an introduction to part l 2010rwiumbraco-gb.inforce.dk/media/114431/part_l_brief.pdf · 6 | an...

An introduction to Part L 2010

Straight talking solutions

December 2010

Contents

Section 1 – The Approved Document 03-07

• Introductiontochanges

• RoadtoZeroCarbon

• ImplementationandtransitionalPeriod

• SustainabilityRoadmap

• Documentstructure

• Responsibilityforcompliance

• TheoreticalbuildingperformancevsActualbuildingPerformance

• SummaryofMainChangestoPartL(2010)

• U-ValueCompetency

• Influentialdesignprincipals

Section 2 – New Build Dwellings (ADL1A) 08-13

• NewDwellings

•Methodofcompliance-SAP2009 (adoptingthe“Flat”Approach)

• Newbuilddwelling:U-valueguide

•MainchangestoSAP2009 (NewBuildDwellings(ADL1A))

• NewDwellingCasestudies

• SolutionsthatmeetPARTL1A- withoutrenewableenergygeneration

• PartyWallBypass

• Reducingheatlossfrompartywalls

• AcousticSolutions

Section 3 – L2A – New Builds OTHER 14-15 than dwellings (ADL2A)

•Methodofcompliance

• AirPressuretesting

• NewBuildNonDwellingsU-valueGuide

• Improvedrainnoiseperformanceusing roofing solutions

Section 4 – Work on Existing Buildings 16-17Dwellings (ADL1B) & Non-dwellings (ADL2B)

• Scopeofworkscovered

• ElementalU-valuesforExtensionwork

• Upgradingretainedthermalelements &Refurbishinginexistingbuildings (Dwellings&Nondwellings)

Section 5 – New Build guide solutions 18-23

• ExternalwallconstructiontoachieveaU-value of 0.25 W/m2k

• RoofconstructiontoachieveU-valuesof0.16 or 0.13 W/m2k

•MinimisingColdBridging-Extensions&NewBuildings

• ExternalwallconstructiontoachieveU-values of 0.28 W/m2k

• RoofconstructiontoachieveU-values of 0.16 or 0.18 W/m2k

Section 6 – Insulating Pipes and Ducts 24-25

• ThePartLsecond-tierdocumentsforpipeandductinsulation

• Domesticheatingcomplianceguide

•Minimumprovision

• Non-domesticheating,coolingandventilationcomplianceguide

• Pipeworkandductinsulation

Section 7 – BuidDesk Part L 2010 Solutions 26

Section 8 – About Rockwool 27

• Sustainability

• ContinuingProfessionalDevelopment(CPD)

• Technicalsupport

Straight talking solutions | 3

Section 1 – The Approved Document L

Sec

tio

n 1

OneofthekeyfeaturesofPartL2010isadrivetoclosethegapbetweentheperformanceanticipatedatdesignstageandwhatisactuallyachieved.Thesenewmeasureswillassistindeliveringrealcarbonsavingswithoutcreatingobstaclesforhousebuildersduringtheeconomicrecovery.

Itisclearthenewamendmentswillstillenablebuildersanddesignerstoachievecompliancethroughtheefficiencyofthebuildingfabricalone,whilstatthesametimeensuringthatmoreefficient,air-tighthomesandotherbuildingsaresufficientlyventilated.ToensureadequatemeansofventilationisprovidedtheApprovedDocumentFhasalsobeenrevised,andwasimplementedatthesametimeasPartL.

Road to Zero Carbon

ThenewpartLwillnotonlyassistincuttingCO2 emissionsbutalsoplayacrucialpartinachievinggovernmentszerocarbonpolicies.

Proposedgovernmenttimescalesforfuturechangestoenergyefficiencystandards• 2013>a44%reductioninCO2 emissions (CodeLevel4)• 2016>Zero-carbonhomes(CodeLevel6)• 2019>Zero-carbon(non-domesticbuildings)

TheUKisalsothefirstcountrytoconfirmlegislationtorequireallnewhomestobezerocarbonfrom2016,withall“otherbuildings”tomeetthestandardfrom 2019.

Sustainability Road map

Implementation and transitional Period

ThenewPartLandF2010documentsbecameenforceableonthe1stOctober2010.ThenewApprovedDocumentsstillcontaintransitionalprovisionsthatallowbuildingworktobecompletedafterthisdatewhichconformwiththerequirements ofPartsL&F2006.

Thistransitionalperiodwouldapplytofollowing:• Existingworkwhichhadalreadystartedbefore 1stOctober2010andwhereabuildingnotice orfullplanshadbeendepositedwiththeBuilding ControlBody(BCB)• Newbuild,whereabuildingnoticeorfullplans hadbeendepositedwiththeBCBbefore1st October2010andworktohavestartedonsite before 1st October 2011.

