Faux grass advice

[lmkitchens]

Hi, Ive recently been lanscaping the garden and have decided to go with a false turf as opposed to the real stuff! Ive had a local fitter round who has advised me that I need to flaten the ground and cover with sharp sand followed by geotextile barrier then the grass.

I have built a retaining surround from tanalised timber and the heigh internally varies from 1" to 3.5" in depth, I would imagine I dont want to be putting sharp sand down thicker than 1" - 1.5"?

If so what would be a good choice of aggreagte to bulk up the height? Its partially covering a soakaway so a hardcore I assume would not be advisable so maybe ballast?

Thanks in advance for the help!

 

[r896neo]

If it is restrained on all sides i'd fill it with clean stone. Don't really want all the sand in ballast filling up your soakaway.