CEN/TR 16816:2015

SLOVENSKI STANDARD
01-junij-2015
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End use performance of wood products - Utilisation and improvement of existing
methods to estimate service life
Leistungseigenschaften von Holzprodukten
Performance de fin d'utilisation de produits en bois - Utilisation et amélioration de
méthodes existantes pour améliorer la vie de service
Ta slovenski standard je istoveten z: CEN/TR 16816:2015
ICS:
13.020.60 Življenjski ciklusi izdelkov Product life-cycles
79.020 Postopki v tehnologiji lesa Wood technology processes
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

TECHNICAL REPORT
CEN/TR 16816
RAPPORT TECHNIQUE
TECHNISCHER BERICHT
April 2015
ICS 79.080
English Version
End use performance of wood products - Utilisation and
improvement of existing methods to estimate service life
Performances des produits en bois dans leur emploi - Leistungseigenschaften von Holzprodukten
Utilisation et amélioration des méthodes existantes pour
estimer la durée de vie
This Technical Report was approved by CEN on 21 March 2015. It has been drawn up by the Technical Committee CEN/TC 38.

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

CEN-CENELEC Management Centre: Avenue Marnix 17, B-1000 Brussels
© 2015 CEN All rights of exploitation in any form and by any means reserved Ref. No. CEN/TR 16816:2015 E
worldwide for CEN national Members.

Contents Page
Foreword .3
1 Scope .4
2 Background .4
2.1 General .4
2.2 ISO/TC 59/SC14 “Design life” .4
2.3 CEN/TC 350 Sustainability of Construction Words .5
2.4 CEN/TC 351 Construction Products: Assessment of release of dangerous substances .5
2.5 COST Action E37 sustainability through new technologies for enhanced wood durability .5
2.6 WoodExter project .6
2.7 Design value I for resistance factor depending on material .6
Rd
3 Work in this area continued in the Swedish led project WoodBuild 2008-2013.CEN/TC38
Standards: requirements for efficacy .8
3.1 Preservative treated wood .8
3.2 Naturally durable wood .9
4 Guidance on the determination of end use performance of wood products . 10
5 Guidance on utilization and improvement of existing methods to estimate service life . 11
5.1 General . 11
5.2 Gap analysis of existing standards in TC38 to inform on service life . 11
6 Actions . 30
6.1 General . 30
6.2 WG21 . 30
6.3 WG23 . 31
6.4 WG25 . 31
6.5 WG24 . 31
7 Acknowledgements . 32
Bibliography . 33

