Interviewer instructions
If there is more than one type of material used for walls, the interviewer will record the main one. If there is not a
significant main one, the interviewer will record the one of highest value. You do not need to ask this question if it is obvious by looking around. But if, for example, the walls are plastered you need to ask what material is behind the plaster. If the material behind the plaster is of higher value, you should choose the higher value one.
In case the walls of the dwelling seem to be build out of grass, you should figure out which material supports the grass and select that material in the list. It can not be that grass stands on its own, so the response cannot be 'grass'. You will notice that in Moshi there is a unique type of building walls materials. There is a kind of bricks that look strong but not baked. They are sliced out of naturally compacted gravel. This type of walls should be classified under 'burnt brick', i.e. code [3].