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BS 5268-2:1996

Superseded
Superseded

A superseded Standard is one, which is fully replaced by another Standard, which is a new edition of the same Standard.

Structural use of timber Code of practice for permissible stress design, materials and workmanship
Available format(s)

Hardcopy , PDF

Superseded date

14-03-2002

Language(s)

English

Published date

15-08-1996

Committees responsible
Foreword
Code of practice
Section 1. General
1.1 Scope
1.2 References
1.3 Definitions
1.4 Symbols
1.5 Materials
1.6 Design considerations
Section 2 Timber
Section 3 Glued laminated timber
Section 4 Plywood
Section 5 Tempered hardboard
Section 6 Joints
Section 7 Workmanship, inspection and maintenance
Section 8 Testing
Section 9 Wood particleboard
Annexes
A (normative) Structural timbers
B (normative) Modification factor for compression
     members
C (normative) Efficiency ratings of glued end joints in
     softwoods
D (informative) Species of timber used in the manu-
     facture of plywood
E (informative) Grade marks for plywood
F (informative) Modulus of elasticity and shear modulus
     for tempered steel
G (informative) Derivation of the basic lateral load-
     carrying capacities referred to in section 6
H (normative) Moisture content determination by oven
     dry method
J (informative) Modulus of elasticity and shear modulus
     for particleboard
Tables
1 Moisture content of timber related to service class
2 Softwood combinations of species and visual grade
     which satisfy requirements for various strength
     classes.
3 North American softwood species/grade combinations
     which satisfy the requirements for various strength
     classes.NLGA and NGRDL Joist and plank rules
4 North American softwood species/grade combinations
     which satisfy the requirements for various strength
     classes (NLGA and NGRDL Structural Light Framing and
     Stud rules)
5 North American softwood species/grade combinations
     which satisfy requirements for strength classes
     in accordance with machine stress-related rules
6 Tropical hardwoods which satisfy the requirements
     for strength classes given in BS EN 338 when graded
     to HS grade in accordance with BS 5756
7 Grade stresses and moduli of elasticity for various
     strength classes: for service classes 1 and 2
8 Grade stresses for softwoods graded in accordance
     with BS 4978: for service classes 1 and 2
9 Grade stresses for Canadian softwoods graded in
     accordance with NLGA rules: for services 1 and 2
10 Grade stresses for USA softwoods graded in accordance
     with NHRDL rules: for service classes 1 and 2
11 Grade stresses for North American softwoods graded in
     accordance with N. American MSR rules:classes 1 and 2
12 Grade stresses for tropical hardwoods graded in
     accordance with BS 5756 rules: services classes 1,2
13 Modification factor K2 by which stresses and moduli
     for service classes 1 and 2 should be multiplied
     to obtain stresses and moduli applicable to service
     class 3
14 Modification factor K3 for duration of loading
15 Modification factor K4 for bearing stress
16 Maximum depth to breadth ratios (solid and laminated
     members)
17 Modification factor K9 used to modify the minimum
     modulus of elasticity for trimmer joists and lintels
18 Effective length of compression members
19 Modification factor K12 for compression members
20 Modification factor K13 for the effective length of
     spaced columns
21 Modification factors K15 - K20 for single grade glued
     laminated members and horizontally glued laminated
     beams
22 Modification factors K27-K29 for vertically glued
     laminated members
23 Modification factors K30 - K32 for individually
     designed glued end joints in horizontally glued
     laminated members
24 Values of constants for determining radial stresses
     in pitched cambered softwood beams
25 Section properties of American construction and
     industrial plywood: unsanded and touch sanded
26 Section properties of American construction and
     industrial plywood: sanded
27 Section properties of Canadian Douglas fir and soft-
     wood plywood: unsanded
28 Section properties of Finnish birch plywood: sanded
29 Section properties of Finnish birch-faced plywood:
     sanded
30 Section properties of Finnish conifer plywood: sanded
31 Section properties of Swedish softwood plywood:
     unsanded
32 Section properties of Swedish softwood plywood:
     sanded
33 Modification factor K36 by which the grade stresses
     and moduli for long-term duration and service classes
     1 and 2 for plywood should be multiplied to obtain
     values for other durations and/or service class 3
34 Grade stresses and moduli for service classes 1 and 2
     for American plywood: C-D grade Exposure 1. Unsanded
35 Grade stresses and moduli for service classes 1 and 2
     for American plywood: C-C. Exterior Group 1. Unsanded
Tables 36 - 105
A.1 Names and densities of some structural softwoods
A.2 Names and densities of some structural hardwoods
C.1 Efficiency ratings of some finger profiles
D.1 Species used in American C-D and C-C plywood
D.2 Species used in Canadian plywood
D.3 Species used in Finnish plywood
G.1 Characteristic density of timber at 12% moisture
     content
G.2 Characteristic density of plywood at 12% moisture
     content
Figures
1 Position of end bearing
2 Notched beams
3 Axes in spaced columns
4 Curved glued laminated beam
5 Pitched cambered beam
6 Shear stress in the jointed timber
7 Connector end and edge distances
8 Dimensions of circular recesses for shear-plate
     connector units conforming to BS 1579
E.1 American construction and industrial plywoods
E.2 Canadian Douglas fir and softwood plywoods
E.3 Finnish birch, birch-faced and conifer plywoods
E.4 Swedish softwood plywood
G.1 Diagram indicating the dimensions t1 and t2 of
     nailed/screwed joints
G.2 Bolted/dowelled joints
List of references



