Regulation 7 Materials and workmanship
So much of any building work as is required to comply with any relevant requirement of Schedule 1 shall be carried out–
with proper materials which are appropriate for the circumstances in which they are used; and
in a workmanlike manner.
Subject to paragraph (1), “proper materials” shall include materials which–
bear an appropriate EC Mark in accordance with the Construction Products Directive; or
conform to an appropriate harmonized standard or European technical approval; or
conform to an appropriate British Standard or British Board of Agrément certificate; or
conform to some other national technical specification of any member State which provides, in use, an equivalent level of protection and performance, with respect to the relevant requirements of Schedule 1, as an appropriate British Standard or British Board of Agrément certificate.