Introduction to the changes

Thenewstandardsshoulddelivera25%reduction incarbonemissionsfromnewbuildingsrelativeto thestandardssetinthe2006PartL(equivalenttoCodeLevel3CodeforSustainableHomes(CsSH)).Thenewstandardswillmakenewhomesandnon-dwellingsmoreenergyefficient,typicallysavinghouseholders£100ayearontheirheatingbillsandaround2milliontonnesofcarbonsavedeveryyearby2020.

2007 2008 2010 2013 2016 2019

Level 6mandatory

Part L Update

Level 4mandatory

Part L Update

Level 3mandatoryVoluntary

Assessmentmandatory

Code for Sustainable Buildings

Level 6mandatory

Level 4mandatory

Level 3mandatory

Government funded projects: codeforSustainableHomes

Private Sector enforcement through Building Regulations

4 | AnintroductiontoPartL2010

Document structure

Aswiththeprevious2006document,thenew PartL2010ispublishedin4parts.

Dwellings – L1 will be sub-divided into:• L1A:NewDwellings(methodofcompliance SAP2009)• L1B:WorkOnExistingDwellings(complianceachievedbytheelementapproach)

ADwellingmeansaselfcontainedunitsuchas ahouseorflatdesignedtoaccommodateasinglehouseholdandmustmeettherequirementsofADL1

Roomsforresidentialpurposes(suchasnursinghomes,residentialhomes,hostels,hotelsetc)arenotdwellingsandmustmeettherequirementsofADL2

Non-dwellings – L2 will be sub-divided into:• L2A:NewBuildings–OtherThanDwellings(methodofcomplianceNCM/SBEM2010)• L2B:WorkOnExistingBuildings–OtherThanDwellings(complianceachievedbytheelementapproach)

Responsibility for Compliance

CurrentlyagreatdealofresponsibilityisplaceduponthedeveloperstoensurecomplianceismetwhichoftenresultsinundercompliancewiththeBuildingRegulations.ForBuildingControltoproperlyenforcethechanges,amorerobustsystemofbuildingassessmentandperformancecheckingisnow beingimplemented

Itisimportanttorememberthattheperson(e.g.designer,builder,installer)carryingoutbuilding workhasaresponsibilitytoensurethattheworkcomplieswithBuildingRegulationrequirements. Thebuildingowneralsohasaresponsibilityforensuringcomplianceandcouldbeservedwithanenforcementnoticeincasesofnon-compliance.


Sec

tio

n 1

Theoretical building performance vs Actual building Performance

OneofthekeyfeaturesofthenewPartL2010amendmentisadrivetoclosethegapbetweentheperformanceanticipatedatdesignstageandwhatisactuallyachieved.

Thereisincreasingconcernthatcurrentenergyandcarbonperformancestandardsarenotbeingachievedinbuildings,asconstructed.Apartfromtheresultsofairpressuretests,whichsuggestnewbuildings,(andhomesespecially),havebecomemoreairtightovertime,thereisawiderproblemrelatingtobuildingsactuallyperformingmorepoorlythantheyshould.Evidenceavailablesuggeststhatforbuildingsbeingconstructedtothe2006regulations,emissionsmaybeintheregionof15%higherthantheregulatoryperformancelevel.(ResearchcarriedoutbyCLG).Thisisreferredtobygovernmentasthe‘performancegap’.Ifwearetoachievetruezerocarbonby2016itisvitalthatthisgapbeclosed.

New measures put in place to improve compliance on site

1) Clearer Guidance:Thenewdocumentisclearerthanpreviousversionsindistinguishingbetween‘Regulation’and‘Guidance’.Thisshouldhelpdevelopersbetterunderstandwhatisrequiredofthemandgivebuildingcontrolclearerguidanceonhowtocheckforcompliance.

2) Design Submissions:Therequirementtoproducea‘designsubmission’aswellasan‘asbuiltsubmission’,includingacomparisonofspecifications,willhopefullybringmorestandardisationandrigourtothecompliancechecks.ThiswouldinvolvedevelopersprovidingBuildingControlBodies(BCBs)withadesign-stagesubmissioncontainingnotjusttheSAPcalculationbutalsothecomponentspecificationswhichthedeveloperisgoingtousetodeliverthisresult.ThisKeyfeatureslistprovidedwiththedesignstagesubmissionwillhelptoprioritiseonsiteinspections.(ThepersonthatpreparestheSAPcalculationwouldberesponsibleforcheckingthattheproposedcomponentspecificationisconsistentwiththeclaimedenergyperformance.).ArevisedSAPcalculationmustbesubmittedifthereareanychangestotheoriginalspecificationi.einsulationtypeorthickness,boilertype,windowsetcthen.

