Sustainability of construction works - Assessment of environmental performance of buildings - Calculation method

This European Standard specifies the calculation method, based on Life Cycle Assessment (LCA) and other quantified environmental information, to assess the environmental performance of a building, and gives the means for the reporting and communication of the outcome of the assessment. The standard is applicable to new and existing buildings and refurbishment projects.
The standard gives:
- the description of the object of assessment;
- the system boundary that applies at the building level;
- the procedure to be used for the inventory analysis;
- the list of indicators and procedures for the calculations of these indicators;
- the requirements for presentation of the results in reporting and communication;
- and the requirements for the data necessary for the calculation.
The approach to the assessment covers all stages of the building life cycle and is based on data obtained from Environmental Product Declarations (EPD), their "information modules" (prEN 15804) and other information necessary and relevant for carrying out the assessment. The assessment includes all building related construction products, processes and services, used over the life cycle of the building.
The interpretation and value judgments of the results of the assessment are not within the scope of this European Standard.

Nachhaltigkeit von Bauwerken - Bewertung der umweltbezogenen Qualität von Gebäuden - Berechnungsmethode

Diese Europäische Norm stellt eine auf der Ökobilanz (en: Life Cycle Assessment, LCA) und anderen
quantifizierten Umweltdaten basierende Berechnungsmethode zur Bewertung der umweltbezogenen Qualität
eines Gebäudes sowie Hilfsmittel für das Berichtswesen und die Kommunikation des Ergebnisses dieser
Bewertung zur Verfügung. Sie gilt für neue und bereits bestehende Gebäude sowie für Modernisierungen.
Diese Norm enthält:
 die Beschreibung des Zwecks der Bewertung;
 die auf der Gebäudeebene geltende Systemgrenze;
 das bei der Bestandsanalyse anzuwendende Verfahren;
 eine Liste von Indikatoren und Verfahren zur Berechnung dieser Indikatoren;
 die Anforderungen an die Darstellung der Ergebnisse im Berichtswesen und bei der Kommunikation; und
 die Anforderungen an die für die Berechnung benötigten Daten.
Dieser Bewertungsansatz deckt alle Phasen des Gebäudelebenszyklus ab und basiert auf den aus den
entsprechenden Umweltproduktdeklarationen (EPD) entnommenen Daten, ihren „Informationsmodulen“
(EN 15804) und sonstigen Informationen, die für die Ausführung der Bewertung erforderlich und maßgeblich
sind. Die Bewertung schließt sämtliche im Verlauf des gesamten Lebenszyklus des betreffenden Gebäudes
verwendeten gebäudebezogenen Bauprodukte, -prozesse und -dienstleistungen mit ein.
Die Auslegung und Beurteilung der Ergebnisse der Bewertung sind nicht Gegenstand dieser Europäischen
Norm.

Contribution des ouvrages de construction au développement durable - Evaluation de la performance environnementale des bâtiments - Méthode de calcul

La présente norme fournit la méthode de calcul reposant sur l’analyse du cycle de vie (ACV) et d'autres
informations environnementales quantifiées, qui permet d’évaluer la performance environnementale d’un
bâtiment, et indique comment communiquer le résultat de cette évaluation. La norme s'applique aux
bâtiments neufs et aux bâtiments existants, ainsi qu'aux projets de réhabilitation.
La présente norme fournit :
⎯ la description de l’objet de l’évaluation ;
⎯ la frontière du système qui s’applique à l’échelle du bâtiment ;
⎯ la procédure à suivre pour l’analyse de l’inventaire ;
⎯ la liste des indicateurs et des procédures de calcul de ces indicateurs ;
⎯ les exigences relatives à la présentation des résultats dans le cadre de la communication ;
⎯ et les exigences relatives aux données nécessaires pour réaliser le calcul.
La méthode d’évaluation couvre toutes les phases du cycle de vie d’un bâtiment et repose sur les données
obtenues à partir des Déclarations environnementales de produits (DEP), de leurs « modules
d’informations », (prEN 15804) et, le cas échéant, d’autres informations nécessaires en rapport avec
l'évaluation de la performance environnementale du bâtiment. L'évaluation comprend tous les produits de
construction, les processus et les services en rapport avec le bâtiment, sur l’ensemble de son cycle de vie.
NOTE 1 La norme « Utilisation des informations environnementales des déclarations environnementales de produit
(DEP) » servira de guide pour l'application et l'interprétation des DEP, la conduite à tenir en cas d'absence de DEP et
l'application des scénarios. L’interprétation des résultats de l’évaluation et le jugement de valeur de ces résultats n’entrent
pas dans le domaine d’application de la présente norme.
NOTE 2 Les règles de calcul décrites dans la présente norme peuvent être utilisées pour la quantification de tout
indicateur figurant dans la norme de manière collective ou individuelle.

