prEN 12369-2

SLOVENSKI STANDARD
01-julij-2024
Lesne plošče - Karakteristične vrednosti za konstrukcijsko načrtovanje - 2. del:
Vezane plošče
Wood-based panels - Characteristic values for structural design - Part 2: Plywood
Holzwerkstoffe - Charakteristische Werte für die Berechnung und Bemessung von
Holzbauwerken - Teil 2: Sperrholz
Panneaux à base de bois - Valeurs caractéristiques pour la conception des structures -
Partie 2: Contreplaqué
Ta slovenski standard je istoveten z: prEN 12369-2
ICS:
79.060.10 Vezan les Plywood
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

DRAFT
EUROPEAN STANDARD
NORME EUROPÉENNE
EUROPÄISCHE NORM
May 2024
ICS 79.060.10 Will supersede EN 12369-2:2011
English Version
Wood-based panels - Characteristic values for structural
design - Part 2: Plywood
Panneaux à base de bois - Valeurs caractéristiques Holzwerkstoffe - Charakteristische Werte für die
pour la conception des structures - Partie 2: Berechnung und Bemessung von Holzbauwerken - Teil
Contreplaqué 2: Sperrholz
This draft European Standard is submitted to CEN members for enquiry. It has been drawn up by the Technical Committee
CEN/TC 112.
If this draft becomes a European Standard, 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.

This draft European Standard was established by CEN 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-CENELEC
Management Centre has the same status as the official versions.

CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia,
Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway,
Poland, Portugal, Republic of North Macedonia, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Türkiye and
United Kingdom.
Recipients of this draft are invited to submit, with their comments, notification of any relevant patent rights of which they are
aware and to provide supporting documentation.

Warning : This document is not a European Standard. It is distributed for review and comments. It is subject to change without
notice and shall not be referred to as a European Standard.

EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION

EUROPÄISCHES KOMITEE FÜR NORMUNG

CEN-CENELEC Management Centre: Rue de la Science 23, B-1040 Brussels
© 2024 CEN All rights of exploitation in any form and by any means reserved Ref. No. prEN 12369-2:2024 E
worldwide for CEN national Members.

Contents Page
European foreword . 3
1 Scope . 4
2 Normative references . 4
3 Terms and definitions . 5
4 Symbols . 6
4.1 Main symbols . 6
4.2 Subscripts . 7
5 General. 7
6 Characteristic values for plywood . 8
6.1 Introduction . 8
6.2 Bending, tension and compression . 8
6.2.1 General. 8
6.2.2 Strength . 8
6.2.3 Modulus of elasticity . 9
6.3 Shear properties. 11
6.4 Characteristic density and mean density . 11
7 Material property values to be used for the structural design according to
EN 1995-1-1 . 12
7.1 General. 12
7.2 Additional supplementary material properties for Eurocode 5 (EN 1995-1-1,
EN 1995-1-2, EN 1995-2) . 13
7.2.1 Mean density (ρ ) and characteristic density (ρ ) . 13
mean k
7.2.2 Characteristic modulus of elasticity and rigidity values . 14
7.2.3 Compressive strength (f ) bearing and compressive and tensile stiffness
c,flat,k
(E and E ), out of plane . 14
ct,flat,mean ct,flat,k
7.2.4 Tensile strength (f ) perpendicular to the face of the panel, out of plane . 14
t,flat,k
7.2.5 Bending strength (f and f ) in edgewise loading, out of plane . 15
m,0,efge,k m,90,efge,k
Annex A (informative) Format for the presentation of characteristic values . 16
Annex B (informative) Information about the conversion factors . 18
Bibliography . 20

