ZEROCARBONBUILDING

DESIGNSTANDARDVERSION2

July2021

CanadaGreenBuildingCouncil?

8ONE工

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Copyright?CanadaGreenBuildingCouncil(CaGBC),2020.Thesematerialsmaybereproducedinwholeorinpartwithout

chargeorwrittenpermission,providedthatappropriatesourceacknowledgementsaremadeandthatnochangesaremadetothecontents.Allotherrightsarereserved.

Theanalyses/viewsinthesematerialsarethoseofCaGBC,buttheseanalyses/viewsdonotnecessarilyreflectthoseofCaGBC’saffiliatesincludingsupporters,funders,members,andotherparticipantsoranyendorsementbyCaGBC’saffiliates.

Thesematerialsareprovidedonan“asis”basis,andneitherCaGBCnoritsaffiliatesguaranteeanypartsoraspectsofthese

materials.CaGBCanditsaffiliatesarenotliable(eitherdirectlyorindirectly)noracceptanylegalresponsibilityforanyissuesthatmayberelatedtorelyingonthematerials(includinganyconsequencesfromusing/applyingthematerials’contents).

Eachuserissolelyresponsible,attheuser’sownrisk,foranyissuesarisingfromanyuseorapplicationofthematerials’contents.

TRADEMARK

ZeroCarbonBuildingTMisatrademarkoftheCanadaGreenBuildingCouncil(CaGBC).

ZeroCarbonBuilding–DesignStandardVersion2

ISBN:978-0-9813298-4-0

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TABLEOFCONTENTS

INTRODUCTION 7

OVERVIEW 10

Eligibility 11

Scope 12

RequiredDocumentation 12

CARBONREQUIREMENTS 13

EmbodiedCarbon 15

Resources 18

OperationalCarbon 19

DirectEmissions 19

IndirectEmissions 21

Resources 24

AvoidedEmissions 25

AvoidedEmissionsfromExportedGreenPower 25

AvoidedEmissionsfromCarbonOffsets 25

Resources 26

ZeroCarbonTransitionPlan 27

ENERGYREQUIREMENTS 28

ThermalEnergyDemandIntensity 29

Resources 32

EnergyUseIntensity 35

Resources 35

PeakDemand 37

Resources 37

ModellingandDesignConsiderations 39

Airtightness 39

FutureWeather 39

Resources 40

IMPACT&INNOVATIONREQUIREMENTS 41

Resources 42

GLOSSARY 44

ACRONYMS 46

APPENDIXI–RequirementsforBundledGreenPowerProductsthatarenotECOLOGOorGreen-eCertified 47

APPENDIXII–EmbodiedCarbonRequirementsforBaselineBuildings 48

APPENDIXIII–SummaryofAddendaChanges 49

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DEVELOPMENTPROCESS

ANDACKNOWLEDGEMENTS

TheZeroCarbonBuilding–DesignStandardVersion2(ZCB-Designv2)wasproducedthroughextensiveconsultationwithexpertsandstakeholdersacrossthecountryoveratwo-yearperiod.

UpdatestotheStandardweredevelopedusingthefollowingguidingprinciples,establishedbytheZeroCarbonSteeringCommittee:

?Prioritizecarbonemissionsreductions

?Ensureenergyefficientdesign

?Encouragegoodgridcitizenship

?Incentivizereductionsinembodiedcarbon

?Keepitsimpleandaccessible

RevisionstotheStandardwereinformedbytheZeroCarbonPilotProgram,aninitiativedesignedtofacilitatepeerlearningandcapacitybuildingamongstagroupof16projectteamsthatcommittedtothetwo-yearimmersionprogrampriortothelaunchofregistrationfortheZeroCarbonBuildingStandard(ZCBStandard).Thepilotprogramrecognizedexcellenceandleadership,andservedtoinformthedevelopmentoftools,policies,andpathwaystoacceleratemarkettransformation.ThelessonslearnedfromthepilotprogramassistedtheCanadaGreenBuildingCouncil(CaGBC)inidentifyingopportunitiestorefinetheZCBStandard.