BCBsshouldreceivemoredetailedandaccurateinformationatthedesignstage,tostrengthentheabilitytoenforcethenecessaryRegulations.Thiswouldprovideclaritytodevelopersandarchitectsatthisvitalstageintheconstructionprocess.ByprovidingBCBswithmorerobustinformationaspartoftheBuildingRegulationssubmission,theywillbemoreabletocheckcomplianceonsitevisits,andtherefore,itismorelikelythatthefinishedpropertywillmirrorthe‘asdesigned’specification.Itwillstrengthentheirpositionandenablethemtoenforceandimproveonsomeofthepoorerconstructionstandards.

WithprofessionalenergyassessorsworkingintandemwithBCBstheconsumercanhavefullconfidenceinboththefinishedbuildingandtheEnergyPerformanceCertificate.

3) Reducing Thermal bridging/Accredited Construction Details scheme:AmongstothermeasuresthataddresstheneedtoreduceCO

2

emissions,thatofhavingbetterinsulatedbuildingsrequiresmoresophisticatedmethodssuchasnumericalmodellingtocalculatetheheatlosscausedbythermalbridgingatwall,roofandfloorjunctionsandaroundopenings.

InPartL2006,itwasacceptabletoassumeaneffectiveU-value(theyvalue)of0.08W/m2Kifaccreditedconstructiondetailshavebeenused. ThiswillnotbepossiblewithPartL2010.Instead,thelengthofeachjunctionwillneedtobemeasured,multipliedbytheappropriatepsivaluesandaddeduptoproducetheyvalue.ThepsivaluescaneitherbevaluesalreadysuppliedintheSAP2009documentorsuppliedbytherelevantapprovedgovernmentaccreditedconstructiondetailscheme.(0.04isthelikelyfiguretomeetcomplianceandstandarddetailsarebeingderivedbyBRE)

WiththeAccreditedConstructionschemedeveloperswouldberequiredtoregistertheiruseofaccrediteddetailsinordertoreceiveauniquereferencenumberwhichtheycouldinputintoSAP.Theoperatorsoftheschemewouldcarryoutrandomspotchecksonasampleofdevelopmentstoensurethattheaccrediteddetailswerebeingusedinpractice.(SimilartocurrentrequirementsforPartERobustdetails).

ConventionsforCalculatingLinearthermaltransmittanceandTemperatureFactors(BR497): Thisguidegivestheconventionsthatshouldbefollowedbynumericalmodellerstoproduceconsistent,reproducibleresults.ForBuildingRegulationpurposestwokeymodellingoutputs,temperaturefactorandlinearthermaltransmittance,areidentified.Thesekeyoutputswillenabledesignerstoconfirmtheadequacyofparticularjunctiondetailsandhelpwiththedevelopmentofnovelsolutionstoimprovethethermalperformanceofjunctions.

4) Developer confirms as-built conforms to design submission:ThiswouldinvolvedevelopersprovidingBCBswithanadditionalas–builtsubmissionwhichwillthenrequireanadditional“asbuilt“SAP/EnergyCertificate.Thenotionof‘confidencefactors’shouldstarttorewardthosedeveloperswhoadoptgoodqualitycontrolproceduresbothindesignandonsite.


‘Design’ submissions are now part of the Regulation AdesignstagecalculationandspecificationlistsubmissiontoBuildingControlBodieswillbeamandatoryrequirementbeforebuildingworktakesplace.PreviouslyonlytheAs-builtcalculationwas amandatoryrequirement.

Party walls–Plustheirassociatedthermalbypassheatlosseswillbeincludedforthefirsttimeinthecalculations.Youwillneedtoinsulateandsealyourpartywallcavityorusesolidwallsjusttomatchthenotionalbuilding.

Thermal bridges–‘AccreditedDetails’schemeaimedatensuringthatdevelopersonlyclaimenhancedbenefitsintheirSAPmodellingbyusingapprovedaccreditedconstructiondetailswhichhaveactuallybeenused(0.08foraccreditedconstructiondetailsisnolongeranoption)

Swimming Pools–NewIndoorswimmingpoolswillrequireaU-valueforthebasinwallsandfloorwhichshouldbenoworsethan0.25W/m²K

Air Permeability–Furtherimprovementsonairtightness.PartL2010nowrequiresdoublethenumberofpressureteststomeetcompliance.Generally avaluebetween5.0&7.0m3/(hm2)willgenerally needtobeachieved.Avalueof15.0m3/(hm2)can stillbeusedinsmalldevelopmentsbutwilltend torequireimprovingfurthertheperformanceofthermalenvelope.

Thermal Mass–TheheatcapacityoftheexternalandinternalbuildingfabricwillbeusedinthecalculationofTER&DERresults.Youwillnowhavetodefinetheinternalwalls,floorsandceilingsalongwithanypartywalls.Increasingtheeffectivethermalmassreducestheneedforheatingandcooling.Howevertherulesforcalculatingheatcapacitymeanthatitemssuchasinternaldrylining,thermalliningandlightweightconstructionswillreduceyoureffectivethermalmass.

