The Work at Height Regulations 2005 state: “Strength and stability calculations for scaffolding shall be carried out unless it is assembled in conformity with a generally recognised standard configuration”.
Work at Height Regulations 2005 Schedule 2 Reg.7

European Standard BS EN 12811-1 is the current standard for scaffold erection but this does not contain a “standard configuration”, therefore all scaffolding structures built to BS EN 12811 require individual bespoke designs. Since this is not workable in practice, the National Access and Scaffolding Confederation (NASC), the recognised UK trade body, developed TG20 to reintroduce the concept of standard configuration of scaffolding. This is achieved by providing definitions for “TG20 compliant” scaffolding. TG20 compliant scaffolds are standard configurations of scaffolding that have been designed by structural calculation to BS EN 12811. Any scaffolding that can be shown to be erected in accordance with TG20 is therefore also in accordance with the design requirements of BS EN 12811 and exempt from further design.
Scaffold structures should therefore be constructed to BS EN 12811, which will require a structural design drawing, OR, the scaffold is to be identified as being “TG20 compliant” and constructed to TG20 compliance sheets, which need to be produced by the scaffolding contractor and provided to the ‘client’ requesting the scaffold.

TG 20 Compliance Sheets will assist site management to ensure that the scaffold that they have requested meets the strength and stability calculations for that scaffold. Scaffold contractors that state in their RAMS that they are constructing scaffold to BS EN 12811 and TG20:13 standards will have to provide either a Compliance Sheet or a Design drawing to show how the scaffold is to be erected. Like a design drawing the Complicate Sheet will give site management information such as: maximum height of scaffold, maximum loading, position and strength of scaffold ties etc.

TG20:13 and the HSE state that Scaffold Inspection training is a legal requirement for those who need to carry out statutory inspections of working platforms under the Working at Height Regulations. It is also essential for those managing scaffolding works on site, or providing shared access for various trades. Any person inspecting scaffold would have to prove competency to inspect scaffold.

PFP Safety Services has produced a 2 day Basic Scaffold Inspection course. The course delegates, on completion of the course, will be able to inspect basic scaffold as defined by industry guidance TG20:13 and produce a written report. Successful delegates will need to pass a multiple question theory test in addition to a practical inspection and report of a scaffold based on the knowledge they have required throughout the course.
This course is intended for Site Management and Supervisors who have an understanding of the Working at Height Regulations and of scaffold. Candidates must be able to produce evidence of having passed either the CITB SSSTS or SMSTS certificate within the past three years.