BS 4978:1996
Superseded
A superseded Standard is one, which is fully replaced by another Standard, which is a new edition of the same Standard.
View Superseded by
Specification for visual strength grading of softwood
Hardcopy , PDF
31-05-2007
English
15-08-1996
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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Superseded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 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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