Durability of wood and wood-based products - Guidance on performance

This document gives guidance on the selection of wood and wood-based products for use in situations where they can be subject to degradation by fungi, wood destroying insects or marine borers. This guidance includes information on factors that can influence the service life of a wood or wood-based product when considering biological degradation. In many end uses, design, workmanship and maintenance will also influence the service life of the wood or wood-based product.
This document is a step toward the evaluation of the service life of a wood product.
This document does not consider:
1)   the durability characteristics of the glue used in wood-based products;
2)   the aesthetic function of wood products (discoloration, surface weathering, mould).

Dauerhaftigkeit von Holz und Holzprodukten - Leitfaden zur Bestimmung der Leistungsfähigkeit

Dieses Dokument gibt eine Anleitung zur Auswahl von Holz und Holzprodukten zur Verwendung unter Bedingungen, in denen sie der Zerstörung durch Pilze, Holz zerstörende Insekten oder marine Organismen ausgesetzt sein können. Diese Anleitung enthält Informationen über Faktoren, die die Gebrauchsdauer eines Holzes oder Holzproduktes unter Berücksichtigung des biologischen Abbaus beeinflussen können. Bei vielen Gebrauchsbedingungen haben Konstruktion, Verarbeitung und Instandhaltung ebenfalls einen Einfluss auf die Gebrauchsdauer des Holzes oder des Holzproduktes.
Dieses Dokument ist ein Ansatz zur Bewertung der Gebrauchsdauer eines Holzprodukts.
Dieses Dokument berücksichtigt nicht:
1)   die Dauerhaftigkeit des Klebstoffs, der in Holzprodukten verwendet wurde;
2)   die ästhetische Funktion von Holzprodukten (Verfärbung, Oberflächenverwitterung, Schimmel).

Durabilité du bois et des matériaux à base de bois - Guide pour déterminer la performance

Le présent document fournit des recommandations relatives au choix de bois et de matériaux à base de bois pour une utilisation dans des situations où ils peuvent être soumis à une dégradation par des champignons, des insectes xylophages ou des térébrants marins. Ces recommandations incluent des informations sur les facteurs susceptibles d'influer sur la durée de service d'un bois ou d'un matériau à base de bois, compte tenu de la dégradation biologique. Dans de nombreux types d'usages, la conception, la fabrication et l'entretien auront également une incidence sur la durée de service du bois ou du matériau à base de bois.
Le présent document constitue un progrès vers l'évaluation de la durée de service des éléments en bois.
Le présent document ne traite pas :
1)   des caractéristiques de durabilité de la colle utilisée avec les matériaux à base de bois ;
2)   de la fonction esthétique des éléments en bois (décoloration, vieillissement d'aspect de la surface, moisissure).

Trajnost lesa in lesnih proizvodov - Navodilo za učinkovitost

Ta dokument vsebuje navodilo za izbor lesa in lesnih proizvodov za uporabo v pogojih, kjer lahko obstaja možnost razgradnje zaradi gliv ali organizmov, ki uničujejo les. Navodilo vključuje informacije o dejavnikih, ki lahko vplivajo na življenjsko dobo lesa ali lesnih proizvodov ob upoštevanju biološke razgradnje. Ta dokument je korak v smeri ocenjevanja življenjske dobe lesnega izdelka.
Dokument ne upošteva:
1)   lastnosti trajnosti lepila, ki se uporablja v lesnih izdelkih;
2)   estetske funkcije lesnih proizvodov (razbarvanje, pospešeno staranje površine, plesen.

General Information

Status
Published
Publication Date
14-Feb-2023
Current Stage
6060 - Definitive text made available (DAV) - Publishing
Start Date
15-Feb-2023
Due Date
21-Dec-2022
Completion Date
15-Feb-2023

Relations

Buy Standard

Standard
EN 460:2023
English language
20 pages
sale 10% off
Preview
sale 10% off
Preview
e-Library read for
1 day

Standards Content (Sample)


SLOVENSKI STANDARD
01-junij-2023
Nadomešča:
SIST EN 460:1995
Trajnost lesa in lesnih proizvodov - Navodilo za učinkovitost
Durability of wood and wood-based products - Guidance on performance
Dauerhaftigkeit von Holz und Holzprodukten - Leitfaden zur Bestimmung der
Leistungsfähigkeit
Durabilité du bois et des matériaux à base de bois - Guide pour déterminer la
performance
Ta slovenski standard je istoveten z: EN 460:2023
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.

EN 460
EUROPEAN STANDARD
NORME EUROPÉENNE
February 2023
EUROPÄISCHE NORM
ICS 79.040 Supersedes EN 460:1994
English Version
Durability of wood and wood-based products - Guidance
on performance
Durabilité du bois et des matériaux à base de bois - Dauerhaftigkeit von Holz und Holzprodukten -
Guide pour déterminer la performance Leitfaden zur Bestimmung der Leistungsfähigkeit
This European Standard was approved by CEN on 2 January 2023.

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-CENELEC 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-CENELEC 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, Republic of North Macedonia, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Türkiye and
United Kingdom.
EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION

EUROPÄISCHES KOMITEE FÜR NORMUNG

CEN-CENELEC Management Centre: Rue de la Science 23, B-1040 Brussels
© 2023 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN 460:2023 E
worldwide for CEN national Members.