Trajnostnost gradbenih objektov - Vrednotenje učinkov ravnanja z okoljem v stavbah - Računska metoda

Ta evropski standard je namenjen vrednotenju in ocenjevanju različnih možnosti načrtovanja in specifikacij za nove in obstoječe stavbe in projekte obnove.
Standard podaja računsko metodo, ki temelji na oceni življenjskega cikla, za vrednotenje učinkov ravnanja z okoljem v stavbah in podaja sredstva za komunikacijo izida vrednotenja.
Standard podaja:
- opis objekta vrednotenja,
- mejo sistema, ki velja na nivoju stavbe,
- postopek, ki naj se uporablja za analizo inventarja,
- kazalnike in postopke, ki naj se uporabljajo za vrednotenje učinkov,
- zahteve za predstavitev rezultatov
- in zahteve za podatke, ki so potrebni za izračun.
Pristop k vrednotenju zajema vse stopnje življenjskega cikla stavbe in temelji na podatkih, pridobljenih iz okoljskih deklaracij proizvodov (EPD), njihovih »informacijskih modulov«, (prEN 15804) in, kadar je primerno, drugih podatkov, ki se nanašajo na okoljsko učinkovitost stavbe kot celote. Zajema vse gradbene proizvode, postopke in storitve, ki se nanašajo na stavbo, v celotnem življenjskem ciklu stavbe.
Razlaga in vrednotenje rezultatov ocene ne spadata v področje tega standarda.
Opomba: Kazalniki, npr. podnebne spremembe, se lahko razglasijo s sklicevanjem na ta standard, ne da bi podali celoten spisek kazalnikov, pod pogojem, da so vsi kazalniki izračunani v skladu z metodologijo, razvito v tem standardu.

General Information

Status
Published
Publication Date
08-Nov-2011
Current Stage
9092 - Decision on results of review/2YR ENQ - revise - Review Enquiry
Completion Date
16-Apr-2018

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2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.Nachhaltigkeit von Bauwerken - Bestimmung der umweltbezogenen Qualität von Gebäuden - BerechnungsmethodeContribution des ouvrages de construction au développement durable - Evaluation de la performance environnementale des bâtiments - Méthode de calculSustainability of construction works - Assessment of environmental performance of buildings - Calculation method91.040.01Stavbe na splošnoBuildings in general13.020.20Okoljevarstvena ekonomikaEnvironmental economicsICS:Ta slovenski standard je istoveten z:EN 15978:2011SIST EN 15978:2011en,fr,de01-december-2011SIST EN 15978:2011SLOVENSKI

STANDARD
SIST EN 15978:2011
EUROPEAN STANDARD NORME EUROPÉENNE EUROPÄISCHE NORM
EN 15978
November 2011 ICS 91.040.99 English Version

Sustainability of construction works - Assessment of environmental performance of buildings - Calculation method

Contribution des ouvrages de construction au développement durable - Evaluation de la performance environnementale des bâtiments - Méthode de calcul

Nachhaltigkeit von Bauwerken - Bewertung der umweltbezogenen Qualität von Gebäuden - Berechnungsmethode This European Standard was approved by CEN on 13 August 2011.

