BS EN 771-1 : 2011

European foreword
1 Scope
2 Normative references
3 Terms and definitions
4 Materials and manufacture
5 Requirements for clay masonry units
6 Description, designation, designation code
  and classification of clay masonry units
7 Marking
8 Assessment and verification of constancy of performance
  (AVCP)
Annex A (normative) - Sampling for product type
        determination tests and for independent
        testing of consignments
Annex B (informative) - Additional information
Annex C (informative) - Guidelines for test frequencies
        for designing a FPC system to demonstrate conformity
         of finished products with the requirements of
         the standard and the declaration of the manufacturer
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 771-1:2011+A1:2015,
               BS 3921:1985 and BS 6649:1985

Gives the characteristics and performance requirements for masonry units manufactured from clay for which the main intended uses are protected or unprotected masonry structure (e.g. facing and rendered masonry, loadbearing or non-loadbearing masonry structures, including internal linings and partitions, for building and civil engineering).