BS 8204-1:2003+A1:2009

This part of BS8204 gives recommendations for constituent materials, design, work on site, inspection and testing of concrete bases that are to receive in situ wearing screeds of the following types: concrete (see BS8204‑2); polymer modified cement (see BS8204‑3); terrazzo (see BS8204‑4); mastic asphalt (see BS8204‑5); synthetic resin (see BS8204‑6); magnesium oxychloride; pumpable self-smoothing screeds (see BS8204‑7); and for bases and levelling screeds that are to receive flexible floor coverings such as: textiles; linoleum; polyvinyl chloride; rubber; cork; and rigid floorings such as: wood block and strip; laminate floor coverings; ceramic tiles; natural stone. It applies to ground-supported and suspended concrete floor bases. This part of BS8204 includes the use of concrete and levelling screeds made with lightweight aggregates conforming to BSEN13055‑1. Where the recommendations differ from those for normal weight aggregates, these are given in AnnexA. Recommended methods for the assessment of levels and surface regularity and for the determination of in situ crushing resistance (soundness) are given in AnnexC, AnnexD and AnnexE. This part of BS8204 is not intended to provide guidance on the structural design or related construction of concrete ground-supported floors or suspended slabs. Information on these aspects is given in BS8110‑1 and reference [4]. The specification of concrete for base slabs is given in BS8500‑2. The recommendations in this code of practice relate to those other aspects of design and construction of concrete slabs that affect the performance of the overlying levelling or wearing screed. NOTE BS8110‑1 is obsolescent and will be superseded by BSEN1992‑1‑1:2004 in March 2010. See Part3 for polymer modified cementitious levelling screeds.