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, 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 STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION EUROPÄISCHES KOMITEE FÜR NORMUNG
Management Centre:
Avenue Marnix 17,

B-1000 Brussels © 2011 CEN All rights of exploitation in any form and by any means reserved worldwide for CEN national Members. Ref. No. EN 15978:2011: ESIST EN 15978:2011

EN 15978:2011 (E) 2 Contents Page Foreword ..............................................................................................................................................................4Introduction .........................................................................................................................................................51 Scope ......................................................................................................................................................72 Normative references ............................................................................................................................73 Terms and definitions ...........................................................................................................................84 Abbreviations ...................................................................................................................................... 135 The process for setting up the calculations required for the assessment ................................... 146 Purpose of the assessment ............................................................................................................... 167 Specification of the object of assessment ....................................................................................... 167.1 General ................................................................................................................................................. 167.2 Functional equivalent ......................................................................................................................... 177.3 Reference study period ...................................................................................................................... 187.4 System boundary ................................................................................................................................ 197.4.1 General ................................................................................................................................................. 197.4.2 Boundary of the Product Stage (Modules A1 to A3) ....................................................................... 207.4.3 Boundaries of the Construction Process Stage (Modules A4 and A5) ......................................... 207.4.4 Boundaries of the use stage (Modules B1 - B7) .............................................................................. 227.4.5 Boundary of the end of life stage (Modules C1-C4) ........................................................................ 277.4.6 Boundary for the benefits and loads beyond the system boundary (Module D) ......................... 297.5 The building model ............................................................................................................................. 307.5.1 Purpose and information needed ...................................................................................................... 307.5.2 Description of the physical characteristics of the building ........................................................... 308 Scenarios for defining the building life cycle .................................................................................. 318.1 General ................................................................................................................................................. 318.2 Requirements for scenarios .............................................................................................................. 328.3 Time-related characteristics and associated scenarios ................................................................. 328.3.1 General ................................................................................................................................................. 328.3.2 Climate conditions .............................................................................................................................. 328.3.3 Other specific requirements for scenarios ...................................................................................... 328.4 Scenarios for the product stage (Modules A1 to A3) ...................................................................... 338.5 Scenarios for the construction process stage (Modules A4-A5) ................................................... 338.6 Scenarios for Use stage (modules B1 to B7) ................................................................................... 338.6.1 General ................................................................................................................................................. 338.6.2 Scenario related to use stage (except energy and water) - Module B1 ......................................... 348.6.3 Scenarios for maintenance, repair, replacement - Module B2, B3 and B4 ................................... 348.6.4 Scenarios for refurbishment - Module B5 ........................................................................................ 348.6.5 Scenarios for operational energy use - Module B6 ......................................................................... 358.6.6 Scenarios for operational water use (Module B7) ........................................................................... 358.7 Scenarios for the end of life stage (Modules C1 to C4) .................................................................. 358.7.1 General ................................................................................................................................................. 358.7.2 Scenarios for deconstruction - Module C1 ...................................................................................... 358.7.3 Scenarios for transport - Module C2................................................................................................. 368.7.4 Scenarios for waste processing for reuse, recycling and energy recovery - Module C3 ........... 368.7.5 Scenarios for disposal - Module C4 .................................................................................................. 368.8 Scenarios for benefits and loads beyond the system boundary - Module D ............................... 369 Quantification of the building and its life cycle ............................................................................... 369.1 General ................................................................................................................................................. 36SIST EN 15978:2011

EN 15978:2011 (E) 3 9.2 Specification net amount .................................................................................................................... 369.3 Accounting for the gross amount ...................................................................................................... 369.3.1 General ................................................................................................................................................. 369.3.2 Components that will not be replaced under defined conditions .................................................. 379.3.3 Replaceable components and number of replacements ................................................................. 379.4 Type of data for the assessment ....................................................................................................... 389.4.1 General ................................................................................................................................................. 389.4.2 Data quality and demands for completeness ................................................................................... 399.4.3 Criteria for the exclusion of inputs and outputs .............................................................................. 399.5 Quantification specific to operational energy use ........................................................................... 399.6 Quantification specific to operational water use ............................................................................. 4010 Selection of environmental data and other information - Use of Environmental Product Declaration(s) ....................................................................................................................................... 4010.1 General ................................................................................................................................................. 4010.2 Scenarios for the building .................................................................................................................. 4110.2.1 General ................................................................................................................................................. 4110.2.2 Adaptation of cradle to gate (product stage) information ............................................................... 4110.2.3 Adaptation from gate to grave information (Modules A4 to C4) and Module D ............................ 4110.3 Data quality .......................................................................................................................................... 4210.4 Consistency ......................................................................................................................................... 4211 Calculation of the environmental indicators .................................................................................... 4211.1 Environmental impacts and aspects and related indicators .......................................................... 4211.1.1 General ................................................................................................................................................. 4211.1.2 Indicators describing environmental impacts .................................................................................. 4311.1.3 Indicators describing resource use ................................................................................................... 4311.1.4 Indicators describing additional environmental information ......................................................... 4411.2 Calculation methods ........................................................................................................................... 4412 Reporting of the assessment of results ............................................................................................ 4612.1 General information on the assessment ........................................................................................... 4612.2 General information on the object of assessment ........................................................................... 4612.3 Statement of boundaries and scenarios used in the assessment ................................................. 4712.4 Data sources ........................................................................................................................................ 4712.5 List of indicators used for assessment and expression of results ................................................ 4712.6 Communication of assessment results ............................................................................................ 5113 Verification of results .......................................................................................................................... 52Annex A (informative)

