Is this washing machine drain possible?

[If in doubt...]

Hi all,

About to convert my son's garage to a kitchen / diner as below and would really like to move the washing machine in to a new mini utility as shown. The existing garage floor is only 73mm lower than the kitchen floor so basically we are looking to install 22mm chipboard flooring sat on 50mm Celotex type floor insulation. So there is only a 50mm high void within the Celotex to run roughly a 2.5 metre length waste pipe - is this advisable or am I asking for trouble? The thinking is run a straight length and punch it straight out through the external wall behind the existing washing machine position and then run horizontally across externally to the drain.

Thanks in advance.

 

[denso13]

Pushing it at 40mm pipe but you won't get enough fall on it. Unless you cut the existing floor to get enough fall?

 

[If in doubt...]

Pushing it at 40mm pipe but you won't get enough fall on it. Unless you cut the existing floor to get enough fall?

Thank you. Cutting a groove in the floor might be doable - will have a look later on. I'm thinking I need another 20 - 30mm depth at the far end?

 

[denso13]

Yes, another 30mm as a minimum, the guidance being min 18mm/metre.

 

[If in doubt...]

Just managed to cut the groove in the floor and have got the correct drop - but is this kind of flexible section recommended?

It's solely for a washing machine for occasional use and I just couldn't get the orientation I needed using solid bends.

Thanks for your ongoing help.

 

[Hugh Jaleak]

It's nowhere near ideal, gunk can build up in the grooves of the Flexi and apart from stinking, can cause blockages, but if you make sure you can get access through to be able to clean that section going forward, then if needs must, it'll have to do.

 

[dilalio]

You can make a much bigger hole through the wall than that and then patch it up after.

 

[If in doubt...]

You can make a much bigger hole through the wall than that and then patch it up after.

Not quite so easy I'm afraid, where it exits externally on the other side of the wall it is right up against an adjacent side return wall which the last run has to be fixed against and it is the absolute minimum height already to give me the final correct downward run to get to the gulley / drain. I used every available combination of fittings but the final run ended up too low to give any slope or would clash with the wall for the final run.

Thanks for the input though.

 

[denso13]

Not ideal but it'll be fine.

 

[Collectors]

I would avoid the corrugated flexy pipe & cut the wall/floor for a 45deg bend. A lot safer.

 

[If in doubt...]

It's nowhere near ideal, gunk can build up in the grooves of the Flexi and apart from stinking, can cause blockages, but if you make sure you can get access through to be able to clean that section going forward, then if needs must, it'll have to do.

That was my concern with the ridges being gunk magnets but I just can't get the final onward run to work - but that flex section does exit that external wall the other side in a nice accessible position and if I I don't firmly solvent weld the final onward section of pipe it can easily be removed giving me perfect access to periodically clean the ridged section.

Thanks for the prompt response.

Cheers

 

[dilalio]

Not quite so easy I'm afraid, where it exits externally on the other side of the wall it is right up against an adjacent side return wall which the last run has to be fixed against and it is the absolute minimum height already to give me the final correct downward run to get to the gulley / drain. I used every available combination of fittings but the final run ended up too low to give any slope or would clash with the wall for the final run.

Thanks for the input though.

Mcalpine flexis are not ribbed inside and one end is compression so you could use that as your access point.

 

[If in doubt...]

Thanks all for your help !

Just to explain as below the red arrow was the final run I had to take and everything only just has just enough floor clearance for the slope - if only they did a 27.878 degree angle bend I would be fine lol

I'll see if I can get hold of one of those Mcalpine flexis which would certainly improve things.

Cheers

 

[denso13]

It's absolutely fine, as you say you have plenty of access on one side.