Washing machine waste

[amavadia]

Hi all

 

bit of advice please...

 

putting in a new L shaped kitchen and the washing machine will be at the end of the long run of units. About 5m away from the soil stack the waste is going into. The sink and dishwasher will feed into the waste pipe earlier about 1.5m from the stack. It’s already taken out of the stack too high at about 40cm, and then as there is a gradient to allow water to flow, by the time it gets to the washing machine location it’s too high for a standpipe. 

 

I was thinking of putting an air admittance and then a running ubend like below and then an appliance inlet, the kind you find on a waste fitting under the kitchen sink.

 

https://www.toolstation.com/running-trap-76mm-seal/p63996?store=EF&utm_source=googleshopping&utm_medium=feed&utm_campaign=googleshoppingfeed&gclid=CjwKCAiAxKv_BRBdEiwAyd40N47zgB-l74Ot0j0kGtuLqG-RlFeDKsCy8qK_gPmszuXZykDUM3gOnBoCoIcQAvD_BwE

 

Would this be ok or are there better options?

[Russell griffiths]

I would not do it how your proposing

is there not the option to drop the waste pipe down to where it should be?

 

if not I would fit an inline trap, one with a waterless trap and instead they have a rubber flap to keep smells out, then maybe an air admittance valve on the end of the run. 

 

That pipe needs more clips or it will sag. 

[PeterW]

New Strap Boss on to the soil pipe and do it properly - get it much lower down. If a WM is going on the end of that run then I would give it it’s own run along the bottom with the correct pipe work or you are asking for problems long term. 

[amavadia]

Unfortunately the soil stack isn’t accessible anymore and been plastered in. Also there are water pipes coming out under the waste pipe so not really much opportunity to relocate it lower.

 

I could lower it slightly by loosing some of the gradient but would still be about half way up the unit I think. 

 

Usually under sink waste traps have appliance inlets which have a direct connection where washing machines can connect rather than a standpipe arrangement. Is there a particular reason it wouldn’t work at the end of the run?

[PeterW]

1 hour ago, amavadia said:

Unfortunately the soil stack isn’t accessible anymore and been plastered in. Also there are water pipes coming out under the waste pipe so not really much opportunity to relocate it lower.

 

I could lower it slightly by loosing some of the gradient but would still be about half way up the unit I think. 

 

Usually under sink waste traps have appliance inlets which have a direct connection where washing machines can connect rather than a standpipe arrangement. Is there a particular reason it wouldn’t work at the end of the run?

How come ..?? If it’s below / behind cabinets does it matter ..?? And you can work round pipe work, this should really be sorted properly not compromised. 

 

There are appliance end adapters but you need to make sure you get a decent water seal with a washing machine - in-line u-traps aren’t the best but they can work. 

https://www.screwfix.com/p/mcalpine-wmf3-straight-nozzle-1-white-45mm/5689P

 

Fits into a compression straight connector

 

Could do something like a HepVO or a MacV with a straight adapter but I’d want it accessible. 
 

https://www.toolstation.com/mcalpine-macvalve-2-self-closing-valve/p49408

 

[joe90]

@amavadia can you post a pic of the stack or is it fully enclosed?

[Russell griffiths]

1 hour ago, PeterW said:

How come ..?? If it’s below / behind cabinets does it matter ..?? And you can work round pipe work, this should really be sorted properly not compromised. 

 

There are appliance end adapters but you need to make sure you get a decent water seal with a washing machine - in-line u-traps aren’t the best but they can work. 

https://www.screwfix.com/p/mcalpine-wmf3-straight-nozzle-1-white-45mm/5689P

 

Fits into a compression straight connector

 

Could do something like a HepVO or a MacV with a straight adapter but I’d want it accessible. 
 

https://www.toolstation.com/mcalpine-macvalve-2-self-closing-valve/p49408

 

I’m sure that’s what I suggested 5 hours ago ??‍♂️

[amavadia]

Not the best pic but this was a while ago. Waste pipe is connected and goes round the kitchen from the top outlet. Hot and cold attached and fitted round the kitchen on the bottom two now too.

 

Its fully closed in. The waste pipe is about 35cm off the ground. The bottom 10cm are taken up by the clay socket for the soil stack, the hot water pipe is the next one up but it comes down from upstairs where the boiler is, on the left of the soil stack and then round the back of the stack and out the box section's right side so to move that up would need opening up the other side of that box to cut and re-solder the water pipe.

 

 

 

 

I like the look of the waterless traps but would still like to understand what the potential issues are here which people are concerned about using anything other than a standpipe arrangement? 

 

Also it is going to be an integrated washing machine so would have to check there is enough space behind it for the fitting. If depth isn't an issue it would definitely be accessible.

 

Do these things not drain fast enough? Do you need to let air in? Does the washing machine pipe need a peak of a certain amount before coming down and connecting to them?

 

I am a novice and doing this all myself. If I had done a washing machine before I would have known about the boss height for e.g. but all a learning experience I guess... just a frustrating one. ?

 

 

[Russell griffiths]

You don’t normally put the waste behind the machine, it goes in the cupboard next to the machine with a hole in the side of the cupboard for the drain pipe, putting it behind normally ends in a world of pain trying to install the machine and get the pipe all in, let alone clearance problems. 

[joe90]

Can’t see your waste pipe? Is that boxing in plasterboard?, personally I would cut into that, put a strap boss as @PeterW says above wherever you can closer to the floor. What’s going in that space between cabinet and boxing in?.

[amavadia]

2 minutes ago, joe90 said:

Can’t see your waste pipe? Is that boxing in plasterboard?, personally I would cut into that, put a strap boss as @PeterW says above wherever you can closer to the floor. What’s going in that space between cabinet and boxing in?.

 

Its an old photo before I connected the pipe. The stub above the 2 water pipes is where the boss is. A new boss would be a max of 10/15cm closer to the floor I think. Part of the problem is the length of the run being about 6m from the stack to where the washing machine is so I lose a fair bit on the gradient because I put a decent drop on to get a good flow (again not knowing about the standpipe issue which would come up later!)

 

Does anyone know what the minimum distance from the horizontal waste pipe to the top of a standpipe that you can get away with is?

[amavadia]

38 minutes ago, Russell griffiths said:

You don’t normally put the waste behind the machine, it goes in the cupboard next to the machine with a hole in the side of the cupboard for the drain pipe, putting it behind normally ends in a world of pain trying to install the machine and get the pipe all in, let alone clearance problems. 

 

Ah so maybe not so easy to make it accessible then. The unit to the left is a drawer unit so would have to make the back panel removable. Its a thin board which slots into the grooves on the back of the flatpack unit at the moment.