In2019,aseriesofzerocarbonroundtableswereheldacrossthecountrytocollectfeedbackontheZCBStandardandto

discussthechallengesandopportunitiesindifferentregionsofthecountry.Threeworkinggroupswerealsoformed,bringingsignificantsubjectmatterexpertisetothedevelopmentprocess.Theworkinggroups–focusedonenergymetrics,carbon

accounting,andembodiedcarbon–reviewedthefeedbackreceivedthroughthepilotprojectsandroundtablesandmade

recommendationstotheZeroCarbonSteeringCommittee.TheSteeringCommitteeworkedwithCaGBCstafftodevelopalistoffinalrecommendations.

CaGBCextendsitsdeepestgratitudetoallourcommitteeandworkinggroupmembers;thepilotprojectteams;participantsinthezerocarbonroundtables,andthemembersofCaGBC’sEnergyandEngineeringTechnicalAdvisoryGroup.WealsowishtoacknowledgethesupportofSteveKemp,RDHBuildingScienceInc.,andChrisMagwood,EndeavorCenter.

CaGBCwishestothankEnvironmentandClimateChangeCanadafortheirfinancialsupport.

Thisprojectwasundertakenwiththefinancialsupportof:

ceprojetatrasavecl'appuifinancierde:

Environmentand

climatechangecanada

Environnementet

changementclimatiquecanada

5CaGBC|ZeroCarbonBuilding–DesignStandardVersion2|July2021

ZEROCARBONSTEERINGCOMMITTEE

DouglasWebber(Chair),PurposeBuilding

ArjunKC,AlbertaEnergy

ChristianCianfrone,ZEBx

CraigApplegath,DIALOG

DarrylNeate,OxfordPropertiesEdCullinan,ATCO

HakimNesreddine,HydroQuebecJagdambaSingh,CadillacFairviewMaeriMachado,WSPCanada

MariaMcGibbon,PublicServicesandProcurementCanadaMaryQuintana,BrockUniversity

MattTokarik,SubterraRenewablesMaximeBoisclair,GBi

MorganMcDonald,LedcorConstructionLtd.

RyanZizzo,Mantle314

SheenaSharp,CoolEarthArchitectureinc.

WendyMacdonald,StantecConsultingLtd.

ENERGYMETRICSWORKINGGROUP

AntoniPaleshi,WSPCanadaChristianCianfrone,ZEBx

CurtHepting,EnersysAnalyticsInc.

ElyseHenderson,RDHBuildingScienceInc.FredericGenest,NRCanCanmetEnergy

LukaMatutinovic,PurposeBuildingMartinRoy,MartinRoy&AssociatesMaximeBoisclair,GBi

MeaghanKahnert,ARUP

SamanthaLane,StantecConsultingLtd.

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EMBODIEDCARBONWORKINGGROUP

Fran?oisCharron-Doucet,GroupeAGéCOJulie-AnneChayer,GroupeAGéCO

GeoffreyGuest,NationalResearchCouncilCanadaJennyMcMinn,UrbanEquation

KaitlynTyschenko,EllisDon/Pomerleau

KevinStelzer,BrockMcIlroy/ENFORMArchitectsMarkLucuik,MorrisonHershfield

MattBowick,AthenaInstitute

PatrickEnright,CityofVancouverRyanZizzo,Mantle314

SandraDedesko,RWDISudhirSuri,L’OEUF

CARBONACCOUNTINGWORKINGGROUP

AdamStoker,UniversityofCalgary

DanielHegg,StantecConsultingLtd.

DouglasWebber,PurposeBuildingFirasAbouKhamis,WSPCanadaHowlanMullally,CityofToronto

KalumGalle,MorrisonHershfield

MariaMottillo,PublicServicesandProcurementCanadaMorganMcDonald,LedcorConstructionLtd.

