1、BRITISH STANDARDBS EN 14279:2004+A1:2009Laminated Veneer Lumber (LVL) Definitions, classification and specificationsICS 79.060.20; 79.080g49g50g3g38g50g51g60g44g49g42g3g58g44g55g43g50g56g55g3g37g54g44g3g51g40g53g48g44g54g54g44g50g49g3g40g59g38g40g51g55g3g36g54g3g51g40g53g48g44g55g55g40g39g3g37g60g3g
2、38g50g51g60g53g44g42g43g55g3g47g36g58National forewordThis British Standard is the UK implementation of EN 14279:2004+A1:2009. It supersedes BS EN 14279:2004 which is withdrawn.The start and finish of text introduced or altered by amendment is indicated in the text by tags. Tags indicating changes t
3、o CEN text carry the number of the CEN amendment. For example, text altered by CEN amendment A1 is indicated by !“.The UK participation in its preparation was entrusted to Technical Committee B/541, Wood based panels.A list of organizations represented on this committee can be obtained on request to
4、 its secretary.This publication does not purport to include all the necessary provisions of a contract. Users are responsible for its correct application.Compliance with a British Standard cannot confer immunity from legal obligations.BS EN 14279:2004+A1:2009This British Standard was published under
5、 the authority of the Standards Policy and Strategy Committee on 16 January 2006 BSI 2010Amendments/corrigenda issued since publicationDate Comments 31 March 2010 Implementation of CEN amendment A1:2009ISBN 978 0 580 64048 3EUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN 14279:2004+A1 March 200
6、9 ICS 79.080; 79.060.20 Supersedes EN 14279:2004English Version Laminated Veneer Lumber (LVL) - Definitions, classification and specifications Lamibois (LVL) - Dfinitions, classification et spcifications Furnierschichtholz (LVL) - Definitionen, Klassifizierung und Spezifikationen This European Stand
7、ard 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.
8、 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 translatio
9、n 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, Gr
10、eece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom. EUROPEAN COMMITTEE FOR STANDARDIZATION COMIT EUROPEN DE NORMALISATION EUROPISCHES KOMITEE FR NORMUNG Manage
11、ment Centre: 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: EEN 14279:2004+A1:2009 (E) 2 Contents page Foreword 3 Introduction .4 1 Scope 5 2 Normative references 5 3 Term
12、s 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
13、.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
14、 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 BS EN 14279:2004+A1:2009EN 14279:2004+A1:2009 (E) 3 Foreword This document (EN 14279:
15、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
16、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 ! “. Accordin
17、g 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,
18、Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom. BS EN 14279:2004+A1:2009EN 14279:2004+A1:2009 (E) 4 Introduction LVL is covered by two standards: EN 14374 and EN 14279 (this document), prepared under Man
19、dates 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 a
20、re 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
21、 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 g
22、eneral specifications. BS EN 14279:2004+A1:2009EN 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 standa
23、rd 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 applica
24、tion 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
25、 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 dimension
26、s 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 ex
27、pression 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
28、 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 Clas
29、sification by surface appearance Part 3: Softwood EN 635-5, Plywood Classification by surface appearance Part 5: Methods for measuring and expressing characteristics and defects BS EN 14279:2004+A1:2009EN 14279:2004+A1:2009 (E) 6 EN 717-1, Wood-based panels Determination of formaldehyde release Part
30、 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 Dete
31、rmination 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 purp
32、oses 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
33、 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 week
34、s 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 20C and a relative humidity of the surrounding air only exceeding 85 % for a few weeks per year EN
35、 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 BS EN 14279:2004+A1:2009EN 14279:2004+A1:2009 (E) 7 4 Classification Three types of
36、 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
37、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 prop
38、erties 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
39、 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
40、Edge straightness tolerance EN 324-2 1,5 mm/m 3aSquareness 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 5thpercentile Value determined at the initial testing of the product w
41、ith 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 E
42、N 635-2 appearance class EN 635-3 appearance class aCertain uses of LVL can require other tolerances: see separate performance standards. BS EN 14279:2004+A1:2009EN 14279:2004+A1:2009 (E) 8 5.2 Formaldehyde For use in construction, refer to EN 13986. For use in non constructional applications, the f
43、ollowing 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/constructio
44、n/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
45、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 o
46、f 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 Defini
47、tion of formaldehyde class E1 Initial type testingaTest method EN 717-1 Requirement Release 0,124 mg/m3air Factory production control Test method EN 717-2 Requirement Release 3,5 mg/m2h or 5 mg/m2h within 3 days after production aFor established products, initial testing may also be done on the basi
48、s 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/m3air or Test method EN 717-2 Requirement Release 3,5 mg/m2h to 8 mg
49、/m2h or 5 mg/m2h to 12 mg/m2 h within 3 days after production Factory production control Test method EN 717-2 Requirement Release 3,5 mg/m2h to 8 mg/m2h or 5 mg/m2h to 12 mg/m2h within 3 days after production BS EN 14279:2004+A1:2009EN 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
