EN 1912:2024
(Main)Structural Timber - Strength classes - Assignment of visual grades and species
Structural Timber - Strength classes - Assignment of visual grades and species
This document lists visual strength grades, species and sources of timber, and specifies the strength classes to which they are assigned. The assignments listed are for strength classes documented in EN 338.
Structural timber that has previously been graded cannot be re-graded to the same or different grades unless the method of determining characteristic values has made allowances for changes to the timber population caused by the previous grading.
NOTE 1 Consequently, the assignments stated in this document apply to timber that has not been previously strength graded in a way that introduces a bias on the population of timber to be graded, as compared to ungraded material.
Species/grades or species combination/grades are assigned to strength classes in accordance with EN 14081-1 and supporting standards, such as EN 384.
This document contains a list of assignments but is not intended to be exhaustive.
NOTE 2 Timber graded by machine to EN 14081-1 is graded directly to the strength classes and marked accordingly. Machine grading is therefore not referenced in this document.
Bauholz für tragende Zwecke - Festigkeitsklassen - Zuordnung von visuellen Sortierklassen und Holzarten
Dieses Dokument gibt visuelle Festigkeitsklassen, Holzarten und deren Herkunft an und legt die Festigkeitsklassen fest, denen sie zugeordnet sind. Die aufgeführten Zuordnungen beziehen sich auf die in EN 338 dokumentierten Festigkeitsklassen.
Bereits sortiertes Bauholz für tragende Zwecke darf nicht neu in dieselbe oder eine andere Sortierklasse sortiert werden, es sei denn, im Verfahren für die Bestimmung charakteristischer Werte waren durch die vorherige Sortierung verursachte Änderungen der Holzgrundgesamtheit vorgesehen.
ANMERKUNG 1 Somit gelten die in diesem Dokument genannten Zuordnungen für Holz, das zuvor nicht in einer Weise nach Festigkeit sortiert wurde, die zu einer Verzerrung der zu sortierenden Holzpopulation im Vergleich zu nicht sortiertem Material führt.
Holzarten/Sortierklassen oder Holzartenkombinationen/Sortierklassen werden Festigkeitsklassen nach EN 14081 1 und unterstützenden Normen wie z. B. EN 384 zugeordnet.
Dieses Dokument enthält eine Liste von Zuordnungen, erhebt jedoch keinen Anspruch auf Vollständigkeit.
ANMERKUNG 2 Maschinell nach EN 14081 1 sortiertes Holz wird direkt nach den Festigkeitsklassen sortiert und entsprechend gekennzeichnet. Daher wird in diesem Dokument nicht auf die maschinelle Sortierung Bezug genommen.
Bois de structure - Classes de résistance - Affectation des classes visuelles et des essences
Le présent document répertorie les classes visuelles de résistance, les essences et les origines d'approvisionnement de bois, et spécifie les classes de résistance auxquelles elles se rapportent. Les affectations répertoriées concernent les classes de résistance présentées dans l'EN 338.
Un bois de structure qui a déjà été classé ne peut être reclassé dans la même catégorie ou dans une catégorie différente, à moins que la méthode de détermination des valeurs caractéristiques n'ait tenu compte des variations de la population de bois générées par le classement précédent.
NOTE 1 En conséquence, les affectations stipulées dans le présent document s'appliquent au bois pour lequel aucune classe de résistance n'a été auparavant définie selon une approche qui introduirait un biais dans la population de bois à classer, comparativement à un matériau non classé.
Les essences/classes ou combinaisons d'essences/classes sont affectées à des classes de résistance conformément à l'EN 14081-1 et à ses normes connexes, telles que l'EN 384.
Le présent document contient une liste d'affectations, mais ne prétend pas être exhaustif.
NOTE 2 Les bois classés par machine selon l'EN 14081-1 peuvent être directement affectés à des classes de résistance et marqués en conséquence. Le classement par machine n'est donc pas référencé dans le présent document.
Konstrukcijski les - Trdnostni razredi - Določitev trdnostnih razredov na podlagi vizualnega razvrščanja in vrste lesa
General Information
Relations
Standards Content (Sample)
SLOVENSKI STANDARD
01-september-2024
Nadomešča:
SIST EN 1912:2012
SIST EN 1912:2012/AC:2013
Konstrukcijski les - Trdnostni razredi - Določitev trdnostnih razredov na podlagi
vizualnega razvrščanja in vrste lesa
Structural Timber - Strength classes - Assignment of visual grades and species
Bauholz für tragende Zwecke - Festigkeitsklassen - Zuordnung von visuellen
Sortierklassen und Holzarten
Bois de structure - Classes de résistance - Affectation des classes visuelles et des
essences
Ta slovenski standard je istoveten z: EN 1912:2024
ICS:
79.040 Les, hlodovina in žagan les Wood, sawlogs and sawn
timber
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
EN 1912
EUROPEAN STANDARD
NORME EUROPÉENNE
May 2024
EUROPÄISCHE NORM
ICS 79.040 Supersedes EN 1912:2012
English Version
Structural Timber - Strength classes - Assignment of visual
grades and species
Bois de structure - Classes de résistance - Affectation Bauholz für tragende Zwecke - Festigkeitsklassen -
des classes visuelles et des essences Zuordnung von visuellen Sortierklassen und Holzarten
This European Standard was approved by CEN on 8 April 2024.
