These guys have been doing something similar for at least a decade (I have no financial interest etc.): http://www.timbercrete.com.au http://www.timbercrete.com

These guys have been doing something similar for at least a decade (I have no financial interest etc.): http://www.timbercrete.com.au http://www.timbercrete.com.au Also, I live in West Sussex and the amount of clay here really is unbelievable - my town used to be a major producer of clay and bricks, tiles etc. Once you're past a foot or so of topsoil it's pure clay.