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Screeds, bases and in situ floorings - Polymer modified cementitious levelling screeds and wearing screeds. Code of practice Ingestion-build-156411 Alarm systems - Alarm transmissionBS 8204 3: 2004 + Amendment 2: 2011 Screeds, bases and in situ floorings. Polymer modified cementitious levelling screeds and wearing screeds. Code of practice BS 8204 3 gives recommendations for the design and installation of trowel finished polymer modified cementitious levelling screeds and wearing screeds. It applies where the proportion of polymer solids based on the mass of dry cement is at least 4 %, as bonded screeds applied to direct finished