Withdrawn, Document not available for download
Core Supplement
Technical Extra
Subdivided into four sections: NHBC Standards; regulation and compliance; guidance and good practice; information and support. Covers: minimum foundation depths in clay soils; ironmongery for windows and doors; update on airtightness testing; ensuring adequate ventilation to naturally ventilated dwellings; guarding to openable windows with low cill heights; design and use of autoclaved aerated concrete masonry units; CE marking for steelwork fabrications; pre-start meetings and risk guides; provision of fire protection to proprietary dummy chimneys over party walls; robust details animated training videos; NHBC Foundation news; provision of weep holes and weep vents in masonry walls. Also includes: technical news, information and support.
Withdrawn January 2024. Technical Extra publication replaces Standards Extra and Sustainability Extra.
Formed in 1936, the NHBC is the standard setting body for new and newly converted homes 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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