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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:
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Internal and external environment
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Air permeability
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Thermal performance
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Access and safety
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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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