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-CENELEC 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-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.
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. EN 1912:2024 E
worldwide for CEN national Members.
Contents Page
European foreword . 3
1 Scope . 4
2 Normative references . 4
3 Terms and definitions . 4
4 Symbols and abbreviations . 6
5 Requirements . 6
6 Assignments to strength classes . 6
Annex A (informative) Grading standards . 37
Bibliography . 40
European foreword
This document (EN 1912:2024) has been prepared by Technical Committee CEN/TC 124 “Timber
structures”, the secretariat of which is held by AFNOR.
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 November 2024, and conflicting national standards shall
be withdrawn at the latest by November 2024.
Attention is drawn to the possibility that some of the elements of this document may be the subject of
patent rights. CEN shall not be held responsible for identifying any or all such patent rights.
This document supersedes EN 1912:2012.
Any feedback and questions on this document should be directed to the users’ national standards body.
A complete listing of these bodies can be found on the CEN website.
According to the CEN-CENELEC Internal Regulations, the national standards organisations of the
following countries are bound to implement this European Standard: 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 the United
Kingdom
1 Scope
This document lists visual strength grades, species and sources of timber, and specifies the strength
classes to which they are assigned. The assignments listed are for strength classes documented in EN 338.
Structural timber that has previously been graded cannot be re-graded to the same or different grades
unless the method of determining characteristic values has made allowances for changes to the timber
population caused by the previous grading.
NOTE 1 Consequently, the assignments stated in this document apply to timber that has not been previously
strength graded in a way that introduces a bias on the population of timber to be graded, as compared to ungraded
material.
Species/grades or species combination/grades are assigned to strength classes in accordance with
EN 14081-1 and supporting standards, such as EN 384.
This document contains a list of assignments but is not intended to be exhaustive.
NOTE 2 Timber graded by machine to EN 14081-1 is graded directly to the strength classes and marked
accordingly. Machine grading is therefore not referenced in this document.
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 384, Structural timber — Determination of characteristic values of mechanical properties and density
EN 14081-1, Timber structures — Strength graded structural timber with rectangular cross section — Part
1: General requirements
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
ISO and IEC maintain terminological databases for use in standardization at the following addresses:
— IEC Electropedia: available at https://www.electropedia.org/
— ISO Online browsing platform: available at https://www.iso.org/obp
3.1
Caribbean
Bahamas, Belize, Colombia (Northern part), Costa Rica, Cuba, El Salvador, Guatemala, Honduras, Mexico
(South Eastern part), Nicaragua, Panama
3.2
Central Europe
Austria, Belgium, Czech Republic, France (Alsace region), Germany, Hungary, Italy (Northern part),
Liechtenstein, Luxembourg, Netherlands, Poland, Slovakia, Slovenia, Switzerland
3.3
Eastern Europe
Azerbaijan, Belarus, Georgia, Moldova, Romania, Russia (European part: Northwest Russia, Volga, South
Russia, North Caucasus), Ukraine
3.4
Nordic countries
Denmark, Finland, Iceland, Norway and Sweden
3.5
Northern Europe
Denmark, Estonia, Finland, Iceland, Latvia, Lithuania, Norway, Sweden
3.6
South East Asia
Brunei Darussalam, Cambodia, Indonesia, Laos, Malaysia, Myanmar, Singapore, Thailand, Timor-Leste,
Viet Nam
3.7
timber source
identifiable geographical origin of a species or species combination from which timber is, or is intended
to be, strength graded
3.8
timber species
individual species or combination of species, linked to botanical identification
3.9
Tropical Africa
Angola, Benin, Burundi, Cameroon, Central African Republic, Chad, the Democratic Republic of the Congo,
The Congo, Equatorial Guinea, Ethiopia, Gabon, Ghana, Guinea, Guinea-Bissau, Côte d’Ivoire, Kenya,
Liberia, Malawi, Mozambique, Nigeria, Rwanda, Sierra Leone, South Sudan, Sudan, Tanzania, Togo,
Uganda, Zambia, Zimbabwe
3.10
West Africa
Benin, Ghana, Guinea, Guinea-Bissau, Côte d’Ivoire, Liberia, Nigeria, Sierra Leone, Togo
3.11
West and Central Africa
Benin, Cameroon, Central African Republic, Chad, the Democratic Republic of the Congo, The Congo,
Equatorial Guinea, Gabon, Ghana, Guinea, Guinea-Bissau, Côte d’Ivoire, Liberia, Niger, Nigeria, Sierra
Leone, Togo, Uganda
4 Symbols and abbreviations
AGR Approved Grading Report
CNE Europe Central Europe, Northern Europe and Eastern Europe
5 Requirements
Application of the grading assignments listed in in Tables 1, 2 and 3 shall be carried out in accordance
with the requirements of EN 14081-1 and supporting standards, such as EN 384.
6 Assignments to strength classes
The timber grades, species and sources listed are considered to meet the requirements of the strength
classes of EN 338 to which they are assigned in Tables 1, 2 and 3. Softwoods are assigned to C or T classes.
