Contains section sizes and spans for solid timber members in floors, ceilings and roofs (excluding trussed rafter roofs) for dwellings. The calculations apply to buildings up to three storeys in height above ground level. These tables were originally included in the England and Wales Building Regulations, Approved Document A: Structure. Tables are included for domestic floor joists, ceiling joists and binders, and rafters and purlins supporting rafters for traditional pitched roofs. Calculations are also given for purlins supporting roof sheeting or cladding, and for flat roof joists. The tables cover softwood species and grade combinations which satisfy strength classes C16 and C24, and comply with current regulations and standards. Revised to cover enhanced shear strength, enhanced bearing strength, trimmer tables and there are changes to some section sizes.
First edition published in 2004 and reprinted with amendments in 2005. Second edition published and reprinted in 2008. Third edition published in 2009 and reprinted with corrections (no changes to spans) in 2010, 2012, 2013, 2014. This document has been split into parts for ease of use.
TRADA Technology is an independent consultancy company and prior to 1994 was wholly owned by TRADA. It is now a member of the BM TRADA Group of companies and is the appointed provider for research and information programmes and for the administration of its member services. Providing a wide range of commercial and training services to TRADA members and to the timber and construction industries. Key publications include a wide range of Wood Information Sheets for specifiers, Span tables, Eurocode 5 guidance, Construction briefings and technical manuals on timber frame, cladding, decking, green oak, high performance windows, flooring installation and timber in refurbishment.
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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