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BS 8298-2:2020

BS 8298-2:2020

$215.11

Design and installation of natural stone cladding and lining – Traditional handset external cladding. Code of practice

Published By Publication Date Number of Pages
BSI 2020 78
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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:

  1. the sampling of stone for testing and production control testing (PCT);

  2. the provisions necessary for the cladding to perform its function satisfactorily;

  3. the materials and methods most frequently used for stonework; and

  4. the use of thermal insulation behind external cladding.

Loadbearing masonry or cladding held only by adhesion is not covered, nor is any type of cladding supported or held in position around the perimeter of stones or series of stones by metal framing (e.g. rainscreen). This document is not applicable to seismic loading or enhanced security scenarios (such as blast).

NOTE The general principles for cladding also apply to soffits and sloping surfaces.

Different cladding and lining methods are covered in the other parts of BS 8298 (see Foreword).

PDF Catalog

PDF Pages PDF Title
5 Foreword
7 1 Scope
2 Normative references
9 3 Terms and definitions
12 Figure 1 — Birdsmouth joint
13 4 Stone selection process
4.1 General
14 4.2 Stone samples and testing
16 Table 1 — PCT testing of characteristics of panels for cladding
17 Table 2 — Stone testing regime in addition to the requirements of BS EN 1469
18 5 Designing external cladding
5.1 General
19 5.2 Movement in structures
20 Table 3 — Origins of movement in structures
5.3 Deflection limits
5.4 Loading
21 5.5 Material strength
23 5.6 Factors of safety
26 Table 4 — Components of overall factor of safety
27 5.7 Impact
29 5.8 Water run-off and management
30 Figure 2 — Water run-off and management
5.9 Damp-proof courses and cavity trays
5.10 Staining and changes in appearance
31 5.11 Cavities
32 5.12 Methods of attachment and support
33 Figure 3 — Loadbearing fixing: Section through typical loadbearing angle
35 Figure 4 — Restraint fixing at compression joint
36 Figure 5 — Typical restraint fixings
Figure 6 — Face fixing
37 Figure 7 — Three-way adjustment of fixings
39 Table 5 — Corrosion of metals in an industrial/urban atmospheric environment
40 Figure 8 — Loadbearing fixing
42 Figure 9 — Loadbearing fixing
43 Figure 10 — Position of restraint fixings
45 Figure 11 — Use of plates and dowels in soffit stone
48 Figure 12 — Glued and pinned corner
Table 6 — Length of return
49 Figure 13 — Solid L-shaped return
50 5.13 Jointing and pointing
53 6 Work practices in production
6.1 General
54 6.2 Sizes and tolerances
Table 7 — Tolerances for thicknesses
Table 8 — Tolerances for length, thickness and squareness for flat cladding panels
Table 9 — Tolerances for length, width and squareness for stoneA) other than flat cladding panels
55 6.3 Dowel holes and mortices
Table 10 — Tolerances for the shape of dowel holes in production
6.4 Marking
6.5 Production and storage
7 Work practices on site
7.1 Permissible deviations (construction tolerances)
Table 11 — Stonework erection tolerances
56 Table 12 — Stonework joint tolerances
7.2 Scaffolding
7.3 Movement and storage of materials
57 7.4 Fixings
7.5 Bedding, jointing and sealing of joints
7.6 Movement joints and compression beds
7.7 Inspection of finished works
7.8 Protection
58 7.9 Site repairs
7.10 Cleaning on completion of work
8 Maintenance
8.1 General
59 8.2 Compression and movement joints
8.3 Pointing
8.4 Lime bloom
60 Annex A (informative)  Sampling of natural stone: Sampling plan and report
61 Figure A.1 — Example sampling plan
62 Figure A.2 — Example sampling report
63 Figure A.3 — Sampling for representative samples
Annex B (informative)  Example of calculation of thermal movement
64 Annex C (normative)  Method of test for kerf clip or channel fixings under tensile load
65 Figure C.1 — Test arrangement for kerf clip or channel fixing under tensile load
66 Figure C.2 — Typical report format of tensile load of kerf clip or channel fixings
Annex D (normative)  Determination of panel thickness by calculation
67 Table D.1 — Indicative classification of wind load environments in the UK
70 Annex E (informative)  Worked example of flexural design and fixing breakout design checks
71 Table E.1 — Components of overall factor of safety
75 Bibliography

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BS 8298-2:2020
$215.11