NatalieKehle,InfrastructureOntario/TownofAurora

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ZEROCARBONPILOTPROJECTS

MohawkCollege–JoyceCentreforPartnership&Innovation

Hamilton,ON

NiMATrailsResidential/CommercialBuilding

Guelph,ON

Curé-PaquinElementarySchool

Saint-Eustache,QC

WilkinsonAvenueWarehouses

Dartmouth,NS

UniversityofCalgary–MacKimmieComplex

Calgary,AB

ArthurMeighenBuilding

Toronto,ON

CityofVancouverFireHall

Vancouver,BC

OkanaganCollege–

HealthSciencesCentre

Kelowna,BC

EcoLock

Kelowna,BC

evolv1

Waterloo,ON

WalkertonClean

WaterCentre

Walkerton,ON

TheStack

Vancouver,BC

TheHUB

Toronto,ON

TRCANew

Headquarters

Toronto,ON

West8thandPine

Vancouver,BC

ConfidentialProject

Winnipeg,MB

Figure1–ZeroCarbonBuildingPilotProjectsinCanada

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INTRODUCTION

AZeroCarbonBuildingisahighly

energyefficientbuildingthatproducesonsite,orprocures,carbon-free

renewableenergyorhigh-quality

carbonoffsetsinanamountsufficient

tooffsettheannualcarbonemissions

associatedwithbuildingmaterialsandoperations.

Toavoidtheworsteffectsofclimatechange,allnationsmustfocuseffortsoncarbonreduction.Asanindustry,buildingconstructionandoperationsmusteffectively

eliminategreenhousegas(GHGs)emissionsby2050.

Toachievethisgoal,newbuildingsbeingplannedtodaymustsetzerocarbonemissionsastheirtarget.Retrofitsofexistingbuildingsmustlikewiseemphasizedeep

emissionsreductions.Thereisnotimetowait.

TheIntergovernmentalPanelonClimateChange(IPCC)

hasfixedtheworld’savailablecarbonbudget–the

maximumamountofGHGsthatcanbereleasedintothe

atmosphereovertime–at420gigatonnes(Gt)ofcarbondioxideequivalent(CO2e).It’satargetdesignedtokeep

globalwarmingto1.5oC.However,attheworld’scurrentrateof40Gtofcarbonemissionsperyear,thatbudgetwilllastalittlemorethan10yearsbeforeweriskatemperatureincreasethatwillsignificantlyalterourclimate.

Tostaywithinthiscarbonbudgetandtomitigatetheeffectsofclimatechangerequiresactionablesolutionstobetaken.EveryyearthatpasseswithoutsignificantlyreducingGHGemissionscontributestotheerosionoftheworld’scarbonbudget,cuttingwhatlittletimewehavelefttoreachzerocarbon.

ThebuildingindustryismobilizingtohelpsupportCanada’seffortstoreducecarbonemissions.Buildingoperationsare

responsiblefor17percentofCanada’scarbonemissions,1withconstructionandmaterialsrepresentingafurther11percent,2providingtheopportunitytomakesignificantcarbonreductionsastheindustrymovestowardtheeliminationofemissionsby

2050.Thisrequiredtransitionisgeneratingnewandinnovativepathwaystozerocarbon,expandingopportunitiesforindustrygrowthandjobcreation.

TheCanadaGreenBuildingCouncil(CaGBC)launchedtheZeroCarbonBuildingStandard(ZCBStandard)toassisttheindustry’stransitiontozerocarbon.CaGBC’sMakingtheCaseforBuildingtoZeroCarbonreportconfirmedthatzerocarbonbuildingsare

technicallyfeasibleandfinanciallyviable.Onaverage,zerocarbonbuildingscanprovideapositivefinancialreturnovera25-yearlife-cycle,inclusiveofcarbonpollutionpricing,andrequireamodestcapitalcostpremium.Thisfinancialreturnwillonlygrowasthecostofcarbonrises,whilezerocarbonbuildingsalsopromisetomitigatefuturecostsforutilitiesandretrofits.3

.

1EnvironmentandClimateChangeCanada.Pan-CanadianFrameworkonCleanGrowthandClimateChange.Canada’sPlantoAddressClimateChangeandGrowtheEconomy(Gatineau,Quebec:EnvironmentandClimateChangeCanada,2016.).

https://www.canada.ca/en/services/environment/weather/climatechange/pan

-canadian-framework/climate-change-plan.html

2GlobalAllianceforBuildingsandConstruction,2019GlobalStatusReportforBuildingsandConstruction(Nairobi:UNEnvironment,2019),12.

