Cutting a channel in party wall

[Yukster]

I'm guessing if you are prepared to weaken a steel bearing wall for aesthetics
then the replies are falling on deaf ears. I have seen a lot of *******s in my time but I
have not seen that one before.

Can I clarify, i am not willing or prepared to weaken the steel for aesthetics. I just became aware that the way the channel was cut is a problem. Those of you who red my post will see that i will run it by a structural engineer and will follow his instructions to the letter to ensure that structural integrity hasn't been compromised. If re-bricking the channel is needed then this is what I will do.

Here's my kitchen plan. The the only toilet in the house is in the bathroom above the kitchen and the waist pipe comes down in line with the sink. The gap between the cupboards and the ceiling is actually 308mm not 108mm

So now that we got that cleared up, can someone offer a viable/creative solution? For example, Do you think it would work if i did the following
1. re-brick the channel correctly
2. run the waistpipe vertically boxed along my side of the partition wall and then turn 90 degrees and run it horizontally 500mm above my kitchen wall cupboards
4. Once beyond the partition wall. could i to chase it into the cavity wall which wont affect my neighbour because my house has been extended out and his hasn't

 

[PTS2]

I wouldn't pay an engineer to tell you to put those bricks back. We've got a 7m soil pipe boxed into our kitchen ceiling alongside a bit fat steel beam and nobody knows it's there. If you chop a 100mm horizontal channel into the inner leaf of a cavity wall how are you going to stop the extension falling down?

 

[bernardgreen]

Those of you who red my post will see that i will run it by a structural engineer and will follow his instructions to the letter to ensure that structural integrity hasn't been compromised.

It should have been "run past a structural engineer" before you started planning the kitchen.

What are your "plans" about rodding access to the soil pipe ( waist pipe ) if you do run it horizontally through the kitchen. Horizontal and it will clog up. It will need to slope down at the correct angle to ensure flow occurs.

 

[PTS2]

He's got building control involved so the drains will be looked at. Reading between the lines he needs to get a proper builder in.

 

[oldbutnotdead]

You can't chase it into the wall . Can't remember max chase depth (think its 1/3 wall thickness vertically and 1/5th horizontally but may be wrong) but you definitely aren't allowed to set 110mm into a 110mm wall horizontally or vertically.

Yes you can box it in above your cupboards (you need some fall on it tho, horizontal won't work), you must retain access for blockage clearance.