EN 1912:2004+A3:2009

SLOVENSKI STANDARD
01-november-2009
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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 - Affection des classes visuelles et des
essences
Ta slovenski standard je istoveten z: EN 1912:2004+A3:2009
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.

EUROPEAN STANDARD
EN 1912:2004+A3
NORME EUROPÉENNE
EUROPÄISCHE NORM
May 2009
ICS 79.040 Supersedes EN 1912:2004+A2:2008
English Version
Structural timber - Strength classes - Assignment of visual
grades and species
Bois de structure - Classes de résistance - Affection des Bauholz für tragende Zwecke - Festigkeitsklassen -
classes visuelles et des essences Zuordnung von visuellen Sortierklassen und Holzarten
This European Standard was approved by CEN on 10 September 2004 and includes Amendment 1 approved by CEN on 28 December
2006, Amendment 2 approved by CEN on 2 February 2008 and Amendment 3 approved by CEN on 21 April 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 Ref. No. EN 1912:2004+A3:2009: E
worldwide for CEN national Members.

Contents
page
Foreword .3
1 Scope .4
2 Normative references .4
3 Terms and definitions .4
4 Symbols and abbreviations .4
5 Requirements .5
6 Assignments to strength classes .5
Annex A (informative)  Grading standards . 13
Bibliography . 15

Foreword
This document (EN 1912:2004+A3:2009) has been prepared by Technical Committee CEN/TC 124 “Timber
structures”, the secretariat of which is held by SFS.
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 2009 and conflicting national standards shall be withdrawn
at the latest by November 2009.
This document includes Amendment 1 approved on 2006-12-28, Amendment 2, approved by CEN on
2008-02-02 and Amendment 3, approved by CEN on 2009-04-21.
This document supersedes %EN 1912:2004+A2:2008&.
The start and finish of text introduced or altered by amendment is indicated in the text by tags ! ",
#$ and % &.
This revised version contains assignments of additional grades and species.
According to the CEN/CENELEC Internal Regulations, the national standards organizations of the following
countries are bound to implement this European Standard: 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.

1 Scope
This document lists visual strength grades, species and sources of timber, and specifies the strength classes
from EN 338, to which they are assigned.
NOTE For the grades, species and sources included, there is long experience of use and/or satisfactory test data.
The sources listed are therefore largely determined by existing commercial practice.
2 Normative references
The following referenced documents are indispensable for the application 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 (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.
3.1
timber source
geographical area of growth of the trees from which the timber is sawn
3.2
timber species
individual species or combination of species
3.3
Nordic countries
Denmark, Finland, Iceland, Norway and Sweden
4 Symbols and abbreviations
CNE Europe  Central, Northern and Eastern Europe
NNE Europe  Northern and North Eastern Europe
NC Europe  Northern and Central Europe
5 Requirements
5.1 The grades referred to in Tables 1 and 2 shall be in accordance with a grading standard meeting the
requirements of #EN 14081$.
5.2 Timber of a grade, species and source may be assigned to a strength class and listed in this document
provided there is long experience of use and/or test data in accordance with EN 384.
NOTE 1 Where the required information becomes available for a grade, species and source not included in this
document, preliminary assignment to a strength class, pending revision of this document, may be obtained from
CEN/TC 124.
NOTE 2 The assignments of grades, species and sources to strength classes given in this document should be
reassessed when this document is reviewed, or sooner if there is reason to suspect that the mechanical properties and/or
density of the timber have changed, or the basis for the existing assessment no longer represents the current situation, e.g.
if there has been a change in the source.
6 Assignments to strength classes
Timber grades, species and sources listed, meet the requirements of the strength classes to which they are
assigned in Table 1 and Table 2.
Table 3 and Table 4 identify the botanical species for the commercial names listed in Table 1 and Table 2.
NOTE 1 Timber graded by machine to #EN 14081$ may be graded directly to the strength classes and marked
accordingly, and 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 standard, the assignment to strength classes can be made according to EN 338 using characteristic values
determined in accordance with EN 384.
Table 1 — Assignment of grades of conifer species and poplar to strength classes
%
Strength Grading rule Grade Species commercial Source Botanical Comments
Class publishing (see name (see Note 2) identification
country Note 4) (see Table 3)
(see Note 1 at
end of the
table)
C35 Germany S13 Douglas Fir Germany 54
C30 France ST-I Spruce & Fir France 1, 22

Germany & S13 Spruce CNE Europe 22
Austria S13 Pine CNE Europe 47
S13 Fir CNE Europe 1
S13 Larch CNE Europe 15
Nordic T3 Pine (Redwood) NNE Europe 47
countries T3 Spruce (Whitewood) NNE Europe 22
T3 Fir NNE Europe 1
T3 Larch NNE Europe 15
USA J&P Sel Southern pine USA 35, 36, 43, 48
SLF Sel Southern pine USA 35, 36, 43, 48

Spain ME1 Laricio pine Spain 39

Slovak S0 Spruce Slovak Republic 22
Republic
C 27 France ST-I Larch France 15

Germany LS13 Poplar Germany 51

Spain ME1 Scots pine Spain 47
C24 France ST-II Spruce & Fir France 1, 22
ST-II Douglas Fir France 54
ST-II Pines France 39, 44, 47
ST-II Poplar (see Note 3) France 50
ST-II Larch France 15
Germany S10 Douglas Fir Germany 54

