The National Building Specification (NBS) is one of the most widely used
frameworks for specifying construction in the UK. It provides architects
with specification clauses that match the architectural packages of work.
NBS Section H11 – Curtain walling invokes the CWCT Standard for curtain
NBS Section H92 – Rainscreen cladding invokes the CWCT Standard for walls
with ventilated rainscreens
Further details of the National Building Specification are available