1、June 2013 Translation by DIN-Sprachendienst.English price group 9No part of this translation may be reproduced without prior permission ofDIN Deutsches Institut fr Normung e. V., Berlin. Beuth Verlag GmbH, 10772 Berlin, Germany,has the exclusive right of sale for German Standards (DIN-Normen).ICS 71
2、.100.50; 79.040!%S“2022548www.din.deDDIN EN 335Durability of wood and wood-based products Use classes: definitions, application to solid wood and wood-basedproducts;English version EN 335:2013,English translation of DIN EN 335:2013-06Dauerhaftigkeit von Holz und Holzprodukten Gebrauchsklassen: Defin
3、itionen, Anwendung bei Vollholz und Holzprodukten;Englische Fassung EN 335:2013,Englische bersetzung von DIN EN 335:2013-06Durabilit du bois et des matriaux base de bois Classes demploi: dfinitions, application au bois massif et aux matriaux base de bois;Version anglaise EN 335:2013,Traduction angla
4、ise de DIN EN 335:2013-06SupersedesDIN EN 335-1:2006-10,DIN EN 335-2:2006-10 andDIN EN 335-3:1995-09www.beuth.deDocument comprises 16 pagesIn case of doubt, the German-language original shall be considered authoritative.06.13DIN EN 335:2013-06 2 A comma is used as the decimal marker. National forewo
5、rd This document (EN 335:2013) has been prepared by Technical Committee CEN/TC 38 “Durability of wood and wood-based products” (Secretariat: AFNOR, France). The responsible German body involved in its preparation was the Normenausschuss Holzwirtschaft und Mbel (Timber and Furniture Standards Committ
6、ee), Working Committee NA 042-03-06 AA Spiegelausschuss zu CEN/TC 38 und ISO/TC 165/SC 1 Dauerhaftigkeit von Holz und Holzprodukten. Amendments This standard differs from DIN EN 335-1:2006-10, DIN EN 335-2:2006-10 and DIN EN 335-3:1995-09 as follows: a) the former three parts of EN 335 have been com
7、bined; b) Subclauses 3.1 and 3.2 have been redefined; c) the subdivision of use class 4 has been omitted. Previous editions DIN 68800: 1956-09 DIN 68800-3: 1974-05, 1981-05, 1990-04 DIN EN 68805: 1983-10 DIN EN 335-1: 1992-09,2006-10 DIN EN 335-2: 1992-10,2006-10 DIN EN 335-3: 1995-09 EUROPEAN STAND
8、ARD NORME EUROPENNE EUROPISCHE NORM EN 335 March 2013 ICS 71.100.50; 79.040 Supersedes EN 335-1:2006, EN 335-2:2006, EN 335-3:1995English Version Durability of wood and wood-based products - Use classes: definitions, application to solid wood and wood-based productsDurabilit du bois et des matriaux
9、base de bois - Classes demploi: dfinitions, application au bois massif et aux matriaux base de bois Dauerhaftigkeit von Holz und Holzprodukten - Gebrauchsklassen: Definitionen, Anwendung bei Vollholz und Holzprodukten This European Standard was approved by CEN on 5 February 2013. CEN members are bou
10、nd 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 C
11、EN-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
12、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,
13、Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and United Kingdom. EUROPEAN COMMITTEE FOR STANDARDIZATION COMIT EUROPEN DE NORMALISATION EUROPISCHES KOMITEE FR NORMUNG Management Centre: Avenue Marnix 17, B-1000 Brussels 2013
14、 CEN All rights of exploitation in any form and by any means reserved worldwide for CEN national Members. Ref. No. EN 335:2013: EEN 335:2013 (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 wood and wood-based
15、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
16、(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
17、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 DIN EN 335:2013-06 EN 335:2013 (E) 3 Foreword This document (EN 335:2013) has been prepared by Technical Committee CEN/TC 38 “Durability of wood and wood-based products”, the
18、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. Attent
19、ion 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,
20、 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
21、 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, N
22、etherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and the United Kingdom. DIN EN 335:2013-06 EN 335:2013 (E) 4 Introduction This standard gives general definitions of use classes for different service situations and is relevant to solid wood and wo
23、od-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
24、 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. DIN
25、 EN 335:2013-06 EN 335:2013 (E) 5 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 bio
26、logical 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 indispe
27、nsable 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
