ISO 22390:2010
(Main)Timber structures — Laminated veneer lumber — Structural properties
Timber structures — Laminated veneer lumber — Structural properties
ISO 22390:2010 specifies requirements for establishing the characteristic properties of structural laminated veneer lumber (LVL), including 5th percentile strength values, stiffness characteristics and other performance characteristics, related to its end use as a structural product for dry use (bonding class 1). It is applicable to members used in flatwise or edgewise bending orientations.
Structures en bois — Lamibois — Propriétés structurelles
General Information
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Standards Content (Sample)
INTERNATIONAL ISO
STANDARD 22390
First edition
2010-08-01
Timber structures — Laminated veneer
lumber — Structural properties
Structures en bois — Lamibois — Propriétés structurelles
Reference number
ISO 22390:2010(E)
©
ISO 2010
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ISO 22390:2010(E)
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ii © ISO 2010 – All rights reserved
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ISO 22390:2010(E)
Contents Page
Foreword .iv
Introduction.v
1 Scope.1
2 Normative references.1
3 Terms and definitions .2
4 Requirements.3
4.1 Veneers.3
4.2 Bonding quality .3
4.3 Dimensions and tolerances.3
5 Test methods .4
5.1 General.4
5.2 Edgewise bending strength .4
5.3 Flatwise bending strength.4
5.4 Tension strength parallel to the grain .5
5.5 Compression strength parallel to the grain.5
5.6 Shear strength (edge) related to edgewise bending.6
5.7 Shear strength (flat) related to flatwise bending.6
5.8 Compression strength perpendicular to the grain .6
6 Stiffness.6
6.1 General.6
6.2 Modulus of elasticity in edgewise bending .6
6.3 Modulus of elasticity in flatwise bending .7
6.4 Modulus of elasticity in tension parallel to the grain .7
6.5 Modulus of elasticity in compression parallel to the grain.7
7 Other physical characteristics .7
7.1 Density.7
7.2 Moisture content.7
7.3 Species equivalency for connection properties .8
7.4 Creep and duration of load effects .8
Bibliography.9
© ISO 2010 – All rights reserved iii
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ISO 22390:2010(E)
Foreword
ISO (the International Organization for Standardization) is a worldwide federation of national standards bodies
(ISO member bodies). The work of preparing International Standards is normally carried out through ISO
technical committees. Each member body interested in a subject for which a technical committee has been
established has the right to be represented on that committee. International organizations, governmental and
non-governmental, in liaison with ISO, also take part in the work. ISO collaborates closely with the
International Electrotechnical Commission (IEC) on all matters of electrotechnical standardization.
International Standards are drafted in accordance with the rules given in the ISO/IEC Directives, Part 2.
The main task of technical committees is to prepare International Standards. Draft International Standards
adopted by the technical committees are circulated to the member bodies for voting. Publication as an
International Standard requires approval by at least 75 % of the member bodies casting a vote.
Attention is drawn to the possibility that some of the elements of this document may be the subject of patent
rights. ISO shall not be held responsible for identifying any or all such patent rights.
ISO 22390 was prepared by Technical Committee ISO/TC 165, Timber structures.
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ISO 22390:2010(E)
Introduction
Laminated veneer lumber (LVL) is being produced in many countries under different national standards and
these products are being exported from one country to another. While the national standards have many
similarities, there are also many areas of dissimilarity. Thus, there is a need for the development of this
International Standard to establish consistency between these standards in order to ensure the suitability of
LVL for structural end-use applications, regardless of country of manufacture or country of end use. It is
intended for this to have value to industry, consumers, governments and distributors.
© ISO 2010 – All rights reserved v
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INTERNATIONAL STANDARD ISO 22390:2010(E)
Timber structures — Laminated veneer lumber — Structural
properties
1 Scope
This International Standard specifies requirements for establishing the characteristic properties of structural
laminated veneer lumber (LVL), including 5th percentile strength values, stiffness characteristics and other
performance characteristics, related to its end use as a structural product for dry use (bonding class 1). It is
applicable to members used in flatwise or edgewise bending orientations.
It does not cover the assessment of formaldehyde requirements, biological durability, fire performance or
manufacturing, such as quality control and marking.
2 Normative references
The following referenced documents are indispensable for the application of this document. For dated
references, only the edition cited applies. For undated references, the latest edition of the referenced
document (including any amendments) applies.