Germany & S10 Spruce CNE Europe 22

Austria S10 Pine CNE Europe 47
S10 Fir CNE Europe 1
S10 Larch CNE Europe 15
Nordic T2 Pine (Redwood) NNE Europe 47
countries T2 Spruce (Whitewood) NNE Europe 22
T2 Fir NNE Europe 1
T2 Larch NNE Europe 15
T2 & Sitka spruce Denmark and 28
better Norway
Spain ME1 Radiata pine Spain 49
ME1 Maritime pine Spain 44
C24 USA & J&P Sel Douglas fir-Larch USA & Canada 18, 54
Canada J&P Sel Hem-fir USA & Canada 2, 4, 5, 7, 8, 62
J&P Sel S-P-F USA & Canada 3, 6, 23, 25, 26,
SLF Sel Douglas fir-Larch USA & Canada 27, 32, 34, 45
SLF Sel Hem-fir USA & Canada 18, 54

SLF Sel S-P-F USA & Canada 2, 4, 5, 7, 8, 62
3, 6, 23, 25, 26,
27, 32, 34, 45
UK SS Paraná pine Brazil 12
SS Redwood CNE Europe 47
SS Whitewood CNE Europe 1, 22
SS Douglas fir-Larch USA & Canada 18, 54
SS Hem-fir USA & Canada 2, 4, 5, 7, 8, 62
SS S-P-F USA & Canada 3, 6, 23, 25, 26,
27, 32, 34, 45
SS Southern pine USA 35, 36, 43, 48
SS Caribbean pitch pine Caribbean 33, 42
SS Larch UK 15, 16, 17
Slovak SI Spruce Slovak Republic 22
Republic
C22 Germany LS10 & Poplar Germany 51
better
UK SS British pine UK 39, 47
USA J&P No.1 Southern pine USA 35, 36, 43, 48
J&P No.2 Southern pine USA 35, 36, 43, 48
SLF No.1 Southern pine USA 35, 36, 43, 48
SLF No.2 Southern pine USA 35, 36, 43, 48
C20 Canada No.1 & S-P-F Canada 3, 6, 23, 25, 26,
better  27, 32, 34, 45
No.1 & Douglas Fir – Larch Canada 18,54
better
No.1 & Hem-fir Canada 2, 4, 5, 7, 8, 62
better
C18 Canada J&P Sel Sitka spruce Canada 28
J&P Sel Western red cedar Canada 58

SLF Sel Sitka spruce Canada 28
SLF Sel Western red cedar Canada 58

France ST-III Spruce & fir France 1, 22
ST-III Douglas fir France 54
ST-III Pines France 39, 44, 47

ST-III Poplar (see Note 3) France 50

ST-III Larch France 15
Germany & S7 Norway spruce CNE Europe 22
Austria S7 Scots pine CNE Europe 47

Ireland SS Norway spruce Ireland 22

SS Sitka spruce Ireland 28
Nordic T1 Pine (Redwood) NNE Europe 47
countries T1 Spruce (Whitewood) NNE Europe 22

T1 Fir NNE Europe 1
T1 Larch NNE Europe 15
T1 Sitka spruce Denmark & 28
Norway
C18 Portugal E Maritime pine Portugal 44
Radiata pine
Spain ME2 Spain 49
Maritime pine
ME2 Spain 44
Laricio pine
ME2 Spain 39
Scots pine
ME2 Spain 47
Western red cedar
UK SS Canada 58
Sitka spruce
SS Canada 28
Western white
SS USA 3, 6, 23, 34, 37,
woods
38, 45, 63
Douglas fir
SS UK 54
British spruce
SS UK 22, 28
Caribbean pitch
GS Caribbean 33, 42
pine
GS
Southern pine
USA 35, 36, 43, 48
Western white
USA J&P Sel USA 3, 6, 23, 34, 37,
woods
38, 45, 63
Western white
SLF Sel USA 3, 6, 23, 34, 37,
woods
38, 45, 63
Southern pine
LF Const USA 35, 36, 43, 48
C16 Germany S7 Douglas Fir Germany 54

Germany & S7 Fir CNE Europe 1
Austria S7 Larch CNE Europe 15

UK GS Paraná pine Brazil 12
GS Redwood CNE Europe 47
GS Whitewood CNE Europe 1, 22
GS Douglas fir-Larch USA & Canada 18, 54
GS Hem-fir USA & Canada 2, 4, 5, 7, 8, 62
GS S-P-F USA & Canada 3, 6, 23, 25, 26,
27, 32, 34, 45
GS Larch UK 15, 16, 17
USA &
J&P No.1 Douglas fir-Larch USA & Canada 18, 54
Canada
J&P No.2 Douglas fir-Larch USA & Canada 18, 54

J&P No.1 Hem-fir USA & Canada 2, 4, 5, 7, 8, 62

J&P No.2 Hem-fir USA & Canada 2, 4, 5, 7, 8, 62

J&P No.1 S-P-F USA & Canada 3, 6, 23, 25, 26,

27, 32, 34, 45
J&P No.2 S-P-F USA & Canada 3, 6, 23, 25, 26,

27, 32, 34, 45
USA &
SLF No.1 Douglas fir-Larch USA & Canada 18, 54
Canada
SLF No.2 Douglas fir-Larch USA & Canada 18, 54

SLF No.1 Hem-fir USA & Canada 2, 4, 5, 7, 8, 62

SLF No.2 Hem-fir USA & Canada 2, 4, 5, 7, 8, 62

SLF No.1 S-P-F USA & Canada 3, 6, 23, 25, 26,

27, 32, 34, 45
SLF No.2 S-P-F USA & Canada 3, 6, 23, 25, 26,

27, 32, 34, 45
USA J&P No.3 Southern pine USA 35, 36, 43, 48

SLF No.3 Southern pine USA 35, 36, 43, 48
Stud Southern pine USA 35, 36, 43, 48

C16 Slovak SII Spruce Slovak Republic 22
Republic
SIST EN 1912:2004+A3:
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