I wonder if have anyone thought about maybe using earth as insulation system for Timber Frame?? I have looked into SIPs and find it to be more expensive than it was few years at $5 to $8 per SQFT. I looked into spraying foam but there is too many stuff out there that it is just too various. When I was posting entry in my facebook, a guy suggested me to consider earth so I googled it up and told him I am not sure about it?? He sent me a link and it kinda got me very curious. http://www.calearth.org The only thing that is uncertain to me would be whether the roofing of TF can actually support this type of insulation?? Maybe as a siding then SIPs or spray foam insulation for roofing??

What is your take???