3CanadaGreenBuildingCouncil.MakingtheCaseforBuildingtoZeroCarbon(2019).

/MakingTheCase

.

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ZEROCARBONBUILDING–DESIGNSTANDARDV2

TheZeroCarbonBuilding–Design(ZCB-Design)Standardisamade-in-Canadaframeworkfordesigningandretrofitting

buildingstoachievezerocarbon.Zerocarbonbuildingsrepresenttheindustry’sbestopportunityforcost-effectiveemissionsreductionsthatspurinnovationindesign,buildingmaterialsandtechnology,creatingjobsandbusinessopportunities.

TheseconditerationoftheStandardintroducesgreaterrigourwhileincreasingflexibility,tosupportthegoaloftransformingallbuildingstobezerocarbon.TheupdatestotheZCB-DesignStandardaredesignedtofacilitatethischangebyincorporatingthefindingsfromZCBStandardcertifiedprojectsandbyrespondingtoevolvingknowledgethatisshapingoperationalsolutions.

Specialconsiderationwasgiventothefollowingfourtopicareas.

EMBODIEDCARBONINCONSTRUCTIONMATERIALS

Whiletheenergyefficiencyofbuildingshasimprovedandreducedtheemissionsassociatedwithbuildingoperations,therelativeembodiedcarbonassociatedwithbuildingmaterialshasincreased.4Emphasisnowneedstobedirectedatreducingthecarbonassociatedwiththelife-cycleembodiedcarbonofmaterials.Ofparticularimportancearetheemissionsfromtheproductionof

constructionmaterials,whichtheindustrycallsupfrontcarbon.Theseemissionsbecomeafactorevenbeforeabuildingbeginsoperation.

ENERGYGRIDSANDBUILDINGS

Buildingdesignmustnowconsidertheinterplayofdrawingpowerfromthegridandsendingpowerback,toensurethe

exchangesprovidemeasurablecarbonreductions.Forexample,buildingdesignshouldaimtoreduceandshiftpeakelectricitydemandtominimizeconsumptionattimeswhenfossilfuelsarebeingusedtomeetgridpowergenerationneeds.

ONSITERENEWABLES

Onsiterenewablesofferacost-effectivepathtoreducecarbonemissionsfrombuildingslocatedinareaswithhigh-carbon

electricitygrids.Theycanalsobeeffectiveinlow-carbongridsprovidedtheydisplacefossilfuelfiredpowergenerationtypicallyusedtomeetpeakdemand.

NEAR-TERMCLIMATEFORCERS

Refrigerantsandmethanearenear-termclimateforcers–GHGsthatlastashorttimeintheatmospherebuttrapalargeamountofheat.Asaresult,thesenear-termclimateforcersacceleratetheimpactofclimatechange.Increasingly,refrigerantsareusedinheatpumpstoenhanceefficiencyanddrivedowncarbonemissions.Thisnecessitatesabetterunderstandingofrefrigerantoptionsandbest-managementpracticestominimizepotentialrefrigerantleaks.Inaddition,theimpactofunintendedmethanereleasesresultingfromextraction,processinganddistributionissignificantandisnowrecognizedintheIPCCGuidelinesfor

NationalGreenhouseGasInventories.5

4R?ck,M.,Saade,M.,Balouktsi,M.,Rasmussen,F.,Birgisdottir,H.,Frischknecht,R.,Habert,G.,Lützkendorf,T.,andPasser,A.,EmbodiedGHGEmissionsofBuildings–TheHiddenChallengeforE?ectiveClimateChangeMitigation(Amsterdamn:Elsevier,2019),3.

5CalvoBuendia,E.,Tanabe,K.,Kranjc,A.,Baasansuren,J.,Fukuda,M.,NgarizeS.,Osako,A.,Pyrozhenko,Y.,Shermanau,P.andFederici,S.,2019Refinementtothe2006IPCCGuidelinesforNationalGreenhouseGasInventories:Volume2–Energy(Switzerland:IPCC,2019),4.34.

