SIST EN 335:2013
(Main)Durability of wood and wood- based products - Use classes: definitions, application to solid wood and wood based panels
Durability of wood and wood- based products - Use classes: definitions, application to solid wood and wood based panels
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 Holzwerkstoffen
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 panneaux 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
Overview
EN 335:2013 - a CEN European Standard - defines five use classes for the exposure of solid wood and wood‑based products to different service situations. Applicable to solid timber and wood‑based panels (LVL, plywood, OSB, particleboard, fibreboard, modified wood, etc.), the standard describes the exposure conditions and the biological agents (fungi, beetles, termites, marine borers) relevant to each situation. EN 335 clarifies that a use class is a classification of exposure, not a performance or service‑life rating.
Key topics
- Scope and definitions: Terminology aligned with EN 1001‑2:2005; applies to solid wood and wood‑based products.
- Five use classes (UC):
- UC 1 - Interior, dry: not exposed to weather or wetting; biological attack insignificant.
- UC 2 - Interior or under cover with occasional wetting/condensation.
- UC 3 - Exterior, above ground, exposed to weather; subdivided into:
- UC 3.1 - Limited wetting (dries quickly).
- UC 3.2 - Prolonged wetting (water may accumulate).
- UC 4 - In contact with ground and/or fresh water.
- UC 5 - Permanently or regularly submerged in salt (marine) water.
- Biological agents: Indicates relevant risks - wood‑destroying and disfiguring fungi, wood‑boring insects (Coleoptera), termites (Isoptera), marine borers - and notes geographic variability in insect risk.
- Annexes and guidance:
- Annex A: relationship to EN 1995‑1‑1 (Eurocode 5) service classes.
- Annex B: assignment advice for borderline or complex cases.
- Annex C: detailed information on biological agents.
- Key limitations: Use classes do not prescribe protective measures or expected durability durations.
Applications
EN 335:2013 is used to classify exposure conditions during design, specification, production and procurement. Typical users:
- Architects and structural timber designers - to assess appropriate exposure class and coordinate with Eurocode 5 service classes.
- Manufacturers of timber and wood‑based products - for product labeling and selection of preservative treatments or design measures.
- Specifiers, contractors and building owners - to determine appropriate materials, coatings and installation details based on exposure risk.
- Certification bodies and regulators - for standardised exposure classification in test reports and standards compliance.
Practical value: use classes guide material selection, treatment decisions and maintenance planning by describing the likely service situation and relevant biological risks.
Related standards
- EN 1995‑1‑1 (Eurocode 5) - Service classes for timber design (see Annex A for alignment guidance).
- EN 1001‑2:2005 - Durability terminology and vocabulary.
Keywords: EN 335:2013, use classes, durability of wood, wood‑based products, solid wood, biological agents, timber exposure, Eurocode 5.
Frequently Asked Questions
SIST EN 335:2013 is a standard published by the Slovenian Institute for Standardization (SIST). Its full title is "Durability of wood and wood- based products - Use classes: definitions, application to solid wood and wood based panels". This standard covers: 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.
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.
SIST EN 335:2013 is classified under the following ICS (International Classification for Standards) categories: 71.100.50 - Wood-protecting chemicals; 79.040 - Wood, sawlogs and sawn timber; 79.060.01 - Wood-based panels in general. The ICS classification helps identify the subject area and facilitates finding related standards.
SIST EN 335:2013 has the following relationships with other standards: It is inter standard links to SIST EN 335-3:2002, SIST EN 335-1:2006, SIST EN 335-2:2006. Understanding these relationships helps ensure you are using the most current and applicable version of the standard.
SIST EN 335:2013 is associated with the following European legislation: EU Directives/Regulations: 305/2011, 89/106/EEC. When a standard is cited in the Official Journal of the European Union, products manufactured in conformity with it benefit from a presumption of conformity with the essential requirements of the corresponding EU directive or regulation.
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Standards Content (Sample)
SLOVENSKI STANDARD
01-september-2013
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SIST EN 335-1:2006
SIST EN 335-2:2006
SIST EN 335-3:2002
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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 in
...
