Introducing TG20:13
1
Introducing TG20:13
 Official launch - 22nd 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 TG20 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 TG20:13…
both within and outside the
construction sector.’
Stephen Ratcliffe,
Director UK Contractors Group
5
TG20 Compliant Scaffolding
 TG20 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
TG20 Compliant Scaffolding.
 TG20 compliant scaffolds were
previously referred to as ‘Basic’ or
‘Standard’ Scaffolds.
6
TG20 Compliance Sheets
 Demonstrates compliance
and that bespoke design is
not required.
 Typical Scaffolds included
in TG20:13 Operational
Guide (Chapter 03).
 Wider variations included
in the TG20 eGuide.
 Design advice must be
sought for any scaffold
outside the scope of a
TG20 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 TG20 Compliance Sheets
(chapter 3)
 A more accurate wind analysis is used in the
TG20 eGuide, which can result in increased safe
heights and reduced tie duties.
 Further advice is provided for designers in TG20
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
 TG20 Compliant Scaffolds only permits the
following types of tube to be used:
 BS EN 39 type 4 (4mm) galvanised steel
tubes or equivalent
 High-tensile galvanised steel tubes with a
diameter of 48.3mm, thickness of 3.2mm,
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
 BS2482 Timber board (softwood)
 BS2482 Board (with nail plate option)
 LVL Board (Laminated Veneer Lumber)  Composite Plastic Board
25
NASC Yearbook
 Summary in the TG20:13 article in the Yearbook
26
TG20 eGuide Demonstration
27
www.nasc.org.uk
28