AS 2858-2008

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About this publication

Preface

1 Scope and general

1.1 Scope

1.2 Application

1.3 Normative references

1.4 Definitions

1.5 Timber species and stress grades

1.6 Grades

1.6.1 Structural grades of softwood (excluding cypress and hoop)

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 Characteristics occurring entirely within the prescribed limits for 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 Grading check

1.10.6 Moisture content of preservative-treated timber

1.10.7 Docking of multiple lengths

1.11 Preservative treatment

1.12 Identification of grade

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 Heart-in stud grade (seasoned pinus species only)

2.6.1 General

2.6.2 Permissible characteristics

2.7 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

A1 Properties of structural timbers

Appendix B

Appendix C

C1 Knots, knot holes, cone holes, holes other than those caused by insects and occluded branch stubs (other than for heart-in stud grade)

C2 Heart-In Stud Grade

C3 Borer holes

C4 Slope of grain

C5 Growth rings and pith

C6 Resin pockets, bark pockets, overgrowths of injury

C7 Checks

C8 Wane and want

C9 Bow and spring

C10 Twist

C11 Cup

Appendix D

Appendix E

Appendix F

Bibliography

AS 2858:2023

AS 2858-2004

DR 08002