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BS 4978:1996

Superseded
Superseded

A superseded Standard is one, which is fully replaced by another Standard, which is a new edition of the same Standard.

View Superseded by
superseded

A superseded Standard is one, which is fully replaced by another Standard, which is a new edition of the same Standard.

Specification for visual strength grading of softwood
Available format(s)

Hardcopy , PDF

Superseded date

31-05-2007

Language(s)

English

Published date

15-08-1996

Publisher

British Standards Institution

Foreword
Specification
1 Scope
2 References
3 Definitions
4 Strength graded timber
5 Measurement of characteristics
6 Grade requirements
7 Marking
Annexes
A (normative) Determination of the knot area ratio in
    cases of dispute
B (normative) The control and supervision of strength
    grading operations
C (normative) Determination of slope of grain
D (informative) Species marking
Table
1 Permissible limits for the GS and SS visual strength
    grades
Figures
1 Edge, face and margin areas
2 Knot projection
3 Typical knot area rations and the resulting grades
4 Measurement of rate of growth
5 Amounts of wane
6 Measurement of bow, spring and twist
7 Example of a mark on visually strength graded softwood
C.1 Swivel handled scribe for determination of slope of
    grain
C.2 Use of scribe
C.3 Measurement of slope of grain

Specifies two grades for structural use. Covers softwoods graded in the UK and abroad under the supervision of a certification body approved by the UK Timber Grading Committee.

Committee
B/518
DevelopmentNote
Supersedes BS 4978(1988) & 95/102069 DC. (07/2005)
DocumentType
Standard
Pages
18
PublisherName
British Standards Institution
Status
Superseded
SupersededBy
Supersedes

BS 1722-7(2006) : 2006 FENCES - PART 7: SPECIFICATION FOR WOODEN POST AND RAIL FENCES
BS 5268-3:2006 STRUCTURAL USE OF TIMBER - PART 3: CODE OF PRACTICE FOR TRUSSED RAFTER ROOFS
ISO 9709:2005 Structural timber Visual strength grading Basic principles
BS 5975(2008) : 2008 CODE OF PRACTICE FOR TEMPORARY WORKS PROCEDURES AND THE PERMISSIBLE STRESS DESIGN OF FALSEWORK
BS 5534(2003) : 2003 CODE OF PRACTICE FOR SLATING AND TILING (INCLUDING SHINGLES)
BS EN 518:1995 Structural timber. Grading. Requirements for visual strength grading standards
BS 1186-3:1990 Timber for and workmanship in joinery Specification for wood trim and its fixing
BS 5268-3:1998 Structural use of timber Code of practice for trussed rafter roofs
BS 5268-2:1996 Structural use of timber Code of practice for permissible stress design, materials and workmanship
BS 4485-4:1996 Water cooling towers Code of practice for structural design and construction
BS 5268-7.4:1989 STRUCTURAL USE OF TIMBER - PART 7: RECOMMENDATIONS FOR THE CALCULATION BASIS FOR SPAN TABLES - SECTION 7.4: CEILING BINDERS
BS 5268-7.3:1989 STRUCTURAL USE OF TIMBER - PART 7: RECOMMENDATIONS FOR THE CALCULATION BASIS FOR SPAN TABLES - SECTION 7.3: CEILING JOISTS
BS 5268-7.5:1990 STRUCTURAL USE OF TIMBER - PART 7: RECOMMENDATIONS FOR THE CALCULATION BASIS FOR SPAN TABLES - SECTION 7.5: DOMESTIC RAFTERS

BS EN 519:1995 Structural timber. Grading. Requirements for machine strength graded timber and grading machines
BS EN 386:2001 Glued laminated timber. Performance requirements and minimum production requirements
BS EN 518:1995 Structural timber. Grading. Requirements for visual strength grading standards
BS 7359:1991 Nomenclature of commercial timbers including sources of supply

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PDF - English
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