Fabric limits–MaximumareaweightedU-valueshavebeenimprovedfromthe2006standards.TheareaweightedU-valuesshowninPartLaremaximumvaluesandunlikelytobelowenoughtocomplywithCO2emissionsrequirements.

Summary of Main Changes to Part L (2010)

U-Value Competency

RockwoolisoneofthefirstorganisationstobeapprovedunderanewvoluntaryU-valueandCondensationRiskCompetencySchemeintroducedbytheBritishBoardofAgrément(BBA)inassociationwiththeThermalInsulationManufacturersandSuppliersAssociation(TIMSA).

TheschemewasdesignedinresponsetoawidelyheldbeliefthatmanyU-valuecalculationssubmittedwereinaccurate.ThisassumptionhasbeensupportedbyrecentfindingsthatSAPassessorsarefrequentlygivenincorrect,incompleteorcontradictorydesigninformationconsequentlythereisastronglikelihoodthatthecarbonemissionscalculatedunderSAPmaynotbecorrect–andtheaffecteddesignsmaynotbecompliantwithBuildingRegulations.

Astudypublishedin2009bytheEnergyEfficiencyPartnershipforHomes(EEPH)andtheDepartmentofCommunitiesandLocalGovernment(CLG)reportedthat,in68%ofthedatasetsexamined,errorsoccurredininterpretingSAPconventionsforanumberofinputs;incorrectU-valueswerethemostfrequentsourceofinputerror*.

ToaddressthisproblemRockwool,alongwithotherTIMSAmembershaveworkedwiththeBBAtodevelopacompetencyschemetopromoteandassistaccurate,objectiveandconsistentcalculationofU-valuesandcondensationriskwithinbuildings.

RegistrationundertheSchemeprovidesreassurancetoaspecifieroruserthattheservicesorthedatabeingprovidedbyaschemememberhasbeensubjecttoarigorousindependentassessmentprocess.Theycanthereforebeassuredthatthisoutputisrepresentativeandreliable.

CalculationsprovidedbyqualifiedRockwoolemployees–andthoseprovidedbyRockwoolaswhole–arebackedupbytheBBACompetentPersonsLogo,whichsignalstoacustomerthatthedataprovidediscredible.RockwoolhavealsoestablishedaqualitycontrolsystemthatensuresthatallU-valueorcondensationriskcalculationsundertakenbythecompanyarecarriedoutdirectlybyafullyqualifiedcompetentperson,thuscomplyingwiththeScheme’srequirements.

TheuseofcorrectU-valuesisfundamentaltocompliancewithBuildingRegulations,determiningheatingandcoolingcostsforthebuildingoccupierandassessingenvironmentalperformance.

RockwoolandtheBBAencourageorganisationsthatrequireU-valueandCondensationriskcalculationsto obtainthisinformationfromsuitablyqualifiedcompanies. *EEPH/CLGResearchintoCompliancewithPartLoftheBuildingRegulationsforNewHomes–Phase2MainReportv0.4–30/4/09


Influential Design Principals

Alwaysstartwiththebuildingfabric.–Thefoundationofcomplianceshouldbethebuildingenvelope.

Buildingtype&configuration

BuildingEnvelopeU-values.

Glazingarea&orientation(solargain)

Thermalbridging(accreditedconstructiondetails)

Heating&hotwaterstorage:(fueltype,boiler &controls)

Ventilation(natural/mechanicalA/C)

Lighting(internal&external)

AirtightnessOneofthemaincausesofheatlossfrom homes is air leakage .

1 6

2 7

3 8

4

5

CompliancewiththeamendedApprovedDocumentisacomplex matterwithasignificantnumberofdesignconsiderationsthatneed tobeaddressed.

FormostnewbuildingsitshouldbepossibletoachievetherequirementsofPartL2010withouttheneedtouserenewableenergytechnologies.

The primary factors that will determine compliance are shown in the illustration.


Section 2 – New Build Dwellings (ADL1A)

Inadditiontothisandtoavoidcompliancebeingdependantonemergingtechnologies(suchasrenewableenergysystems)thefabriclimitshavebeenstrengthenedtoensurethatbuildingelementsachieveahighlevelofthermalinsulationperformance.

• ThemaximumareaweightedU-valuesfor wallsimprovedfrom0.35W/m2Kto0.30W/m2K,• ForRoofsfrom0.25W/m2Kto0.20W/m2K,• ForGlazinganddoorsfrom2.2W/m2Kto2.0W/m2K• Partywallsintroducedat0.20W/m2K.

RememberthatthesearemaximumvaluesandsignificantlybetterfabricperformanceswillberequiredtoachievetheoverallTERCO2 targets.

