SIST EN 14081-1:2006/kprA1:2010

Timber structures - Strength graded structural timber with rectangular cross section - Part 1: General requirements

This European Standard specifies the requirements for visual and machine graded structural timber with rectangular cross-sections shaped by sawing, planing or other methods, and having deviations from the target sizes corresponding to EN 336.
This European Standard covers structural rectangular timber, untreated or treated against biological attack.
This European Standard does not cover timber treated by fire retardant products.
This European Standard identifies as a minimum the characteristics for which limits shall be given in visual grading rules.
Finger jointed timber is not covered in this European Standard.

Holzbauwerke - Nach Festigkeit sortiertes Bauholz für tragende Zwecke mit rechteckigem Querschnitt - Teil 1: Allgemeine Anforderungen

Structures en bois - Bois de structure de section rectangulaire classé pour sa résistance - Partie 1: Exigences générales

Lesene konstrukcije - Razvrščanje konstrukcijskega lesa pravokotnega prečnega prereza po trdnosti - 1. del: Splošne zahteve

General Information

• Status: Not Published
• Public Enquiry End Date: 14-Nov-2010
• ICS: 79.040 - Wood, sawlogs and sawn timber
• ICS: 91.080.20 - Timber structures
• Technical Committee: KON.005 - Timber structures
• Current Stage: 98 - Abandoned project (Adopted Project)
• Start Date: 24-Mar-2011
• Due Date: 29-Mar-2011
• Completion Date: 24-Mar-2011
• Directive: 305/2011 - Regulation (eu) No 305/2011 of the European Parliament and of the Council of 9 march 2011 laying down harmonised conditions for the marketing of construction products and repealing council directive 89/106/eec
• Directive: 89/106/EEC - Construction products
• Mandate: M/112 - Mandate to CEN/CENELEC concerning the execution of standardization work for harmonized standards on structural timber products
• Ref Project: EN 14081-1:2005/FprA1 - Timber structures - Strength graded structural timber with rectangular cross section - Part 1: General requirements

Relations

• Consolidated By: SIST EN 14081-1:2006+A1:2011 - Timber structures - Strength graded structural timber with rectangular cross section - Part 1: General requirements
• Effective Date: 29-Nov-2010

Overview

SIST EN 14081-1:2006/kprA1:2010 is a European standard developed by CEN (European Committee for Standardization) that specifies the general requirements for strength graded structural timber with rectangular cross sections. This timber is either visually or machine graded and is shaped by sawing, planing, or other methods, adhering to dimensional tolerances aligned with EN 336. The standard covers both untreated timber and timber treated to resist biological attack but excludes timber treated with fire retardant products or finger jointed timber.

This standard is essential for ensuring the structural integrity and reliability of timber used in construction, focusing on quality assurance through detailed grading, marking, and certification procedures. It supports compliance with EU regulations and provides clear guidelines on marking, including CE marking, that enable traceability and performance verification of graded timber.

Key Topics

• Scope and Timber Types

  • Applies to structural timber with rectangular cross-section.
  • Covers visually and machine strength graded timber.
  • Includes untreated or timber treated against biological attack.
  • Excludes finger jointed timber and timber treated with fire retardants.

• Dimensional Tolerances

  • Conformance with size deviations as per EN 336.
  • Prescribes permissible variations during sawing, planing, or other shaping processes.

• Grading Methods

  • Visual grading with specified strength classes according to EN 1912.
  • Machine grading based on EN 14081-4 standards.
  • Performance characteristics include modulus of elasticity, bending strength, compressive strength, tensile strength, and shear strength.

• Marking Requirements

  • Two methods:
    • Method A: Individual piece marking.
    • Method B: Package marking with attached labels.
  • Marking must provide identification of the manufacturer, grading information, drying status, treatment information, and grade/class details.
  • Mandatory accompanying commercial documentation detailing timber characteristics and intended uses.

• CE Marking

  • Ensures conformity with EU Construction Products Regulation.
  • Simplified CE marking: placed on timber or package indicating manufacturer, certification body, grade, and treatment.
  • Complete CE marking: detailed information in accompanying documents covering performance, durability, fire reaction, and release of substances.

• Durability and Treatment

  • Specifies classification of natural durability against biological attack (EN 350-2).
  • For treated timber, mandatory declaration of preservative type, use class, retention values, and penetration per EN 335 and EN 15228.

