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STANDARDSIST EN 14279:2005/kprA1:2008SIST EN 14279:20051DGRPHãþD
SIST EN 14279:2005+A1:2009
EUROPEAN STANDARD NORME EUROPÉENNE EUROPÄISCHE NORM
EN 14279:2004+A1
March 2009 ICS 79.080; 79.060.20 Supersedes EN 14279:2004English Version
Laminated Veneer Lumber (LVL) - Definitions, classification and specifications
Lamibois (LVL) - Définitions, classification et spécifications Furnierschichtholz (LVL) - Definitionen, Klassifizierung und Spezifikationen This European Standard was approved by CEN on 14 October 2004 and includes Amendment 1 approved by CEN on 3 February 2009.
CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this European Standard the status of a national standard without any alteration. Up-to-date lists and bibliographical references concerning such national standards may be obtained on application to the CEN Management Centre or to any CEN member.
This European Standard exists in three official versions (English, French, German). A version in any other language made by translation under the responsibility of a CEN member into its own language and notified to the CEN Management Centre has the same status as the official versions.
CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom.
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Avenue Marnix 17,
B-1000 Brussels © 2009 CEN All rights of exploitation in any form and by any means reserved worldwide for CEN national Members. Ref. No. EN 14279:2004+A1:2009: ESIST EN 14279:2005+A1:2009
EN 14279:2004+A1:2009 (E) 2 Contents page Foreword .3 Introduction .4 1 Scope .5 2 Normative references .5 3 Terms and definitions .6 4 Classification .7 5 Requirements .7 5.1 General requirements .7 5.2 Formaldehyde .8 5.3 Additional requirements for LVL/1: LVL for use in dry conditions .9 5.3.1 Bonding quality .9 5.3.2 Biological durability .9 5.4 Additional requirements for LVL/2: LVL for use in humid conditions .9 5.4.1 Bonding quality .9 5.4.2 Biological durability .9 5.5 Additional requirements for LVL/3: LVL for use in exterior conditions .9 5.5.1 Bonding quality .9 5.5.2 Biological durability .9 6 Supplementary properties .9 7 Verification . 10 7.1 General . 10 7.2 External control . 10 7.3 Factory production control . 10 8 Marking, identification and documentation . 11 Annex A (normative)
Evaluation of the bonding quality of laminated veneer lumber . 12 Annex B (informative)
Supplementary properties . 23 Bibliography . 24
SIST EN 14279:2005+A1:2009
EN 14279:2004+A1:2009 (E) 3 Foreword This document (EN 14279:2004+A1:2009) has been prepared by Technical Committee CEN/TC 112 “Wood-based panels”, the secretariat of which is held by DIN. This European Standard shall be given the status of a national standard, either by publication of an identical text or by endorsement, at the latest by September 2009, and conflicting national standards shall be withdrawn at the latest by September 2009. This document includes Amendment 1, approved by CEN on 2009-02-03. This document supersedes EN 14279:2004. The start and finish of text introduced or altered by amendment is indicated in the text by tags ! ". According to the CEN/CENELEC Internal Regulations, the national standards organizations of the following countries are bound to implement this European Standard: Austria, Belgium, Bulgaria, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom. SIST EN 14279:2005+A1:2009
EN 14279:2004+A1:2009 (E) 4 Introduction LVL is covered by two standards:
EN 14374 and EN 14279 (this document), prepared under Mandates M/112 and M/113 respectively. In the field of application of Mandate M/112 "Structural timber products and ancillaries", LVL is a material used for manufacturing structural products. In the field of application of Mandate M/113 "Wood-based panels", LVL is a product. The fields of application are to some extent overlapping. In some cases, the standard to be used is specified in the design standards, in other cases it is up to the user to specify the standard to be used. For relationship with Council Directive 89/106/EEC, EN 14374:2004 has its own Annex ZA. EN 14279 applies to LVL products for general purposes as well as to LVL products for use in construction, for relationship with Council Directive 89/106/EEC, refer to Annex ZA of EN 13986:2004. This document has been prepared in concert with CEN/TC 124. Consequently, some parts are common with EN 14374, e.g. some definitions and general specifications. SIST EN 14279:2005+A1:2009
