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Progress Report on BSI Committees Related to Natural Stone

Progress of the BSI Committees

Summary

Natural stone

Paving, setts & kerbs

B507 main committee

B507/2 natural stone paving, setts & kerbs

B507/4 accelerated aging in use - slip/skid resistance

B507/5 tactile paving

Masonry

Other BSI committees

Conclusion & recommendations

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Summary

The British Standard committees with responsibilities for natural stone have been very active during the last year. B507 has been involved in the development of European standards and in the draft of the parts of BS7533 that will provide the design guidance for the European specification standards.

B545 has also been active and has made progress on the much needed re-drafting of BS8298 – the code of practice for the design and installation of natural stone cladding and lining.

BRE has been actively involved in both of these committees and is currently taking the lead in the redrafting of BS8298.

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1. Progress of the BSI Committees

1.1 B545 Natural Stone

The main task for B545 has been the revision of BS8298 – Code of practice for the design and installation of natural stone cladding and lining. The current version of the code was issued in 1994 and at that time it was recognised that the document was very limited in its scope because it did not cover the newer types of cladding system. However, it was felt that there was insufficient experiences of the new systems and that this would make it difficult to produce a more wide ranging document. By 1999 it was clear that it was now possible to make a revised draft and BSI agreed that one should be produced.

Following discussion with industry it was agreed that the new document should be in six parts or sections. These are:

Part 1: General (Items common to all work)

Part 2: Traditional hand fixed stone

Part 3: Hand fixed to pre-cast concrete units

Part 4: Rain screen and prefabricated systems

Part 5: Internal Linings

Part 6. Fixing design and shape

Work on the first three parts is progressing well using the existing standard as a basis. Work on the other three parts is now beginning and it is hoped that an application will be made to DETR Support for Standards to fund a technical author to assist with the drafting of Parts 4 and 5. It is intended that Parts 1 to 3 will be available for public comment later in 2001.

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1.2 B507 Paving, Setts and Kerbs

1.2.1 B507 Main Committee

This committee has been very active during the last year with the drafting and publication of BS7533. This standard deals with pavements constructed with clay, natural stone or concrete pavers and it is being published in following parts:

Part 1: Guide for the structural design of heavy duty pavements constructed of clay pavers or precast concrete paving blocks;

Part 2: Guide for the structural design of lightly trafficked pavements constructed of clay pavers or precast concrete paving blocks;

Part 3: Code of practice for laying precast concrete paving blocks and clay pavers for flexible pavements;

Part 4: Code of practice for the construction of pavements of precast concrete flags or natural stone slabs;

Part 5: Guide for the design of pavements (other than structural aspects);

Part 6: Code of practice for construction of pavements — kerbs, channels and edgings;

Part 7: Code of practice for the construction of pavements of natural stone setts and cobbles;

Part 8: Guide for the structural design of lightly trafficked pavements of precast concrete flags and natural stone slabs;

Part 9: Code of practice for rigid laying of clay pavers;

Part 10: Design code for setts

Part 11: Maintenance

To date Parts 1,2, 3,4, and 6 have been published.

These standards provide detailed guidance on the design and installation of pavements in stone, clay and concrete. As such they link to the European Standards (BS EN 1341, etc. for paving, setts and kerbs in natural stone) which specify the materials to be used.

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1.2.2 B507/2 Natural Stone Paving, Setts and Kerbs

The main task of this sub-committee is to act as the ‘mirror’ committee to CEN/TC 178 WG2 – Natural stone paving, setts and kerbs. The non-harmonised ‘market’ European standards were published in 2000 and the harmonised versions are currently at formal vote. As a result it has not been necessary for this sub-committee to meet during the last year. However, a task group (B507/2/1) was established to revise the drafts of BS7533 Part 7 and BS7533 Part 10 on behalf of B507 (see above). This task group has met twice – in December 2000 and January 2001.

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1.2.3 B507/4 Accelerated Ageing in Use – Slip/Skid Resistance

Sub-committee B507/4 has been very active during the last year working on both British and European standards. The main documents are:

BS 7976. Method of calibration and operation of the pendulum tester. Draft standard.

This draft has been produced by another BSI committee but it was recognised that it potentially conflicted with BS 7932 (see below) and so B507/4 were asked to examine it in detail.

BS 7932:2000 Method of determination of Unpolished and the Polished Pendulum skid resistance value.

BS7932 was issued in 1998 after the proposed European Standard (prENV12633 was rejected – see below). After a period of use it was decided that the standard could be improved and so a revised version is being prepared that is in alignment with BS7976 and that also incorporates the latest views on polishing regimes.

prENV 12633 Test method for the accelerated polishing of paving units

This method was drafted at the request of CEN/TC178 but rejected in 1998 as being unreliable. Since then considerable effort has gone into developing the test and B507/4 has co-ordinated the UK input to this development. In particular, it has organised a series of round robin tests in the UK and in France, Netherlands and Germany and an inter-comparison of polishing systems in the UK. It is hoped that the revised draft will be submitted to CNE/TC178 during the second half of 2001.

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1.2.4 B507/5 – Tactile Paving

This committee was established in the middle of last year to address the requirement in a number of European mandates for flooring and paving for tactile surfaces – for example type of unit used in pavements adjacent to pedestrian crossings or at the edges of railway station platforms. This type of product is usual produced in clay or concrete but at least one company manufacturers them in stone. The sub-committee is looking at all materials since the requirements are the same. At present it is not clear if the document needs to specify the exact size, shape and layout of the raised areas of the units or just to provide tolerances. The first meeting of the sub-committee was in January 2001.

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1.3 B519/1 – Masonry

This committee undertakes a limited amount of work related to natural stone masonry. Recently it has been responsible for the UK input to the non-harmonised version of BSEN 771-6 Specification for natural stone masonry that was approved for publication. The committee is now looking at the revisions required to produce the harmonised version.

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1.4 Other BSI Committees

The committees related to aggregates and mortar have not met since last summer as the standards for which they are responsible are awaiting formal vote or they are already published. Details of the work of these committees can be found in BRE Report 79602 March 2000.

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2. Conclusion and recommendations

The British Standard committees with responsibilities for natural stone have been very active during the last year. B507 has been involved in the development of European standards and in the draft of the parts of BS7533 that will provide the design guidance for the European specification standards.

B545 has also been active and has made progress on the much needed re-drafting of BS8298 – the code of practice for the design and installation of natural stone cladding and lining.

BRE has been actively involved in both of these committees and is currently taking the lead in the redrafting of BS8298.

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