New Dwellings

AswiththepreviousdocumentthenewPartL2010adoptsasinglecomplianceroutebasedonthewholebuildingenergyperformanceapproach.ThereforeelementalU-valuesalonewillnotachievetherequired25%improvementfactor.

Method of compliance – SAP 2009 (adopting the “Flat” Approach)

Underthe“flat”approach,compliancewithPartL1Awillberequiredtobedemonstratedforeachindividualbuildingtypeinadevelopment.Thiswillneedtotakeintoaccountsize,orientationanddwellingtype(semi,endofterraceetc).

The2010TargetEmissionsRate(TER)wouldbe25%belowthe2006TER.Fornewdwellings,thereductioninCO2emissionsrelativetothenotionaldwelling(2002regulations)wouldincreasethecurrent20%bettermenttoapproximately40%.ThisisequivalenttoachievingCodeforSustainableHomesLevel3forCO2 emissions.

Influential factors: Inordertomeetcompliance,thefollowingconsiderationswillbeneedtobeaddressedatthedesignstage:• Buildingtypeandconfiguration• BuildingfabricU-values• Glazingandorientationofbuilding(solargain)• Thermalbridgingdetails• Spaceheatingandhotwater• Ventilationnaturalormechanical• Lighting• Airtightnessofthebuildingfabric


Sec

tio

n 2

There are a host of improvements to the SAP calculation methodology which will enable it to better reflect the performance of low energy buildings

1. A design stage calculation and specification list submission to Building Control Bodies will be a mandatory requirement before building work takes place. Previously only the As-built calculation was a mandatory requirement.

2. The TER and DER calculations will be calculated using SAP 2009 and will represent an additional 25% improvement on the previous regulations. Due to the significant number of changes to the calculation, do not automatically expect your previous Code Level 3 specifications or guidance to

achieve a Building Regulations pass under the new system without major revisions.

3. Party walls and their associated thermal bypass heat losses are will be included for the first time in the SAP calculations. You will need to insulate and seal your party wall cavity or use solid walls just to match the notional building. It will be impossible to improve on a U-value of zero which forms the basis of the Notional building. 4. The introduction of the Emission Factor Adjustment ‘EFA’ for heating and lighting will cause increased emissions for some fuels in the calculations. For example the EFA will effectively increase the CO2 emissions from grid electricity by 22.5%, bulk LPG by 4.7%, heating oil

by 3.4% and mains gas by 2% in the calculations Your choice of heating fuel has major implications on the CO2 emissions of the dwelling.

5. Thermal Mass The heat capacity of the external and internal building fabric will now be used in the calculation of TER & DER results. You will now have to define the internal walls, floors and ceilings along with any party walls, floors and ceilings. Increasing the effective thermal mass reduces the need for heating and cooling. However the rules for calculating heat capacity mean that items such as internal dry lining, thermal lining and lightweight constructions will reduce your effective thermal mass and therefore increase your CO2 emissions assuming U-values are unchanged.

6. You can now select up to 100% low energy lighting and take the corresponding savings in CO2 emissions. Previously you were restricted to a maximum of 30%, which was the same as that used in the notional building, regardless of the percentage of low energy lighting that you may have designed into your scheme.

7. Fabric limits have been strengthened, maximum area weighted U-values for walls improved from 0.35 to 0.30, Roofs from 0.25 to 0.2, Glazing and doors from 2.2 to 2.0 and Party walls introduced at 0.20. Remember that these are maximum values and are unlikely to be low enough to help you comply with the CO2 emissions.

Main changes to SAP 2009 (New build dwellings (ADL1A)

New build dwellings : U-value guide:

Duetothecomplexityofthedesignissueswithinthenewapproveddocumenttherewillnotbeasinglefabricsolutionforallnewbuilddwellingtypes.DesignersandbuilderswillfindthatcompliancewillonlybeachievedwitharangeofU-valuesasshownin the table below

Table1belowprovidesareasonableassessmentofthefabricU-valuesrequiredtodelivera25%reductionincarbonemissionsfornewbuilddwellings.

TheU-valuesshownhavebeendeterminedusingSAP2009softwarebasedonanumberofdifferentmodelhousetypedesigns.

In determining these U-values above other influential factors included the following:

• AirPermeability = 5–7m3/hr/m2

• Thermalbridging = 0.04W/m2K(50%improvementoncurrentdefaultallowance)• Partywall(semidetachedunits&flats) = Zero• WindowAv.U-value = 1.2to1.5W/m2K• Spaceheating = GasBoiler90%• Lowenergylighting = 100%• Ventilation = Natural

Fromatechnicalpointofview,2010compliancecanbeachievedbyimprovementstothebuildingfabricalone,withouttheneedforrenewabletechnology.

