lOMoARcPSD|67691079
BRITISH STANDARD BS 5268-2:2002
Incorporating
Amendment No. 1
Structural use of
timber —
Part 2: Code of practice for permissible
stress design, materials and
workmanship
Licensed copy:PONTYPRIDD COLLEGE, 28/02/2008, Uncontrolled Copy, © BSI
ICS 91.080.20
12&23<,1*:,7+287%6,3(50,66,21(;&(37$63(50,77('%<&23<5,*+7/$:
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BS 5268-2:2002
Committees responsible for this
British Standard
The preparation of this part of BS 5268 was entrusted by Technical
Committee B/525, Building and civil engineering structures, to
Subcommittee B/525/5, Structural use of timber, upon which the following
bodies were represented:
Association of Consulting Engineers
British Cement Association
British Constructional Steelwork Association Ltd.
British Masonry Society
Building Employers’ Confederation
Department of the Environment (Building Research Establishment)
Department of the Environment (Construction Sponsorship Directorate)
Department of Transport
Federation of Civil Engineering Contractors
Institution of Civil Engineers
Licensed copy:PONTYPRIDD COLLEGE, 28/02/2008, Uncontrolled Copy, © BSI
Institution of Structural Engineers
National Council of Building Material Producers
Royal Institute of British Architects
Timber Research and Development Association
The following bodies were also represented in the drafting of the standard
through subcommittees and panels:
British Woodworking Federation
Department of the Environment (Property and Buildings Directorate)
Health and Safety Executive
National House-Building Council
Timber Trade Federation
This British Standard, having
been prepared under the
direction of the Building and
Civil Engineering Sector Policy
and Strategy Committee, was
published under the authority
of the Standards Policy and
Strategy Committee on
14 March 2002
© BSI 2007
First published August 1984
Second edition December 1988
Third edition July 1991
Amendments issued since publication
Fourth edition August 1996
Fifth edition March 2002
Amd. No. Date Comments
Amendment No. 1 31 December 2007 See foreword
The following BSI references
relate to the work on this
standard:
Committee reference B/525/5
Draft for comment 00/104922 DC
ISBN 978 0 580 60816 2
Downloaded by Travis Scott ()
, lOMoARcPSD|67691079
BS 5268-2:2002
Contents
Page
Committees responsible Inside front cover
Foreword viii
Section 1. General
1.1 Scope 1
1.2 Normative references 1
1.3 Terms and definitions 4
1.4 Symbols 6
1.5 Materials 7
1.6 Design considerations 7
Section 2. Timber
2.1 General 13
2.2 Timber specification 13
2.3 Species 13
2.4 Dimensions and geometrical properties 13
Licensed copy:PONTYPRIDD COLLEGE, 28/02/2008, Uncontrolled Copy, © BSI
2.5 Grades 14
2.6 Grade stresses for strength classes and individual species 14
2.7 Additional properties 28
2.8 Duration of loading 28
2.9 Load-sharing systems 29
2.10 Flexural members 29
ｗｗｗ．ｂｚｆｘｗ．ｃｏｍ
2.11 Compression members 34
2.12 Tension members 39
Section 3. Glued laminated timber
3.1 General 41
3.2 Grade stresses for horizontally glued laminated members 41
3.3 Grade stresses for vertically glued laminated beams 41
