Hi!
I would like to move the washing machine to the other side of the kitchen to improve the layout for the missus.
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

I think I'd have a problem with the suggested routing of the waste pipe as follows.

With the waste pipe disappearing under the floor for a few feet and then rising back up, as it holds water it could potentially freeze during the winter months.

Often washing machine wastes are drooped into the waste pipe rather than being clamped, so if there was an ice plug in the waste pipe you'd probably find that it would overflow all over the floor.

Plus, over a period of time you might find debris from the washing machine building up and forming a plug, so it might not need freezing conditions to restrict the flow.

One thing you could potentially think about doing (not that I think it's a brilliant idea either) might be to get a long piece of waste hose and route that alongside the door sill. You'd need to figure out some means of protecting it though.

Andrew

Do you perhaps have an option of re-routing the external waste pipe? Presumably there's a step outside the door, and you might be able to get a 40mm (or is it 42mm?) plastic pipe across the back door but under a flag stone or something?

If that's a possibility then you could punch a hole thru the wall next to the washing machine to take the waste outside.

If you can get a slight incline on the outside pipe running across the doorway then freezing isn't likely to be an issue - it's standing water that freezes to form a plug, and waste water from a washing machine is usually fairly hot, so I'd be inclined to think it wouldn't have time to freeze before it ran into the drain.

Andrew