National Structural Steelwork Specification

The 6th Edition of the National Structural Steelwork Specification for Building Construction (NSSS) has now been released.

The NSSS is the national standard for specifying structural steelwork for use in building.

The 6th edition supersedes the 5th edition (CE Marking version) of the NSSS and tender
documentation and construction contracts should be changed to reference the 6th edition of the
NSSS for the steelwork specification.

The 6th edition can be used for all types of building construction designed for static loading and is
based on Execution Class 2 structural steelwork designed in accordance with BS 5950-1 or
BS EN 1993-1-1 (including BS EN 1993-1-8 and BS EN 1993-1-10) and executed in accordance
with BS EN 1090-1 and BS EN 1090-2.

The main changes between the previous 5th edition (CE Marking version) and the 6th edition are:

Various clauses throughout the NSSS have been modified to make it clear that under the
Construction (Design and Management) Regulations 2015 all parties have a duty to
cooperate with others involved in the construction of the Works

Additional definitions for terms used in Building Information Modelling (BIM) have been
added and Sections 1 and 3 of the NSSS have been updated to include the BIM information
required and provided by the Steelwork Contractor

UK suppliers and distributors of structural fasteners shall comply with National Highways
Sector Scheme 3 (NHSS3) or an equivalent quality management system

BS EN 1993-1-10 ‘Design of steel structures. Part 1.10 Material toughness and throughthickness
properties’, allows fracture mechanics to be used to determine toughness
requirements. This approach has been included in Section 2.2.5 as an alternative to selecting
the steel qualities according to Table 2.2

The tables for specifying ordinary and preloaded bolt assemblies have been updated and
include additional tables for ordinary tie-bar assemblies and matching ordinary tie-bar

Clause 4.1.1 on the traceability of steel products and in particular the meaning of ‘Partial’
traceability has been clarified

A new Clause 4.11 has been added which describes the method for adding together
permitted deviations

Clause 5.3.2 has been modified to allow the Responsible Welding Coordinator to act as the
examiner/examining body for the approval of welding procedure provided suitable
competence can be demonstrated

Clause 5.6 on the welding of shear studs has been revised and includes requirements for
initial type testing and routine testing

A new Clause 11.5 on modifications has been added to make it clear that any proposals to
improve or modify the work shall be considered and confirmed by the engineer prior to the
modifications being carried out

References to British Standards (issued with BS, BS EN, BS EN ISO or BS ISO references)
have been updated throughout the specification.

Copies of the National Structural Steelwork Specification for Building Construction 6th Edition
(BCSA Publication No. 57/17) can be obtained from BCSA
This book is only available in PDF format.

£20 for Non-members
£15 for BCSA members

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