La norme SIST EN 335:2013 se révèle être un document essentiel pour la compréhension de la durabilité du bois et des produits dérivés du bois. Son champ d'application est clair et concis, englobant les produits en bois massif ainsi que les panneaux à base de bois. Cette norme européenne définit de manière précise cinq classes d'utilisation, chacune correspondant à différentes situations de service auxquelles le bois et les produits dérivés peuvent être exposés. L'un des points forts de cette norme est sa capacité à identifier les agents biologiques pertinents pour chaque classe d'utilisation. Cela permet aux professionnels du secteur de mieux évaluer les risques liés à l'utilisation du bois dans divers environnements et de mettre en œuvre des mesures appropriées pour garantir la durabilité des produits. Les classifications fournies sont particulièrement pertinentes, car elles aident à orienter les choix de matériaux selon les conditions d'exposition spécifiques. Cependant, il est important de noter que les classes d'utilisation, bien qu'indiquent le type d'environnement auquel les produits en bois seront soumis, ne doivent pas être confondues avec des classes de performance. La norme ne fournit pas d'indications sur la durée de vie des produits en service, ce qui pourrait être un aspect à approfondir pour renforcer son applicabilité et son utilité. En résumé, la norme SIST EN 335:2013 présente des forces indéniables dans la structuration des connaissances autour de la durabilité des produits en bois, mais elle pourrait bénéficier d'un complément d'informations sur les performances pour une utilisation optimale dans des scénarios pratiques. Sa pertinence dans le domaine de la construction et de l'architecture en fait un outil indispensable pour les acteurs concernés.
The SIST EN 335:2013 standard offers a comprehensive framework for understanding the durability of wood and wood-based products through the definition of use classes. Its scope is essential, as it is specifically applicable to both solid wood and wood-based products, making it a vital reference for manufacturers, builders, and consumers alike in the timber industry. One of the significant strengths of this standard is the clear delineation of five use classes that categorize various service situations. This categorization provides users with insights into the environmental conditions that different wood and wood-based products may face, thus informing better choices for specific applications. Additionally, by indicating the relevant biological agents for each use class, the standard enables stakeholders to assess potential risks and take preventive measures accordingly. While SIST EN 335:2013 does not provide a performance class or direct guidance on the longevity of wood products, this focus allows it to concentrate on the classification of use situations rather than performance metrics. This aspect is crucial for ensuring that products are chosen based on their expected exposure rather than unrealistic longevity expectations. The standard is particularly relevant in the current climate where sustainability and material performance are at the forefront of construction practices. By prioritizing appropriate use classes, the standard aids in promoting the responsible use of wood and wood-based products, thereby fostering the longevity and integrity of projects. In essence, SIST EN 335:2013 serves as a fundamental tool for understanding the interplay between wood materials and their intended applications, making it a cornerstone document in the field of wood durability.
