Standard

UPDATE AVAILABLE

AS 2858-2008

[Superseded]

Timber — Softwood — Visually stress-graded for structural purposes

This Standard specifies requirements for visual stress grading of sawn softwood intended for structural purposes at the time of grading.

Published: 30/06/2008

Pages: 66

Table of contents

Cited references

Content history

Table of contents

Header

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

Cited references in this standard

AS/NZS 4491:1997

[Current]

Timber — Glossary of terms in timber-related Standards

AS/NZS 4063:1992

[Superseded]

Timber — Stress-graded — In-grade strength and stiffness evaluation

AS/NZS 2878:2000

[Current]

Timber — Classification into strength groups

AS/NZS 1148:2001

[Current]

Timber — Nomenclature — Australian, New Zealand and imported species

AS/NZS 1080.2:2006

[Current]

Timber — Methods of test, Method 2: Slope of grain

Content history

AS 2858:2023

[Current]

AS 2858-2004

[Superseded]

DR 08002

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