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BS 8298-4:2020

BS 8298-4:2020

$215.11

Design and installation of natural stone cladding and lining – Stone cladding on rainscreen support systems. Code of practice

Published By Publication Date Number of Pages
BSI 2020 74
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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:

  1. the provisions necessary for the stone cladding to perform its function satisfactorily; and

  2. 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.

It does not cover thermal insulation or the intermediate metal framing system.

PDF Catalog

PDF Pages PDF Title
5 Foreword
7 1 Scope
2 Normative references
8 3 Terms and definitions
12 Figure 1 — Birdsmouth joint
14 4 Stone selection process
4.1 General
15 4.2 Stone samples and testing
16 Table 1 — PCT testing of characteristics of panels for cladding
18 Table 2 — Stone testing regime in addition to the requirements of BS EN 1469
19 5 Designing rainscreen and stone on metal frame cladding systems
5.1 General
20 5.2 Movement in structures
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
31 5.10 Staining and changes in appearance
5.11 Cavities
32 5.12 Fixings
34 Figure 3 — Combined loadbearing and restraint fixings: Typical combined loadbearing restraint anchor
35 Figure 4 — Combined loadbearing and restraint fixings: Body anchor type loadbearing restraint fixings
36 Figure 5 — Back anchors: Undercut and expansion
Figure 6 — Kerfs and mortices
37 Figure 7 — Soffit fixings
Figure 8 — Use of dowels in soffit stone
41 Table 5 — Corrosion of metals in an industrial/urban atmospheric environment
43 Figure 9 — Glued and pinned corner
Table 6 — Length of return
44 Figure 10 — Solid L-shaped return
45 5.13 Jointing
47 6 Work practices in production
6.1 General
6.2 Sizes and tolerances
Table 7 — Tolerances for thicknesses
Table 8 — Tolerances for length, thickness and squareness for flat cladding panels
48 Table 9 — Tolerances for length, width and squareness for stoneA) other than flat cladding panels
6.3 Dowel holes, kerf slots and back anchors
Table 10 — Tolerances for the shape of dowel and kerf holes in production
6.4 Repairs
6.5 Marking
6.6 Production and storage
49 7 Work practices on site
7.1 Permissible deviations (construction tolerances)
Table 11 — Stonework joint tolerances
7.2 Movement and storage of materials
7.3 Fixings
50 7.4 Sealant-filled joints
7.5 Inspection of finished works
7.6 Protection
51 7.7 Site repairs
7.8 Cleaning on completion of work
8 Maintenance
52 Annex A (informative)  Sampling of natural stone: Sampling plan and report
53 Figure A.1 — Example sampling plan
54 Figure A.2 — Example sampling report
55 Figure A.3 — Sampling for representative samples
Annex B (normative)  Determination of panel thickness by calculation
56 Table B.1 — Indicative classification of wind load environments in the UK
59 Annex C (informative)  Worked example of flexural design and fixing breakout design checks
60 Table C.1 — Components of overall factor of safety
63 Annex D (normative)  Method of test for kerf clip or channel fixings under tensile load
64 Figure D.1 — Test arrangement for kerf clip or channel fixing under tensile load
65 Figure D.2 — Typical report format
Annex E (normative)  Method of test for undercut anchor fixings under tensile load
66 Figure E.1 — Test arrangement for undercut anchor fixing under tensile load
67 Annex F (normative)  Method of test for undercut anchor fixings in shear
68 Figure F.1 — Test arrangement for undercut anchor fixings in shear
69 Annex G (normative)  Method of test for undercut anchor fixings under combined tensile and shear load
70 Figure G.1 — Test arrangement for undercut anchor fixings under combined tensile and shear load
71 Bibliography

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BS 8298-4:2020
$215.11