SIST EN 14279:2005+A1:2009

Laminated Veneer Lumber (LVL) - Definitions, classification and specifications

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.

Furnierschichtholz (LVL) - Definitionen, Klassifizierung und Spezifikationen

Lamibois (LVL) - Définitions, classification et spécifications

Slojnat furnirni les (LVL) - Definicije, klasifikacija in specifikacije

General Information

• Status: Published
• Publication Date: 27-May-2009
• ICS: 79.060.99 - Other wood-based panels
• Technical Committee: LLZ - Les, lesni izdelki in zaščita lesa
• Current Stage: 6060 - National Implementation/Publication (Adopted Project)
• Start Date: 25-Mar-2009
• Due Date: 30-May-2009
• Completion Date: 28-May-2009
• Ref Project: EN 14279:2004+A1:2009 - Laminated Veneer Lumber (LVL) - Definitions, classification and specifications

Relations

• Replaces: SIST EN 14279:2005/kprA1:2008 - Laminated Veneer Lumber (LVL) - Definitions, classification and specifications
• Effective Date: 18-Nov-2011
• Replaces: SIST EN 14279:2005 - Laminated Veneer Lumber (LVL) - Definitions, classification and specifications
• Effective Date: 01-Jul-2009
• Consolidates: SIST EN 14279:2005/kprA1:2008 - Laminated Veneer Lumber (LVL) - Definitions, classification and specifications
• Effective Date: 18-Jan-2023
• Consolidates: SIST EN 14279:2005 - Laminated Veneer Lumber (LVL) - Definitions, classification and specifications
• Effective Date: 18-Jan-2023
• Revises: kSIST FprEN 14374:2019 - Timber structures - Laminated veneer lumber (LVL) - Requirements
• Effective Date: 18-Jan-2023
• Revised: kSIST FprEN 14374:2019 - Timber structures - Laminated veneer lumber (LVL) - Requirements
• Effective Date: 01-Jul-2016

Overview

EN 14279:2004+A1:2009 is the CEN European standard that defines Laminated Veneer Lumber (LVL) - its definitions, classification and minimum specifications for LVL intended for general purposes or for use in construction under dry, humid or exterior conditions. The standard prescribes quality, dimensional and performance requirements, and includes a normative Annex A for evaluation of bonding quality and an informative Annex B on supplementary properties. For construction applications, EN 14279 is referenced by EN 13986.

Key topics and technical requirements

• Scope & classification
  • LVL types: LVL/1 (dry), LVL/2 (humid), LVL/3 (exterior) - mapped to service classes per EN 1995-1-1 and biological hazard classes in EN 335-3.
• Dimensional and physical tolerances
  • Specified thickness, length/width and squareness/edge straightness tolerances (e.g., edge straightness ≤ 1.5 mm/m, squareness ≤ 2.0 mm/m).
  • Moisture content requirement: 6% to 12%.
  • Density tolerance: mean density ±10% within a board.
• Bonding quality
  • Bonding classes follow EN 314-2: LVL/1 (bonding class 1), LVL/2 (class 2), LVL/3 (class 3). Annex A gives the LVL-specific evaluation method.
• Formaldehyde emissions
  • Classification into E1 or E2 (EN 717 test methods). Example limits: EN 717-1 chamber method ≤ 0.124 mg/m3 for E1; EN 717-2 gas analysis factory control limits are also defined.
• Mechanical properties & verification
  • Bending strength and modulus of elasticity are specified for quality control (EN 310). For structural design, characteristic values must be determined per EN 1058, EN 408 or EN 14374 methods.
  • Verification and factory production control follow EN 326-1/2/3 and external inspection procedures.

Applications and practical value

• Use for specifying and procuring LVL in:
  • Structural components (beams, lintels, roof members) when combined with design standards.
  • Non-structural and general-purpose panels where controlled dimensional stability, bonding and emissions are required.
• Ensures consistent quality, safe bonding performance for moisture exposure levels, and regulated formaldehyde emissions for indoor air quality.
• Helps manufacturers implement factory production control and buyers to verify conformity.

Who uses this standard

• LVL manufacturers, quality managers and production engineers
• Structural and timber designers specifying LVL for different service classes
• Construction product certifiers, procurement officers and building regulators
• Test laboratories performing EN 314 / EN 717 / EN 310 test methods

Related standards

• EN 13986 (wood-based panels for construction), EN 14374 (structural LVL), EN 314 (bonding quality), EN 717 (formaldehyde), EN 326 (sampling/inspection), EN 1058 / EN 408 (mechanical properties).

Standards Content (Sample)

2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.Slojnat furnirni les (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 14279:2004+A1:2009SIST EN 14279:2005+A1:2009en,fr,de01-julij-2009SIST EN 14279:2005+A1:2009SLOVENSKI
STANDARDSIST EN 14279:2005/kprA1:2008SIST EN 14279:20051DGRPHãþD

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.
EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION EUROPÄISCHES KOMITEE FÜR NORMUNG
Management 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: ESIST EN 14279:2005+A1:2009

Evaluation of the bonding quality of laminated veneer lumber . 12 Annex B (informative)
Supplementary properties . 23 Bibliography . 24
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

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
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

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
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