3.4 Glued end joints in glued laminated timber 42
3.5 Glued laminated flexural members 43
3.6 Glued laminated compression members 46
3.7 Glued laminated tension members 47
Section 4. Plywood
4.1 General 49
4.2 Durability 49
4.3 Dimensions and section properties 50
4.4 Grades 54
4.5 Grade stresses and moduli 55
4.6 Design data derived from characteristic values 55
4.7 Flexural members 56
4.8 Plywoods for roof and floor decking 57
Section 5. Panel products other than plywood
5.1 General 77
5.2 Section properties 77
5.3 Strength and elastic moduli 77
5.4 Panel products for roof and floor decking 79
© BSI 2007 i
Downloaded by Travis Scott ()
, lOMoARcPSD|67691079
BS 5268-2:2002
Page
Section 6. Joints
6.1 General 81
6.2 Joint slip 82
6.3 Anti-corrosion treatment 82
6.4 Nailed joints 82
6.5 Screwed joints 90
6.6 Bolted and dowelled joints 97
6.7 Toothed-plate connector joints 112
6.8 Split-ring connector joints 126
6.9 Shear-plate connector joints 134
6.10 Glued joints 139
Section 7. Workmanship, inspection and maintenance
7.1 General 143
7.2 Moisture content 143
7.3 Machining and preparation 143
7.4 Joints 144
7.5 Transportation, storage and handling 144
Licensed copy:PONTYPRIDD COLLEGE, 28/02/2008, Uncontrolled Copy, © BSI
7.6 Assembly and erection 145
7.7 Treatments 145
7.8 Inspection 145
7.9 Maintenance 145
Section 8. Testing
8.1 General 147
8.2 Testing authority
8.3 Information required
ｗｗｗ．ｂｚｆｘｗ．ｃｏｍ
8.4 Quality and manufacture of test structure
8.5 Method of testing
147
147
147
147
8.6 Acceptance 149
8.7 Test report 150
8.8 Use of tested structures 150
8.9 Testing of roof and floor decking assemblies 150
Annex A Text deleted 151
Annex B (normative) Modification factor for compression members 151
Annex C (normative) Efficiency ratings of glued end joints in softwoods 152
Annex D (informative) Species of timber used in the
manufacture of plywood 152
Annex E (informative) Grade marks for plywood 155
Annex F Text deleted 158
Annex G (informative) Derivation of the basic lateral
load-carrying capacities referred to in section 6 158
Annex H (normative) Moisture content determination by
oven dry method 163
Annex J Text deleted 163
Annex K Text deleted 163
Annex L (informative) K factors 164
Annex M (normative) Supplementary accidental damage provisions 167
Bibliography 170
ii © BSI 2007
Downloaded by Travis Scott ()
BRITISH STANDARD BS 5268-2:2002
Incorporating
Amendment No. 1
Structural use of
timber —
Part 2: Code of practice for permissible
stress design, materials and
workmanship
Licensed copy:PONTYPRIDD COLLEGE, 28/02/2008, Uncontrolled Copy, © BSI
ICS 91.080.20
12&23<,1*:,7+287%6,3(50,66,21(;&(37$63(50,77('%<&23<5,*+7/$:
Downloaded by Travis Scott ()
, lOMoARcPSD|67691079
BS 5268-2:2002
Committees responsible for this
British Standard
The preparation of this part of BS 5268 was entrusted by Technical
Committee B/525, Building and civil engineering structures, to
Subcommittee B/525/5, Structural use of timber, upon which the following
bodies were represented:
Association of Consulting Engineers
British Cement Association
British Constructional Steelwork Association Ltd.
