SIST EN 1912:2004/oprA2:2007

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

To add new visual strength grades/species, second amendment

Bauholz für tragende Zwecke - Festigkeitsklassen - Zuordnung von visuellen Sortierklassen und Holzarten

Bois de structure - Classes de résistance - Affectation des classes visuelles 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: 30-Oct-2007
• ICS: 79.040 - Wood, sawlogs and sawn timber
• Technical Committee: KON - 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/prA2 - Structural timber - Strength classes - Assignment of visual grades and species

Relations

• Consolidated By: SIST EN 1912:2004+A2:2008 - Structural timber - Strength classes - Assignment of visual grades and species
• Effective Date: 18-Jan-2023
• Amends: SIST EN 1912:2005 - Structural timber - Strength classes - Assignment of visual grades and species
• Effective Date: 22-Dec-2008

Overview

EN 1912:2004/prA2 (CEN, draft amendment August 2007) is a technical amendment to the European standard EN 1912:2004 - Structural timber: Strength classes - Assignment of visual grades and species. The amendment updates the official mapping between national visual grading rules, commercial grade names and botanical species to the European strength classes (C‑classes). The document was prepared by CEN/TC 124 and submitted under the Unique Acceptance Procedure. It replaces the original Table 1 to add or reassign visual grades/species (notably moving the Slovak SI spruce grade from C22 to C24) and clarifies source references and notes on applicability.

Key topics and requirements

• Assignment table update: Replacement of Table 1 that links national grading rules and commercial grade names to Euro strength classes (C35, C30, C27, C24, C22, C20, C18, C16, C14, etc.).
• Species and grade mapping: Explicit mapping of conifer species and certain poplars to strength classes, including country-specific grade names (e.g., ST, S, T, J&P, SLF, SS).
• Notable amendment: Movement of the Slovak spruce grade (SI) from C22 to C24, reflecting reassignment of visual grade to a higher strength class.
• Ancillary information: Botanical identification columns, comments and source references for each assignment; notes on geographic abbreviations (Nordic, CNE, NNE, NC) and restrictions (e.g., poplar assignments apply only to certain clones).
• Normative linkage: Grades listed are specified in grading standards referenced in Annex A (grading standards are authoritative for the listed grade definitions).

Practical applications

• Ensures consistent timber grading across European markets by defining how national visual grades correspond to Euro strength classes.
• Supports consistent material selection for load‑bearing timber elements, procurement specifications, quality control and cross‑border trade of structural timber.
• Provides a reference for updating national standards, technical datasheets and product declarations when grade-to-strength relationships change.

Who uses this standard

• Timber graders and inspection bodies implementing visual grading rules.
• Timber producers, sawmills and suppliers aligning commercial grades with Euro strength classes.
• Structural engineers, specifiers and architects referencing material strength classes for design and verification.
• National standards bodies and certification schemes responsible for harmonizing grade assignments.

Related standards and references

• EN 1912:2004 (base standard) and the grading standards listed in Annex A - these provide the detailed grade definitions that EN 1912 maps to strength classes.
• Prepared by CEN/TC 124 (Timber structures); document distributed in English, French and German for national adoption.

Keywords: EN 1912, structural timber, strength classes, visual grades, species assignment, timber grading, CEN, timber standard.

Standards Content (Sample)

SLOVENSKI STANDARD
01-oktober-2007
.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 des
essences
Ta slovenski standard je istoveten z: EN 1912:2004/prA2
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
NORME EUROPÉENNE
EUROPÄISCHE NORM
prA2
August 2007
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 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 A2, if approved, will modify the European Standard EN 1912:2004. 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
© 2007 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN 1912:2004/prA2:2007: E
worldwide for CEN national Members.

Contents Page
Foreword.3
1 Modifications to Table 1.4

Foreword
This document (EN 1912:2004/prA2:2007) 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 Table 1 with the following new one where SI grade of spruce from Slovakia has been moved from
C22 to C24.
"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 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

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,
27, 32, 34, 45
SLF Sel Douglas fir-Larch USA & Canada 18, 54
SLF Sel Hem-fir USA & Canada 2, 4, 5, 7, 8, 62
SLF Sel S-P-F USA & Canada 3, 6, 23, 25, 26,
27, 32, 34, 45
UK SS Paraná pine
...