SIST EN 335:2013は、木材及び木材ベース製品の耐久性に関する重要なヨーロッパ規格であり、特に固体木材および木材ベースパネルに適用されます。この標準は、木材と木材ベース製品が直面する異なるサービス状況を示す5つの使用クラスを定義しています。 使用クラスは、性能クラスではなく、木材および木材ベース製品がサービス中にどのくらいの期間持つかについての指針を提供するものではありません。これは、ユーザーが材料の適切な使用を理解するために極めて重要です。使用クラスの明確な定義により、適切な用途に対する選択が容易に行えるようになります。また、各サービス状況に関連する生物的要因も示すことで、製品選定の際に考慮すべき重要な情報を提供しています。 この標準の強みは、明確な仕様に基づいており、設計者や施行者が木材を使用する際に必要な基準を理解しやすくする点です。さらに、EU市場における木材の流通において、SIST EN 335:2013は大変重要な役割を果たし、木材及び木材ベース製品の持続可能な利用を促進しています。 このように、SIST EN 335:2013は木材及び木材ベース製品の使用クラスの定義とその適用に関する包括的なガイダンスを提供しており、その適用範囲や定義の整備により、業界全体における標準化と品質向上に寄与しています。
SIST EN 335:2013 표준은 목재 및 목재 제품의 내구성에 대한 중요한 기준을 제공합니다. 이 표준은 솔리드 우드와 목재 기반 패널을 포함한 다양한 목재 및 목재 제품에 적용되며, 총 다섯 가지 사용 클래스를 정의합니다. 각 사용 클래스는 목재 제품이 노출될 수 있는 다양한 서비스 상황을 나타내며, 목재 사용의 적절성을 평가하는 데 도움을 줍니다. 이 표준의 강점 중 하나는 생물학적 요인에 대한 명확한 지침을 제공한다는 점입니다. 각 사용 클래스에 해당하는 생물학적 요인이 무엇인지 상세히 언급되어 있어, 사용자가 특정 환경에서의 목재의 내구성을 올바르게 판단할 수 있도록 돕습니다. 또한, 사용 클래스는 성능 클래스와는 다르며, 이는 목재 제품이 실제로 얼마나 오래 지속될지에 대한 정보를 제공하지 않음을 명확히 합니다. SIST EN 335:2013 표준은 목재 및 목재 기반 제품의 올바른 사용과 관리에 필수적인 기준을 제시함으로써, 산업에서의 안전성과 효율성을 높이는 데 기여합니다. 이러한 표준은 건축 및 가구 산업 등 다양한 분야에서 목재의 활용을 최적화할 수 있는 지침을 제공하며, 목재 제품의 선택과 사용에 대한 신뢰성을 강화하는 데 중요한 역할을 합니다. 따라서, SIST EN 335:2013은 목재 및 목재 기반 제품의 다양한 서비스 상황을 고려한 필수적인 표준으로, 사용자에게 실용적이고 유용한 정보를 제공하는 데 탁월한 가치가 있습니다.
Die SIST EN 335:2013 ist ein bedeutendes Dokument zur Haltbarkeit von Holz und Holzprodukten, das eine wichtige Rolle in der Holzverarbeitung und -anwendung spielt. Diese europäische Norm definiert fünf Nutzungsklassen, die verschiedene Einsatzsituationen darstellen, denen Holz und holzbasierte Produkte ausgesetzt sein können. Die klare Unterscheidung dieser Nutzungsklassen ist besonders relevant, da sie den Anwendern hilft, geeignete Holzprodukte für spezifische Anforderungen auszuwählen. Die Stärken der Norm liegen insbesondere in ihrer umfassenden Definition der biologischen Agenten, die für jede Nutzungsklasse von Bedeutung sind. Dies fördert ein besseres Verständnis für die Umweltbedingungen, die die Haltbarkeit und Lebensdauer von Holzprodukten beeinflussen können. Ein weiterer Vorteil ist, dass die Norm nicht mit Leistungsklassen verwechselt werden sollte. Sie gibt zwar keine konkreten Anhaltspunkte zur erwarteten Lebensdauer der Holz- und Holzprodukte, bietet jedoch eine solide Grundlage zur Risikobewertung in entsprechenden Anwendungsbereichen. Die Relevanz der SIST EN 335:2013 kann nicht hoch genug eingeschätzt werden, da sie eine standardisierte und nachvollziehbare Orientierung für Hersteller, Händler und Anwender von Holzprodukten bietet. Durch die Festlegung der Nutzungsklassen wird sichergestellt, dass Holzprodukte unter den richtigen Bedingungen eingesetzt werden, um ihre Lebensdauer zu maximieren und die Nachhaltigkeit zu fördern. In der heutigen Zeit, in der der verantwortungsvolle Umgang mit natürlichen Ressourcen immer wichtiger wird, ist die Anwendung dieser Norm von zentraler Bedeutung. Insgesamt trägt die SIST EN 335:2013 dazu bei, klare Kriterien für die Auswahl und den Einsatz von Holzprodukten festzulegen, was sowohl ökologische als auch ökonomische Vorteile mit sich bringt.
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