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AS 2858:2023
[Current]Timber — Softwood — Visually stress-graded for structural purposes
AS 2858:2023 specifies requirements for visual stress grading of sawn softwood that is intended for structural purposes at the time of grading.
Published: 29/09/2023
Pages: 60
Table of contents
Cited references
Content history
Table of contents
Header
About this publication
Preface
1 Scope and general
1.1 Scope
1.2 Normative references
1.3 Terms and definitions
1.4 Initial evaluation of structural properties
1.5 Timber species and stress grades
1.6 Grades
1.6.1 Structural grades of softwood
1.6.2 Grades of structural cypress
1.6.3 Grades of structural hoop
1.7 Sizes and tolerances
1.7.1 Dimensions
1.7.2 Squareness
1.8 Moisture content
1.8.1 Testing
1.8.2 Seasoned timber
1.9 Characteristics
1.9.1 Measurement of characteristics
1.9.2 Combination of characteristics
1.9.3 Want and wane
1.9.4 Mechanical damage
1.10 Grade limitation and grading
1.10.1 Basis
1.10.2 Limitations
1.10.3 Variations in assessment
1.10.4 Resawing
1.10.5 Moisture content of preservative-treated timber
1.10.6 Docking of multiple lengths
1.11 Preservative treatment
1.12 Identification of grade
1.13 Check on accuracy of the grading method
1.13.1 General
1.13.2 Sampling
1.13.3 Testing
1.13.4 Evaluation
1.13.4.1 Modulus of elasticity (MOE)
1.13.4.2 Stength property
1.13.5 Results
2 Grade descriptions
2.1 Structural grade no. 1
2.1.1 General
2.1.2 Permissible characteristics
2.2 Structural grade no. 2
2.2.1 General
2.2.2 Permissible characteristics
2.3 Structural grade no. 3
2.3.1 General
2.3.2 Permissible characteristics
2.4 Structural grade no. 4
2.4.1 General
2.4.2 Permissible characteristics
2.5 Structural grade no. 5
2.5.1 General
2.5.2 Permissible characteristics
2.6 Structural appearance grades
3 Grade descriptions for cypress
3.1 General
3.2 Stress grade F7
3.2.1 General
3.2.2 Permissible characteristics
3.3 Stress grade F5
3.3.1 General
3.3.2 Permissible characteristics
3.4 Stress grade F4
3.4.1 General
3.4.2 Permissible characteristics
3.5 Structural appearance grades
4 Grade descriptions for hoop
4.1 General
4.2 Stress grade F8
4.2.1 General
4.2.2 Permissible characteristics
4.3 Stress grade F7
4.3.1 General
4.3.2 Permissible characteristics
4.4 Stress grade F5
4.4.1 General
4.4.2 Permissible characteristics
4.5 Structural appearance grades
Appendix A
A.1 Properties of structural timbers
Appendix B
B.1 Knots, knot holes, cone holes, and holes other than those caused by insects and occluded branch stubs
B.2 Borer holes
B.3 Slope of grain
B.4 Growth rings and pith
B.5 Resin pockets, bark pockets, overgrowths of injury
B.6 Checks
B.7 Wane and want
B.8 Bow and spring
B.9 Twist
B.10 Cup
Appendix C
Appendix D
Appendix E
Bibliography
Cited references in this standard
AS ISO 17025
General requirements for competence of testing and calibration laboratories
AS/NZS 4063 (all parts)
Characterization of structural timber
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