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TG20:08 is a guide to good practice for tube and fitting scaffolding published by the NASC, the National Access and Scaffolding Confederation. It is based on BS EN 12811-1, which is the British and European standard for tube and fitting scaffold design.TG20:08 defines a range of 'basic scaffolds' for which a structural design has been performed by the NASC, and for which a further design is not required. These standard designs are provided in the form of tables of safe height and tie duty values.
If an independent or putlog scaffold conforms to the TG20 definition of a 'Basic Scaffold' then it does not require a formal structural design if its height is within the safe height provided by TG20:08. The tie duty advises whether light, standard, or heavy duty ties are required, and also advises of cases where extra ties need to be applied. 'SMART Scaffolder check IT performs TG20:08 checks automatically. The 'basic scaffold' checks are performed and if these checks pass then the safe height and required tie duty are calculated.'
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