Kitchen waste pipe design

[WWilts]

Nobody likes blockages or inaccessible waste pipes.

Kitchen waste running behind units. Is that a bad idea?

Given the situation, how to mitigate?
Units not installed yet. Waste pipe hole through wall drilled. Can be redrilled if needed.

From wall end at right, no units for 300mm along wall
Then 500mm drawer unit
Then 1000mm corner carousel unit

Waste pipe hole 1000mm from wall end at right

[Nickfromwales]

Why haven’t you just drilled straight out and lost an unnecessary additional bend?

 

Then you make the external bend a T with a cleaning ( rodding ) eye on the end for self maintenance. 

[WWilts]

28 minutes ago, Nickfromwales said:

Why haven’t you just drilled straight out and lost an unnecessary additional bend?

Avoiding external pipes.

Is it possible to put a T on the internal bend(s)?
Should the waste exit through wall be moved to between units?

2 dishwashers also en route to waste exit (pic)

 

Edited July 4, 2022 by WWilts

[Temp]

We have 110mm pipe coming up through the floor under the sink. Think a rubber adaptor seals the 40mm sink and dishwasher waste pipe to the 110mm.  Never had a problem.

[PeterW]

Won’t the bifolds catch on the waste pipe ..?? Poor design IMHO

[Carrerahill]

3 hours ago, WWilts said:

Given the situation, how to mitigate?

Use 50mm waste, solvent weld, include rodding points. Plenty of brackets, then you have a solid, larger bore pipe which will handle most waste and if needs rodded its bigger and a solid install.

 

I have a fair bit of inaccessible 50mm waste but access points and a solid install mean I can get in and snake it easily enough. 

 

Under my sink I have a 50mm tee, into that tee I reduce to 40 and catch both wastes separately (this gives overflow protection if one U bend blocks and lets you get the job done before you get round to unblocking it).

 

I also use Tee's here and there with a 50mm screw on access point so I can get in. 

 

 

[WWilts]

5 hours ago, PeterW said:

Won’t the bifolds catch on the waste pipe ..??

Bifolds moved away from that corner by 400mm

[Nickfromwales]

On 04/07/2022 at 12:57, Temp said:

We have 110mm pipe coming up through the floor under the sink. Think a rubber adaptor seals the 40mm sink and dishwasher waste pipe to the 110mm.  Never had a problem.

This is what I do with every slab penetrations design, as it's just sooo much easier to not have smaller bore waste pipes traversing the walls / cutting units etc.