New kitchen, drainage advice please

[rhino666]

Hello

I am fitting a kitchen in a new room without services. Looking to tile the floor so everything under the tiles really needs to be fit and forget.
Looking for best advice on fitting drainage for the sink and dishwasher please.
Photos of situation below. Sink will be under window and dishwasher next to that, so one drainage pipe to exit property.
The path level, outside is 8cm above the concrete base under floorboards. If I hole drill the wall at the lowest convenient point, I would be around 18 inches above the path height.
Ideally the exit pipe would be hidden outside but I am thinking that will not be possible but grey pipe would show up far less than white.
Dig a hole in the path next to the wall, install a trap and then join up to the 100mm plastic drainage pipe running across, about 3 metres away?

 

[Deleted member 120897]

I’m struggling to believe that if you drill a hole, it will be 18” above the path?

 

[rhino666]

I’m struggling to believe that if you drill a hole, it will be 18” above the path?

The path level is quite a lot lower than floorboard level and only 8cm above the concrete base which is 14-15 inches below the floorboards.
If I drill a hole just above the skirting board height, it will exit a little over 18 inches above the path

 

[oz-plumber]

Why wouldn't you install a trap under the sink and then connect it directly to the drain?

 

[snowhead]

Just a couple of thoughts;

Paint the pipe a colour that blends into the wall, it doesn't have to stay Grey / Black / White (dull the pipe surface then paint gloss direct onto the PVC, don't use undercoat).

When you say Trap I assume you mean gulley, either with hopper or with 40mm x 110mm adapter to Underground?

If the floorboards are actually that much higher than outside then drill through under the floor if you want minimal pipe exposed.

 

[rhino666]

Why wouldn't you install a trap under the sink and then connect it directly to the drain?

Exactly what I am intending to do, trap under sink and then into drain.
Just want to avoid ever having to interfere with the tiled floor that will be installed.
Perhaps I could just drop the drain pipe straight through the floor, run it out through the wall at the lowest point. Could then concrete it in to the top of the new drain with 'p' trap underneath?

 

[rhino666]

Just a couple of thoughts;

Just a couple of thoughts;

Paint the pipe a colour that blends into the wall, it doesn't have to stay Grey / Black / White (dull the pipe surface then paint gloss direct onto the PVC, don't use undercoat).

When you say Trap I assume you mean gulley, either with hopper or with 40mm x 110mm adapter to Underground?
View attachment 81836
If the floorboards are actually that much higher than outside then drill through under the floor if you want minimal pipe exposed.

Thank you snowhead, and yes that gulley looks like the sort of part that will be fitted; think it is also known as a 'p' trap. The hopper fits on top. Just wondering if they do a hopper with a facility to join the 40mm? pipe from the house straight into it? Looks like they do......
110mm Rectangular Hopper Spigot End Underground Drainage - https://www.plastics-express.co.uk/underground-drainage/Underground-Drainage-110mm/110mm-rectangular-hopper-spigot-end-p-pte340?gclid=CjwKCAiAjPyfBhBMEiwAB2CCIrhTsFCLF2vN4SSKVqUgYU4Rizol3px4ttuLIM3rITjgEHl1cNpthxoCj4cQAvD_BwE
If I punch through the wall, just on top of the concrete house base, I would be an inch or two under the path surface outside which should work well.
The pipe would go straight down through the floor and then perhaps 120 degrees across at a bit of a downward angle to the hopper. Guess it's best to solvent the 40mm pipe joins?
If this is in place, dropping through a tiled floor, does it stand a fair chance of surviving without needing to be touched for any reason for say 20 years? Obviously I accept that we would have to be sensible with what goes into the sink/dishwasher.

 

[Timmy D]

If the stack is 3m away, just run the waste under the floor boards internally until you’re at the stack and then punch out through the wall directly into a tee.

 

[rhino666]

If the stack is 3m away, just run the waste under the floor boards internally until you’re at the stack and then punch out through the wall directly into a tee.

There is no stack; the foul water 110mm brown pipe runs under ground parallel but at an angle to the house, so 40mm pipe will go out through the wall and into a gulley. outflow from gulley will probably join a 'y' piece inserted into the foul water pipe.
Almost there with this. Only unanswered question
is the advisability of dropping through the tiled floor into the void and what angle is a sensible drop angle for the foot or so of joining pipe to the square hopper. I was thinking 120 degree, so 30 degree drop but the port receiver on the square hoppers looks like it requires the 40mm pipe to enter dead straight?

Thank you

 

[oz-plumber]

Why do you need a hopper?
Can you just not connect it to the drain directly.

The connection into the hopper will be at the required angle.
They are made that way