The ground floor – removing cement and replacing it with limecrete
The cement floor was the biggest single problem. It had to be removed to make the building habitable, because headroom on the ground floor was well under 6 feet. The plan was to drop the floor 8 inches. The architects advised, and indeed the conservation officer insisted, on a limecrete floor, using expanded glass balls from power station waste as a lightweight filler instead of gravel. Underneath was a thick layer of a similar expanded glass, for insulation, and also to allow water to drain away quickly from beneath the building. The winter water table, as measured by the well outside, is less than half a metre below the floor.