Building description ................................................................................................... 53Annex B (informative)

Exported energy - Case studies ................................................................................ 55B.1 General ................................................................................................................................................. 55B.2 Case 1 ................................................................................................................................................... 55B.3 Case 2 ................................................................................................................................................... 56B.4 Case 3 ................................................................................................................................................... 57B.5 Case 4 ................................................................................................................................................... 58Bibliography ...................................................................................................................................................... 60 SIST EN 15978:2011

EN 15978:2011 (E) 4 Foreword This document (EN 15978:2011) has been prepared by Technical Committee CEN/TC 350 “Sustainability of construction works”, 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 May 2012, and conflicting national standards shall be withdrawn at the latest by May 2012. 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. According to the CEN/CENELEC Internal Regulations, the national standards organizations of the following countries are bound to implement this European Standard: Austria, Belgium, Bulgaria, Croatia, 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 the United Kingdom. SIST EN 15978:2011

EN 15978:2011 (E) 5 Introduction The purpose of this European Standard is to provide calculation rules for the assessment of the environmental performance of new and existing buildings.

This European Standard is part of a suite of European Standards, Technical Specifications and Technical Reports for the assessment of the environmental performance of buildings that together support quantification of the contribution of the assessed building to sustainable construction and sustainable development. The environmental performance of a building is only one aspect of its sustainability. The social and economic performance of the building are also aspects of sustainability that should be assessed as part of a sustainability assessment. These are described in the framework standards (EN 15643-1, -2, and

EN 15643-3, -4). NOTE The environmental assessment at building level requires information from products and services

(EN 15804). The evaluation of technical and functional performance is beyond the scope of this European Standard. Technical and functional characteristics are taken into account here by reference to the functional equivalent, which also forms a basis for comparison of the results of assessments. This European Standard is intended to support the decision-making process and documentation of the assessment of the environmental performance of a building. Although the assessment results are based on realistic scenarios, they may not fully reflect the actual and future performance of the building. Figure 1 illustrates how the assessment of the environmental performance takes place within the concept of the sustainability assessment of buildings.

Figure 1 — Concept of sustainability assessment of buildings SIST EN 15978:2011

EN 15978:2011 (E) 6 In this European Standard, the assessment method for the quantitative evaluation of the environmental performance of the building is based on a life cycle approach. The general requirements for sustainability assessment of buildings are described in EN 15643-1 (the general framework standard). Other requirements for the assessment of environmental performance are given in EN 15643-2. Other standards developed by CEN/TC 350 in this area, and how they are related to this European Standard, are shown in Figure 2.

