India - Housing Condition Survey, July - December 2002, NSS 58th Round

Information on the basic building materials with which the floor, walls and roof of the dwelling unit are constructed will be collected and recorded in codes against items 21, 22 and 23, respectively. When the basic building materials used are different for different walls, the materials used for major portion of wall area of the dwelling will be the wall type. For determining the wall type, only the walls of the dwelling will be considered. Roof / floor type will also be determined on the basis of the material used for major portion of roof / floor area of the dwelling, if the different portions of the roof / floor are made of different building materials. For determining the material of the roof, the material of which the outer roof exposed to the weather (and not the ceiling) is made i.e. tiles, thatch, corrugated iron, zinc or asbestos sheet etc. will be considered. However, if the roof is mainly made of bricks, tiles, stone etc. with the mud, cement or lime plaster exposed to the sky, the material of roof will not be mud, cement, lime etc. but it will be brick, tile, stone etc. which constituted the fabric of the roof.