EN 14279:2004+A1:2009 (E) 5 1 Scope This document gives definitions, a classification and specifies the requirements for Laminated Veneer Lumber (LVL) for general purposes or for use in construction in dry, humid or exterior conditions. NOTE This standard will be called up in EN 13986 for construction applications. Annex A "Evaluation of the bonding quality of laminated veneer lumber" is normative Information on supplementary properties is given in Annex B. 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. EN 310, Wood-based panels — Determination of modulus of elasticity in bending and of bending strength EN 314-1, Plywood — Bonding quality — Part 1: Test methods EN 314-2, Plywood — Bonding quality — Part 2: Requirements EN 315, Plywood — Tolerances for dimensions EN 322, Wood-based panels — Determination of moisture content EN 323, Wood-based panels — Determination of density EN 324-1, Wood-based panels — Determination of dimensions of boards — Part 1: Determination of thickness, width and length EN 324-2, Wood-based panels — Determination of dimensions of boards — Part 2: Determination of squareness and edge straightness EN 326-1, Wood-based panels — Sampling, cutting and inspection — Part 1: Sampling and cutting of test pieces and expression of test results EN 326-2, Wood based panels — Sampling, cutting and inspection — Part 2: Quality control in the factory EN 326-3, Wood based panels — Sampling, cutting and inspection — Part 3: Inspection of an isolated lot of panels EN 335-3, Durability of wood and wood-based products — Definition of hazard classes of biological attack — Part 3: Application to wood-based panels EN 408, Timber structures — Structural timber and glued laminated timber — Determination of some physical and mechanical properties EN 635-2, Plywood — Classification by surface appearance — Part 2: Hardwood EN 635-3, Plywood — Classification by surface appearance — Part 3: Softwood EN 635-5, Plywood — Classification by surface appearance — Part 5: Methods for measuring and expressing characteristics and defects SIST EN 14279:2005+A1:2009
EN 14279:2004+A1:2009 (E) 6 EN 717-1, Wood-based panels — Determination of formaldehyde release — Part 1: Formaldehyde emission by the chamber method EN 717-2, Wood-based panels — Determination of formaldehyde release — Part 2: Formaldehyde release by the gas analysis method EN 789, Timber structures – Test methods – Determination of mechanical properties of wood based panels EN 1058, Wood-based panels – Determination of characteristic values of mechanical properties and density EN 13986:2004 Wood-based panels for use in construction — Characteristics, evaluation of conformity and marking EN 14374, Timber structures – Structural laminated veneer lumber (LVL) – Requirements 3 Terms and definitions For the purposes of this document, the following terms and definitions apply. 3.1 laminated veneer lumber – LVL layered composite of wood veneers with fibres principally in the same direction NOTE This definition does not preclude the inclusion of cross banded veneers. 3.2 lay-up composition of LVL with regard to number of veneers and their direction 3.3 dry conditions conditions corresponding to service class 1 of !EN 1995-1-1" which is characterised by a moisture content in the material corresponding to a temperature of 20 °C and a relative humidity of the surrounding air only exceeding 65 % for a few weeks per year [EN 13986:2004] 3.4 humid conditions conditions corresponding to service class 2 of !EN 1995-1-1" which is characterised by a moisture content in the material corresponding to a temperature of 20°C and a relative humidity of the surrounding air only exceeding 85 % for a few weeks per year [EN 13986:2004] 3.5 exterior conditions conditions corresponding to service class 3 of !EN 1995-1-1" which is characterised by climatic conditions leading to higher moisture contents than in service class 2 [EN 13986:2004] SIST EN 14279:2005+A1:2009
EN 14279:2004+A1:2009 (E) 7 4 Classification Three types of LVL are classified: LVL/1 for use in dry conditions LVL/2 for use in humid conditions LVL/3 for use in exterior conditions 5 Requirements 5.1 General requirements LVL shall comply with the general requirements listed in Table 1 when dispatched from the production factory. The requirements in Table 1 shall be met by the mean or percentile value given, calculated in accordance with EN 326-1. The bending properties according to Table 1 are used for quality control purposes only and shall not be used in design calculations. For structural applications, the characteristic values of mechanical properties shall be determined according to EN 1058 from EN 789 test results or EN 408 or methods referred to EN 14374. NOTE If it is made known by the purchaser that the boards are intended for specific use in flooring, walls or roofing, the performance standard EN 12871 also should be considered. This might result a need for compliance with additional requirements. Table 1 — General requirements for all LVL Types No Property Test method Requirement 1a
