AS/NZS 4357.0:2005
This Standard was prepared by the Joint Standards Australia/Standards New Zealand Committee TM-008, Plywood Timber Products, to supersede AS/NZS 4357:1995, Structural Laminated Veneer Lumber.
The objective of this Standard is to specify requirements for the manufacture, structural characterization, and structural verification of laminated veneer lumber (LVL) intended for structural applications.
The objective of this revision is to reflect the advances in the industry and developments in manufacturing and utilization technologies.
This revision includes requirements for the testing and labelling of structural LVL for formaldehyde emission. Three formaldehyde emission classes, E 0 , E 1 and E 2 have been specified.
LVL is an internationally used generic descriptor for an assembly of veneers laminated with adhesive, in which the grain direction of the outer veneers and most other veneers is in the longitudinal direction.
LVL is used for a wide variety of purposes, including structural and non-structural applications as follows:
(a) Structural applications include continuous length LVL as beams and columns for houses, wide span buildings and bridges; formwork; truss chords; I-beam flanges; short length LVL jointed together with nail plates to form beams; scaffold planks and structural decking or soffits, usually incorporating two or more cross-band veneers for stability.
(b) Non-structural applications include joinery, furniture and fitments where appearance or machining qualities, or both, are important but structural reliability and bond durability are relatively less important. LVL for these applications is sometimes curve-formed or covered with decorative overlays, or encased in other materials.
This Standard has been prepared to cover the manufacture and characterization of LVL intended for structural use only, and called structural LVL. It does not attempt to describe requirements for LVL intended for non-structural uses.
Appearance requirements for structural LVL are not specified. Only phenolic, Type A bonds are included on the basis that, currently, only that bond type has known long-term durability, suitable for structural applications.
This Standard is only concerned with the LVL component of assemblies such as trusses, nail plate jointed beams and I-beams, but not the assemblies themselves.
This Standard, written in performance terms, seeks to ensure reliability and predictability of performance in all aspects, by requiring the following:
(i) Manufacture of structural LVL to a specification that identifies and sets limits upon all controlling process variables.
(ii) Testing and evaluation of in-grade manufactured structural LVL in order to derive reliable engineering design properties.
(iii) Continuous monitoring of the mechanical properties of structural LVL as it is produced, in order to verify and validate continued use of stated design properties.
This Standard is revised to form Part 0 of the AS/NZS 4357 series, Structural laminated veneer lumber, which comprises the following parts:
AS/NZS
4357 Structural laminated veneer lumber
4357.0 Part 0: Specifications (this Standard)
4357.1 Part 1: Method of test for measurement of dimensions and shape (to supersede AS/NZS 2098.10:1995, Methods of test for veneer and plywood, Method 10: Measurement of dimensions and shape for structural Laminated Veneer Lumber)
4357.4 Part 4: Determination of formaldehyde emission
This Committee is currently developing companion Standards in relation to testing and evaluation of structural LVL, as follows:
Part 2: Determination of structural properties—Test methods
Part 3: Determination of Structural Properties—Evaluation methods
The term ‘informative’ has been used in this Standard to define the application of the appendix to which it applies. An ‘informative’ appendix is only for information and guidance.
Product Keywords:Structural Laminated Veneer Lumber (LVL),LVL Timber Beams,Laminated Veneer Lumber,Structural LVL Panels,LVL Construction Timber,Engineered LVL Beams,High-Strength LVL
Standard Keywords:AS/NZS 4357.0:2005 Compliant,AS/NZS 4357 LVL,Structural LVL Standard,Australian/New Zealand Standard LVL,AS/NZS 4357 Certified Lumber,LVL Timber to AS/NZS 4357.0,AS/NZS 4357:2005 Laminated Veneer Lumber
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