Clay Boards

Clay boards, which are an alternative to gypsum plas-terboards, are manufactured from clay and layers of reed along and across the board length. Hessian on both faces acts as reinforcement and a key for a 2-3 mm finish of lime-based or earth plaster. Joints should be scrimmed before skimming, although clay boards if sealed can be painted directly. The 25 mm boards may be used for drywall construction and ceilings, where they should be screw-fixed at 600 mm or 400 mm centres respectively.

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