Seems the Styrofoam block method is convenient to the contractor and trendy but drawbacks:  http://www.wisehomedesign.com/icf-homes.html .


By comparison:

http://www.youtube.com/watch?v=KN8mvhzX9No

http://www.solarcrete.com/

http://www.superiorwalls.com/


http://www.thermomass.com