Hardwoods are usually assigned to D classes but may be assigned to C or T classes if their strength profile
is similar to that of softwoods. Table 4 and Table 5 identify the botanical names and four digit code
according to EN 13556 for the commercial names of timber species listed in Tables 1, 2 and 3. The grading
of species combinations, either by commercial names or botanical names, is valid for a batch of timber
even if only one of the species is present in the graded batch.
The assignments to strength classes given in this document are based on approved grading reports
(AGRs) accepted by CEN/TC 124, other testing reports, or proven practice over time. Further assignments
in future versions of this standard shall be approved by CEN/TC 124 based on AGRs. A current list of
reports is available through CEN/TC 124 secretariat. Further AGRs may be used as documentation before
the information they contain becomes available in an amendment or revision of EN 1912. In the event of
any discrepancy between an earlier dated AGR and this standard, this standard shall take precedence.
The timber grades, species and sources listed meet the requirements of the strength classes to which they
are assigned in Tables 1, 2 and 3, with reference to the grading standards listed in Annex A and the visual
grading requirements given in EN 14081-1.
Table 1 — Assignment of grades of species to bending (C) strength classes
Timber species
Basis of
Strength
Grading standard Grade Source
assignment
Commercial
Class
Botanical name(s)
a
name(s)
C35 TS 1265:2012 Class Anatolian Pinus nigra subsp. Türkiye TC124–
1 black pine pallasiana 2021
C35 DIN 4074-1:2012 S13, Douglas fir Pseudotsuga Germany TC124–
S13K menziesii and 2011
Austria
C35 ÖNORM DIN 4074-1:2012 S13, Douglas fir Pseudotsuga Germany TC124–
S13K menziesii and 2011
Austria
C35 TS 1265:2012 Class Scots pine Pinus sylvestris Türkiye TC124–
1 (redwood) 2022
TC124–
C35 UNE 56546:2022 MEF Shining gum Eucalyptus nitens Spain
C35 TS 1265:2012 Class Turkish red Pinus brutia Türkiye TC124–
1 pine 2022
Timber species
Basis of
Strength
Grading standard Grade Source assignment
Commercial
Class
Botanical name(s)
a
name(s)
C30 UNI 11035-1:2022 S1 Douglas fir Pseudotsuga Italy TC124–
menziesii 2010
Width and thickness ≤ 100 mm
C30 ČSN 73 2824–1:2015 S13, European Larix decidua CNE Old
S13K larch Europe
C30 DIN 4074-1:2012 S13, European Larix decidua CNE Old
Europe
S13K larch
C30 ÖNORM DIN 4074-1:2012 S13, European Larix decidua CNE Old
Europe
S13K larch
C30 SIA 265/2:2023 S13, European Larix decidua CNE Old
Europe
S13K larch
C30 INSTA 142:2009 T3 European Larix decidua Northern Old
larch Europe
C30 NEN 5499:2007/A1:2011 T3 European Larix decidua Northern Old
larch Europe
French pine Pinus nigra subsp. TC124–
C30 NF B 52–001–1:2018 ST-I France
(not laricio, Pinus nigra 2022
including subsp. nigra, Pinus
maritime) sylvestris
C30 STN 49 1531:2001 S0 Norway Picea abies Slovakia TC124–
spruce 2007
C30 UNE 56544:2022 ME1 Salzmann Pinus nigra subsp. Spain TC124–
pine salzmannii 2003
C30 ČSN 73 2824–1:2015 S13, Scots pine Pinus sylvestris CNE Old
S13K (redwood) Europe
C30 DIN 4074-1:2012 S13, Scots pine Pinus sylvestris CNE 1994
S13K (redwood) Europe
C30 ÖNORM DIN 4074-1:2012 S13, Scots pine Pinus sylvestris CNE 1994
S13K (redwood) Europe
C30 SIA 265/2:2023 S13, Scots pine Pinus sylvestris CNE 1994
S13K (redwood) Europe
C30 INSTA 142:2009 T3 Scots pine Pinus sylvestris Northern Old
(redwood) Europe
C30 NEN 5499:2007/A1:2011 T3 Scots pine Pinus sylvestris Northern Old
(redwood) Europe
C30 ČSN 73 2824–1:2015 S13, Spruce and Picea abies, Abies CNE Old
S13K fir alba Europe
(whitewood)
C30 DIN 4074-1:2012 S13, Spruce and Picea abies, Abies CNE Old, 2020
S13K fir alba Europe for Central
(whitewood) Europe
C30 ÖNORM DIN 4074-1:2012 S13, Spruce and Picea abies, Abies CNE Old, 2020
S13K fir alba Europe for Central
(whitewood) Europe
Timber species
Basis of
Strength
Grading standard Grade Source assignment
Commercial
Class
Botanical name(s)
a
name(s)
C30 SIA 265/2:2023 S13, Spruce and Picea abies, Abies CNE Old, 2020
S13K fir alba Europe for Central
(whitewood) Europe
C30 NF B 52–001–1:2018 ST-I Spruce and Picea abies, A
...
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