BSI 16/30337793 DC:2016 Edition
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BS EN 14374. Timber structures. Laminated veneer lumber (LVL). Requirements
| Published By | Publication Date | Number of Pages |
| BSI | 2016 | 78 |
PDF Catalog
| PDF Pages | PDF Title |
|---|---|
| 7 | European foreword |
| 8 | 1 Scope 2 Normative references |
| 10 | 3 Terms and definitions |
| 11 | Figure 1 — Laminated veneer lumber without and with crossband veneers |
| 12 | 4 Symbols 4.1 Main symbols |
| 13 | 4.2 Subscripts 5 Classification |
| 14 | 6 Material characteristics and testing, assessment and sampling methods 6.1 Modulus of elasticity, bending, compressive, tensile and shear strength of structural LVL 6.2 Strength and stiffness under point load of structural LVL (punching shear) 6.3 Racking resistance of structural LVL |
| 15 | 6.4 Impact resistance of structural LVL 6.5 Embedment strength of fasteners in structural LVL 6.6 Mechanical durability (i.e. duration of load and creep) of structural LVL 6.7 Bonding strength and durability of bonding strength (also covering moisture resistance) of structural and non-structural LVL 6.7.1 Bonding strength and durability of bonding strength of structural LVL |
| 16 | 6.7.2 Bonding strength and durability of bonding strength of structural and non-structural LVL 6.8 Dimensional stability of structural and non-structural LVL (also covering durability-swelling in thickness) Figure 2 — Example of the angle α of a cross section of laminated veneer lumber |
| 17 | Table 1 — Maximum deviations from nominal sizes and nominal angles for laminated veneer lumber not treated by pressure treatment 6.9 Durability of other characteristics against biological attack of structural and non-structural LVL 6.9.1 Laminated veneer lumber without preservative treatment 6.9.2 Laminated veneer lumber with preservative treatment against biological attack |
| 18 | 6.10 Resistance to fire of structural LVL 6.11 Reaction to fire of structural and non-structural LVL 6.11.1 General |
| 19 | Table 2 — Classes of reaction to fire performance for wood-based panels0F ),1F ) 6.11.2 Determination from tests 6.11.2.1 General |
| 20 | 6.11.2.2 Determination from tests for all end-uses (except flooring) for standard mounting and fixing conditions Figure 3 — Top view of fixing system for reaction to fire test (except flooring) according to EN 13823 |
| 21 | 6.11.2.3 Determination from tests for all end-uses (including flooring) for other mounting and fixing conditions 6.12 Fire protection ability Table 3 — Classes of fire protection ability for wood-based panels as wall and ceiling coverings2F ),3F ) 6.13 Release of formaldehyde of structural and non-structural LVL |
| 22 | 6.14 Release/content of other dangerous substances (also covering release/content of pentachlorphenol (PCP)) of structural and non-structural LVL 6.15 Water vapour permeability of structural and non-structural LVL Table 4 — Water vapour resistance factor µ for laminated veneer lumber as given for plywood in EN ISO 10456 6.16 Airborne sound insulation (surface mass) of structural and non-structural LVL 6.16.1 General 6.16.2 Determination by calculation |
| 23 | 6.17 Sound adsorption of structural and non-structural LVL 6.18 Thermal conductivity of structural and non-structural LVL Table 5 — Thermal conductivity λ for laminated veneer lumber 6.19 Air permeability of structural and non-structural LVL 6.20 Supplementary properties of structural and non-structural LVL 7 Assessment and Verification of Constancy of Performance (AVCP) 7.1 General |
| 24 | 7.2 Type testing 7.2.1 General 7.2.2 Test samples, testing and compliance criteria |
| 25 | Table 6 — Numbers of samples to be tested and compliance criteria for structural laminated veneer lumber |
| 30 | Table 7 — Numbers of samples to be tested and compliance criteria for non-structural laminated veneer lumber |
| 32 | 7.2.3 Test reports 7.2.4 Shared other party results 7.2.5 Cascading determination of the product type results 7.2.6 Additional provisions for declaration of mechanical resistance and resistance to fire by design methods 7.3 Factory production control (FPC) 7.3.1 General 7.3.2 Provisions 7.3.2.1 General |
| 33 | 7.3.2.2 Equipment 7.3.2.2.1 Testing 7.3.2.2.2 Manufacturing 7.3.2.3 Raw materials and components |
| 34 | 7.3.2.4 Traceability and marking 7.3.2.5 Controls during manufacturing process 7.3.2.6 Product testing and evaluation |
| 35 | Table 8 — Factory production control for structural laminated veneer lumber |
| 40 | Table 9 — Factory production control for non – structural laminated veneer lumber |
| 41 | 7.3.2.7 Non-complying products |
| 42 | 7.3.2.8 Corrective action 7.3.2.9 Handling, storage and packaging 7.3.3 Product specific provisions |
| 43 | 7.3.4 Initial inspection of factory and of FPC 7.3.4.1 General 7.3.4.2 When mechanical and fire resistance performances are to be declared using method M1 or method M3a 7.3.4.3 When mechanical and fire resistance performances are to be declared using method M2 or method M3b 7.3.5 Continuous surveillance of FPC 7.3.6 Procedure for modifications |
| 44 | 8 Marking and labelling |
| 45 | Annex A (normative) Testing of strength, stiffness and density properties of laminated veneer lumber A.1 General |
| 46 | Table A.1 — Designation of strengths, moduli of elasticity and shear moduli |