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ENHANCEMENTSTOTHEZCB-DESIGNSTANDARD

Buildingstandardsmustevolvewiththemarketandtakeadvantageofnewideas,newtechnologiesandnewprocesses.WiththeZCB-DesignStandard,focuswasplacedonimprovingrigourwhileincreasingflexibility,aswellasraisingthebaronkeymetrics.TofurthersupporttheeffectivenessandmarketuptakeofZCB-Designthefollowingkeyenhancementsweremade:

1.EmbodiedcarbonandrefrigerantsmustbecarefullyconsideredandoffsetpriortoseekingZCB-Performancecertification.

2.Asetofenergyefficiencycomplianceoptionsensureshigherperformanceandflexibility.

3.Innovationisincented,encouragingtheadoptionofnewapproachesandtechnologieswhileprovidingmoreflexibilitytochoosethemostappropriatestrategiesforeachproject.

Theseenhancementsprovideownersandoperatorsimprovedfinancialreturnsfromdesignsthatminimizecapitalcostsandyieldgreaterenergyefficiencycostsavings.Designteamsbenefitfromtheirdesignandtechnologychoicesbeingrecognized,freeingthemtochoosethestrategiesmostappropriatetoeachproject.

WithZCB-Designv2,achievingazerocarbonbuildingmeanstakingresponsibilityforallthecarbonemissionsoverthebuilding’slife-cycle.Itisanambitiousbutnonethelesscriticalobjective,becausewithinthecontextofaglobalcarbonbudgeteverybitof

carboncounts.

THEFUNDAMENTALSOFGOODDESIGNREMAINUNCHANGED

1.Centraltothesuccessofanydesignprojecttargetingzerocarbonistheapplicationofanintegrateddesignapproach.

2.Emphasisshouldremainfirstonthedualgoalsofminimizingembodiedcarbonandreducingenergy

demand.Improvementstothebuilding’senvelopeandventilationstrategiesnotonlyreduceenergy

demandbutalsoenableheatingsolutionsthatarenotfossilfuel-basedandhelpreducepeakdemandontheelectricitygrid.

3.Meetingabuilding’senergyneedsefficientlyisacriticalnextstepthathelpsreduceenergyuseand

savesonenergycosts.Fromheatingandcoolingtohotwaterandlighting,efficiencyfocusesonmeetingenergyneedswiththeleastenergyandcarbonemissions.

4.Considerationshouldnextbegiventohowabuildingmightgenerateonsiterenewableenergy,

accountingforgridinteractionstoensurerealcarbonreductions.Energystorage,whetherintheformofelectricalorthermalstorage,isbecomingrecognizedasavaluablestrategythathelpsminimizegridimpactswhilereducingoreliminatingtheneedforfossilfuelstomeetpeakheatingdemand.

5.Notallbuildingsareabletoreachzeroemissionoperationsbyrelyingsolelyononsitemeasures,andtheembodiedcarbonofconstructionmaterialscanonlybeoffsetwithmeasuresbeyondthebuildingproperty.Therefore,buildingprojectsshouldconsiderthepotentialforoffsiterenewableenergyandcarbonoffsetsasafinalmeasuretowardsattainingzerocarbon.

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OVERVIEW

TheZeroCarbonBuilding–Design(ZCB-Design)Standardisaframeworkforthedesignoflow-carbon,highlyefficientbuildings,andensuresthebestpotentialtoachievezerocarbononceinoperation.TheStandardrecognizesthattherearemanystrategiesforreducingcarbonemissionsatthedesignandoperatingstages,providingflexibilityforbuildingsacrossCanada–ofallsizes

anduses–toachievecertification.

TheZCB-DesignStandardevaluatescarbonemissionsacrossthebuildinglife-cycle,includingconstructionandoperation.