28、 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-ba
29、sed 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 wo
30、od 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. Thi
31、s 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 fung
32、i is insignificant and always accidental. DIN EN 335:2013-06 EN 335:2013 (E) 6 Attack by wood-boring insects, including termites, is possible although the frequency and importance of the insect occurrence depends on the geographical region1). 4.3 Use class 2 (UC 2) Situations in which the wood or wo
33、od-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-dest
34、roying fungi is possible. Attack by wood-boring insects, including termites, is possible although the frequency and importance of the insect risk depends on the geographical region1). 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
35、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 insect risk depends on the geographical region1). A large variety of in-use situations ex
36、ists 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
37、 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 t
38、his 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
39、 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. DIN EN 335:2013-06 EN 335:2013 (E) 7 Attack by wood-boring insects, incl
40、uding termites, is possible although the frequency and importance of the insect occurrence depends on the geographical region 1). NOTE Wood and wood-based products which are constantly below water level or completely buried and fully saturated by water are not susceptible to be attacked by fungi but
41、 may be damaged by bacterial decay. 4.6 Use class 5 (UC 5) A situation in which the wood or wood-based product is permanently or regularly submerged in salt water (i.e. sea water and brackish water). Attack by invertebrate marine organisms is the principal problem, particularly in the warmer waters
42、where organisms such as Limnoria spp., Teredo spp. and Pholads can cause significant damage. Attack by wood-destroying fungi and growth of surface moulds and staining fungi is also possible. The above water portion of certain components, for example harbour piles, can be exposed to wood-boring insec
43、ts. DIN EN 335:2013-06 EN 335:2013 (E) 8 4.7 Summary of use classes for wood and wood-based products Table 1 Summary of use classes and relevant attacking biological agents for wood and wood-based products Use class General use situation aOccurrence of biological agents b, cDisfiguring fungi Wood-de
44、stroying fungiBeetles Termites Marine borers 1 Interior, dry - - U L - 2 Interior, or under cover, not exposed to the weather. Possibility of water condensation U UU L - 3 Exterior, above ground, exposed to the weather. When sub-divided: 3.1 limited wetting conditions 3.2 prolonged wetting condition
45、s U U U L - 4 Exterior in ground contact and/or fresh water U U U L - 5 Permanently or regularly submerged in salt water UdUdUdLdU U = ubiquitous in Europe and EU territories L = locally present in Europe and EU territories aBorder line and extreme cases of use of wood and wood-based products exist.
46、 This can cause the assignment of a use class that differs from that defined in this standard (see Annex B). bIt may not be necessary to protect against all biological agents listed as they may not be present or economically significant in all service conditions in all geographic regions, or may not
47、 be able to attack some wood-based products due to the specific constitution of the product. cSee Annex C. dThe above water portion of certain components can be exposed to all of the above biological agents.DIN EN 335:2013-06 EN 335:2013 (E) 9 Annex A (informative) Service classes according to EN 19
48、95-1-1 EN 1995-1-1 defines a set of three service classes which are relevant to a designer when assigning strength values and calculating deformations for timber elements to be used in a construction. These service classes are determined by the wood moisture content corresponding to the humidity and
49、 temperature which are expected to prevail in service. The wood moisture content is also an important factor in biological durability, but the system of service classes in EN 1995-1-1 and the system of use classes in this standard differ in their considerations of the effects of this moisture, and individual classes do not directly align with one another. Table A.1 gives guidance on the possible corresponding use classes for each of the service classes. Service class definitions in EN 1995-1-1 and use class definitions in this standard should b
