How do I stick uncoupling mats to anhydrite screeds and gypsum floorboards? How do I stick uncoupling mats to anhydrite screeds and gypsum floorboards?

How do I stick uncoupling mats to anhydrite screeds and gypsum floorboards?

Before sticking an uncoupling mat to an anhydrite (or gypsum or calcium sulphate) screed, you must first ensure it is dry and suitably prepared; please refer to our How do I tile to anhydrite screeds? FAQ for further guidance. In the case of both anhydrite screeds and gypsum floorboards, they must then be primed with a single coat of ARDEX P 51diluted 1:3 with water, applied in one continuous coat using a brush or broom. Once the ARDEX P 51is dry, the uncoupling mat should then be fixed using ARDEX AF 200 PLUS or the appropriate ARDEX Cement-Based Tile Adhesive.

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