BS 8298 updated to improve consistency

BS 8298 updated to improve consistency

February 2021

BS 8298, the Standard that covers the Installation of Natural Stone Cladding and Lining, has recently been updated.  TSJ reports on the significant redrafting of this essential document.

On 17th December 2020, the update of BS 8298, the Standard that covers the installation of natural stone cladding and lining, was published.

It replaces the previous BS 8298 originally published in 2010. The 2010 Standard consisted of four parts. This has now been reduced to three parts, parts 2, 3 and 4, which cover hand setting, stone precast, and rainscreens.

The main aim of the revision was to provide more consistency with other material design Standards, with values derived from industry experience and a historical precedent of conformity and not a reliability-based analysis.

It is the long-term goal for partial safety factors to be derived from a reliability-based analysis in accordance with the principles of BS EN 1990:2002+A1, Annex D.

This revised and significantly updated suite of standards provides guidance for all those involved in the selection, design and installation of natural stone cladding and is a must-have British Standard.
This is a full revision of the Standard and introduces the following principal changes:

  • The incorporation of the recommendations for production control testing from BS 8298-1:2010
  • The addition of several figures to illustrate key details
  • The structural design of the stone has been updated to follow the principles of limit state design

What has changed?
At an early stage, the Standard requires the structural engineer and architect designing the building to set out and agree, with those selecting and designing the cladding and its fixing, the functional requirements governing design principles, and maximum movement allowance.

The suite of Standards also set out the testing required, the sampling regimes to be followed, and the provision of the Declaration of Performance and UKCA marking.

Readers should note that, as per the News item in TSJ, January 2021, UKCA marking has replaced the European CE Marking which remains acceptable until 31/12/21.
The Standards also provide guidance for work practices in production and on-site.

Stone Federation members, and members of the Stone Federation Architects’ Club, can access free technical advice from the Stone Federation, around these changes.

Detailed below are the key changes, as identified by the Stone Federation, for each part of the new Standard.

BS 8298-2:2020
Design and installation of natural stone cladding and lining.
Traditional handset external cladding.
Code of practice.

This part of BS 8298 gives recommendations for the design, installation and maintenance of traditional handset external cladding of natural stone held directly to a structural backing structure by metal fixings.
It covers:

  • The sampling of stone for testing and production control testing (PCT)
  • The provisions necessary for the cladding to perform its function satisfactorily
  • The materials and methods most frequently used for stonework
  • The use of thermal insulation behind external cladding.

BS 8298-3:2020
Design and installation of natural stone cladding and lining.
Stone-faced precast concrete cladding systems.

Code of practice.

This part of BS 8298 gives recommendations for the design, installation and maintenance of natural stone directly attached to precast concrete units (i.e., stone-faced concrete cladding units as defined in BS 8297).

BS 8298-4:2020 Design and installation of natural stone cladding and lining.
Stone cladding on rainscreen support systems.

Code of practice.

This part of BS 8298 gives recommendations for the design and fixing of individually supported panels of natural stone, with or without an intermediate metal framing system, as part of a rainscreen cladding system, including vertical elements and sloping elements (i.e. soffits) of the facade, as well as soffit and coping units.
It covers:

  • The provisions necessary for the stone cladding to perform its function satisfactorily
  • The methods most frequently used for assessing the suitability of the stone.

It does not cover aggregate/agglomerated stone, stone veneer composite (e.g., stone on honeycomb, stone on ceramic, stone on a lightweight concrete) or terracotta panels used as external cladding.
To find out more about the changes and details of each part of the Standard, Stone Federation members can email technical@stonefed.org.uk.

About the standard
BS 8298-3:2020 Design and installation of natural stone cladding and lining provides recommendations for the design, installation, and maintenance of natural stone directly attached to precast concrete units. It details selection, testing, thickness of stone, jointing and pointing, dimensions, work practices in production, and on site.

It supersedes BS 8298-1:2020 and BS 8298-3:2010, and came into effect 31 December 2020. Price £280.00

Related publications
BS 8298-3:2020
Design and installation of natural stone cladding and lining
Stone‑faced precast concrete cladding systems.
Code of practice

BS 8298-4:2020
Design and installation of natural stone cladding and lining
Stone cladding on rainscreen support systems.
Code of practice

BS 8298 is published by the British Standards Institution
389 Chiswick High Road
London W4 4AL
W: www.bsi-global.com/
E: cservices@bsi-global.com
T: 020 8996 9000

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