Certificationisawardedbasedontheproject’sfinaldesign,andteamsareeligibletosubmitforcertificationonceissuedforconstruction(IFC)documentsareready.ProjectsareawardedcertificationonceallrequisitedocumentationisreceivedandareviewbyCaGBCconfirmstherequirementsoftheZCB-DesignStandardhavebeenmet.

Thebestbuildingdesigncannotensurezerocarbonoperations.ZCB-Designcertifiedprojectsdonotearntherighttopostacertificationmarkonthebuildingormakeaclaimofzerocarbon,andcommunicationsabouttheachievementofZCB-DesigncertificationshouldreflecttheexpectationthatoperationswillbeverifiedthroughZCB-Performancecertificationfollowing

buildingoccupancy.

ZCB-Performancecertificationisawardedbasedononeyearofoperatingdata.Itincludes,inthecaseofprojectsthatpreviouslyachievedZCB-Designcertification,verificationofairtightness,andoffsettingoftheembodiedcarbon6ofthestructuraland

envelopematerials.RequirementsareestablishedintheZCB-PerformanceStandard.

ZCB-Designcertificationmaynotbeusedtomakeacarbon-neutralclaimaboutaproductorserviceoriginatingfromaZCB-Designcertifiedbuilding,howeveritmayformpartofastrategytoachievethis.

ZCB-Designv2

One-timecertificationfornewbuildingsandmajorrenovations

Carbon

Zerocarbonbalance

Modelzerocarbonbalance

Achievezerocarbonbalance

Embodiedcarbon

Reportembodiedcarbon

Offsetembodiedcarbon

Refrigerants

Reporttotalquantity

Offsetanyleaks

RECsandcarbonoffsets

Providequote

Provideproofofpurchase

Onsitecombustion

Providetransitionplan

Updateplanevery5years

Energy

Energyefficiency

Meetoneofthreeapproaches

ReportEUI

Peakdemand

Reportseasonalpeaks

Reportseasonalpeaks

Airtightness

Reportandjustifymodelledvalue

Conducttesting

ifZCB-Designv2certified

ImpactandInnovation

Applytwostrategies

Norequirement

ZCB-Performancev2

Annualcertificationforexistingbuildings

Figure2–SummaryofKeyZeroCarbonBuildingRequirements

6TermsinboldappearintheGlossary.

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ELIGIBILITY

TheZCB-DesignStandardappliestoallnewbuildingsexceptsingleandmulti-familyresidentialbuildingsthatfallunderPart9oftheNationalBuildingCode.MajorrenovationstoexistingbuildingsmaypursueZCB-Designcertificationprovidedtheyinclude

HVAC,envelope,and/orinteriorrenovationsthatrequireanewcertificateofoccupancyand/orpreventnormalbuildingoperationsfromoccurringwhiletheyareinprocess.Proposedchangesofusetothebuildingarealsoconsideredmajorrenovations.

ZCB-Designmaybeusedtoevaluatetheefficiencyandlowcarbondesignofentirebuildings,aswellasadditionsandattachedbuildings.Additionsandattachedbuildingswillbesubjecttoadditionalcriteria.ZCB-Designv2projectboundariesmaybe

alignedwithLEEDBuildingDesignandConstruction(BD+C)boundarieshowever,LEEDInteriorDesignandConstruction(ID+C)boundariesmaynotbeused.

ATTACHEDBUILDINGS

AttachedbuildingsmaypursueZCB-Designcertificationprovidedtheyarephysicallydistinctandhaveadistinctidentity.Thefollowingrulesshallapply:

?Attachedbuildingswhicharephysicallyconnectedmustbephysicallydistincttobeconsideredseparateforcertification.

Wherethephysicaldistinctionisunclear,applicantsmustseekclarificationwiththeCanadaGreenBuildingCouncil(CaGBC)byemailingzerocarbon@.

?Attachedbuildingsmusthavedistinctidentity.Thisensuresthatthecertificationiscommunicatedappropriatelytothebuildingusersandthegeneralpublic.Wherethedistinctidentityisunclear,applicantsmustseekclarificationwiththeCanadaGreenBuildingCouncil(CaGBC)byemailingzerocarbon@.

