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Lime-ash floors

- lime-ash is a composite material, made up of the waste from lime kilns sifted and combined with gypsum (calcium sulphate), which was used for flooring. Strong, durable relatively light and with good warmth and sound insulation properties, lime ash was used in the upper floors of buildings from the 15th through to the last part of the 19th century. The material was laid on a supporting bed which was attached to timber joists. Confined mainly to the limestone belt of middle England, these floors can be very important to the historic character of a building.