Washing Machine waste pipe route

[DJS]

Hi!
I would like to move the washing machine to the other side of the kitchen to improve the layout.
The problem is that the back door would be between the W.M and the existing waste outlet to the drain. Is it possible/allowable to run a standpipe down under the floorboards incorporating a trap of some sort then back up on the other side and through the wall to the drain?
The top of the standpipe would be two feet or so above the floor and the other end through the wall at most about six inches above the floor. I hope this makes sense!
Any ideas?
Cheers,
Djs

 

[brumylad]

The waste pipe must have a continuous fall into the gully or soil stack and not go "back up again". Because of the length of the run I would make it 40mm pipe and incorporate an air admittance valve.

I think the main question here is, can a 42mm hole be drilled through your outside wall at a point which will be both above the level of the gully or soil stack on the outside and below the level of the floor joists on the inside of the wall?

Other options would be to modify the underground drainage and install a new gully on the other side of the door or pump the waste to were you want it to go using a pump or a macerator.

 

[DJS]

Thanks Brumylad
No it would not be possible to have a hole through the wall above the drain gulley & below the floorboards. Building a new drain etc is not really worth the effort and expense just for the washing machine.
It always was a long shot of an idea!
Thanks again,
DJS