SIST EN 1912:2004/kprA3:2009

Structural timber - Strength classes - Assignment of visual grades and species

To add new visual strength grades/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

Konstrukcijski les - Trdnostni razredi - Določitev trdnostnih razredov na podlagi vizualnega razvrščanja in vrste lesa

General Information

• Status: Not Published
• Public Enquiry End Date: 14-Mar-2009
• ICS: 79.040 - Wood, sawlogs and sawn timber
• Technical Committee: KON.005 - Timber structures
• Current Stage: 98 - Abandoned project (Adopted Project)
• Start Date: 28-Oct-2013
• Due Date: 02-Nov-2013
• Completion Date: 28-Oct-2013
• Ref Project: EN 1912:2004/prA3 - Structural timber - Strength classes - Assignment of visual grades and species

Relations

• Consolidated By: SIST EN 1912:2004+A3:2009 - Structural timber - Strength classes - Assignment of visual grades and species
• Effective Date: 18-Jan-2023

Overview

EN 1912:2004/prA3 (CEN) is a draft amendment to the European standard EN 1912:2004 (Structural timber - Strength classes - Assignment of visual grades and species). Submitted by Technical Committee CEN/TC 124 in November 2008, the prA3 amendment updates the assignment of visual grading rules and commercial species to Euro strength classes for structural timber. The amendment proposes specific changes to the standard’s lookup tables (Tables 1–4 and Annex A.1) and clarifies species identification and grading-rule references.

Key topics and requirements

• Scope: Assignment of visual strength grades and species to Euro strength classes (conifers and hardwoods).
• Table updates (summary of prA3 changes):
  • Table 1 (conifers and poplar): deletions and reassignments (e.g., Netherlands grade C removed from C16; some S7 grades moved from C16 to C18); additions such as LS13 (German poplar) → C27 and LS10 & better (German poplar) → C22.
  • Table 2 (hardwoods): additions of TH1 American white oak → D50, TH1 American red oak → D40, TH1 American white ash → D35, and LS10 & better (German ash) → D40.
  • Table 3: Populus nigra added to species identification.
  • Table 4: Fraxinus americana, Fraxinus excelsior, and Quercus alba added to hardwood identification.
  • Table A.1 (Annex A): editorial improvements and explicit references to national grading standards that define the visual grades used in the assignments.
• Species identification: Botanical identification numbers and the note that only specific poplar clones apply (e.g., Populus x euramericana cv “Robusta”, “Dorskamp”, “I 214”, “I 4551”).
• Grading rule linkage: Assignments reference national grading rules and standards (e.g., DIN, NF, BS, NGRDL, INSTA) listed in Annex A.1.

Practical applications

• Selection and specification of structural timber for buildings and civil engineering works where compliance with Euro strength classes is required.
• Procurement and quality control by timber merchants and importers to ensure that visual grades from different countries map correctly to EN strength classes.
• Visual grading and certification bodies use the table assignments to justify grade-to-class conversions and to align national grading rules with EN 1912.
• Structural engineers, designers and building inspectors reference these assignments when checking material conformity to design assumptions (strength class selection, design values).
• Useful for manufacturers of engineered wood products and for harmonising cross‑border timber trade within Europe.

Related standards and references

• EN 1912:2004 (base standard) and EN 1912:2004+A2:2008 (prior amendment)
• National grading standards listed in Annex A.1 (e.g., DIN 4074, NF B 52-001, BS 5756, NGRDL)
• Eurocode design standards that use timber strength classes for structural calculations

Keywords: structural timber, strength classes, visual grades, species assignment, EN 1912:2004, timber grading, poplar, oak, ash, CEN.

Standards Content (Sample)

SLOVENSKI STANDARD
01-marec-2009
.RQVWUXNFLMVNLOHV7UGQRVWQLUD]UHGL'RORþLWHYWUGQRVWQLKUD]UHGRYQDSRGODJL
YL]XDOQHJDUD]YUãþDQMDLQYUVWHOHVD
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 1912:2004/prA3
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
FINAL DRAFT
EN 1912:2004+A2:2008
NORME EUROPÉENNE
EUROPÄISCHE NORM
prA3
November 2008
ICS 79.040
English Version
Structural timber - Strength classes - Assignment of visual
grades and species
Bois de structure - Classes de résistance - Affectation des Bauholz für tragende Zwecke - Festigkeitsklassen -
classes visuelles et des essences Zuordnung von visuellen Sortierklassen und Holzarten
This draft amendment is submitted to CEN members for unique acceptance procedure. It has been drawn up by the Technical Committee
CEN/TC 124.
This draft amendment A3, if approved, will modify the European Standard EN 1912:2004+A2:2008. If this draft becomes an amendment,
CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for inclusion of this
amendment into the relevant national standard without any alteration.
This draft amendment 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 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.
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
Management Centre: rue de Stassart, 36  B-1050 Brussels
© 2008 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN 1912:2004/prA3:2008: E
worldwide for CEN national Members.

Contents Page
Foreword.3
1 Modifications to Table 1.4
2 Modifications to Table 2.4
3 Modifications to Table 3.4
4 Modifications to Table 4.4
5 Modifications to Table A.1 .4

Foreword
This document (EN 1912:2004/prA3:2008) has been prepared by Technical Committee CEN/TC 124 “Timber
structures”, the secretariat of which is held by SFS.
This document is currently submitted to the Unique Acceptance Procedure.

1 Modifications to Table 1
Replace existing Table 1 with the attached Table 1.
Netherlands grade C has been deleted from C16.
Grade S7 of German and Austrian Norway spruce and Scots pine deleted from C16 and added to C18.
Grade LS13 of German Poplar has been added to C27.
Grade LS10 & better of German Poplar has been added to C22.
2 Modifications to Table 2
Replace existing Table 2 with the attached Table 2.
Grade TH1 of American white oak has been added to D50.
Grade TH1 of American red oak has been added to D40.
Grade TH1 of American white ash has been added to D35.
Grade LS10 & better of German Ash has been added to D40.
3 Modifications to Table 3
Replace existing Table 3 with the attached Table 3.
Populus nigra has been added.
4 Modifications to Table 4
Replace existing Table 4 with the attached Table 4.
Fraxinus americana has been added.
Fraxinus excelsior has been added.
Quercus alba has been added.
5 Modifications to Table A.1
Replace existing Table A.1 with the attached Table A.1.
Editorial improvements have been made.

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
...