Posted: Tue Feb 17, 2009 12:02 pm
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?
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?