Hi Tony
I'm laying a 17m x 7m gravel drive onto solid clay here in france. I've been told it's a good idea to lay sheets of a textile called BIDEM on the clay before we lay the first layer of substrate. The local material for substrate is 30/50 broken chalk and the bidem stops the chalk and clay combining. I know some people don't do this - do you think it's necessary?
Gravel drive - Using a layer of textile
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