Uses and Applications

• Construction Industry

  • Essential for structural framing, beams, joists, and load-bearing timber components.
  • Used by architects, engineers, and builders to select timber that meets safety and performance criteria.

• Timber Grading and Manufacturing

  • Guides sawmills, timber processors, and treatment plants in production and quality control.
  • Establishes standardization in strength grading to facilitate reliable timber supply chains.

• Regulatory Compliance

  • Supports manufacturers and suppliers in meeting EU directives and regulations for construction products.
  • Facilitates market access across CEN member countries through harmonized standards and CE marking.

• Quality Assurance and Traceability

  • Enables traceable marking systems ensuring timber identity and conformity.
  • Helps maintain structural safety and performance over the timber's lifespan.

Related Standards

• EN 336: Dimensional Tolerances for Structural Timber
• EN 1912: Strength Classes of Structural Timber – Assignment of Visual Grades and Species
• EN 14081-4: Machine Grading of Structural Timber – Grading Systems and Calibration
• EN 335-1 and EN 335-2: Durability of Wood and Wood-Based Products – Use Classes and Applications
• EN 350-2: Durability of Wood and Wood-Based Products – Natural Durability Classification
• EN 15228: Round and Sawn Timber – Specification of Preservative Treatment for Timber
• EN 13501-1: Fire Classification of Construction Products and Building Elements

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SIST EN 14081-1:2006/kprA1:2010 plays a critical role in ensuring the safety, quality, and market compliance of strength graded structural timber in Europe. It is widely adopted by timber producers, construction professionals, and regulatory authorities seeking to uphold high performance standards for timber used in building structures.

Standards Content (Sample)

SLOVENSKI STANDARD
01-november-2010
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WUGQRVWLGHO6SORãQH]DKWHYH
Timber structures - Strength graded structural timber with rectangular cross section -
Part 1: General requirements
Holzbauwerke - Nach Festigkeit sortiertes Bauholz für tragende Zwecke mit
rechteckigem Querschnitt - Teil 1: Allgemeine Anforderungen
Structures en bois - Bois de structure de section rectangulaire classé pour sa résistance
- Partie 1: Exigences générales
Ta slovenski standard je istoveten z: EN 14081-1:2005/FprA1
ICS:
79.040 Les, hlodovina in žagan les Wood, sawlogs and sawn
timber
91.080.20 Lesene konstrukcije Timber structures
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

EUROPEAN STANDARD
FINAL DRAFT
EN 14081-1:2005
NORME EUROPÉENNE
EUROPÄISCHE NORM
FprA1
August 2010
ICS 79.040
English Version
Timber structures - Strength graded structural timber with
rectangular cross section - Part 1: General requirements
Structures en bois - Bois de structure à section Holzbauwerke - Nach Festigkeit sortiertes Bauholz für
rectangulaire classé pour sa résistance - Partie 1: tragende Zwecke mit rechteckigem Querschnitt - Teil 1:
Exigences générales Allgemeine Anforderungen
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 A1, if approved, will modify the European Standard EN 14081-1:2005. 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, Croatia, 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
© 2010 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN 14081-1:2005/FprA1:2010: E
worldwide for CEN national Members.

Contents Page
Foreword .3
1 Modification to the French title .4
2 Modification to Clause 3, “Terms and definitions” .4
3 Modifications to Clause 2, “Normative references” .4
4 Modifications to Clause 7, “Marking” .4
7.1 General .4
7.2 Information either on the timber or on its package .5
7.3 Information in the documents accompanying either the timber or package of such timber .5
5 Modifications to ZA.3, “CE marking” .6
ZA.3.1 General .6
ZA.3.2 Simplified CE marking .6
ZA.3.3 Complete CE marking .7

