Structural Insulated Panels (SIP) Environmental Energy Solutions
SIP is less prone to shrinkage and has a significantly higher thermal performance with a potential u-value as low as 0.18 with a 125mm panel.
SIP is also extremely recyclable, and whilst we are aware that polyurethane insulation is not highly favoured by the deep-green environmentalists, we have not found an alternative which can address a real multiple housing need, (it is unrealistic to expect social housing to be made from straw bales & sheeps wool).
Having said the above, we are watching the development of open clay brick construction closely.