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AS/NZS 4063.2:2025
[Current]Characterization of structural timber and engineered wood products, Part 2: Determination of characteristic values
AS/NZS 4063.2:2025 specifies requirements for sampling, statistical evaluation of test data and determination of characteristic values for structural timber products for structural design.
Published: 28/11/2025
Pages: 56
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 Terms and definitions
1.5 Symbols and abbreviated terms
1.5.1 General
1.5.2 Subscripts
2 Reference population, sampling and selection of test pieces
2.1 General
2.2 Reference population
2.2.1 Solid sawn timber
2.2.2 Engineered wood products
2.3 Sampling
2.3.1 Sampling method
2.3.2 Sample size
2.3.3 Sample conditioning
2.4 Selection of test pieces
3 Evaluation of characteristic values from sample test data
3.1 General
3.2 Characteristic values
3.3 Statistical evaluation methods
3.3.1 Evaluation of characteristic values
3.3.2 Calculation of coefficient of variation
3.3.3 Evaluation based on combined or pooled data
3.4 Non-standard test conditions and configurations
4 Determination of design characteristic values or assignment of stress grades
5 Report
Appendix A
A.1 General
A.2 Characteristic strength values
A.2.1 General
A.2.2 Statistical evaluation, method 1 — parametric (reference method)
A.2.2.1 General
A.2.2.2 Test data
A.2.2.3 Characteristic value of a strength property
A.2.2.4 Sampling factor (ks) and 5th percentile strength (f05)
A.2.2.5 Use on truncated datasets
A.2.3 Statistical evaluation, method 2 — non-parametric (alternative method)
A.2.3.1 General
A.2.3.2 Test data
A.2.3.3 Characteristic value of a strength property
A.2.3.4 Sampling factor (ks) and 5th percentile strength (f05)
A.2.4 Statistical evaluation, method 3 — Non-parametric (alternative method)
A.2.4.1 General
A.2.4.2 Characteristic value of a strength property
A.3 Characteristic stiffness values
A.3.1 General
A.3.2 Test data
A.3.3 Characteristic values
A.3.4 Sampling factor (ks), mean modulus of elasticity E¯ and 5th percentile modulus of elasticity (E05)
A.4 Characteristic rigidity values
A.4.1 General
A.4.2 Test data
A.4.3 Characteristic value
A.4.4 Sampling factor ks, mean modulus of rigidity (G¯)
A.5 Characteristic compression stiffness value perpendicular to grain
A.6 Characteristic density
A.6.1 General
A.6.2 Test data
A.6.3 Characteristic value
A.6.3.1 Sampling factor (ks) and 5th percentile strength (ρ05)
A.7 Design density (characteristic mean density)
A.7.1 General
A.7.2 Test data
A.7.3 Characteristic value
A.7.4 Sampling factor (ks) and density ρ¯
A.8 Pooling size-dependent strength test data
A.8.1 General
A.8.2 Requirements for pooling of test data
A.8.3 Selection of reference size
A.8.4 Normalization factors
A.8.5 Normalizing test data
A.8.6 Characteristic value of pooled dataset
A.8.7 Characteristic value of each product size
Appendix B
B.1 General
B.2 Modification factor for variability
Appendix C
C.1 Commentary on scope and general
C.1.1 Commentary on scope
C.1.2 Commentary on application
C.1.3 Commentary on normative references
C.1.4 Commentary on terms and definitions
C.1.5 Commentary on symbols and abbreviated terms
C.2 Commentary on reference population, sampling and selection of test pieces
C.2.1 Commentary on general
C.2.2 Commentary on reference population
C.2.3 Commentary on sampling
C.2.3.1 Commentary on sampling method
C.2.3.2 Commentary on sample size
C.2.3.3 Commentary on sample conditioning
C.2.3.3.1 General
C.2.3.3.2 Moisture content
C.2.3.3.3 Product temperatures
C.2.4 Commentary on selection of test pieces
C.3 Commentary on evaluation of characteristic values from sample test data
C.3.1 Commentary on general
C.3.2 Commentary on characteristic values
C.3.3 Commentary on characteristic value based on the mean
C.3.4 Commentary on characteristic value based on the 5th percentile
C.4 Commentary on determination of design characteristic values or assignment of stress grades
C.5 Commentary on report
C.5.1 General
C.5.2 Commentary on reference population
C.5.3 Commentary on sampling
C.5.4 Commentary on test methods
C.5.5 Commentary on analysis methods
C.5.6 Commentary on characteristic values
C.6 Commentary on combining or pooling of data
Appendix D
D.1 General
D.2 Characteristic value for strength
D.2.1 General
D.2.2 Typical strength test data
D.2.3 Example 1 — Statistical evaluation method 1 (reference method), Clause A.2.2
D.2.3.1 Data and parameters
D.2.3.2 Procedure
D.2.3.3 Example 2 — Procedure for use on a truncated dataset from Clause A.2.2.5
D.2.4 Example 3 — Statistical evaluation method 2, Clause A.2.3
D.2.4.1 Non-parametric point estimate of 5th percentile
D.2.4.2 Sampling factor (ks)
D.2.4.3 Procedure
D.2.4.4 Characteristic value for strength
D.2.5 Example 4 — Statistical evaluation method 3, Appendix A
D.3 Characteristic value of modulus of elasticity
D.3.1 Data and parameters
D.3.2 Procedure
D.4 Data pooling example
Bibliography
Cited references in this standard
[Current]
Timber structures — Determination of characteristic values — Part 1: Basic requirements
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