corners of the site.
The layer of black bricks is the first real sign of this house being different - you can see them a bit clearer here.
They are described as "the insulation block that thinks it's a brick" and are made of 33% new and 66% recycled glass mixed with carbon. The company that makes them is in Reading and if you want the technical spec you can check out their site at http://www.foamglas.co.uk/building/home/.
These bricks basically form an insulation layer that stops the cold from the ground getting into the walls.