Raw material resources surveys of the Clay Brick and Sand Gravel and Rock Products industries within the Metropolitan Area have shown that considerable production lag exists in relation to the deman for clay bricks, despite eight years post war production, and that the unfulfilled demand is being met in some measure by substitute construction materials, principally cement bricks, and roofing tiles, the manufacture of which is placing an abnormal demand upon the limited known sand resources within the Metropolitan Area. It is the purpose of this survey to show how, in relation to the comparatively static output of clay bricks, the output of cement bricks is steadily rising to meet a greater proportion of the unfullfilled demand for walling material in the building industry, and the significance of the sand requirement in relation to the overall output, from the limited known sand resources of the Metropolitan Area.