Figure 2 — Work program of CEN/TC 350 NOTE The grey boxes represent the work programme as presented in EN 15643-1. SIST EN 15978:2011

EN 15978:2011 (E) 7 1 Scope This European Standard specifies the calculation method, based on Life Cycle Assessment (LCA) and other quantified environmental information, to assess the environmental performance of a building, and gives the means for the reporting and communication of the outcome of the assessment. The standard is applicable to new and existing buildings and refurbishment projects. The standard gives:  the description of the object of assessment;  the system boundary that applies at the building level;  the procedure to be used for the inventory analysis;  the list of indicators and procedures for the calculations of these indicators;  the requirements for presentation of the results in reporting and communication;  and the requirements for the data necessary for the calculation. The approach to the assessment covers all stages of the building life cycle and is based on data obtained from Environmental Product Declarations (EPD), their "information modules" (EN 15804) and other information necessary and relevant for carrying out the assessment. The assessment includes all building related construction products, processes and services, used over the life cycle of the building. The interpretation and value judgments of the results of the assessment are not within the scope of this European Standard. 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. EN 15603, Energy Performance of Buildings — Overall energy use and definition of energy ratings EN 15643-1, Sustainability of construction works — Sustainability assessment of buildings — Part 1 General Framework EN 15643-2, Sustainability of construction works - Assessment of buildings - Part 2: Framework for the assessment of environmental performance EN 15643-3, Sustainability of construction works - Assessment of buildings - Part 3: Framework for the assessment of social performance EN 15643-4, Sustainability of construction works - Assessment of buildings - Part 4: Framework for the assessment of economic performance EN 15804, Sustainability of construction works - Environmental product declarations - Core rules for the product category of construction products ISO 15392, Sustainability in Building Construction - General Principles ISO 15686-1:2010, Building and constructed assets — Service life planning — Part 1: General principles SIST EN 15978:2011

EN 15978:2011 (E) 8 ISO 15686-2, Building and constructed assets — Service life planning — Part 2: Service life prediction procedures ISO 15686-7, Building and constructed assets — Service life planning — Part 7: Performance evaluation for feedback of service life data from practice ISO 15686-8, Building and constructed assets — Service life planning — Part 8: Reference service life and service-life estimation 3 Terms and definitions For the purposes of this document, the following terms and definitions apply. 3.1 building construction works that have the provision of shelter for its occupants or contents as one of its main purposes and are usually enclosed and designed to stand permanently in one place [ISO 6707-1:2004] 3.2 building fabric all construction products that are fixed to the building in a permanent manner, so that the dismantling of the product changes the performance of the building and the dismantling or replacement of the product constitute construction operations 3.3 building-integrated technical system installed technical equipment to support the operation of a building NOTE This includes the technical building system and other systems e.g. for sanitation, security, fire safety, internal transport and building automation and control and IT communications, climate control systems and installations. 3.4 building site specified area of land where a building is located or is defined to be located and construction work of the building and associated external works are or will be undertaken NOTE Adapted from the definition of site in ISO 6707-1. 3.5 component construction product (3.6) manufactured as a distinct unit to serve a specific function or functions [ISO 6707-1:2004] 3.6 construction product item manufactured or processed for incorporation in construction works 3.7 construction work activities of forming a construction works (3.8) [ISO 6707-1:2004] SIST EN 15978:2011

EN 15978:2011 (E) 9 3.8 construction works everything that is constructed or results from construction operations NOTE 1 This covers both building and civil engineering works, and both structural and non-structural elements. NOTE 2 Adapted from the definition in ISO 6707-1. 3.9 design life service life intended by the designer [ISO 15686-1:2000] 3.10 environmental aspect aspect of construction works, part of works, processes or services related to their life cycle that can cause change to the environment NOTE 1 Examples for environmental aspects are: use of energy and mass flow, production and segregation of wastes, water use, land use, emissions to air. NOTE 2 The examples added to the definition of environmental aspect in ISO 15392. [ISO 21931-1:2010] [EN 15643-1:2010] 3.11 environmental impact change to the environment, whether adverse or beneficial, wholly or partially, resulting from environmental aspects NOTE Derived from the definitions of impact and environmental impact in ISO 15392. [ISO 21931-1:2010] 3.12 environmental performance performance related to environmental impacts and environmental aspects [ISO 15392:2008] 3.13 estimated service life service life that a building or an assembled system (part of works) would be expected to have in a set of specific in-use conditions, determined from reference service life data after taking into account any differences from the reference in use conditions [EN 15643-1:2010] 3.14 functional equivalent quantified functional requirements and/or technical requirements for a building or an assembled system (part of works) for use as a basis for comparison NOTE Adapted from the definition in ISO 21931-1:2010. SIST EN 15978:2011

