SIST EN 1912:2024

SLOVENSKI STANDARD
oSIST prEN 1912:2023
01-januar-2023
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: prEN 1912
ICS:
79.040 Les, hlodovina in žagan les Wood, sawlogs and sawn
timber
oSIST prEN 1912:2023 en,fr,de
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

oSIST prEN 1912:2023
oSIST prEN 1912:2023
DRAFT
EUROPEAN STANDARD
prEN 1912
NORME EUROPÉENNE
EUROPÄISCHE NORM
November 2022
ICS 79.040 Will supersede 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 draft European Standard is submitted to CEN members for enquiry. It has been drawn up by the Technical Committee
CEN/TC 124.
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
© 2022 CEN All rights of exploitation in any form and by any means reserved Ref. No. prEN 1912:2022 E
worldwide for CEN national Members.

oSIST prEN 1912:2023
prEN 1912:2022 (E)
Contents Page
European foreword . 3
1 Scope . 4
2 Normative references . 4
3 Terms and definitions . 4
4 Symbols and abbreviations . 5
5 Requirements . 5
6 Assignments to strength classes . 5
Annex A (informative) Grading standards . 38
Bibliography . 41

oSIST prEN 1912:2023
prEN 1912:2022 (E)
European foreword
This document (prEN 1912:2022) has been prepared by Technical Committee CEN/TC 124 “Timber
structures”, the secretariat of which is held by AFNOR.
This document is currently submitted to the CEN Enquiry.
This document will supersede EN 1912:2012.
oSIST prEN 1912:2023
prEN 1912:2022 (E)
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.
The assignments 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.
This document contains a list of assignments but is not intended to be exhaustive.
NOTE 1 Timber graded by machine to EN 14081 is graded directly to the strength classes and marked
accordingly. Machine grading is therefore not referenced in this document.
NOTE 2 For combinations of species and visual grades which meet the requirements of EN 14081 but are not
listed in this document, the assignment to strength classes is made according to EN 384.
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 14081 (all parts), Timber structures — Strength graded structural timber with rectangular cross section
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, Panamá
3.2
Central Europe
Austria, Belgium, Czech Republic, France (Alsace region), Germany, Hungary, Italy (Northern part),
Liechtenstein, Luxembourg, Netherlands, Poland, Slovak Republic, 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
oSIST prEN 1912:2023
prEN 1912:2022 (E)
3.5
Northern Europe
Denmark, Estonia, Finland, Iceland, Latvia, Lithuania, Norway, Sweden
3.6
South East Asia
Brunei, Cambodia, Indonesia, Laos, Malaysia, Myanmar, Singapore, Thailand, Timor-Leste, Vietnam
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
3.9
tropical Africa
Angola, Benin, Burundi, Cameroon, Central African Republic, Chad, Congo (Democratic Republic), Congo
Republic (Congo-Brazzaville), Equatorial Guinea, Ethiopia, Gabon, Ghana, Guinea, Guinea-Bissau, Ivory
Coast, 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, Ivory Coast, Liberia, Nigeria, Sierra Leone, Togo
3.11
west and central Africa
Benin, Cameroon, Central African Republic, Chad, Congo (Democratic Republic), Congo Republic (Congo-
Brazzaville), Equatorial Guinea, Gabon, Ghana, Guinea, Guinea-Bissau, Ivory Coast, 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 (all parts).
6 Assignments to strength classes
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.
Table 4 and Table 5 identify the botanical species for the commercial names listed in Tables 1, 2 and 3.
The grading of species combinations, either by common name or botanical name, is valid for a batch of
timber even if only one of the species is present in the graded batch.
oSIST prEN 1912:2023
prEN 1912:2022 (E)
The assignments to strength classes given in this document are based on approved grading reports
(AGRs) accepted by CEN TC 124, other historical testing reports, or historical use. 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.
Table 1 — Assignment of grades of species to bending (C) strength classes
Basis of
Strength
Species Botanical
Grading standard Grade Source assignment Comments
group species
Class
a
C35 ÖNORM DIN 4074- S13 Douglas fir Pseudotsuga Germany & TC124-
1:2012 menziesii Austria 2011
