Waste pipes through walls

[Mr Blobby]

So our ground floor plans have three seperate details (kitchen, utility and cloakroom) like this:

 

 

 

... where the 50mm waste pipe is intended to go through the wall. (I know this from other section details)

 

This seems a but untidy, particularly as the above pipe would exit the wall at the patio area.

 

Would it be better, in the above cloakroom, to connect the 50mm waste into a new 110mm waste that enters the KORE slab under the sink to run underground to the outside? 

There is plenty of space to build another void behind the sink to hide the waste.

(This would be in addition to the stack on the other side)

 

What's the best option here? 

 

Edited December 19, 2022 by Mr Blobby

[Russell griffiths]

In a modern build in my opinion you shouldn’t have any pipes exiting through the wall, I certainly would not want to see them outside 

i would plan all the drainage to be under the slab with a 110 mm stub showing where you are having bathroom equipment.

  

[Mr Blobby]

1 hour ago, Russell griffiths said:

In a modern build in my opinion you shouldn’t have any pipes exiting through the wall, I certainly would not want to see them outside 

i would plan all the drainage to be under the slab with a 110 mm stub showing where you are having bathroom equipment.

  

 

Thanks, that's what I thought would be a better solution. 

 

In my cloakroom image above, there's no neat way to connect the sink waste to the WC stack right? 

[Nickfromwales]

Nope.

As per the man above, a rising 110mm for every item, but you can connect to the foul at the WC for the basin as you’re allowed a change of direction if it’s not foul / solids. 
Prob easier to connect to one incoming underground pipe vs bringing 2 in to the same IC. It’s just a basin so very little duty and clear running water. 

[Nickfromwales]