Standard
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AS/NZS 4357.0:2022
[Current]Structural laminated veneer lumber, Part 0: Specifications
Specifies requirements for the manufacture, structural characterization, and structural verification of laminated veneer lumber intended for structural applications, and sets out dimensional tolerances, moisture content, veneer and bond quality, and structural properties to be determined for structural LVL. Also specifies requirements for formaldehyde emission.
Published: 12/08/2022
Pages: 19
Table of contents
Cited references
Content history
Table of contents
Header
About this publication
Preface
Introduction
1 Scope and general
1.1 Scope
1.2 Normative references
1.3 Terms and definitions
1.4 Dimensions and shape
1.4.1 Dimensions
1.4.2 Straightness
1.4.3 Twist
1.4.4 Squareness of section
1.4.5 Cupping
1.5 Moisture content
1.6 Preservative and chemical treatments
1.6.1 Preservative treatment of lyctid-susceptible sapwood
1.7 Publication of characteristic properties or data
1.8 Branding
2 Manufacture
2.1 General
2.2 Manufacturing specification
2.3 Veneer
2.3.1 General
2.3.2 Veneer quality
2.3.3 Veneer thickness
2.3.4 Veneer length
2.4 Assembly
2.4.1 General
2.4.2 Construction
2.4.3 Veneer joints
2.5 Bonding between veneers
2.6 Manufacturing process
2.7 Formaldehyde
2.7.1 Test method
2.7.2 Formaldehyde emission classes
2.8 Storage and handling
3 Structural properties
3.1 General
3.2 Properties required to be determined
3.2.1 General
3.2.2 Characteristic values for shear
3.3 Methods for determination of structural properties
3.3.1 Strength and stiffness
3.3.2 Joint strength
3.4 Adoption of F-grade
3.5 Adoption of joint group for nails, screws and bolts
3.6 Adoption of characteristic density for use with the European Yield Model
3.7 Structural design
3.7.1 General
3.7.2 Section properties
3.7.2.1 Non-cross-banded LVL
3.7.2.2 Cross-banded LVL
3.7.3 Longitudinal sawing or machining to reduce thickness
3.7.4 Taper or curve cut LVL
4 Structural verification
4.1 General
4.2 Continuous validation of structural properties
4.3 Re-evaluation of structural properties
Appendix A
Appendix B
B.1 Scope and general
B.1.1 General
B.1.2 Symbols
B.2 Sample selection
B.2.1 Frequency
B.2.2 Specimen size
B.3 Sample testing
B.3.1 General
B.4 End product properties verification
B.4.1 General
B.4.2 Determination of Ek,mean
B.4.3 Determination of Rk
B.5 Acceptance criteria
B.5.1 General
B.5.2 Ek,mean
B.5.3 Rk
B.6 Corrective action procedures
B.6.1 General
B.6.2 Individual MoE result lower than 0.85 of the published value of bending stiffness
B.6.3 Individual MoR result lower than the published characteristic value for bending strength
B.6.4 Ek,mean or Rk falls below target characteristic values
Bibliography
Cited references in this standard
[Current]
Timber structures - Dowel-type fasteners - Part 2: Determination of embedding strength
[Pending Revision]
Timber — Methods of test for mechanical fasteners and connectors — Basic working loads and characteristic strengths
[Current]
Methods of test for veneer and plywood, Method 1: Moisture content of veneer and plywood
[Current]
Methods of test for veneer and plywood, Method 2: Bond quality of plywood (chisel test)
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