Curtain walling and cladding


Curtain walling and cladding systems shall be adequately tested, certified and designed in accordance with appropriate standards.

Curtain walling and cladding systems should have certification confirming satisfactory assessment, undertaken by an independent technical authority. Where applicable, certification should be in accordance with the CWCT Standard for systemised building envelopes (or a suitable alternative acceptable to NHBC). Independent technical approvals authorities acceptable to NHBC include:

  • British Board of Agrément (BBA)
  • Building Research Establishment (BRE), or
  • certification bodies considered by NHBC to be a suitable alternative.

Certification and test documentation should be:

  • made available to NHBC before work begins on site
  • used as reference to ensure compliance.

The use of the system should be within the scope of the certification and test documentation.