BS EN 771-4 : 2011

European foreword
1 Scope
2 Normative references
3 Terms and definitions
4 Materials and manufacture
5 Requirements for AAC masonry units
6 Description, designation and classification of
  AAC masonry units
7 Marking
8 Assessment and verification of constancy
  of performance (AVCP)
Annex A (normative) - Sampling for product type
        determination test and for independent testing
        of consignments
Annex B (normative) - Cutting schemes
Annex C (informative) - Guidance on FPC frequencies
Annex ZA (informative) - Clauses of this European
         Standard addressing the provisions of the
         EU Construction Products Regulation
Bibliography
National Annex (informative) - Commentary on the
               differences between EN 771-4:2011+A1:2015
               and BS 6073-1:1981

Describes the characteristics and performance requirements of autoclaved aerated concrete (AAC) masonry units for which the main intended uses are different types of load bearing and non-load bearing applications in all forms of walling including single leaf, cavity, partitions, retaining, basement and general use below ground level, including walling for fire protection, thermal insulation, sound insulation and the fabric of chimneys (excluding chimney flue units).