Embodied Energy Per cm Thickness per m2 Wall (MJoule/cm)

Concrete   45.6    
Red Brick   43.8    
Lightweight/AAC Brick   21.1    
EPS (plastic)   10.6    
         
Wall Thickness : cm
Assumptions:
Plaster thickness: Red brick 1.5 cm, AAC brick 1 cm, b-panel® 3 cm, b-Lite® 2 cm

Source:
http://www.yourhome.gov.au/materials/embodied-energy
http://en.wikipedia.org/wiki/Embodied_energy