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Building envelopes
Specifications for building envelopes may be wholly bespoke or follow one of the recognised building envelope specifications.  However, all specifications have to be customised to take account of the external climate and the building use.

The CWCT ‘Standard for systemised building envelopes’ gives a framework for specifying building envelopes and provides a ‘Specifiers checklist’ showing information that will change from project to project.  This includes:

  • Internal and external environment
  • Air permeability
  • Thermal performance
  • Access and safety
  • Design life
Both the National Building Specification (NBS) and National House Building Council (NHBC) standards are based on the CWCT ‘Standard for systemised building envelopes’.  There are many British Standards relating to building envelopes but simply listing standards is no substitute for a comprehensive specification.

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