Provides guidance on the structural use of timber, glued laminated timber and wood based panels. Includes quality grade stresses, modification factors, joint design, testing procedures, workmanship, inspection and maintenance.

Committee
B/525/5
DevelopmentNote
DRAFT FOR COMMENT 95/101592 DC
DocumentType
Standard
Pages
186
PublisherName
British Standards Institution
Status
Superseded

BS EN 322:1993 Wood-based panels. Determination of moisture content
BS EN 519:1995 Structural timber. Grading. Requirements for machine strength graded timber and grading machines
BS EN 314-2:1993 Plywood. Bonding quality Requirements
BS EN 323:1993 Wood-based panels. Determination of density
BS EN 386:2001 Glued laminated timber. Performance requirements and minimum production requirements
BS 1210:1963 Specification for wood screws
BS EN 314-1:2004 Plywood. Bonding quality Test methods
BS EN 518:1995 Structural timber. Grading. Requirements for visual strength grading standards
BS 6399-2:1995 Loading for buildings Code of practice for wind loads
BS 6399-3(1988) : 1988 LOADING FOR BUILDINGS - PART 3: CODE OF PRACTICE FOR IMPOSED ROOF LOADS
BS 1202-1:1974 Specification for nails Specifications for nails. Steel nails
BS 1203:1979 Specification for synthetic resin adhesives (phenolic and aminoplastic) for plywood
BS 6150:1991 Code of practice for painting of buildings
BS 5756:1997 Specification for visual strength grading of hardwood
BS CP3:CH5-2(1972) : AMD 7908 CODE OF BASIC DATA FOR THE DESIGN OF BUILDINGS - LOADING - WIND LOADS
BS 1579:1960 Specification for connectors for timber
BS 1204:1993 Specification for type MR phenolic and aminoplastic synthetic resin adhesives for wood
BS EN 338:2016 Structural timber. Strength classes
BS EN 310:1993 Wood-based panels. Determination of modulus of elasticity in bending and of bending strength
BS EN 20898-1:1992 Mechanical properties of fasteners Bolts, screws and studs
BS 6100-4.3:1984 Glossary of building and civil engineering terms. Forest products Wood based panel products
BS 6100-4.5:1984 Glossary of building and civil engineering terms. Forest products Cork
BS 4978:1996 Specification for visual strength grading of softwood
BS 6446:1984 Specification for manufacture of glued structural components of timber and wood based panel products
BS EN 385:2001 Finger jointed structural timber. Performance requirements and minimum production requirements
BS 6399-1:1984 Loading for buildings Code of practice for dead and imposed loads
BS EN 301:2013 Adhesives, phenolic and aminoplastic, for load-bearing timber structures. Classification and performance requirements
BS 5669-2:1989 Particleboard Specification for wood chipboard
BS 1142:1989 Specification for fibre building boards
BS EN 324-2:1993 Wood-based panels. Determination of dimensions of boards Determination of squareness and edge straightness
BS EN 324-1:1993 Wood-based panels. Determination of dimensions of boards Determination of thickness, width and length
BS 4320:1968 Specification for metal washers for general engineering purposes. Metric series
BS 6100-4.2:1984 Glossary of building and civil engineering terms. Forest products Sizes and quantities of solid timber
BS EN 315:2000 Plywood. Tolerances for dimensions
BS 449-2:1969 Specification for the use of structural steel in building Metric units
BS EN 336:2013 Structural timber. Sizes, permitted deviations
BS 5669-1:1989 Particleboard Methods of sampling, conditioning and test

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