?Buildingsthathavenophysicalconnection,orareconnectedbycorridors,parking,underground,ormechanical/storageroomsareconsideredseparatebuildings.

?Attachedbuildingsgenerallyshareacommonsiteandwillneedtoconsiderappropriateseparationofthatsitetodetermineemissionsourcestoincludeintheproject.

?Attachedbuildingsmusthaveseparateventilationsystemsaswellasenergymeterscapableofmeasuringallenergyuse.

Thisisnecessarytodemonstratecompliancewiththeenergyandcarbonrequirementsofthestandard.

ADDITIONS

NewlyconstructedadditionstobuildingsmaypursueZCB-Designcertificationprovidedtheyaresufficientlyphysicallydistincttopursuecertification.Thefollowingrulesshallapply:

?Additionsmustbephysicallydistinct,representinganewlyconstructed,uniqueareaofabuilding.Thedistinctspacemustalsobereflectedintheprojectnamewhenregistering.

?Additionsmusthaveseparateventilationsystemsaswellasenergymeterscapableofmeasuringallenergyuse.Thisisnecessarytodemonstratecompliancewiththeenergyandcarbonrequirementsofthestandard.

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SCOPE

TheZCB-DesignStandardappliestotheentiretyofthebuildingsiteandincludesallemissionsoutlinedbelow:

?Direct(Scope1)emissionsfromthecombustionoffossilfuels;

?Direct(Scope1)fugitiveemissionsfromtheleakageofrefrigerantsfrombasebuildingHVACsystemswithacapacityof19kWorgreater;

?Indirect(Scope2)emissionsfrompurchasedelectricity,heating,orcooling;and,

?Embodiedcarbon(Scope3)emissionsthatareassociatedwithnewstructuralandenvelopebuildingmaterials.

REQUIREDDOCUMENTATION

ApplicantsmustcompletetheZCB-Designv2WorkbooktodemonstratecompliancewiththeZCB-Designrequirements.7The

ZCB-Designv2Workbookcontainsafulllistofrequiredsupportingdocumentation.ApplicantsshouldusethemostrecentversionoftheZCB-Designv2Workbook;however,theymayopttousetheversionavailableatthetimeofprojectregistrationprovided

thattheemissionfactorsfromthemostrecentversionareapplied.

TheZCB-Designv2EnergyModellingGuidelinesarealsoanimportantresourcethatmustbefollowed.TheguidelinescontainrequirementsspecifictothedevelopmentoftheenergymodelrequiredforZCB-Designcertification.8

7Availableat/zerocarbon.

8Ibid.

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CARBONREQUIREMENTS

TheZCB-DesignStandardrecognizesthattheholisticassessmentofcarbonemissionsisthebestmeasureofprogresstowardsminimizingclimatechangeimpactsfrombuildings.TheZCB-DesignStandardprovidesaframeworkforsuperiorcarbonand

energyperformance.TheintentisthatallbuildingsthatachieveZCB-Designcertificationwillbeequippedtoachievezerocarbonwhenoperational.ApplicantsforZCB-Designcertificationmustquantify,reduce,andoptimizeemissionsacrossthebuilding’sfulllife-cycle,recognizingtheimpactofconstructionmaterialsandbuildingoperations.

Acarbonbalanceofzeroorbetterovera60-yearlife-cyclemustbedemonstratedforZCB-Designcertification.Thecarbonbalanceisthenetemissionsthatresultfromsourcesandsinksofcarbonemissions,calculatedasfollows:

EMBODIEDOPERATIONALAVOIDED

CARBONCARBONEMISSIONS

NET

EMISSIONS

?Upfrontcarbon?Directemissions?Exportedgreen

?UseStage?Indirectemissionspower

EmbodiedCarbon?Carbonoffsets

?EndofLifeCarbon

Figure3–CalculatingaZeroCarbonBalance

Embodiedcarbon,operationalcarbon,andavoidedcarbonemissionsareseparatelyaddressedinthenextthreesections.

Together,embodiedcarbonandoperationalcarbonoverthelifeofthebuildingareknownaswholelifecarbon.

TheZCB-Designv2Workb