Current
Core Supplement
Guidance for architects, contractors and others in the building supply chain about selecting appropriate steel windows for projects; including coverage of coupling bar spans and spacing; W20, W30, W40, SMW specifications; tubular profile windows and doors; thermal performance, strength, security and safety; installation, aftercare and maintenance.
Updated March 2014. Supersedes the 2010 version.
The Steel Window Association represents UK steel window manufacturers, they publish fact sheets for specifiers and installers of steel windows.
NBS has produced specification systems and information products for construction industry professionals for more than 40 years. The National Building Specification is the recognised UK national standard and is used by over 5,000 organisations. NBS is part of RIBA Enterprises Ltd.
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