Element 2010 (25% CO2 reduction)

Walls0.27 to 0.24 W/m2 K Recommend 0.25 for design purposes

Pitched Roof insulation @ ceiling line 0.16 to 0.13 W/m2 K

Pitched Roof insulation @ rafter line 0.18 to 0.16 W/m2 K

Flat Roof or roof with integral insulation 0.18 to 0.16 W/m2 K

Ground Floors 0.20 to 0.15 W/m2 K

Party walls attached houses & flats Zero W/m2 K

Table 1 U-value guidelines for new dwellings


New Dwelling Case Studies

Element DetachedSemi-detached(Filled Party Wall)

Semi-detached(Non-filled Party Wall)

Mid terrace Mid floor flat

Floor area > 118m2 88m2 88m2 74m2 43m2

Roof u-value 0.13 0.16 0.16 0.16 N/A

Wall u-value 0.25 0.25 0.16 0.15 0.19

Party wall u-value N/A 0 0.20 0 0

Floor u-value 0.20 0.20 0.20 0.20 N/A

Window/doors u-value 1.5 1.5 1.5 1.5 1.5

Gas boiler efficiency 90% 90% 90% 90% N/A

Electric heat efficiency N/A N/A N/A N/A 100%

Secondary heating None None None None Electric

Design air permeability 5 5 5 5 5

Thermal bridging y-value 0.04 0.04 0.04 0.04 0.04

Hot water insulation (mm) 100 100 100 100 100

Ventilation system Natural Natural Natural Natural Natural

Low energy lighting 100% 100% 100% 100% 100%

Thermal mass parameter Low TF medium medium medium medium

Area EntriesRoof heat loss area 59 44 44 37 0

Wall heat loss area 147 108 108 64 43.34

Party wall area 0 43 43 77 25.68

Floor heat loss area 59 44 44 37 0

Opening area 20.25 18.76 18.76 14.58 12.08

Total external surface 265 196.4 196.4 138.0 43.34

Renewables no no no no no

Main ResultsTER 17.99 18.89 18.89 18.06 33.47

DER 17.84 18.72 18.80 18.00 33.32

Pass/Fail Pass Pass Pass Pass Pass

Notes:• TheseassessmentshavebeencalculatedusingNHERSAP2010(preview1.4.14)toprovidepasseswithouttheneedforrenewables.• Thehousetypesshownaretobeusedasguidancepurposesandmayvarypendingspecificdesignconcepts.• VariationssuchastheThermalmassparameter,airpermeabilityandtheintroductionofrenewablesi.esolarwaterheating,willalsoimpactontheresultsshownabove.


Sec

tio

n 2Solutions that meet PART L1A – without

renewable energy generation.

Workingontheprincipalthatmeetingthe requirementsofPartLshouldstartwiththebuildingfabric,thetableonpage10showsthatitisquitepossibletoachievecompliancewithouttheneedforrenewableenergytechnologies.

TheexamplesshownclearlydemonstratethatU-valuesforthebuildingfabricwillvaryfromdwellingtypeacrossasite.InallcasesthebuildingfabricU-valuesrequiredaresignificantimprovementsonthose being built to meet Part L 2006 but still within theboundariesofpracticalaffordability.Obviouslyvariationonthecompliancemodelcanbeachievedbyusingdifferentelementssuchashigherefficiencyboilersforexample.

Section5(pages18to21)ofthisguideprovide aselectionofsometypicalconstructiondetails toachievetheU-Valuesshowninthistable.

IntheseexampleswehavetakensomestandardhousetypesandappliedthemtoNHERSAP2010withtheidentifieddesigncriteria.Inallcasescompliancehasbeenachievedapracticalandcosteffectivemanner.

The effect of Party wall Bypass

Thetwocompliancemodelsforthesemidetachedhouseshowthehugeimpactthatnotfillingthepartcavitywallcanhave.Inthefirstwehaveassumed thatthepartywallisacavitywallwhichhasbeen filledwithmineralwoolandsealedattheedges. TheresultbeingthataU-Valueofjust0.25W/m2K isrequiredfortheexternalwalls.Inthe2ndexamplethecavityisunfilledbuttheedgesremainsealedthusassumingthedefaultU-valueof0.20W/m2Kforthepartywall.InthiscasecomplianceisachievedbymovingtheU-valueoftheexternalwallsto0.16W/m2K–ahugeincreaseincostandwallthickness.

Pages12and13explaintheprincipalsthePartyWallThermalbypasseffectinmoredetail.

Thermal Mass

Inmostcaseswehaveassumedthatthebuildingsareofamediumthermalmasswhichisindicativeoftraditionalbrickandblockconstruction.Thedetachedhouseexampleusesalowthermalmassparameterwhichisindicativeoflightweightconstructionsuchastimber frame.

