SIST EN 15228:2009

Structural timber - Structural timber preservative treated against biological attack

This European Standard specifies general requirements for structural timber that has been treated with preservatives against biological attack.
This European Standard also specifies requirements for the evaluation of conformity and marking of preservative treated timber products when they are placed on the market.
Treatments, which include a biocide, are covered by this standard.
It does not provide details of which preservative treatments are necessary for a particular type of structural timber product to achieve a required service life, as regional climatic differences and prevalent biological agents would need to be taken into account for that purpose.
This European Standard does not cover any subsequent treatment which may be required for structural timber products which have been machined, bored or planed after the CE marking has been applied.
This standard does not cover the qualification of preservation products used to treat structural timber.

Bauholz - Bauholz für tragende Zwecke mit Schutzmittelbehandlung gegen biologischen Befall

Diese Europäische Norm legt allgemeine Anforderungen an Bauholz für tragende Zwecke, das mit Holzschutzmitteln
gegen biologischen Befall behandelt wurde, fest.
Ferner legt diese Europäische Norm Anforderungen an die Konformitätsbewertung und Kennzeichnung von
Holzprodukten fest, die mit Holzschutzmitteln gegen biologischen Befall behandelt wurden, und auf den Markt
gebracht werden sollen.
Diese Norm behandelt Schutzmittelbehandlungen.
Sie enthält keine Einzelheiten, welche Schutzmittelbehandlungen für eine besondere Art von Bauholzprodukten
zum Erzielen einer festgelegten Nutzungsdauer erforderlich sind, da dazu die unterschiedlichen
regionalen klimatischen Bedingungen und die jeweils vorherrschenden Schädlinge berücksichtigt werden
müssten.
Diese Europäische Norm behandelt nicht Nachbehandlungen, die für Bauholzprodukte erforderlich sein
können, wenn diese bearbeitet, mit Bohrungen versehen oder gehobelt wurden, nachdem die CE-Kennzeichnung
aufgebracht wurde.
Diese Norm gilt nicht für die Qualifizierung der für die Bauholzprodukte angewendeten Holzschutzmittel.

Bois de structure - Bois de structure traité avec un produit de préservation contre les attaques biologiques

La présente norme européenne spécifie les exigences générales relatives au bois de structure qui a été traité
par des produits de préservation contre les attaques biologiques.
La présente norme européenne spécifie également les exigences relatives à la conformité et au marquage
des produits en bois traités avec un produit de préservation, lorsque ceux-ci sont placés sur le marché.
Les traitements incluant un produit biocide sont couverts par la présente norme.
Elle ne donne pas de détails sur quels traitements de préservation sont nécessaires pour une type particulier
de produit de structure en bois pour atteindre une durée de vie en service prescrite, dans la mesure où les
différences climatiques régionales et les agents biologiques dominants doivent être pris en compte pour
atteindre cet objectif.
La présente norme européenne ne couvre pas les traitements complémentaires pouvant être requis pour des
produits de structure en bois ayant été usinés, mortaisés ou rabotés après application du marquage CE .
La présente norme européenne ne couvre pas la qualification des produits de traitement utilisés pour traiter le
bois de structure.

Konstrukcijski les - Konstrukcijski les, zaščiten pred biološkimi vplivi

General Information

• Status: Published
• Publication Date: 09-Jun-2009
• ICS: 79.040 - Wood, sawlogs and sawn timber
• Technical Committee: KON - Structures
• Current Stage: 6060 - National Implementation/Publication (Adopted Project)
• Start Date: 25-Mar-2009
• Due Date: 30-May-2009
• Completion Date: 10-Jun-2009
• Directive: 305/2011 - Regulation (eu) No 305/2011 of the European Parliament and of the Council of 9 march 2011 laying down harmonised conditions for the marketing of construction products and repealing council directive 89/106/eec
• Directive: 89/106/EEC - Construction products
• Mandate: M/112 - Mandate to CEN/CENELEC concerning the execution of standardization work for harmonized standards on structural timber products
• Ref Project: EN 15228:2009 - Structural timber - Structural timber preservative treated against biological attack

Overview

SIST EN 15228:2009 is a European Standard developed by CEN that sets general requirements for structural timber treated with preservatives to protect against biological attack. This standard covers timber used in load-bearing applications where durability against biological degradation, such as fungi, insects, and other organisms, is essential. It specifies criteria for treatment penetration and retention, conformity evaluation, and marking requirements, ensuring treated timber products placed on the market meet consistent safety and performance standards.

Preservative treatments referenced in SIST EN 15228:2009 include those containing biocides designed to extend the service life of structural timber. However, the standard does not prescribe specific treatments for individual timber types or climatic conditions. Additionally, it excludes processes applied after CE marking such as machining or boring, as well as the qualification of the preservation products themselves.

