Current
Core Supplement
Summarizes Approved Documents F, L & O for ventilation, energy efficiency, and overheating in new and existing dwellings. Approved Documents F defines three ventilation systems, setting minimum vent sizes and air permeability limits. Approved Documents L establishes U-values for windows and doors, mandates air sealing measures, and updates thermal performance calculations. Approved Documents O introduces overheating mitigation, categorizing locations by risk, limiting glazing areas, and specifying shading and ventilation to control solar gain. The guide also emphasizes background ventilation in window replacements and updates U-value calculations for doors and windows.
15th December 2021 edition
The Glass and Glazing Federation represents employers and companies in the flat glass, glazing, window, home improvement, plastics and applied window film industries in the UK.
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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