European foreword
This document (prEN 12369-2:2024) has been prepared by Technical Committee CEN/TC 112 “Wood-
based panels”, the secretariat of which is held by DIN.
This document is currently submitted to the CEN Enquiry.
This document will supersede EN 12369-2:2011.
EN 12369-2:2011:
— where values required by prEN 1995-1-1 for plywood panels have been missing, this document
provides additional properties in Clause 7 to be used in the structural design according to
EN 1995-1-1;
— the symbols used in wood-based panels product standards, test standards and in EN 1991-1-1 do not
match exactly to each other. This document gives advice how to use design properties when the
structural design is performed according to EN 1995-1-1;
— normative reference to ISO 3131 replaced by reference to ISO 13061-2;
— values for classes F 35 and E 35 mentioned in EN 636 introduced by interpolation.
This document is intended to be used in conjunction with EN 1995-1-1.
The EN 12369 series Wood-based panels — Characteristic values for structural design is currently
composed of the following parts:
— Part 1: OSB, particleboards and fibreboards;
— Part 2: Plywood;
— Part 3: Solid wood panels.
Annex A and Annex B are informative.
This document has been prepared under a standardization request addressed to CEN by the European
Commission. The Standing Committee of the EFTA States subsequently approves these requests for its
Member States.
1 Scope
This document provides information on the characteristic values for use in designing structures
incorporating wood-based panels. The characteristic values given are as defined in EN 1995-1-1.
When utilizing the classification system for derivation of plywood characteristic values, this document
can only be applied with reference to EN 636.
This document includes the characteristic values of the mechanical properties for plywood complying
with EN 636 in bending, tension, compression, panel shear and planar shear. EN 636 classifies bending
properties into two sets of classes, one for stiffness and another for strength. Stiffness and strength in
tension and compression are related to the same properties in bending.
For shear properties, fixed values determined by correlation to density are provided.
Where optimized values are needed, the characteristic values are determined directly by testing in
accordance with EN 789 and EN 1058 or by combination of testing according to the latter two standards
and calculation according to EN 14272.
This document applies to panels complying with the three following conditions:
— 5 layers or more and 6 mm overall thickness and more;
— the ratio of the cumulative thickness of veneers in alternate directions does not exceed 2,5;
3 3
— wood species with a mean density greater than 350 kg/m and not exceeding 750 kg/m .
2 Normative references
The following documents are referred to in the text in such a way that some or all of their content
constitutes requirements 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 323, Wood-based panels — Determination of density
EN 635-2, Plywood — Classification by surface appearance — Part 2: Hardwood
EN 635-3, Plywood — Classification by surface appearance — Part 3: Softwood
EN 1995-1-1:2004 , Eurocode 5: Design of timber structures — Part 1-1: General — Common rules and
rules for buildings
EN 13986:2004+A1:2015, Wood-based panels for use in construction — Characteristics, evaluation of
conformity and marking
As impacted by EN 1995-1-1:2004/A1:2008, EN 1995-1-1:2004/A2:2014 and EN 1995-1-1:2004/AC:2006.
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
ISO and IEC maintain terminology databases for use in standardization at the following addresses:
— ISO Online browsing platform: available at https://www.iso.org/obp
— IEC Electropedia: available at https://www.electropedia.org/
3.1
characteristic value
value of a material property relating to limit state design, for use in the design of timber structures,
elements, assemblies and component
Note 1 to entry: As defined in EN 1995-1-1, this value corresponds to a specified percentile of the assumed
distribution of the property under consideration.
Note 2 to entry: For plywood determined as stipulated in this document.
3.2
service class 1
conditions of exposure resulting in moisture content in the materials corresponding to a temperature of
20 °C and the relative humidity of the surrounding air exceeding 65 % for only a few weeks per year
Note 1 to entry: In these conditions the moisture content of coniferous plywood can be expected not to exceed
12 %.
[SOURCE: EN 1995-1-1:2004, 2.3.1.3, modified – Moisture content for plywood has been added in Note 1
to entry.]
3.3
service class 2
conditions of exposure resulting in moisture content in the materials corresponding to a temperature of
20 °C and the relative humidity of the surrounding air exceeding 85 % for only a few weeks per year
Note 1 to entry: In these conditions the moisture content of coniferous plywood can be expected not to exceed
18 %.
[SOURCE: EN 1995-1-1:2004, 2.3.1.3, modified – Moisture content for plywood has been added in Note 1
to entry.]
3.4
service class 3
conditions of exposure resulting in higher moisture content in the materials than in service class 2
Note 1 to entry: In these conditions the moisture content of coniferous plywood can be expected to exceed 18 %.
[SOURCE: EN 1995-1-1:2004, 2.3.1.3, modified – Moisture content for plywood has been added in Note 1
to entry.]
3.5
load duration class
class characterized by the effect of a constant load acting for a certain period of time in the life of the
structure
Note 1 to entry: For a variable action, the appropriate class is determined on the basis of an estimate of the
interaction between the typical variation of the load with time and the rheological properties of the materials.
Note 2 to entry: For strength and stiffness calculations, actions are assigned to one of the load-duration classes
given in Table 1, derived from EN 1995-1-1.
Table 1 — Load duration classes
Order of accumulated
Load duration class duration of characteristic Examples of loading
load
Permanent More than 10 years Self weight
Long-term 6 months to 10 years Storage
Medium-term 1 week to 6 months Imposed load
a
Short-term Less than 1 week
Snow and wind
Instantaneous — Accidental load
a
In areas which have a heavy snow load for a prolonged period of time, part of the load should be regarded as
medium-term.
3.6
lay-up
thickness and arrangement of the plies
3.7
composition
factors compounding the lay-up plus the combination of wood species
4 Symbols
4.1 Main symbols
E 2
Modulus of elasticity (defined as stiffness in EN 1995-1-1:2004),
...