Foreword
This document (CEN/TR 16816:2015) has been prepared by Technical Committee CEN/TC 38 “Durability of
wood and wood-based products”, the secretariat of which is held by AFNOR.
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.
1 Scope
The scope of WG28 Performance Classification is expressed in this Technical Report:
Guidance on the determination of end use performance of wood products: utilization and improvement of
existing test methods to estimate service life, in order to give input to the harmonized product standards
dealing with the durability requirement of the CPD and future Regulation (EU) No 305/2011 (The Construction
Products Regulation CPR).
This Technical Report brings together the evaluations and discussions to date that have occurred within
CEN/TC38/WG28 Performance Classification.
This technical report does not address panel products specifically.
2 Background
2.1 General
The development of performance-based design methods for durability requires that models are available to
predict performance in a quantitative and probabilistic format. The relationship between performance during
testing and in service needs to be quantified in statistical terms and the resulting predictive models need to be
calibrated to provide a realistic measure of service life, including a defined acceptable risk of non-conformity.
Service-life prediction or planning is a process for ensuring that, as far as possible, the service life of a
building will equal or exceed its design life, while taking into account (and preferably optimising) its life-cycle
costs (ISO 15686 [1]). For a long time, the international organizations CIB and RILEM have been leading this
development, which has had an impact on standardization work nationally, regionally, and globally through
ISO.
Service-life prediction should be integrated into the design process for constructions, but it is also applicable
to existing buildings and other construction works.
Drivers for establishing service-life planning methodology and routines include the need for building owners to
be able to forecast and control costs throughout the design life of a building or construction. It also influences
the reliability of constructed assets, and hence the health and safety of users.
The construction sector is under pressure to improve its cost effectiveness, quality, energy efficiency and
environmental performance and to reduce the use of non-renewable resources. A key issue for the
competitiveness of wood is the delivery of reliable components of controlled durability with minimum
maintenance needs and life-cycle costs.
The importance of service-life issues is reflected in the Construction Products Directive (CPD) with its six
essential requirements, which should be fulfilled by construction products during a ‘reasonable service life’.
2.2 ISO/TC 59/SC14 “Design life”
The development of performance-based design methods for durability requires that models are available to
predict performance in a quantitative and probabilistic format. The relationship between performance during
testing and in service needs to be quantified in statistical terms and the resulting predictive models need to be
calibrated to provide a realistic measure of service life, including a defined acceptable risk of non-conformity.
Service-life prediction or planning is a process for ensuring that, as far as possible, the service life of a
building will equal or exceed its design life, while taking into account (and preferably optimising) its life-cycle
costs (ISO 15686 [1]). For a long time, the international organisations CIB and RILEM have been leading this
development, which has had an impact on standardization work nationally, regionally, and globally through
ISO.
Service-life prediction should be integrated into the design process for constructions, but it is also applicable
to existing buildings and other construction works.
Drivers for establishing service-life planning methodology and routines include the need for building owners to
be able to forecast and control costs throughout the design life of a building or construction. It also influences
the reliability of constructed assets, and hence the health and safety of users.
The construction sector is under pressure to improve its cost effectiveness, quality, energy efficiency and
environmental performance and to reduce the use of non-renewable resources. A key issue for the
competitiveness of wood is the delivery of reliable components of controlled durability with minimum
maintenance needs and life-cycle costs.
The importance of service-life issues is reflected in the Construction Products Directive (CPD) with its six
essential requirements, which should be fulfilled by construction products during a ‘reasonable service life’.
2.3 CEN/TC 350 Sustainability of Construction Words
CEN/TC 350 is responsible for the development of voluntary horizontal standardized methods for the
assessment of the sustainability aspects of new and existing construction works and for standards for the
environmental product declaration of construction products.
The objective is to ensure that LCA-based data for environmental product declarations are consistent,
comparable, verifiable and scientifically based. Since the life cycle has to be defined, it is essential to include
information on service lives, including reference service lives.
Methods for sustainability assessments should be based on a performance-based approach, and should
cover environmental, social and economic performance.
2.4 CEN/TC 351 Construction Products: Assessment of release of dangerous substances
The work of CEN/TC 351 is directed to the area covered by the Biocidal Products Directive and REACH.
Indicators, criteria and developed standards will have significant influence in the future on the materials
available for construction products and on service-life design options.
2.5 COST Action E37 sustainability through new technologies for enhanced wood durability
The Task Force Performance Classification (TFPC) was established at the COST Action E37 workshop in
Ljubljana in 2004 [2]. Its aim was to outline principles for a performance-based classification of wood
durability, in particular in using the natural durability of untreated wood and for modified wood products,
traditional and non-traditional treatments and non-biocidal measures for wood protection.
The COST Action ended in September 2008, and the TFPC submitted a final report for inclusion in the overall
documentation of the Action [3]. Standards for durability of wood and wood-based products, not least those
produced by CEN/TC 38 Durability of wood and wood-based materials, were of primary interest to the TFPC.
They considered that the present standards could not deliver adequate performance-based data. One goal of
the Task Force was therefore to address the way durability is treated in standardization. It was conceived that
well-founded proposals on amalgamating modern, material-independent methods of service-life prediction and
design with traditional wood assessment methods would be of direct use, e.g. to CEN/TC 38 and the
construction industry.
The TFPC recognized the use of Reference Service Life (RSL) as a basis for estimations of Estimated Service
Life (ESL). The estimates are not necessarily reached by use of the Factor Method as in ISO 15686, but the
basic principle is useful. To develop a range of performance classes, the scientific community must connect
better and cooperate with user groups and stakeholders and define reference products that can be evaluated
under reference service conditions. Test results on any commodities, products and components will then be
compared with agreed RSLs, and this can form the foundation for a range of performance classes. During this
development, existing use classes have to be taken into account and, if necessary, adapted to suit a
forthcoming system for performance classification. As an input to Factor A (Quality of components) in the
Factor Method, it will be necessary to define a range of Resistance Classes to feed into the assessments.
This work is carried forward in CEN/TC 38 WG28 and the WoodExter project.
2.6 WoodExter project
The Wood
...