Thin hollow wall
Reducing the quantity of material used and making them less expensive has been possible because of advancement in the understanding of the materials of construction. Walls, these days, are built intelligently with a hollow space between the inner and the outer layers of the bricks without increasing the thickness of the walls. Quantity of the bricks is substantially reduced. The void in the walls reduces thermal conduction and keeps the house cool. The idea is to optimise the use of the materials and increase the sizes of rooms.
Source: hindu.comAdded: 22 August 2006