Durability of wood and wood-based products - Definition of use classes - Part 2: Application to solid wood

This part of EN 335 offers guidance on the application of the use classes, as defined in Part 1 to solid wood of EN 335, in relation to the biological agents that can attack solid wood and solid wood panels.
NOTE   Due to their specific behaviour against biological agents, solid wood panels are mentioned in this part and not in Part 3 of EN 335.
This Part shall be used in conjunction with Part 1 of EN 335.
Annex A gives information and guidance for the user to determine the appropriate use class and to select a suitable level of durability (either natural or conferred by preservative treatment). It does not give guidance on protective measures other than preservative treatment.

Dauerhaftigkeit von Holz und Holzprodukten - Definition der Gebrauchsklassen - Teil 2: Anwendung bei Vollholz

Dieser Teil von EN 335 gibt einen Leitfaden für die Anwendung der in Teil 1 von EN 335 festgelegten Ge-brauchsklassen
bei Vollholz in Bezug auf die Organismen, die Vollholz und Massivholzplatten befallen kön-nen.
ANMERKUNG Auf Grund ihres entsprechenden Verhaltens gegenüber den Organismen werden Massivholzplatten in
diesem Teil behandelt und nicht in Teil 3 von EN 335.
Dieser Teil sollte in Verbindung mit Teil 1 von EN 335 angewendet werden.
Anhang A enthält für den Benutzer Informationen und eine Anleitung zur Bestimmung der zutreffenden
Gebrauchsklasse und zur Auswahl eines geeigneten Grades der Dauerhaftigkeit (entweder natürlich oder
durch Schutzbehandlung erzielt). Er gibt keine Anleitung zu anderen Schutzmaßnahmen als die Behandlung
mit Holzschutzmitteln.

Durabilité du bois et des produits dérivés du bois - Définition des classes d'emploi - Partie 2 : Application au bois massif

La présente partie de l’EN 335 donne des indications sur l’application au bois massif des classes d’emploi
définies dans la Partie 1 de l’EN 335, en fonction des agents biologiques qui peuvent attaquer le bois massif
et les bois panneautés.
NOTE Les bois panneautés sont mentionnés dans la présente partie de l’EN335 et non pas dans la partie 3 en
raison de leur comportement spécifique contre les agents biologiques
La présente partie doit être utilisée conjointement avec la Partie 1 de l’EN 335.
L’Annexe A fournit des informations et des indications permettant à l’utilisateur de déterminer la classe
d’emploi appropriée et de sélectionner un niveau approprié de durabilité (caractéristique naturelle ou conférée
par un traitement de préservation). Elle ne fournit aucune indication à propos des mesures de protection
autres que le traitement de préservation.

Trajnost lesa in lesnih proizvodov - Definicije razredov uporabe - 2. del: Uporaba pri masivnem lesu

General Information

Status
Withdrawn
Publication Date
08-Aug-2006
Withdrawal Date
19-Mar-2013
Current Stage
9960 - Withdrawal effective - Withdrawal
Due Date
20-Mar-2013
Completion Date
20-Mar-2013

RELATIONS

Buy Standard

Standard
EN 335-2:2006
English language
13 pages
sale 10% off
Preview
sale 10% off
Preview
e-Library read for
1 day

Standards Content (sample)

2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.Trajnost lesa in lesnih proizvodov - Definicije razredov uporabe - 2. del: Uporaba pri masivnem lesuDauerhaftigkeit von Holz und Holzprodukten - Definition der Gebrauchsklassen - Teil 2: Anwendung bei VollholzDurabilité du bois et des produits dérivés du bois - Définition des classes d'emploi - Partie 2 : Application au bois massifDurability of wood and wood-based products - Definition of use classes - Part 2: Application to solid wood79.040Les, hlodovina in žagan lesWood, sawlogs and sawn timber71.100.50Wood-protecting chemicalsICS:Ta slovenski standard je istoveten z:EN 335-2:2006SIST EN 335-2:2006en01-december-2006SIST EN 335-2:2006SLOVENSKI

STANDARDSIST EN 335-2:19951DGRPHãþD
SIST EN 335-2:2006

EUROPEAN STANDARDNORME EUROPÉENNEEUROPÄISCHE NORMEN 335-2August 2006ICS 71.100.50Supersedes EN 335-2:1992

English VersionDurability of wood and wood-based products - Definition of useclasses - Part 2: Application to solid woodDurabilité du bois et des produits dérivés du bois -Définition des classes d'emploi - Partie 2 : Application aubois massifDauerhaftigkeit von Holz und Holzprodukten - Definition derGebrauchsklassen - Teil 2: Anwendung bei VollholzThis European Standard was approved by CEN on 7 July 2006.CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this EuropeanStandard the status of a national standard without any alteration. Up-to-date lists and bibliographical references concerning such nationalstandards may be obtained on application to the Central Secretariat or to any CEN member.This European Standard exists in three official versions (English, French, German). A version in any other language made by translationunder the responsibility of a CEN member into its own language and notified to the Central Secretariat has the same status as the officialversions.CEN members are the national standards bodies of Austria, Belgium, 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.EUROPEAN COMMITTEE FOR STANDARDIZATIONCOMITÉ EUROPÉEN DE NORMALISATIONEUROPÄISCHES KOMITEE FÜR NORMUNGManagement Centre: rue de Stassart, 36