Air Tightness

ThelimitingvaluefortheairpermeabilityoftesteddwellingsinApprovedDocumentL1Aremains as 10 m3/(h.m2)atatestpressureof50pascals.HoweverSAP2009willassumeanairpermeability of7m3/(h.m2)inthenotionaldwellingandunlessotherenergysavingmeasuresareincorporatedintotheproposeddwelling,thenadesignairpermeabilityoflessthan7m3/(h.m2)mayberequired.Inourexamplesonpage10wehaveassumedanairtightnessof5whichwebelieveisachievableon apracticalbasisforbothmasonryandotherforms of construction.

Improvingtheairtightnessofthebuildingcanhave asignificanteffectonthefabricU-values.


Party Wall Bypass Effect.

Contrarytopreviousassumptions,partycavity-wallsarenotzeroheatlosswallsbecauseairflowinthecavityprovidesaheatlossmechanism.AmendmentstoPartL1A2010ofEnglandandWales’sBuildingRegulationsandSection6ofScotland’sBuildingstandards(domestic)haveforthefirsttimerecognisedthatwherepartycavity-wallsbetweenconnectedbuildingsareuntreated,considerableheatcanescapethroughthem.AkeyfeatureofSAP2009 isthatpartywallswithunfilledandunsealedcavitiesareassumedtohaveaU-valueof0.5W/m2K.

IncalculatingtheDERforaDwelling,thepartywallU-valuetobeassumedforthetypeofconstructionadoptedissetoutintable2below.

Party Wall Construction U-Value

Solid 0.00 W/m2K

Unfilled cavity with NO effective edge sealing 0.50 W/m2K

Unfilled cavity with effective edge sealing around all exposed edges and in line with insulation layers in abutting elements

0.20 W/m2K

Fully Filled cavity with effective edge sealing at all exposed edges and in line with insulation layers in abutting elements

0.00 W/m2K

Table 2

When applying the U-values in Table 2 it is important that where edge sealing is adopted, either on its own or in conjunction with a fully filled cavity, the sealing is effective in restricting air flow and is aligned with the thermal envelope.

Although effective sealing may be part of a cavity barrier, which is provided in order to comply with Part B (Fire), a cavity barrier on its own may not be effective in restricting airflow.

In order to claim a reduced U-value (0.2W/m2K or 0.0W/m2K) it will be necessary to demonstrate that the design adopted is likely to be robust under normal site conditions.

Loft Space House A

Loft Space House B

Roof TilesRoof Tiles

Loft Insulation

Intermediate Floor

Party Wall

Cold External Air Infiltrating into Party Wall Cavity

Ground Floor Slab

Loft Insulation

Intermediate Floor

Ground Floor Slab

First FloorHouse A

First Floor House B

Ground FloorHouse A

Ground Floor House B

How it occurs

Whereoutsideairisabletoflowintothepartywallcavityacoldzoneiscreatedwhichresultsinheatfluxthroughthewallsectionsoneitherside.Theextentofwhichwilldependonexternalconditionssuchaswindandtemperatureswhichcreateaventilationstackeffectcausedbythewarmedairrisinginthecavitytobereplacedbycoolerairdrawninfromoutside.Theseairmovementscanbesignificantand,ifnostepsaretakentorestrictflows,theresultingheatlossescanbelarge.

AkeyfeatureofSAP2009isthatpartywallswithunfilledandunsealedcavitiesareassumedtohaveaUvalueof0.5W/m2K.ThenotionaldwellingusedincalculatingtheTERassumesaU-valueforcavitypartywallsofZERO(0.0W/m2K)

Acoustic Solutions

Withitscombinedthermalandacousticproperties,mineralwoolinsulation,suchasRockwool,hasbeenproventobeaneffectivemeansofmeetingthisnewchallenge.Recentfieldtrailshaveproventhatmasonrycavitiesfullyfilledwithblownmineralwool

insulation,notonlyhelpstoeliminatetheheatlossbutalsomeetstheRobustDetailsacousticperformance.Whenconsideringfullyfillingthepartycavity-walltheoverallmethodofconstructionwillinfluencethechoice of solution.

Further details along with comprehensive design advice can be found in the MIMA design guide: Preventing Thermal Bypasses in Party Separating Walls which can be downloaded from the mima website www.partywallbypass.com

Figure.AMasonry with Render and Plasterboard on Dabs

Figure.BTimber Frame Without Sheathing

• Externalcavityflankingwall• RockwoolPartyWallEdgeSeal• Partywallcavity 75mm(min)fullyfilledwithinjectedRockwoolEnergySaver

• Partywall Block100mm(min)eachleaf,density1350to1600kg/m3

• Wallfinish Gypsum-basedboard(nominalmass 8 kg/m2)mountedondabsoncement:sandrender(nominal8mm)withscratchfinish,andtypicalmix1:1:6to1:1/2:4.Rendermixmustnotbestrongerthanbackground.