Contents Page
European foreword . 3
Introduction . 4
1 Scope . 5
2 Normative references . 5
3 Terms and definitions . 5
4 Performance . 7
4.1 General . 7
4.2 Exposure . 8
4.2.1 General . 8
4.2.2 Climate . 8
4.2.3 Use class . 9
4.2.4 Design . 9
4.2.5 Quality of installation . 9
4.2.6 Maintenance . 9
4.2.7 Usage . 10
4.3 Consequence of failure . 10
4.4 Service life . 10
4.4.1 General . 10
4.4.2 Limit state . 11
4.5 Materials . 11
4.5.1 General . 11
4.5.2 Natural durability . 11
4.5.3 Conferred durability . 11
4.5.4 Guidelines . 12
5 Requirements on biological durability in different end use conditions . 12
5.1 General . 12
5.2 Durability against wood-destroying fungi . 13
5.3 Durability against beetles . 13
5.4 Durability against termites . 13
5.5 Durability against marine borers . 13
5.6 Durability against combined biological hazards . 13
Annex A (informative) Consequence of Failure (COF) . 14
Annex B (informative) Guidance on the durability classes of wood species in use class . 15
Annex C (informative) Important factors in the relationship between expected service life
and biological durability . 17
Bibliography . 19

European foreword
This document (EN 460:2023) has been prepared by Technical Committee CEN/TC 38 “Durability of
wood and wood-based products”, the secretariat of which is held by SIS.
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 August 2023, and conflicting national standards shall be
withdrawn at the latest by August 2023.
Attention is drawn to the possibility that some of the elements of this document may be the subject of
patent rights. CEN shall not be held responsible for identifying any or all such patent rights.
This document supersedes EN 460:1994.
— title change;
— the introduction of a decision process for performance specification of wood and wood-based
products based on (i) materials and exposure, (ii) presentation of design life and (iii) articulation of
consequence of failure.
This document has been prepared under a Standardization Request given to CEN by the European
Commission and the European Free Trade Association.
Any feedback and questions on this document should be directed to the users’ national standards body.
A complete listing of these bodies can be found on the CEN website.
According to the CEN-CENELEC Internal Regulations, the national standards organisations of the
following countries are bound to implement this European Standard: 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, Republic of North
Macedonia, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Türkiye and the United
Kingdom.
Introduction
There is increasing need to understand the service life of wood products, especially in construction.
Service life in the Construction Products Regulation (Regulation (EU) No 305/2011 (CPR) and its
equivalent in non-EU countries) can be understood as performance within an economically acceptable
period, under typical exposure and maintenance scenarios.
This document is concerned with the service life of wood materials and wood products, especially in
construction. The purpose of this document is to provide guidance to help the user to select a wood or
wood-based material based of appropriate biological durability based on information about the end use
environment and the target service life.
For the service life of structures, refer to EN 1990 and EN 1995-1-1.
1 Scope
This document gives guidance on the selection of wood and wood-based products for use in situations
where they can be subject to degradation by fungi, wood destroying insects or marine borers. This
guidance includes information on factors that can influence the service life of a wood or wood-based
product when considering biological degradation. In many end uses, design, workmanship and
maintenance will also influence the service life of the wood or wood-based product.
This document is a step toward the evaluation of the service life of a wood product.
This document does not consider:
1) the durability characteristics of the glue used in wood-based products;
2) the aesthetic function of wood products (discoloration, surface weathering, mould).
2 Normative references
The following documents are referred to in the text in such a way that some or all of their content
constitutes requirements 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 1001-2, Durability of wood and wood based products — Terminology — Part 2: Vocabulary
3 Terms and definitions
For the purposes of this document, the terms and definitions given in EN 1001-2 and the following apply.
ISO and IEC maintain terminology databases for use in standardization at the following addresses:
• ISO Online browsing platform: available at https://www.iso.org/obp
• IEC Electropedia: available at https://www.electropedia.org/
3.1
biological durability
inherent resistance of a wood species or a wood-based material against wood-destroying organisms
Note 1 to entry: This can be a natural or a conferred durability.
3.2
coating
product, normally applied in a liquid form to a surface, that forms a film possessing protective properties
3.3
component
product manufactured as a distinct unit to serve a specific function or functions
3.4
conferred durability
improved resistance of a wood species to biological degradants provided by a treatment process
(chemical, physical, etc.) such as wood preservation or wood modification
3.5
consequence of failure (COF)
significance of product failure in service determined by the outcome of a failure expressed in terms of
personnel safety, economic loss, and/or damage to the environment
3.6
critical biological hazard
biological hazard (or hazards) most significant in the end use application and its geographical location
3.7
design life
service life intended by the designer
3.8
likelihood of failure
probability that a wood component will reach its limit state within the design life
3.9
limit state
state beyond which the structure (or product) no longer satisfies the relevant design criteria
[SOURCE : EN 1990:2002, Clause 3.1.2.14 (CEN/TC250/SC10 N 523)]
Note 1 to entry: The limit state is commonly reached before loss of function is complete.
3.10
material resistance
inherent ability of a material to endure a specific biological hazard through a combination of natural
and/or conferred durability and moisture dynamic behaviour relevant for the different biological agents
3.11
moisture dynamics
physical characteristic of a wood material or wood product to respond to changing environmental
conditions and take up and release moisture (vapour or liqui
...

Questions, Comments and Discussion

Ask us and Technical Secretary will try to provide an answer. You can facilitate discussion about the standard in here.