Census of India is the only source of Primary data. A huge number of People involved in Census Enumeration in a specified time period following the same procedure in all over India. I think one day in this year (2013), which will be an important day for Census may be celebrated as "CENSUS DAY" - Surajit dey

Use of different materials in the construction of roof at the country level is undergoing change. In rural India proportions of households using different materials are: Grass/ Thatch/ Bamboo/ Wood/ Mud, etc.: 20% (declined from 27.7% in Census 2001); Plastic/Polythene: 0.6% (increased from 0.4%); Tiles: 28.7% (declined from 37.5%); Burnt brick: 7.2% (increased from 5.6%); Stone/Slate: 8.9% (increased from 7.3%); G.I./ Metal/ Asbestos sheets: 15.9% (increased from 9.8%); Concrete: 18.3% (increased from 11%) and Any other material: 0.4% (declined from 0.6%).

Still 3.3 crore households in rural India live in houses with Grass/ Thatch/ Bamboo/ Wood/ Mud, etc. as roof. The number has reduced substantially since 2001 by about 49 lakh. The largest decline is reported from Uttar Pradesh (57 lakh).