Use washing machine without waste trap

C

CrazyFool

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Hi guys.

I have a washing machine on the first floor of my house.

Have a bit of a problem with the water out drain.

Please see attached photos.

I wanted the stand pipe to be in the corner where the fresh water inlet is. I came home from work mortified to find it like this.

The plumber said he had to do this because there is a joist at the orange line which he can't cross. So he just ran the black drain pipe alongside the joist at the appropriate.

The only problem is, I need the washing machine flush against the wall on the left but the stand pipe will obviously be in the way.

In the photo I have demonstrated what I want to do. Is this possible?
Can I just push the flexible outlet pipe from the washer straight into the black elbow without the standpipe?

The elbow connects to a 2.5m run across with the appropriate slope.
That goes straight down into an open drain hole outside.

Many thanks

CF
 
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I don’t like calling, but that’s bad. Can it not be put into the kitchen sink waste trap? I’m sure there’s a way around that.
 
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Washing machine is in laundry room.
There are no nearby traps it can go into.

Im thinking if I shove the flexible washing machine pipe deep enough, there won't be any water coming back up.
The washer outlet is pressurised.
The slope will ensure no water comes back up.
Am I wrong here?

I would have liked to have a trap to stop gurgling noises and smells but beggars can't be choosers. Thankfully there's no foul smells because the waste water goes into an open drain.
 
You’ll possibly still get smells coming back up open drain or not. I’d just surface mount the upstand trap if possible and connect to that piece.
 
Nope, that just isn't right. It will undoubtably cause issue in the future be it smells/draughts/backflow. The drain hose needs a proper place to live.

Worst case I would look to do with that would be to put a waterless trap in horizontally where that black elbow is then put a 43mm compression spigot into the end of it and clip the the drain hose to that, then notch the joist and sit the drain hose in that to allow it to come right and then up in the corner.
 
Madrab said:
Nope, that just isn't right. It will undoubtably cause issue in the future be it smells/draughts/backflow. The drain hose needs a proper place to live.

Worst case I would look to do with that would be to put a waterless trap in horizontally where that black elbow is then put a 43mm compression spigot into the end of it and clip the the drain hose to that, then notch the joist and sit the drain hose in that to allow it to come right and then up in the corner.
Click to expand...

Thanks for the reply buddy.
Im really sorry but Im technically challenged and don't quiet understand what you just said :S
Any chance of a diagram or explaining it again really slowly?

With respect to the risks, I don't mind a bit of draft as we keep the window open 24/7 anyway
Smells - the drain pipe flows out into the open so the only smell that will be coming in is fresh air.
The only thing I'm afraid of is backflow but don't see how that's possible given the slope and pressure leaving the washer.

Thanks again

CF
 
Are WM drain hoses large enough to prevent siphonage these days?If not, If the end of the drain tube goes down to floor level and there's no air gap at some point , whats to prevent fill /empty loop through siphonage
 
Cut the black pipe back to the left and attach one of these into the gap
th



.... then put one of these into the end of it
th

then attach the drain hose to that and then cut a notch into the joist to take the drain hose
lostinthelight said:
whats to prevent fill /empty loop through siphonage
Click to expand...

As long as the drain hose is left attached to the top of the machine then that creates an anti syphon loop. Or use the cold former that always comes with the machine and attach that to the wall
 
Mount the machine on a small timber plinth with the drainage diverted underneath - will also give a solid base to stop the machine jumping around on the suspended floor.
 
Madrab said:
Cut the black pipe back to the left and attach one of these into the gap
th



.... then put one of these into the end of it
th

then attach the drain hose to that and then cut a notch into the joist to take the drain hose


As long as the drain hose is left attached to the top of the machine then that creates an anti syphon loop. Or use the cold former that always comes with the machine and attach that to the wall
Click to expand...

Thanks buddy.
That makes perfect sense. I'll go out to the shops this week and invest in it all.

cdbe said:
Mount the machine on a small timber plinth with the drainage diverted underneath - will also give a solid base to stop the machine jumping around on the suspended floor.
Click to expand...

Great idea. Sounds like an aircraft takeoff when the machine is spinning on the suspended floor. This will also save me needing to notch as well. What are the best materials to put underneath the washer?

I was thinking lots of fabrics to absorb the spin vibrations.


I have two more questions regarding the trap:

1) can I put the trap outside where the black drain pipe leads out to? I have lots more space to work there.

2) hypothetically, could I get away without the trap? There is an air gap before the waste pipe Drains out into the open. I'm not concerned about sewage gases coming back up.
 
The green matting used for laminate floor underlay has worked well for me for damping machine vibrations.

Trap outside is a bad idea- it'll freeze up in winter.

Yes you can run without a trap but you will get drain whiff and you will get a permanent draught.
 
Good grief, that is not the work of a Plumber. Dont see any reason why the pipe cannot come up from that bend in the floor, and either fit a waste valve in the vertical section, or a standpipe, and hook the drain hose into that.

Needs sorting out properly. Leaving it as is may cause the machine to malfunction, (it cant fill with water as the drain hose is too low), and if that doesn't happen, possible it may pump out faster than the water can get away, and the pipe will overflow, flooding the room below.

Whilst we're here, where is the isolating valve for the cold water supply to the machine?
 
D

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