Independent Tied ScaffoldsMaximum Height Some system scaffolds state a maximum height with standard brace and tying patterns. BS EN 12810 requires that system scaffolds have a minimum height for approval of: 25.5m for a sheeted scaffold 24m for an unclad scaffoldCISRS Basic Scaffold Inspection – Day 2 85 86Independent Tied ScaffoldsBay Lengths TG20 Compliance Sheets specify the maximum bay dimension. Bay lengths 2.4m to 1.8m depending on the duty Load classes 5 & 6 are subject to design. The calculations for the scaffold configuration will determine the bay width. System scaffold bay sizes differ considerably, always refer to the manufacturer’s instructions or design. CISRS Basic Scaffold Inspection – Day 2 Contractors should provide the client with the TG20 Compliance Sheet or design.CISRS Basic Scaffold Inspection – Day 2 Independent Tied ScaffoldsLift Heights To avoid major alterations access for brick and block work with 2m lifts, utilising inner platform brackets, allowing the inner platform to be raised or lowered by up to 0.5m.CISRS Basic Scaffold Inspection – Day 2 83 84Independent Tied ScaffoldsMaximum Height TG20 Compliance sheets will specify the maximum height (Chapter 3 or the eGuide). The main factor in determining the maximum height is the site location and wind loading for the configuration. These are available for from the eGuide.CISRS Basic Scaffold Inspection – Day 2 82 Independent Tied Scaffolds 81Lift Heights Typical lift height 2m, if walk‐through access is required. Except 1st lift up to 2.7m (see Pavement lifts later). Scaffolding be erected in progressively erected lifts for bricklaying or similar trades, lift heights are typically 1.35m to 1.5m (average working range).CISRS Basic Scaffold Inspection – Day 2Independent Tied ScaffoldsLift Heights TG20 compliant independent scaffolding can be erected with lift heights up to 3m, allowing floor height access, typically 2.5 – 2.8m. KN/m2) TG20 has compliant independent scaffolds to load classes 1‐4 TG20 uses similar descriptive duties as per BS 5973 (see table 1) TG20 compliant independent scaffolding can be constructed with inside boards or inside board brackets loaded to a maximum of 0.75kN/m2 Load classes 5 & 6 must be designed for Tube and Fitting scaffolds Note that some system scaffolds have standard configurations that include load classes 5 and 6, without the need for specific design.CISRS Basic Scaffold Inspection – Day 2 80
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