Introducing TG 20 13 1 Introducing TG 20

Introducing TG 20: 13 1

Introducing TG 20: 13 Official launch - 22 nd November 2013 at the NASC AGM, Bristol ‘A comprehensive guide to good practice for tube and fitting scaffolding’ 2

Work at Height Regulations 2005 Schedule 3 – part 2 additional requirements for scaffolding 7) Strength & stability calculations for scaffolding shall be carried out unless… a) A note of calculations, covering the structural arrangements contemplated is available; or, b) It is assembled in conformity with a generally recognised standard configuration. 3

HSE Support ‘The Work at Height Regulations 2005 require that strength and stability calculations are carried out for scaffolds unless they conform to a recognised standard… …HSE is pleased to acknowledge that TG 20 has been written by NASC to provide such a standard…’ Heather Bryant, Chief Inspector of Construction Health and Safety Executive 4

UKCG Support ‘We applaud and support the work of the NASC which will no doubt result in safer scaffolding… The UKCG recommend the adoption and standardised use of TG 20: 13… both within and outside the construction sector. ’ Stephen Ratcliffe, Director UK Contractors Group 5

TG 20 Compliant Scaffolding TG 20 compliant scaffolds have been designed by structural calculation in accordance with BS EN 12811. Design advice should be sought for any scaffold outside of the scope of TG 20 Compliant Scaffolding. TG 20 compliant scaffolds were previously referred to as ‘Basic’ or ‘Standard’ Scaffolds. 6

TG 20 Compliance Sheets Demonstrates compliance and that bespoke design is not required. Typical Scaffolds included in TG 20: 13 Operational Guide (Chapter 03). Wider variations included in the TG 20 e. Guide. Design advice must be sought for any scaffold outside the scope of a TG 20 Compliance Sheet. 7

Simplified Wind Classifications Wind exposure affects the maximum height and tie duty, especially when sheeted or netted. A simple wind exposure classification illustrated here is used with the TG 20 Compliance Sheets (chapter 3) A more accurate wind analysis is used in the TG 20 e. Guide, which can result in increased safe heights and reduced tie duties. Further advice is provided for designers in TG 20 Design Guide. Wind exposure is classified as ‘moderate’, ‘high’ or ‘extreme’ Other factors to be considered are ‘site topography’, ‘seasonal variations’ and ‘wind shielding in cities’ 8

Compliant Scaffolding Types Tied Independent Scaffolding 9

Compliant Scaffolding Types Towers 10

Compliant Scaffolding Types Interior Access Birdcage Scaffolding 11

Compliant Scaffolding Types Tied Putlog Scaffolding 12

Compliant Scaffolding Types Free-standing Independent Scaffolding 13

Compliant Scaffolding Types Loading Bay 14

Compliant Scaffolding Types Ladder Access Tower 15

Compliant Scaffolding Types Chimney-stack Scaffolding 16

Compliant Scaffolding Features 17

Compliant Scaffolding Features Bridging with Beams 18

Compliant Scaffolding Features Prefabricated Transom Units 19

Compliant Scaffolding Features Light duty protection fans 20

Compliant Scaffolding Features Pavement Lifts 21

Compliant Scaffolding Features Cantilevered Access Platforms 22

Compliant Scaffolding Features Inside Board Bracket Platforms 23

Tube TG 20 Compliant Scaffolds only permits the following types of tube to be used: BS EN 39 type 4 (4 mm) galvanised steel tubes or equivalent High-tensile galvanised steel tubes with a diameter of 48. 3 mm, thickness of 3. 2 mm, in accordance with BS EN 10210 -1 The following types may not be used without design: BS EN 39 type 3 steel tubes Aluminium tubes Other dimension, material or grade 24

Scaffold Boards Platforms constructed from timber boards or decks of other materials BS 2482 Timber board (softwood) BS 2482 Board (with nail plate option) LVL Board (Laminated Veneer Lumber) Composite Plastic Board 25

NASC Yearbook Summary in the TG 20: 13 article in the Yearbook 26

TG 20 e. Guide Demonstration 27

www. nasc. org. uk 28