span of the pump will be considerably shorter.

 

[Ben-gee]

Sometimes I have found the only way (after newly fitted kitchen completed before getting involved) is to join two hoses together under the units. I do this with a ribbed joining piece and jubilee clips, then into sink unit and up to a crook before final downward connection to trap.
This has always seemed to work OK, although admittedly I don't think it's ideal.
Is this wrong? What else can you do in this situation?

 

[Rob876]

Could you run the waste under the floor direct from the washing machine in 40mm plastic to external gully or soil stack?

 

[rpm]

Sometimes I have found the only way (after newly fitted kitchen completed before getting involved) is to join two hoses together under the units. I do this with a ribbed joining piece and jubilee clips, then into sink unit and up to a crook before final downward connection to trap.
This has always seemed to work OK, although admittedly I don't think it's ideal.
Is this wrong? What else can you do in this situation?

May work but for how long with the extra strain on the motor/pump? Run it up high inside the units and clipped to the back to prevent sags in the hose.

 

[rpm]

Could you run the waste under the floor direct from the washing machine in 40mm plastic to external gully or soil stack?

Would require a check valve.

 

[Ben-gee]

That actually sounds quite a lot better! If custard agrees, with a bit of persuasion.