| 47 | A.2 Edgewise bending strength and edgewise modulus of elasticity in bending parallel to the grain of the face veneers A.3 Edgewise bending strength, edgewise modulus of elasticity and edgewise shear strength in bending perpendicular to the grain of the face veneers |
| 48 | A.4 Flatwise bending strength and flatwise modulus of elasticity in bending parallel to the grain of the face veneers A.5 Flatwise bending strength and flatwise modulus of elasticity in bending perpendicular to the grain of the face veneers A.6 Tension strength and modulus of elasticity in tension parallel to the grain of the face veneers A.7 Edgewise tension strength in plane of the veneers and perpendicular to the grain of the face veneers |
| 49 | A.8 Compression strength and modulus of elasticity in compression parallel to the grain of the face veneers A.9 Edgewise compression strength and edgewise modulus of elasticity in compression in plane of the veneers and perpendicular to the grain of the face veneers A.10 Flatwise compression strength and flatwise modulus of elasticity perpendicular to the plane of the veneers A.11 Edgewise shear strength and edgewise shear modulus parallel to the grain of the face veneers A.12 Flatwise shear strength and flatwise shear modulus parallel to the grain of the face veneers |
| 50 | A.13 Flatwise shear strength and flatwise shear modulus perpendicular to the grain of the face veneers A.14 Density A.15 Moisture content |
| 51 | Annex B (normative) Strength classes for structural laminated veneer lumber B.1 General B.2 LVL without cross-band veneers Table B.1 — Strength classes for structural LVL without crossband veneers |
| 53 | B.3 LVL with crossband veneers Table B.2 — Strength classes for structural LVL with crossband veneers |
| 55 | Annex C (normative) Layup factors for laminated veneer lumber with cross-band veneers C.1 General Table C.1 — Calculation of characteristic strength and stiffness values for layup 2 by using characteristic strength and stiffness values of the tested reference layup 1 |
| 56 | C.2 Determination of layup factors for LVL made from one species |
| 57 | Figure C.1 — Example for the definition of effective veneer thicknesses am-i in laminated veneer lumber with cross-band veneers (here: m = 9) C.3 Layup factors for LVL made of different species |
| 58 | Annex D (normative) Testing of bonding quality for structural LVL D.1 Specimens D.2 Tests D.3 Report |
| 59 | Annex E (normative) Testing of bonding strength for non-structural LVL E.1 General E.2 Test pieces E.2.1 Preparation of test pieces E.2.1.1 General E.2.1.2 Layers with one or two plies in one direction E.2.1.2.1 General E.2.1.2.2 Face layer (Figure E.1) |
| 60 | E.2.1.2.3 Core layers (Figure E.1) E.2.1.3 Layers with more than 2 plies E.2.1.3.1 General |
| 61 | Figure E.1 — Shear strength test specimen comprising a core layer made of one or two veneers (above: specimen to test the glue line of a face layer; below: specimen to test the glue line of a core layer) E.2.1.3.2 Testing with a single pair of glue lines to be tested (Figure E.2) |
| 62 | Figure E.2 — Tension shear strength test specimens for tests with a single pair of glue-lines for LVL having layers comprising more than two veneers E.2.1.3.3 Testing with more than one pair of glue lines (Figure E.3 and Figure E.4) |
| 63 | Figure E.3 — Compression shear strength test specimens for tests with more than a single pair of glue-lines for LVL having layers comprising more than two veneers |
| 64 | Figure E.4 — Principe of a compression shear jig for LVL E.2.2 Sampling E.2.2.1 General |
| 65 | E.2.2.2 Lay-ups with layers of 1 or two plies in one direction (Figure E.1) E.2.2.3 Lay-ups with more than 2 plies in one direction (Figure E.2 and Figure E.3) |
| 66 | E.3 Apparatus E.3.1 Equipment for pre-treatment E.3.2 Apparatus for tensile shear E.3.3 Additional apparatus for compression shear E.3.4 Evaluation of the wood fibre failure E.4 Procedure E.5 Evaluation of test results |
| 67 | Annex F (normative) Release of formaldehyde F.1 General F.2 Classification Table F.1 — Release of formaldehyde classes F.3 Test procedure and test report |
| 68 | Annex G (informative) Supplementary characteristics G.1 General Table G.1 — Test and assessment methods and reference documents for supplementary properties |
| 69 | Annex H (informative) Supplementary design rules H.1 General H.2 Deformation factors kdef Table H.1 — Deformation factors kdef H.3 Provisions for compression perpendicular to the grain Table H.2 — kc,90-values and increase of the actual contact length for the design of compression strength perpendicular to the grain according to EN 1995-1-1 |
| 70 | H.4 Charring rate |
| 71 | Annex ZA (informative) Relationship of this European Standard with Regulation (EU) No. 305/2011 ZA.1 Scope and relevant characteristics Table ZA.1.1 — Relevant clauses for structural laminated veneer lumber |
| 75 | ZA.2 System of Assessment and Verification of Constancy of Performance (AVCP) ZA.3 Assignment of AVPC tasks Table ZA.3.1 — Assignment of AVCP tasks for structural and non-structural laminated veneer lumber under system 1 |
| 76 | Table ZA.3.2— Assignment of AVCP tasks for non-structural laminated veneer lumber under system 3 |
| 77 | Table ZA.3.3 — Assignment of AVCP tasks for non-structural laminated veneer lumber under system 4 |
| 78 | Bibliography |
