SIST EN 1912:2005/kFprA4:2009

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 de 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: 29-Nov-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/FprA4 - Structural timber - Strength classes - Assignment of visual grades and species

Relations

• Consolidated By: SIST EN 1912:2004+A4:2010 - 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: 01-Nov-2009

Overview

EN 1912:2004/FprA4 - prepared by CEN/TC 124 - is a draft amendment to the European standard EN 1912 that defines how visual grading rules and commercial species names are assigned to recognised strength classes for structural timber. The amendment updates the tables and annexes that map national grading rules and species to European strength classes (C and D classes), and clarifies the grading standards referenced for compliance. Note: the document extract provided is a draft amendment (FprA4) and is distributed for review; it is subject to change.

Key topics

• Assignment of visual grades to strength classes
  • Tables map national visual grading rules (e.g., S13, ST-I, J&P Sel) and commercial grades to European strength classes (C35–C14 for softwoods, D70–D30 for hardwoods).
  • Example species appearing in the tables: spruce, fir, Douglas‑fir, pines, larch, poplar, and many hardwoods (e.g., beech, oak, iroko, teak).
• Identification of species
  • Table 4 lists botanical names with identification numbers (e.g., Acer pseudoplatanus added in this amendment).
• Updates and amendments
  • FprA4 modifies Tables 1, 2, 4 and Annex A.1 (grading standards), including additions such as Czech Republic standards, German maple in D30 and other country-specific assignments.
• Referenced grading standards
  • Annex A.1 cross-references national grading rules (DIN, NF, BS, NGRDL, INSTA, UNE, NP, ČSN, etc.) used to justify mappings to EN strength classes.
• Harmonisation purpose
  • The standard harmonises how visually graded timber from different countries and grading systems is categorised into common strength classes for structural design and trade.

Applications

• Structural engineers and designers use EN 1912 to:
  • Select appropriate timber strength classes for load-bearing elements.
  • Interpret supplier grade labels from different countries.
• Timber producers, visual graders and sawmills use it to:
  • Align national grading practices with European strength classes for export and CE marking.
  • Ensure consistency of product declarations when supplying structural timber.
• Specifiers, architects, builders and inspectors use it to:
  • Verify that delivered timber grades meet project strength-class requirements.
  • Cross-check species and grade compatibility across borders.

Related standards

• EN 14081 (machine grading and conformance rules) - referenced for combined grading compliance.
• National grading standards cited in Annex A.1, e.g.:
  • Germany: DIN 4074
  • France: NF B 52‑001
  • UK: BS 4978 / BS 5756
  • Netherlands: NEN 5480
  • Nordic rules: INSTA 142
  • USA/Canada: NGRDL and NLGA grading rules
  • Spain: UNE 56‑544 / UNE 56‑546
  • Czech Republic: ČSN 73 2824‑1

Keywords: structural timber, strength classes, visual grading, timber species, EN 1912, CEN, grading standards, timber strength, grading rules.

Standards Content (Sample)

SLOVENSKI STANDARD
01-november-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 de des
essences
Ta slovenski standard je istoveten z: EN 1912:2004/FprA4
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
prA4
September 2009
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 A4, 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: 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/FprA4:2009: 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 4. .4
4 Modifications to Table A.1 .4

Foreword
This document (EN 1912:2004/FprA4:2009) 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.
In C30, C24 and C16, Czech Republic has been added under Germany and Austria.
In C22, Spanish pines have been added.
2 Modifications to Table 2
Replace existing Table 2 with the attached Table 2.
In D30, German Maple has been added.
3 Modifications to Table 4
Replace existing Table 4 with the attached Table 4.
Acer pseudoplatanus has been added.
4 Modifications to Table A.1
Replace existing Table A.1 with the attached Table A.1.
Czech Republic standard has been added.

"
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
Czech S13 Fir CNE Europe 1
Republic 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
Czech S10 Fir CNE Europe 1
Republic 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
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
C24 USA &
SLF Sel Douglas fir-Larch USA & Canada 18, 54
Canada 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 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
Spain MEG Scots pine Spain 47 Minimum
MEG Laricio pine Spain 39 thickness &
width is 70mm
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
...