EN 14279:2004

2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.Laminirani furnir (LVL) – Definicije, klasifikacija in specifikacijeFurnierschichtholz (LVL) - Definitionen, Klassifizierung und SpezifikationenLamibois (LVL) - Définitions, classification et spécificationsLaminated Veneer Lumber (LVL) - Definitions, classification and specifications79.060.99Other wood-based panelsICS:Ta slovenski standard je istoveten z:EN 14279:2004SIST EN 14279:2005en01-marec-2005SIST EN 14279:2005SLOVENSKI
STANDARD
EUROPEAN STANDARDNORME EUROPÉENNEEUROPÄISCHE NORMEN 14279December 2004ICS 79.060.20; 79.080English versionLaminated Veneer Lumber (LVL) - Definitions, classification andspecificationsLamibois (LVL) - Définitions, classification et spécificationsFurnierschichtholz (LVL) - Definitionen, Klassifizierung undSpezifikationenThis European Standard was approved by CEN on 14 October 2004.CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this EuropeanStandard the status of a national standard without any alteration. Up-to-date lists and bibliographical references concerning such nationalstandards may be obtained on application to the Central Secretariat or to any CEN member.This European Standard exists in three official versions (English, French, German). A version in any other language made by translationunder the responsibility of a CEN member into its own language and notified to the Central Secretariat has the same status as the officialversions.CEN members are the national standards bodies of Austria, Belgium, Cyprus, Czech Republic, Denmark, Estonia, Finland, France,Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Slovakia,Slovenia, Spain, Sweden, Switzerland and United Kingdom.EUROPEAN COMMITTEE FOR STANDARDIZATIONCOMITÉ EUROPÉEN DE NORMALISATIONEUROPÄISCHES KOMITEE FÜR NORMUNGManagement Centre: rue de Stassart, 36
B-1050 Brussels© 2004 CENAll rights of exploitation in any form and by any means reservedworldwide for CEN national Members.Ref. No. EN 14279:2004: ESIST EN 14279:2005

Evaluation of the bonding quality of laminated veneer lumber.12 Annex B (informative)
Supplementary properties.22 Bibliography.23
According to the CEN/CENELEC Internal Regulations, the national standards organizations of the following countries are bound to implement this European Standard: Austria, Belgium, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom. SIST EN 14279:2005

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

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 ENV 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 ENV 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 ENV 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

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
Modulus of elasticity in bending — 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 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

Requirement Release ≤ 0,124 mg/m3 air Test method EN 717-2 Factory production control 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 Test method EN 717-1 either Requirement Release > 0,124 mg/m3 air Test method EN 717-2 Initial type testing or 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 Test method EN 717-2 Factory production control 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
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