System scaffolds outside users guide parameters.Protection fans, Nets and Pavement Frames.Offshore scaffolds outside Offshore Contractors Association (OCA) handbook.Towers requiring guys or ground anchors.Free standing scaffolds outside base/height Limitations.Mobile and static towers outside base/height limitations.Temporary roofs and temporary buildings.Access scaffolds with more than the 2 working lifts allowed with TG20 ‘Basic Scaffolds’.Scaffold structures that need to be designed You can argue the configuration does not require a design as it is TG20 compliant but if they want a design then you’ll have to do one anyway! Besides, there aren’t many large Contractors who would allow scaffolds to be erected on CDM sites without one, as they are often used for their own H&S and TWC management and they often need them to co-ordinate all trades who will be using the scaffold. Although your configuration may meet all the criteria, our guidance is – What does your Customer want? TG20:08 is very specific and prescriptive in the requirements of scaffolds which can be erected without further design such as where they are, the wind load on them, a maximum of 2m bays, a maximum of 2m lifts and whether they are netted or sheeted etc. Unfortunately this has added to the confusion. In addition to this, it reproduces a number of design tables from which the intention is certain configurations of scaffold, if meeting the configuration arrangement, do not require any further design. TG20:08 attempts to interpret the requirements of BS and provides guidance notes for good practice in the design and erection of scaffolds. ‘TG20:08 A guide to good practice for Scaffolding with Tubes & Fittings’ is a document derived from ‘BS EN 12811 Temporary Works equipment – Scaffolds’ – the British Standard for the design and erection of scaffolds.

Confusion arises from the existence of TG20 guidance documents and historical practice within the industry.

Hanging scaffolding design