C35 ÖNORM DIN 4074- S13K Douglas fir Pseudotsuga Germany & TC124-
1:2012 menziesii Austria 2011
C35 DIN 4074-1:2012 S13 Douglas fir Pseudotsuga Germany & TC124-
menziesii Austria 2011
C35 DIN 4074-1:2012 S13K Douglas fir Pseudotsuga Germany & TC124-
menziesii Austria 2011
C35 UNE 56546:2022 MEF Shining gum Eucalyptus Spain TC124-
nitens 2022
C35 TS 1265-2012 Class 1 Anatolian Pinus nigra Turkey TC124-
black pine subsp. 2021
pallasiana
C30 ÖNORM DIN 4074- S13 Larch Larix decidua CNE Old
1:2012 (European) Europe
C30 ÖNORM DIN 4074- S13 Scots pine Pinus sylvestris CNE Old
1:2012 (European Europe
redwood)
C30 ÖNORM DIN 4074- S13 Spruce & fir Abies alba , CNE Old, 2020
1:2012 whitewood Picea abies Europe for Central
Europe
C30 ÖNORM DIN 4074- S13K Larch Larix decidua CNE Old
1:2012 (European) Europe
C30 ÖNORM DIN 4074- S13K Scots pine Pinus sylvestris CNE Old
1:2012 (European Europe
redwood)
C30 ÖNORM DIN 4074- S13K Spruce & fir Abies alba , CNE Old, 2020
1:2012 whitewood Picea abies Europe for Central
Europe
C30 ČSN 73 2824-1:2004 and S13 Larch Larix decidua CNE Old
CSN 73 2824/Z1:2009 (European) Europe
C30 ČSN 73 2824-1:2004 and S13 Scots pine Pinus sylvestris CNE Old
CSN 73 2824/Z1:2009 (European Europe
redwood)
ČSN 73 2824-1:2004 and Spruce & fir Abies alba , CNE
C30 S13 Old
CSN 73 2824/Z1:2009 whitewood Picea abies Europe
C30 ČSN 73 2824-1:2004 and S13K Larch Larix decidua CNE Old
CSN 73 2824/Z1:2009 (European) Europe
oSIST prEN 1912:2023
prEN 1912:2022 (E)
Basis of
Strength
Species Botanical
Grading standard Grade assignment Comments
Source
group species
Class
a
C30 ČSN 73 2824-1:2004 and S13K Scots pine Pinus sylvestris CNE Old
CSN 73 2824/Z1:2009 (European Europe
redwood)
C30 ČSN 73 2824-1:2004 and S13K Spruce & fir Abies alba , CNE Old
CSN 73 2824/Z1:2009 whitewood Picea abies Europe
C30 NF B 52 001-1:2018 ST-I French pine Pinus nigra France TC124-
(not subsp. laricio, 2022
including Pinus nigra
maritime) subsp. nigra,
Pinus sylvestris
C30 NF B 52 001-1:2018 ST-I Spruce & fir Abies alba , France Before 2010
whitewood Picea abies
C30 DIN 4074-1:2012 S13 Larch Larix decidua CNE Old
(European) Europe
C30 DIN 4074-1:2012 S13 Scots pine Pinus sylvestris CNE 1994
(European Europe
redwood)
C30 DIN 4074-1:2012 S13 Spruce & fir Abies alba , CNE Old, 2020
whitewood Picea abies Europe for Central
Europe
C30 DIN 4074-1:2012 S13K Larch Larix decidua CNE Old
(European) Europe
C30 DIN 4074-1:2012 S13K Scots pine Pinus sylvestris CNE 1994
(European Europe
redwood)
C30 DIN 4074-1:2012 S13K Spruce & fir Abies alba , CNE Old, 2020
whitewood Picea abies Europe for Central
Europe
C30 UNI 11035-2:2022 LS Sweet Castanea sativa Italy TC124-
chestnut 2021
C30 UNI 11035-1:2022 S1 Douglas fir Pseudotsuga Italy TC124- Maximum
menziesii 2010 width and
thickness
100 mm
C30 UNI 11035-1:2022 S1 Spruce & fir Abies alba , Italy TC124-
whitewood Picea abies 2021
C30 NEN T3 Larch Larix decidua Northern Old
5499:2007/A1:2011 (European) Europe
C30 NEN T3 Scots pine Pinus sylvestris Northern Old
5499:2007/A1:2011 (European Europe
redwood)
C30 NEN T3 Spruce & fir Abies alba , Northern Old
5499:2007/A1:2011 whitewood Picea abies Europe
C30 INSTA 142:2009 T3 Larch Larix decidua Northern Old
(European) Europe
oSIST prEN 1912:2023
prEN 1912:2022 (E)
Basis of
Strength
Species Botanical
Grading standard Grade assignment Comments
Source
group species
Class
a
C30 INSTA 142:2009 T3 Scots pine Pinus sylvestris Northern Old
(European Europe
redwood)
C30 INSTA 142:2009 T3 Spruce & fir Abies alba , Northern Old
whitewood Picea abies Europe
C30 STN 49 1531:2001 S0 Norway Picea abies Slovak TC124-
spruce Republic 2007
C30 UNE 56544:2022 ME1 Salzmann Pinus nigra Spain TC124-
pine subsp. 2003
Salzmannii
C27 NF B 52 001-1:2018 ST-I Larch Larix decidua France Before 2010
(European)
C27 DIN 4074-5:2008 LS13 Poplar Populus nigra Germany TC124-
(nigra) 2008
C27 DIN 4074-5:2008 LS13K Poplar Populus nigra Germany TC124-
(nigra) 2008
Scots pine TC124-
C27 UNE 56544:2022 ME1 Pinus sylvestris Spain
(European 2003
redwood)
C27 TS 1265-2012 Class 1 Caucasian Abies Turkey TC124-
and taurus fir nordmanniana , 2021
Abies cilicica ,
Abies
bornmuelleriana
, Abies equi-
trojani
C24 ÖNORM DIN 4074- S10 Douglas fir Pseudotsuga Germany & TC124-
1:2012 menziesii Austria
C24 ÖNORM DIN 4074- S10 Larch Larix decidua CNE Old
1:20
...