Tolerances on dimensions — Thickness (sanded) within and between LVLs — Thickness (unsanded) within and between LVLs — Length and width
EN 324-1
EN 315 2a Edge straightness tolerance
EN 324-2 ≤ 1,5 mm/m 3a Squareness tolerance
EN 324-2 ≤ 2,0 mm/m 4
Moisture content
EN 322 6 % to 12 % 5
Tolerance on the mean density within a LVL
EN 323 ± 10 % 6
Bending strength — major axis — minor axis
EN 310
5th percentile Value determined at the initial testing of the product with regard to actual lay-up, density, veneer thickness and veneer grades 7
Modulus of elasticity in bending — major axis — minor axis
EN 310
8
Bonding quality
EN 314-1 In connection
with Annex A Shear strength and wood fibre failure in accordance with EN 314-2 9
Veneer grade — Hardwood
— Softwood
EN 635-5
EN 635-2 appearance class EN 635-3 appearance class a Certain uses of LVL can require other tolerances: see separate performance standards. SIST EN 14279:2005+A1:2009
EN 14279:2004+A1:2009 (E) 8 5.2 Formaldehyde For use in construction, refer to EN 13986. For use in non constructional applications, the following applies: LVL shall be tested and classified into either class E 1 or E 2. NOTE 1 In certain countries only products of the formaldehyde class E1 may be placed on the market (see the database “Legislation on substances in construction products” http://europa.eu.int/comm/enterprise/construction/internal/dangsub/dangmain.htm, for further information). The test requirements for both initial type testing and factory production control/continuous surveillance are laid down in Table 2 for E1 products and Table 3 for E2 products. NOTE 2 Boards of class E1 can be used without causing an indoor air concentration greater than 0,1 ×10-6 (ppm) HCHO in conditions according to EN 717-1. The test requirement does not apply to LVL which has not had formaldehyde containing materials added during production or in post-production processing. These may be classified E1 without testing. NOTE 3 Example of such LVL (coated or uncoated) are those glued with resins emitting either no formaldehyde or negligible amounts of formaldehyde after production as e.g. isocyanate, or phenolic glue. NOTE 4 The limit values for the class E1 are given in Table 2 and for class E2 are given in Table 3. Table 2 — Definition of formaldehyde class E1 Initial type testinga
Test method EN 717-1 Requirement Release ≤ 0,124 mg/m3 air Factory production control Test method EN 717-2 Requirement Release ≤ 3,5 mg/m2 h or ≤ 5 mg/m2 h within 3 days after production a For established products, initial testing may also be done on the basis of existing data with EN 717-2 testing, either from factory production control or from external inspection.
Table 3 — Definition of formaldehyde class E2 Initial type testing either Test method EN 717-1 Requirement Release > 0,124 mg/m3 air or Test method EN 717-2 Requirement Release > 3,5 mg/m2 h to ≤ 8 mg/m2 h or > 5 mg/m2 h to ≤ 12 mg/m2 h within 3 days after production Factory production control Test method EN 717-2 Requirement Release > 3,5 mg/m2 h to ≤ 8 mg/m2 h or > 5 mg/m2 h to ≤ 12 mg/m2h within 3 days after production
SIST EN 14279:2005+A1:2009
EN 14279:2004+A1:2009 (E) 9 5.3 Additional requirements for LVL/1: LVL for use in dry conditions 5.3.1 Bonding quality The bonding quality shall comply with the requirements of bonding class 1 of EN 314-2. The evaluation of the bonding quality of LVL is given in Annex A. 5.3.2 Biological durability LVL shall be appropriate for prevailing climatic conditions. The risk of attack is outlined in use class 1 of EN 335-3. NOTE Guidance on factors effecting durability and on precautionary measures which may be considered as necessary can be found in !CEN/TS 1099". 5.4 Additional requirements for LVL/2: LVL for use in humid conditions 5.4.1 Bonding quality The bonding quality shall comply with the requirements of bonding class 2 of EN 314-2. The evaluation of the bonding quality of LVL is given in Annex A. 5.4.2 Biological durability LVL shall be appropriate for prevailing climatic conditions. The risk of attack is outlined in use class 2 of EN 335-3. NOTE Guidance on factors effecting durability and on precautionary measures which may be considered as necessary can be found in !CEN/TS 1099". 5.5 Additional requirements for LVL/3: LVL for use in exterior conditions 5
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