Skip to content
Please enter a keyword to search

  • BS 4978:1996

    View superseded by
    Superseded A superseded Standard is one, which is fully replaced by another Standard, which is a new edition of the same Standard.
    View superseded by

    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    Superseded date:  31-05-2007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

    Add To Cart

    Table of Contents - (Show below) - (Hide below)

    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

    Abstract - (Show below) - (Hide below)

    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.

    General Product Information - (Show below) - (Hide below)

    Committee B/518
    Development Note Supersedes BS 4978(1988) & 95/102069 DC. (07/2005)
    Document Type Standard
    Publisher British Standards Institution
    Status Superseded
    Superseded By
    Supersedes

    Standards Referenced By This Book - (Show below) - (Hide below)

    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

    Standards Referencing This Book - (Show below) - (Hide below)

    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
    View more information

    • Access your standards online with a subscription

      Features

      • Simple online access to standards, technical information and regulations
      • Critical updates of standards and customisable alerts and notifications
      • Multi - user online standards collection: secure, flexibile and cost effective