EN 15978:2011 (E) 10 3.15 functional performance performance related to the functionality of the construction works or an assembled system (part of works), which is required by the client and/or by users and/or by regulations NOTE Adapted from the definition in EN 15643-1:2010. 3.16 functional requirement type and level of functionality of a building or assembled system which is required by the client and/or by users and/or by regulations NOTE Adapted from the definition in EN 15643-1:2010. 3.17 functionality suitability or usefulness for a specific purpose or activity [EN 15643-1:2010] 3.18 indicator quantifiable value related to environmental impacts/aspects [EN ISO 14044:2006] 3.19 life cycle consecutive and interlinked stages in the life of the object under consideration [EN 15643-1:2010] 3.20 maintenance combination of all technical and associated administrative actions during the service life to retain a building or an assembled system (part of works) in a state in which it can perform its required functions NOTE Adapted from the definition in ISO 15686-1, ISO 6707-1 and in CPD Guidance Paper F. [EN 15643-1:2010] 3.21 operational energy use energy use of the building-integrated technical systems during use and operation of the building NOTE Adapted from the definition in EN 15643-1:2010. 3.22 operational water use water use of the building-integrated technical systems and of the user, as needed for the technically and functionally defined operation of the building NOTE Adapted from the definition in EN 15643-1:2010. 3.23 recovery waste treatment operation that serves a purpose in replacing other resources or prepares waste for such a use SIST EN 15978:2011

EN 15978:2011 (E) 11 NOTE Adapted from the definition in Directive 2008/98. [EN 15643-1:2010] 3.24 recycling any recovery operation by which waste materials are reprocessed into products, materials or substances either for the original purpose or other purposes NOTE 1 Recycling operations include:  recycling of organic substances;  recycling of metals;  recycling of other inorganic materials; as defined in Directive 2008/98 Annex II. NOTE 2 Recycling does not include energy recovery and the reprocessing into materials that are to be used as fuels or for backfilling operations or other recovery operations as defined in Directive 2008/98 Annex II. NOTE 3 Adapted from [EN 15643-1:2010]. 3.25 reference study period period over which the time-dependent characteristics of the object of assessment are analysed NOTE In some cases, the reference study period may differ significantly from the design life of the building. 3.26 refurbishment modification and improvements to an existing building in order to bring it up to an acceptable condition [ISO 6707-1:2004] [EN 15643-1:2010] 3.27 renewable resource resource that is grown, naturally replenished or naturally cleansed, on a human time scale NOTE A renewable resource is capable of being exhausted, but may last indefinitely with proper stewardship. Examples include; trees in forests, grasses in grassland and fertile soil. [ISO 21930:2007] [EN 15643-1:2010] 3.28 repair returning an item to an acceptable condition through the renewal, replacement or mending of worn, damaged or degraded parts [ISO 6707-1:2004] [EN 15643-1:2010] SIST EN 15978:2011

EN 15978:2011 (E) 12 3.29 required service life service life required by the client or through regulations [EN 15643-1:2010] 3.30 re-use any operation through which products or components that are not waste are used again for the same purpose for which they were conceived or used for other purposes without reprocessing NOTE Adapted from the definition in Directive 2008/98. [EN 15643-1:2010] 3.31 scenario collection of assumptions and information concerning an expected sequence of possible future events [EN 15643-1:2010] 3.32 secondary material any material recovered from a previous use or from waste which substitutes primary materials NOTE 1 Secondary material is measured at the point where the secondary material enters the system from another system. NOTE 2 Materials recovered from previous use or from waste from one product system and used as an input in another product system are secondary materials. NOTE 3 Examples of secondary materials (to be measured at the system boundary) are recycled metal, crushed concrete, glass cullet, recycled wood chips, recycled plastic. [EN 15643-1:2010] 3.33 service life working life period of time after installation during which a building or an assembled system (part of works) meets or exceeds the technical requirements and functional requirements NOTE Adapted from the definition in ISO/DIS 15686-1:2008. [EN 15643-1:2010] 3.34 system boundary interface in the assessment between a building and its surroundings or other product systems NOTE 1 System boundary defines what is inclu

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