ISO 10033-1, Laminated veneer lumber — Bonding quality — Part 1: Test methods
ISO 10033-2, Laminated veneer lumber — Bonding quality — Part 2: Requirements
ISO 13910, Structural timber — Characteristic values of strength-graded timber — Sampling, full-size testing
and evaluation
ISO 16572, Timber structures — Wood-based panels — Test methods for structural properties
ISO 16979, Wood-based panels — Determination of moisture content
EN 408-03, Timber structures — Structural timber and glued laminated timber — Determination of some
physical and mechanical properties
ASTM D143-09, Standard Test Methods for Small Clear Specimens of Timber
ASTM D198-09, Standard Test Methods of Static Tests of Lumber in Structural Sizes
ASTM D4761-05, Standard Test Methods for Mechanical Properties of Lumber and Wood-Base Structural
Material
ASTM D5456-06, Standard Specification for Evaluation of Structural Composite Lumber Products
ASTM D6815-09, Standard Specification for Evaluation of Duration of Load and Creep Effects of Wood and
Wood-Based Products
MAFF Notification No. 701, Japanese Agricultural Standard for Laminated Veneer Lumber
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ISO 22390:2010(E)
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
3.1
laminated veneer lumber
LVL
composite of wood veneer sheet elements manufactured from one or more species, either separately or
mixed, with wood fibres primarily oriented along the length of the member
NOTE This does not exclude laminated veneer lumber with cross-laminated veneers.
3.2
characteristic value for strength
estimate of the 5th percentile values based on a statistical distribution obtained from results of tests on the
defined properties in accordance with Clauses 5 and 6 with the test duration between 60 s and 300 s
3.3
characteristic value for stiffness
estimate of the mean property from results of tests on the defined properties in accordance with Clauses 5
and 6 with the test duration between 60 s and 300 s
NOTE The characteristic values used for 3.2 and 3.3 are either an estimate of the 5th percentile value or an estimate
of the mean value of the sample as determined from ISO/TC 165 draft document on the evaluation of characteristic values
for structural timber products.
3.4
population
assembly of samples that are clearly defined since the characteristic properties apply only to that population
NOTE The sample size is chosen to be representative of the reference population, taking into consideration the
occurrence of strength-reducing characteristics which affect the structural property being evaluated.
3.5
test specimen
specimen cut from random locations within the pieces of the LVL samples
3.6
thickness
d
least dimension of a cross-section, which is perpendicular to the plane of the veneers
See Figure 1.
3.7
width
b
largest dimension of a cross-section, which is perpendicular to the thickness (or parallel to the plane of the
veneers)
See Figure 1.
3.8
depth
dimension of the specimen related to the direction of the applied load, b for edgewise (joist) and d for flatwise
(plank)
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ISO 22390:2010(E)
a) Cross-section related to edgewise bending b) Cross-section related to flatwise bending
Figure 1 — Thickness, d, and width, b, of cross-section of laminated veneer lumber
4 Requirements
4.1 Veneers
The minimum number of veneers in the cross-section shall be five. The maximum thickness of each veneer
shall be 6 mm.
4.2 Bonding quality
The LVL shall utilize a structural adhesive suitable for dry service (bonding class 1) and the bonding quality
and adhesive qualification shall be determined in accordance with ISO 10033-1 and ISO 10033-2.
NOTE 1 Attention is drawn to national standards which can be applicable.
NOTE 2 Examples of applicable national standards include EN 314-1, ASTM D5456 and JAS Notification No. 701.
NOTE 3 Additional testing to cover more severe bonding service conditions (bonding classes 2 and 3) can be
considered as a manufacturer's option and can be required by some national standards.
4.3 Dimensions and tolerances
The dimensions of the test specimens shall be measured to the following accuracy:
a) for dimensions u 150 mm: ± 0,1 mm;
b) for dimensions > 150 mm and u 400 mm: ± 0,5 mm;
c) for dimensions > 400 mm: ± 1 mm.
All measurements shall be made after the test pieces have been conditioned in accordance with Clause 5.
Width and thickness measurements (see Figure 1) shall be the average of three measurements taken at three
different positions within the middle third of the specimen. Where possible, the measurements should not be
taken within 150 mm of the ends of the
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