Key Topics

• Timber Requirements: Treated timber must comply with strength grading standards, particularly EN 14081-1, to ensure suitability for structural use.
• Treatment Penetration and Retention: The depth of preservative penetration and its retention level must be declared and conform to penetration classes defined in EN 351-1. The minimum preservation retention is determined by national regulations or hazard class per EN 599-1.
• Reaction to Fire: Treatment impact on timber’s fire performance is assessed, with products adding more than 2% organic material by mass requiring fire reaction classification according to EN 13501-1. Testing methods and mounting procedures according to EN 13823 are specified.
• Mechanical Properties: The standard prescribes procedures to ensure that preservative treatments do not adversely affect timber’s strength and stiffness. For treatments potentially influencing mechanical properties, comparative testing between treated and untreated samples must be performed.
• Dangerous Substances: Limits on hazardous chemicals such as pentachlorophenol (PCP) are set, with testing required if PCP is used. Marking must clearly indicate if PCP content exceeds established thresholds. Other biocidal substances are subject to consideration under relevant EU directives.
• Conformity Evaluation: Compliance is demonstrated through initial type testing and factory production control. Testing includes verification of treatment penetration, retention, reaction to fire, and mechanical properties following accredited procedures.

Applications

SIST EN 15228:2009 is essential for producers, suppliers, and specifiers of preservative treated structural timber used in construction and civil engineering projects across Europe. Its application ensures that treated timber products:

• Deliver enhanced durability against biological degradation, prolonging structural life.
• Comply with EU market requirements including safety, environmental, and performance regulations.
• Can be reliably identified and traced through standardized marking.
• Will meet fire reaction classifications critical for building safety codes.
• Maintain necessary mechanical performance for structural applications.

Typical uses include timber beams, joists, rafters, and other load-bearing components exposed to conditions conducive to biological attack, such as outdoor environments or areas with high humidity.

Related Standards

SIST EN 15228:2009 references and complements several other European standards essential for treated structural timber performance and evaluation:

• EN 14081-1 – Strength grading of structural timber with rectangular cross-section.
• EN 351-1 & EN 351-2 – Classification of preservative penetration and retention; sampling methods.
• EN 599-1 – Specifications for wood preservatives aligned with hazard classes.
• EN 13501-1 & EN 13823 – Fire classification and testing protocols.
• EN 408 & EN 384 – Test methods for mechanical properties of timber.
• CEN/TR 14823 – Analytical methods for determination of pentachlorophenol content.
• ISO 9001 – Relevant for factory production control quality management.

Together, these standards provide a framework ensuring treated structural timber is fit for purpose, safe, and compliant with regulatory demands.

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Keywords: SIST EN 15228:2009, structural timber, preservative treated timber, biological attack protection, timber preservation, timber durability, CEN standard, timber fire reaction, preservative retention, timber strength and stiffness, pentachlorophenol limits, conformity evaluation, timber treatment marking, European timber standards.

Standards Content (Sample)

2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.Bauholz - Bauholz für tragende Zwecke mit Schutzmittelbehandlung gegen biologischen BefallBois de structure - Bois de structure traité avec un produit de préservation contre les attaques biologiquesStructural timber - Structural timber preservative treated against biological attack79.040Les, hlodovina in žagan lesWood, sawlogs and sawn timberICS:Ta slovenski standard je istoveten z:EN 15228:2009SIST EN 15228:2009en,fr,de01-julij-2009SIST EN 15228:2009SLOVENSKI
STANDARD
EUROPEAN STANDARDNORME EUROPÉENNEEUROPÄISCHE NORMEN 15228March 2009ICS 71.100.50; 79.040 English VersionStructural timber - Structural timber preservative treated againstbiological attackBois de structure - Bois de structure traité avec un produitde préservation contre les attaques biologiquesBauholz - Bauholz für tragende Zwecke mitSchutzmittelbehandlung gegen biologischen BefallThis European Standard was approved by CEN on 7 February 2009.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 CEN 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 translationunder the responsibility of a CEN member into its own language and notified to the CEN Management Centre has the same status as theofficial versions.CEN members are the national standards bodies of Austria, Belgium, Bulgaria, 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:
Avenue Marnix 17,
B-1000 Brussels© 2009 CENAll rights of exploitation in any form and by any means reservedworldwide for CEN national Members.Ref. No. EN 15228:2009: ESIST EN 15228:2009

Preservative treatment not affecting
strength and stiffness properties of treated timber . 11 A.1 General . 11 A.2 Preservatives types . 11 Bibliography . 12
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