Patio and channel drain issues

Question

My newly installed Indian sandstone patio has multiple issues. Several slabs lift off easily, the joints are uneven, and the landscaper placed broken concrete pieces on the MOT1 base without compacting them before adding the semi‑dry mix. He cut the end‑slots off the channel drains, left gaps between sections, and installed loose end caps. Water leaks and flows towards the neighbour’s garden rather than the gully. A small 3×3cm opening was cut into the drain, but the gully grate remains in place, preventing access for clearing blockages. The landscaper claimed the drains would “move” if slotted together. The drain grilles sit 1–2cm below the DPC. I need guidance on whether this meets acceptable standards.

Callum · Answer

No it doesnt. That will be a rip out and start again
Best contact the worker and either he comes put right or go through his insurance 
Happy to come have a look just message me

Michael · Answer

Hi,
This does not sound very I’m afraid any paving should be a minimum of 150mm (15 centimetres) below the DPC on th house to prevent damp from rising.the paving sounds like it has not been primed in the back that is why they are lifting.The drains must be locked together and be connected to a suitable soak away or drain, the broken concrete is unexceptionable as a sub base voids will be created and will never compact correctly .
I hope this has been of some help to you.

Michael

Barbara · Answer

No that’s not acceptable get into come back and sort the problems although I’m afraid he may have to start all over again.

Terry · Answer

No this shouldn't be the case.The drain should be fully connected. And this requires to be taken out fitted properly.And as for the mot1 base , this should have been fully compacted prior to the slabs being laid As for the loose slabs, the reason why they're not staying is the ground is not compacted. So they will have nothing to bond to if they dont come and fix, this is looking like it needs to be lift and relayed

Patio and channel drain issues

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