B-1050 Brussels© 2006 CENAll rights of exploitation in any form and by any means reservedworldwide for CEN national Members.Ref. No. EN 335-2:2006: ESIST EN 335-2:2006

EN 335-2:2006 (E) 2 Contents Page Foreword......................................................................................................................................................................3 Introduction.................................................................................................................................................................4 1 Scope..............................................................................................................................................................5 2 Normative references....................................................................................................................................5 3 Terms and definitions...................................................................................................................................5 4 Use classes: application to solid wood.......................................................................................................6 4.1 Use class 1.....................................................................................................................................................6 4.2 Use class 2.....................................................................................................................................................6 4.3 Use class 3.....................................................................................................................................................6 4.4 Use class 4.....................................................................................................................................................6 4.5 Use class 5.....................................................................................................................................................6 4.6 Summary of use classes for solid wood.....................................................................................................7 Annex A (informative)

Guide for the application to solid wood in relation to durability...................................8 A.1 Introduction....................................................................................................................................................8 A.2 General decision making..............................................................................................................................8 A.3 General precautions....................................................................................................................................12 A.4 Natural or conferred durability of solid wood...........................................................................................12 Bibliography..............................................................................................................................................................13

SIST EN 335-2:2006

EN 335-2:2006 (E) 3 Foreword This document (EN 335-2:2006) has been prepared by Technical Committee CEN/TC 38 “Durability of wood and derived materials”, 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 February 2007, and conflicting national standards shall be withdrawn at the latest by February 2007. This document supersedes EN 335-2:1992. EN 335 is divided into three parts, Part 1 gives general definitions of use classes in different service situations, Part 2 concerns their application to solid wood and Part 3 concerns their application to wood-based panels The revision of EN 335-2 is in accordance with ISO 21887 (under preparation). NOTE Attention of users is drawn to the need to avoid misinterpretation of any numbering system using classes for timber which cannot correspond exactly to the European use classes defined in this part of EN 335. According to the CEN/CENELEC Internal Regulations, the national standards organizations of the following countries are bound to implement this European Standard: Austria, Belgium, 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. SIST EN 335-2:2006

EN 335-2:2006 (E) 4 Introduction The classes described in this part of EN 335 are based on an existing classification agreed by the European Homologation Committee (EHC) in 1981 and published in the EHC reference document in 1984. Proposals for altering the five classes of EHC classification have been considered, particularly the possibility of harmonisation with other classes used outside Europe. It has, however, been judged that five classes are the most appropriate solution to European conditions. The possibility of harmonisation between the three moisture categories of Eurocode 5 (EN 1995-1-1) and the five classes of all parts of EN 335 has been carefully studied. The latter have been adjusted as far as possible. Nevertheless, it is important to note that the two systems use different criteria to achieve different ends. Any user may utilise the appropriate part of EN 335 to identify the "use class" of a given service environment and geographical location. Table 1 will assist in determining the biological agents that can attack timber in that situation. The user can then consider the type and duration of performance required, select an appropriate level of durability and ensure that the timber or wood-based product specified has that durability either, as a natural (see EN 350-2) or an acquired characteristic as the result of appropriate preservative treatment (see EN 351-1). NOTE

At the moment EN 350-2 gives information with regard only to solid wood. EN 351-1 considers only the performance of preservative-treated solid wood.SIST EN 335-2:2006

EN 335-2:2006 (E) 5

1 Scope This part of EN 335 offers guidance on the application to solid wood of the use classes, as defined in Part 1 of EN 335, in relation to the biological agents that can attack solid wood and solid wood panels. NOTE Due to their specific behaviour against biological agents, solid wood panels are considered in this part of EN 335, as solid wood. This Part shall be used in conjunction with Part 1 of EN 335. Annex A gives information and guidance for the user to determine the appropriate use class and to select a suitable level of durability (either natural or conferred by preservative treatment). It does not give guidance on protective measures other than preservative treatment. 2 Normative references The following referenced documents are indispensable for the application 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. None applicable.

3 Terms and definitions For the purposes of this European Standard, the following terms and definitions apply. 3.1 protected subject to design and construction measures intended to prevent excessive exposure to the direct effects of the weather 3.2 solid wood wood, sawn or otherwise machined which may include finger jointed and/or laminated wood NOTE Adapted from EN 1001-2:2005, 1.39 3.3 solid wood panel wood-based panel consisting of pieces of timber glued together at their edges and, if multi-layer, on their faces [EN 12775:2001, 4.1] SIST EN 335-2:2006

EN 335-2:2006 (E) 6 4 Use classes: application to solid wood 4.1 Use class 1 In this environment the moisture content of solid wood is such that the risk of attack by surface moulds or by staining or wood-destroying fungi is insignificant (that is the wood shall have a moisture content of maximum 20 %1) in any part for practically the whole of its service life). However, attack by wood-boring insects, including termites, is possible although the frequency and importance of the insect risk depends on the geographical region2). 4.2 Use class 2 In this environment the moisture content of solid wood occasionally exceeds 20 %, either in the whole or only in part of the component and thus allows attack by wood-destroying fungi.

NOTE For timbers whose use includes a decorative function, disfigurement can also occur as a result of the growth of surface moulds and staining fungi.

Risk of inse
...

Questions, Comments and Discussion

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