British Masonry Society
Building Employers’ Confederation
Department of the Environment (Building Research Establishment)
Department of the Environment (Construction Sponsorship Directorate)
Department of Transport
Federation of Civil Engineering Contractors
Institution of Civil Engineers
Licensed copy:PONTYPRIDD COLLEGE, 28/02/2008, Uncontrolled Copy, © BSI
Institution of Structural Engineers
National Council of Building Material Producers
Royal Institute of British Architects
Timber Research and Development Association
The following bodies were also represented in the drafting of the standard
through subcommittees and panels:
British Woodworking Federation
Department of the Environment (Property and Buildings Directorate)
Health and Safety Executive
National House-Building Council
Timber Trade Federation
This British Standard, having
been prepared under the
direction of the Building and
Civil Engineering Sector Policy
and Strategy Committee, was
published under the authority
of the Standards Policy and
Strategy Committee on
14 March 2002
© BSI 2007
First published August 1984
Second edition December 1988
Third edition July 1991
Amendments issued since publication
Fourth edition August 1996
Fifth edition March 2002
Amd. No. Date Comments
Amendment No. 1 31 December 2007 See foreword
The following BSI references
relate to the work on this
standard:
Committee reference B/525/5
Draft for comment 00/104922 DC
ISBN 978 0 580 60816 2
Downloaded by Travis Scott ()
, lOMoARcPSD|67691079
BS 5268-2:2002
Contents
Page
Committees responsible Inside front cover
Foreword viii
Section 1. General
1.1 Scope 1
1.2 Normative references 1
1.3 Terms and definitions 4
1.4 Symbols 6
1.5 Materials 7
1.6 Design considerations 7
Section 2. Timber
2.1 General 13
2.2 Timber specification 13
2.3 Species 13
2.4 Dimensions and geometrical properties 13
Licensed copy:PONTYPRIDD COLLEGE, 28/02/2008, Uncontrolled Copy, © BSI
2.5 Grades 14
2.6 Grade stresses for strength classes and individual species 14
2.7 Additional properties 28
2.8 Duration of loading 28
2.9 Load-sharing systems 29
2.10 Flexural members 29
ｗｗｗ．ｂｚｆｘｗ．ｃｏｍ
2.11 Compression members 34
2.12 Tension members 39
Section 3. Glued laminated timber
3.1 General 41
3.2 Grade stresses for horizontally glued laminated members 41
3.3 Grade stresses for vertically glued laminated beams 41
3.4 Glued end joints in glued laminated timber 42
3.5 Glued laminated flexural members 43
3.6 Glued laminated compression members 46
3.7 Glued laminated tension members 47
Section 4. Plywood
4.1 General 49
4.2 Durability 49
4.3 Dimensions and section properties 50
4.4 Grades 54
4.5 Grade stresses and moduli 55
4.6 Design data derived from characteristic values 55
4.7 Flexural members 56
4.8 Plywoods for roof and floor decking 57
Section 5. Panel products other than plywood
5.1 General 77
5.2 Section properties 77
5.3 Strength and elastic moduli 77
5.4 Panel products for roof and floor decking 79
© BSI 2007 i
Downloaded by Travis Scott ()
, lOMoARcPSD|67691079
BS 5268-2:2002
Page
Section 6. Joints
6.1 General 81
6.2 Joint slip 82
6.3 Anti-corrosion treatment 82
6.4 Nailed joints 82
6.5 Screwed joints 90
6.6 Bolted and dowelled joints 97
6.7 Toothed-plate connector joints 112
6.8 Split-ring connector joints 126
6.9 Shear-plate connector joints 134
6.10 Glued joints 139
Section 7. Workmanship, inspection and maintenance
7.1 General 143
7.2 Moisture content 143
7.3 Machining and preparation 143
7.4 Joints 144
7.5 Transportation, storage and handling 144
Licensed copy:PONTYPRIDD COLLEGE, 28/02/2008, Uncontrolled Copy, © BSI
7.6 Assembly and erection 145
7.7 Treatments 145
7.8 Inspection 145
7.9 Maintenance 145
Section 8. Testing
8.1 General 147
8.2 Testing authority
8.3 Information required
ｗｗｗ．ｂｚｆｘｗ．ｃｏｍ
8.4 Quality and manufacture of test structure
8.5 Method of testing
147
147
147
147
8.6 Acceptance 149
8.7 Test report 150
8.8 Use of tested structures 150
8.9 Testing of roof and floor decking assemblies 150
Annex A Text deleted 151
Annex B (normative) Modification factor for compression members 151
Annex C (normative) Efficiency ratings of glued end joints in softwoods 152
Annex D (informative) Species of timber used in the
manufacture of plywood 152
Annex E (informative) Grade marks for plywood 155
Annex F Text deleted 158
Annex G (informative) Derivation of the basic lateral
load-carrying capacities referred to in section 6 158
Annex H (normative) Moisture content determination by
oven dry method 163
Annex J Text deleted 163
Annex K Text deleted 163
Annex L (informative) K factors 164
Annex M (normative) Supplementary accidental damage provisions 167
Bibliography 170
ii © BSI 2007
Downloaded by Travis Scott ()