Foreword
This document (EN 14081-1:2005/FprA1:2010) 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 Unique Acceptance Procedure.
This document has been prepared under a mandate given to CEN by the European Commission and the
European Free Trade Association, and supports essential requirements of EU Directive(s).
For relationship with EU Directive(s), see informative Annex ZA, which is an integral part of this document.
This amendment introduces a new definition for package in Clause 3 and replaces the provisions in Clause 7
on marking and in ZA.3 on CE marking.
1 Modification to the French title
Replace the second element of the French title with:
"Bois de structure à section rectangulaire classé pour sa résistance".
2 Modification to Clause 3, “Terms and definitions”
Add the following new term and definition:
"3.15
package
timber of one grade, one species or species combination, and one cross section size or of multiple sizes
where the timber is to be used for one structure, graded in one working shift to be delivered to one customer".
3 Modifications to Clause 2, “Normative references”
Add the following references:
"EN 335-1, Durability of wood and wood-based products — Definition of use classes — Part 1: General
EN 335-2, Durability of wood and wood-based products — Definition of use classes — Part 2: Application to
solid wood".
Replace "EN 14081-4:2005" with "EN 14081-4:2009" in Clause 2 and 5.3.3.
Replace "prEN 15228" with "EN 15228" in Clause 2 and 5.4.
Replace "(ISO 3166-1:1997)" with "(ISO 3166-1:2006)".
4 Modifications to Clause 7, “Marking”
Replace the existing 7.1, 7.2 and 7.3, except Table 4, with the following new 7.1, 7.2 and 7.3: "
7.1 General
Two methods for marking exist:
a) Method A (i.e. individual piece marking):
Each piece of graded structural timber shall be clearly and indelibly marked to provide the information
given in 7.2. In addition, the information listed in 7.3 together with those in 7.2 shall be given in a
commercial document, accompanying each package of such timber.
b) Method B (i.e. package marking):
Each package of graded structural timber shall be clearly and indelibly marked with a label attached to
the package to provide the information given in 7.2. In addition, the information listed in 7.3 together with
those in 7.2 shall be given in a commercial document, accompanying each package of such timber.
Visually strength graded structural timber shall be marked according to either Method A or Method B.
NOTE 1 National regulations may exist which limit the method to be used.
Machine strength graded timber shall be marked according to Method A.
NOTE 2 For information on CE marking see ZA.3.2 and ZA.3.3.
7.2 Information either on the timber or on its package
The following information shall be given on the graded structural timber or on the package of such timber:
a) name or identifying mark of the manufacturer;
NOTE 1 Registered address of the manufacturer may also be added.
b) parameters that describe the timber and intended use:
 grade and grading standard, where visually graded;
NOTE 2 This information should be read in conjunction with that given below under c).
 letter “M”, where machine graded;
 words “DRY GRADED” for dry-graded timber, where relevant (see 3.4);
NOTE 3 An alternative wording may be used provided that it relates to the timber dried down to at least the level given
in 3.4 and that it is clearly defined in the commercial document, accompanying the timber.
 identification code number, which identifies product from the accompanying documents;
 specific end use of timber if relevant (see 5.1.4 and 5.2.3);
c) performance of some of the characteristics of the timber, i.e. modulus of elasticity (mean), bending
strength, compressive strength, tensile strength, shear strength, declared by reference to a single
strength class or strength grade:
 for visually graded timber, the strength grade may be assigned to a strength class, see
EN 1912:2004+A4;
 for machine graded timber, the strength class or grade shall be taken from EN 14081-4.
d) letters " PT" where the timber has been treated against biological attack.
NOTE 4 Where ZA.3 covers the same information as this clause, the requirements of this clause are met.
7.3 Information in the documents accompanying either the timber or package of such
timber
The following information, in addition to that specified in 7.2, shall be given in the commercial documents,
accompanying the timber or a package of such timber:
NOTE 1 One accompanying document may contain information on more than one package provided that all relevant
information, applicable to all such packages is given.
a) identification code number, which refers to the relevant products;
b) number of this European Standard, and the year of its publication (i.e. EN 14081-1:2005+A1:2010);
c) description of the timber and its intended use, declared as:
 species code as specified either:
• in Table B.1, in accordance with EN 13556, if single species, or
• in Table 4, if species combination;
 code identifying the country or region of origin in accordance with EN ISO 3166-1, when machine
graded;
d) durability performance (i.e. resistance to biological organisms) of the timber:
 when without preservative treatment (i.e. natural durability): declared as classification against wood
destroying fungi, insects, termites and marine borers, according to EN 350-2, or
 when with preservative treatment in accordance with EN 15228: indication “PT” and declared as “use
class” in accordance with EN 335-1 and EN 335-2, together with type of preservative, critical
retention value and penetration class.
NOTE 2 Where ZA.3 covers the same information as this clause, the requirements of this clause are met.".
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