EN 335:2013
(Main)Durability of wood and wood-based products - Use classes: definitions, application to solid wood and wood-based products
Durability of wood and wood-based products - Use classes: definitions, application to solid wood and wood-based products
This European Standard is applicable to solid wood and wood-based products.
This European Standard defines five use classes that represent different service situations to which wood and wood-based products can be exposed. This standard also indicates the biological agents relevant to each situation.
A use class is not a performance class and does not give guidance for how long wood and wood-based product will last in service.
Dauerhaftigkeit von Holz und Holzprodukten - Gebrauchsklassen: Definitionen, Anwendung bei Vollholz und Holzprodukten
Diese Europäische Norm gilt für Vollholz und Holzprodukte.
Diese Europäische Norm legt fünf Gebrauchsklassen fest, die die verschiedenen Nutzungssituationen repräsentieren, denen Holz und Holzprodukte ausgesetzt sein können. Diese Norm enthält zudem Aussagen, welche Organismen unter den jeweiligen Bedingungen von Bedeutung sind.
Eine Gebrauchsklasse ist keine Leistungsklasse und beschreibt nicht die zu erwartende Gebrauchsdauer des Holzes und der Holzprodukte.
Durabilité du bois et des matériaux à base de bois - Classes d'emploi: définitions, application au bois massif et aux matériaux à base de bois
Cette Norme européenne est applicable aux produits en bois et à base de bois.
Cette Norme européenne définit cinq classes d’emploi qui correspondent aux différentes situations en service auxquelles peuvent être exposés le bois et les matériaux à base de bois. Cette Norme indique également les agents biologiques correspondant à chaque situation.
Une classe d’emploi n’est pas une classe de performance et ne donne pas d’indication concernant la durée de vie du bois en service des produits en bois et à base de bois.
Trajnost lesa in lesnih proizvodov - Razredi uporabe: definicije, uporaba pri masivnem lesu in lesnih ploščah
Ta evropski standard se uporablja za masivni les in lesne proizvode. Ta evropski standard določa pet razredov uporabe, ki ustrezajo različnim razmeram, kjer se lahko uporabljajo les in lesni proizvodi. V standardu so opisani tudi biološki dejavniki, značilni za posamezen razred uporabe. Razred uporabe ni razred učinkovitosti in ne podaja smernic glede življenjske dobe lesa in lesnih proizvodov na določenem mestu uporabe.
General Information
Relations
Standards Content (Sample)
SLOVENSKI STANDARD
01-september-2013
1DGRPHãþD
SIST EN 335-1:2006
SIST EN 335-2:2006
SIST EN 335-3:2002
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PDVLYQHPOHVXLQOHVQLKSORãþDK
Durability of wood and wood- based products - Use classes: definitions, application to
solid wood and wood based panels
Dauerhaftigkeit von Holz und Holzprodukten - Gebrauchsklassen: Definitionen,
Anwendung bei Vollholz und Holzwerkstoffen
Durabilité du bois et des matériaux à base de bois - Classes d'emploi: définitions,
application au bois massif et aux panneaux à base de bois
Ta slovenski standard je istoveten z: EN 335:2013
ICS:
71.100.50 .HPLNDOLMH]D]DãþLWROHVD Wood-protecting chemicals
79.040 Les, hlodovina in žagan les Wood, sawlogs and sawn
timber
79.060.01 /HVQHSORãþHQDVSORãQR Wood-based panels in
general
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
EUROPEAN STANDARD
EN 335
NORME EUROPÉENNE
EUROPÄISCHE NORM
March 2013
ICS 71.100.50; 79.040 Supersedes EN 335-1:2006, EN 335-2:2006, EN 335-
3:1995
English Version
Durability of wood and wood-based products - Use classes:
definitions, application to solid wood and wood-based products
Durabilité du bois et des matériaux à base de bois - Dauerhaftigkeit von Holz und Holzprodukten -
Classes d'emploi: définitions, application au bois massif et Gebrauchsklassen: Definitionen, Anwendung bei Vollholz
aux matériaux à base de bois und Holzprodukten
This European Standard was approved by CEN on 5 February 2013.
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, Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania,
Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and United
Kingdom.
EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION
EUROPÄISCHES KOMITEE FÜR NORMUNG
Management Centre: Avenue Marnix 17, B-1000 Brussels
© 2013 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN 335:2013: E
worldwide for CEN national Members.
Contents Page
Foreword .3
Introduction .4
1 Scope .5
2 Normative references .5
3 Terms and definitions .5
4 Use classes: application to wood and wood-based products .5
4.1 General .5
4.2 Use class 1 (UC 1) .5
4.3 Use class 2 (UC 2) .6
4.4 Use class 3 (UC 3) .6
4.4.1 General .6
4.4.2 Sub-class 3.1 (UC 3.1) .6
4.4.3 Sub-class 3.2 (UC 3.2) .6
4.5 Use class 4 (UC 4) .6
4.6 Use class 5 (UC 5) .7
4.7 Summary of use classes for wood and wood-based products .8
Annex A (informative) Service classes according to EN 1995-1-1 .9
Annex B (informative) Additional information for the assignment of use classes . 10
Annex C (informative) Information on biological agents . 11
C.1 General . 11
C.2 Fungi . 11
C.2.1 General . 11
C.2.2 Wood-destroying fungi . 11
C.2.3 Wood-disfiguring fungi . 11
C.3 Insects . 12
C.3.1 Coleoptera (beetles) . 12
C.3.2 Isoptera (termites). 12
C.4 Marine borers . 13
Bibliography . 14
Foreword
This document (EN 335:2013) has been prepared by Technical Committee CEN/TC 38 “Durability of wood
and wood-based products”, the secretariat of which is held by AFNOR.
