Artificial grass base, max height of sand layer?

22 Sep 2018
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United Kingdom

so in preparation for an artificial lawn, I’ve dug up my lawn, levelled it as much as possible and added 50mm of compacted type 1. This weekend I have laid a slab path through the centre of the lawn. Next step is to lay the binding sharp sand layer.

I would like the artificial grass base to be just below the finish height of the slabs. Problem is, this would require a sand layer of between 50mm-65mm (20mm slab + 30mm-45mm cement bed).

Is this too thick a layer of sharp sand?
Do I need to compact more type 1 before sand?
Could I have a achieve this height if I used granite dust instead?

many thanks for your help.
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