TG20:13 update September 2014

Introduction The NASC is continuing to improve TG20:13, the comprehensive guide to good practice for tube and fitting scaffolding The first update to TG20, TG20:13 Supplement 1, launched in September 2014 It is accompanied by an update to the TG20:13 eGuide, version 1.1, now available for download from the NASC website

What’s new? A specification for TG20:13 compliant cold-formed high tensile steel tubes in TG20:13 Supplement 1 TG20 compliance sheets for cold- formed high tensile steel tubes in the new TG20 eGuide TG20 compliance sheets for sheeted scaffolds with transom units Several minor enhancements to TG20 compliance sheets

High tensile tubes TG20:13 provides a definition for TG20 compliant 3.2mm wall thickness high- tensile steel tubes to BS EN These tubes are manufactured by a hot- rolling process and offer performance comparable to type 4 steel tubes However, many 3.2mm high-tensile tubes used in the UK scaffolding industry are manufactured with a cold-formed process Although these tubes have a higher bending capacity than type 4 steel tubes, they did not comply with TG20:13 because they have a lower axial load capacity due to their reduced thickness

High tensile tubes TG20:13 has now been extended to support these tubes The required tube specification is defined in TG20:13 Supplement 1 New TG20 compliance sheets are available for tubes of this specification from the new TG20 eGuide

High tensile tubes TG20 compliance sheets for cold-formed high-tensile steel tubes are printed from the new version of the TG20:13 eGuide with this new option:

Transom units TG20 compliance sheets are now available for sheeted scaffolds constructed with TG20 compliant prefabricated structural transom units Compliance sheets are available for tied independent scaffolds and tied towers Printed from the new TG20 eGuide Guidance is provided in TG20:13 Supplement 1

Compliance sheet enhancements Some minor enhancements have been made to the TG20 compliance sheets from the new eGuide based on feedback A new note that ‘illustrations are indicative’ – the compliance sheet illustrations are not dimensioned design drawings Specific compliance sheets for scaffolds which are 2.0m, 3.0m or 4.0m tall Minor clarifications to the wording for scaffolds tied to the inner face only

Compatibility The NASC recommends that the latest TG20 compliance sheets from the new eGuide are always used However, this update to TG20 has been designed such that compliance sheets from the original eGuide (and from the TG20:13 Operational Guide) are still valid There is no need to differentiate between new and original compliance sheets on site

Software download Version 1.1 of the TG20:13 eGuide is available as a free software update Available for Windows, Mac and Android devices Download from the NASC website TG20:13 Supplement 1 is available for download as a PDF

Thank you Questions?