RJRB Posted January 15, 2013 Share Posted January 15, 2013 My sons first floor flat also has a fine sand above his ceiling and under the floor of the flat above. We found this out when fitting new ceiling lighting and there was a constant stream like an egg timer. It used to be an old church hall and meeting rooms,and we also believe it is there as insulation. Link to comment Share on other sites More sharing options...
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