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 September 2013, and conflicting national standards shall be
withdrawn at the latest by September 2013.
Attention is drawn to the possibility that some of the elements of this document may be the subject of patent
rights. CEN [and/or CENELEC] shall not be held responsible for identifying any or all such patent rights.
This document supersedes EN 335-3:1995, EN 335-1:2006 and EN 335-2:2006.
Compared to EN 335, parts 1 to 3, the main modifications are as follows:
1) the former three parts of EN 335 have been combined;
2) the subclasses 3.1 and 3.2 have been redefined;
3) the subdivision of use class 4 has been omitted.
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, Former Yugoslav Republic of Macedonia, France, Germany, Greece,
Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal,
Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and the United Kingdom.
Introduction
This standard gives general definitions of use classes for different service situations and is relevant to solid
wood and wood-based products.
This standard gives information on the biological agents that can attack wood and wood-based products in
defined situations.
The possibility of alignment between the three service classes of Eurocode 5 (EN 1995-1-1) and the five use
classes of EN 335 has been carefully studied. It is important to note that the two systems use different criteria
to achieve different results.
Annex A gives guidance on relationships between use classes and service classes.
Annex B gives additional information for the assignment of use classes.
Annex C gives information on biological agents.
1 Scope
This European Standard is applicable to solid wood and wood-based products.
This European Standard defines five use classes that represent different service situations to which wood and
wood-based products can be exposed. This standard also indicates the biological agents relevant to each
situation.
A use class is not a performance class and does not give guidance for how long wood and wood-based
product will last in service.
2 Normative references
The following documents, in whole or in part, are normatively referenced in this document and are
indispensable for its application. For dated references, only the edition cited applies. For undated references,
the latest edition of the referenced document (including any amendments) applies.
EN 1001-2:2005, Durability of wood and wood-based products — Terminology — Part 2:Vocabulary
EN 1995-1-1, Eurocode 5 — Design of timber structures — Part 1-1: General — Common rules and rules for
buildings
3 Terms and definitions
For the purposes of this document, the terms and definitions given in EN 1001-2:2005 and the following apply.
3.1
service situation
situation of exposure of the wood element in use
3.2
wood-based product
any products containing wood
Note 1 to entry: For instance solid wood panel, laminated veneer lumber (LVL), plywood, oriented strand board (OSB),
resin-bonded particleboard, cement-bonded particleboard or fibreboard, modified wood are wood-based products.
4 Use classes: application to wood and wood-based products
4.1 General
The differences between the use classes are based on differences in environment exposures that can make
the wood or wood-based products susceptible to biological deterioration.
NOTE Border line and extreme cases of use of wood and wood-based products exist. This can cause the assignment
of a use class that differs from that defined in this standard (see Annex B).
4.2 Use class 1 (UC 1)
Situations in which the wood or wood-based product is inside a construction, not exposed to the weather and
wetting.
The attack by disfiguring fungi or wood-destroying fungi is insignificant and always accidental.
Attack by wood-boring insects, including termites, is possible although the frequency and importance of the
1)
insect occurrence depends on the geographical region .
4.3 Use class 2 (UC 2)
Situations in which the wood or wood-based product is under cover and not exposed to the weather
(particularly rain and driven rain) but where occasional, but not persistent, wetting can occur.
In this use class, condensation of water on the surface of wood and wood-based products may occur.
Attack by disfiguring fungi and wood-destroying fungi is possible.
Attack by wood-boring insects, including termites, is possible although the frequency and importance of the
1)
insect risk depends on the geographical region .
4.4 Use class 3 (UC 3)
4.4.1 General
Situations in which the wood or wood-based product is above ground and exposed to the weather (particularly
rain).
Attack by disfiguring fungi and wood-destroying fungi is possible.
Attack by wood-boring insects, including termites, is possible although the frequency and importance of the
1)
insect risk depends on the geographical region .
A large variety of in-use situations exists and, when relevant, use class 3 may be divided into two sub-classes
use class 3.1 and use class 3.2.
NOTE Decay risk depends on the climatic and other in-use conditions (temperature, RH, rainfall, structural
conditions, design details and maintenance provisions).
4.4.2 Sub-class 3.1 (UC 3.1)
In this situation the wood and wood-based products will not remain wet for long periods. Water will not
accumulate.
NOTE This may be achieved by, for example, a maintained and suitable coating, or by design or orientation of
components to shed water or to dry quickly.
4.4.3 Sub-class 3.2 (UC 3.2)
In this situation the wood and wood-based products will remain wet for long periods. Water may accumulate.
NOTE Components are not designed or orientated to shed water or dry quickly.
4.5 Use class 4 (UC 4)
A situation in which the wood or wood-based product is in direct contact with ground and/or fresh water.
Attack by disfiguring fungi and wood-destroying fungi is possible.
1)
If national standards do not specify the risk of insect attack, local or national experts should be consulted for advice on
the risk of insect attack.
Attack by wood-boring insects, including termite
...
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