Baked bricks were commonly used in the construction of houses in Indus cities. The ratio of the brick measurements (H:W:L) was standardized to 1:2:4, which allowed mass production and efficient construction. Many of the baked bricks at Mohenjo daro are now suffering from the effects of salination (the salt from the ground water dries and crystallizes within the bricks and causes them to crumble) and the conservation of the site is currently being conducted by UNESCO.