RC slab and waste drainage

[LSB]

Hello

Our SE has specified a reinforced concrete (RC) slab with 2 layers of B1107 mesh with make-up of:

 

castles 50mm up

mesh

chair 100mm 

mesh

50mm above

totally 200mm

 

How do I put 110 waste drain through this, as in is it okay to cut a channel and keep the integrity of the mesh.

 

SE and BC both asked and both very reticent and slow with replies and we'd love to get on.

 

There will also be 50 PIR above slab (more below already) and 50mm screed.

 

Thanks

 

 

 

 

 

[BotusBuild]

Our waste pipes went vertically (as you'd expect) through the slab and the insulation below it and the went horizontal (with the needed drop of course) to the STP.

 

Yes, we had to cut the mesh/chair/castle makeup to accommodate this. It is normal.

[torre]

You could enquire whether you can use fibre reinforced concrete instead of mesh. Cost more to pour but less labour faffing with mesh