BS 8298:1994

Committees responsible
Foreword
Code of practice
Section 1. General
1.1 Scope
1.2 References
1.3 Definitions
1.4 Exchange of information and time schedules
Section 2. Materials and components
2.1 Cladding stones
2.2 Stone face concrete cladding units
2.3 Fixings
2.4 Materials for mortar
2.5 Damp-proof courses, flashings, weatherings and
      cavity trays
2.6 Sealants
2.7 Back-up materials
Section 3. Design
3.1 Introduction
3.2 Insulation behind cladding
3.3 Weathering and water run-off
3.4 Atmospheric pollution
3.5 Frost action
3.6 Efflorescence of buildings
3.7 Staining
3.8 Choice of stone
3.9 Thickness of stone
3.10 Methods of attachment and support
3.11 Jointing and pointing
3.12 Flashings and weatherings
3.13 Accommodation of dimensional changes
3.14 Permissible deviations
3.15 Handling and lifting facilities
3.16 Signs
Section 4. Workmanship in production
4.1 General
4.2 Sizes
4.3 Mortices
4.4 Marking
4.5 Production and storage
Section 5. Workmanship on site
5.1 General
5.2 Supervision
5.3 Scaffolding
5.4 Temporary headtrees
5.5 Moving and storage of materials
5.6 Bedding, jointing and sealing
5.7 Flashings and weatherings
5.8 Protection
5.9 Site repairs
5.10 Cleaning on completion of work
Section 6. Maintenance
61. General
6.1 Compression and movement joints
6.3 Pointing
6.4 Lime bloom
6.5 Granite
6.6 Marble
6.7 Slate and quartzite
6.8 Limestone and sandstone
Annex
A. (informative) Subjects included in BS 8200 Code of
    practice for the design of non-loadbearing external
    vertical enclosures of buildings
Tables
1. Maximum masses per square metre of cladding stones
2. Damp-proof courses
3. Flashings, weatherings and cavity trays
4. Thickness of stone and depth of slot for corbel
     plate
5. Recommendations for the prevention of bimetallic
     corrosion
6. Specified minimum mechanical properties in BS 970:
     Part 1 and BS 1449: part 2 and recommended working
     stresses
7. Mechanical properties of austenitic stainless steel
     fasteners to BS 6105
8. Working stresses for bolts in clearance holes
9. Minimum effective penetration requirements for
     expanding bolts
10. Normal minimum width of joints
11. Choice of sealants
12. Origins of movement in structures
13. Coefficients of thermal expansion of building
     materials
14. Extreme temperatures of UK structures
15. Rate of shrinkage of concrete (as a percentage of
     its potential)
Figures
1. Illustration of stone thickness and mortices given
     in table 4
2. Illustration of typical loadbearing fixings
3. Illustration of typical restraint fixings
4. Illustration of typical face and soffit fixings
5. Details of typical loadbearing fixings
6. Details of typical restraint fixings
7. Details of typical soffit fixings
8. Block liners
9. Effective penetration of a typical expanding bolt
10. Typical details of fixing pins for granite-faced
     concrete units
List of references

Gives recommendations for the design, installation and maintenance of mechanically fixed facing units of natural stone as a cladding and lining. Coverage includes: definitions, sealants, staining, choice of stone, frost action, atmospheric pollution, mortices, marking, and production and storage. Also gives detailed tables and diagrams.

This British Standard gives recommendations for the design, installation and maintenance of mechanically fixed facing units of natural stone as a cladding and lining: held to a structural background by metal fixings; to precast concrete units (i.e. stone faced concrete cladding units). Loadbearing cladding or cladding held only by adhesion is not included, nor is any type of cladding supported or held in position around the perimeter of stones or series of stones by metal framing. Recommendations concerning traditional stone masonry including ashlar are given in BS5390. Movement of the structure may occur due to one or more reasons and recommendations are included to accommodate such dimensional changes (see 3.13). As it is virtually impossible to provide for this movement if the attachment of the stone cladding to the structure is too rigid, the use of stone cladding as permanent formwork to in situ concrete is not included (but see 3.8.5). This code does not include the testing of materials and components except in cases where there is a relevant British Standard. NOTE Unless the requirements differ, the term cladding refers to both cladding and lining. The general principles for cladding also apply to soffits and sloping surfaces (see 3.10.6).