• Externalcavityflankingwall• RockwoolPartyWallEdgeSeal• Partywall Width240mm(min)betweeninner faces of wall linings. 600mm(min)spacingbetweenstuds(mustnotbebridgedbyanydiagonalbracing)

• Interstudabsorbentmaterial Rockwoolrollorbatts,density22 kg/m3 to 60 kg/m3 to the full studdepth

• Interframeabsorbentmaterial Rockwoolrollorbatts,density22 kg/m3 to 45kg/m3,tofullyfillthevoidbetweenframesandbeinfullcontactwiththeinterstudabsorbent material.

•Wallliningas Robust Detail E–WT–I


Sec

tio

n 2Reducing heat loss from party walls

Theheatlosscanbereducedbymeasuresthatrestrictairmovementthroughthecavity,bymeansoffullyfillingthecavitywithmineralwoolandbyprovidingeffectiveedgesealingaroundtheperimeterwalls.Theextenttowhichheatlosscanbereducedwillbedependentonthedetaileddesignandthequalityofconstruction.

Theillustrationsbelow(figAandB)showthecurrentsolutionsdevelopedtoachieveazeroU-valueinthepartycavitywall.

Formasonrypartycavity-wallstheuseofblownmineralwoolinsulation,withamaximumdensityof40kg/m3hasbeenshownbysitetrialstoeliminateheatlossthroughthewallwithoutadverselyaffectingitsacousticinsulationperformance.

Forlightweightframedconstructionssuchastimberframe,thepreferredsolutionfortheindustrywillbetouselightweightfullfillslaborrollinsulation“builtin”asthewallconstructionproceeds.(Discussionsarecurrentlyongoingwithtimberframesystemholderstodeveloptestingprogrammes.)

TheintroductionofrequirementstoeliminatethePartyWallBypassEffectsupportsthedrivetodeliver‘real-life’energyefficiency,closingthegapbetweendesignedandas-builtperformance.Rockwool,withMIMA,areactivelyinvolvedindevelopingboth“built-in”and“retrofit”Robustsolutionstomeetthesenewproposals.

Method of compliance

Newnon-domesticbuildings:willrequirean“aggregate”improvementof25%intheenergyefficiencystandardsusingSimplifiedBuildingEnergyModel(SBEM)2010.Thisapproachreflectsthefactthatitisrelativelystraightforwardinsomebuildingtypestoimprovetheenergyperformancebymorethan25percent,whilstinotherbuildingtypesa25percentimprovementbecomesmuchmoredifficult.

Forexample,awarehousethatismostlyroof-litwouldbedifferentfromanofficewhichisside-litorabuildingwithnoglazingsuchasacinema.Thebuildingswillbeinzonessomaycombinedifferentelementsoftheglazingdefinition.

TheTargetEmissionsRate[TER]willvarybasedonwhatfuelisusedsothatmostbuildingwillhavecomparableefficiencystandardsregardlessoffuelused.Therewillnolongerbeanimprovementfactor;thesoftwarewillgenerateaTERwhichthedesignermustequalorexceed.


New buildings “other than Dwellings” (ADL2A)

Aswithnewdwellings,newbuildnondwellingsalsoadoptasinglecomplianceroutebasedonthewholebuildingenergyperformanceapproach

Air Pressure testing.

Allbuildingsmustnowbepressuretested,otherthanbuildingslessthan500m2.ThelimitingvaluefortheairpermeabilityofbuildingsinApprovedDocumentL2Aremainsas10m3/(h.m2)atatestpressureof50pascals.However,theNationalCalculationMethodologywillassumeanairpermeabilityof5m3/(h.m2)inthenotionalbuildingandunlessotherenergysavingmeasuredareincorporatedintotheproposedbuilding,thenadesignairpermeabilityoflessthan 5 m3/(h.m2)mayberequired.

Section 3

Duetothere-developmentoftheSBEMcalculationsoftware,atthetimeofgoingtoprint,ithasnotbeenpossibletoprovideclearsolutionstomeetingtherequirementsofPartL2A.Wewillpublishmoredetailsonourwebsiteinduecourse.ForfurtherdetailspleasecontacteitherRockwoolTechnicalserviceson08712221780


Element 2010 25%

Walls 0.25 to 0.24 W/m2 K

Roofs 0.20 to 0.16 W/m2 K

Ground Floors 0.22 to 0.20 W/m2 K

Table 3*

Sec

tio

n 3

In determining these U-values above other influential factors included the following:

• Windows&doors=U=1.8W/m2 K>1.5W/m2 K• Airpermeability=5m3/hr/m2

• Gasboilerefficiency=90%• Centralmechventilation=1.80• Multi-burnerradiantsystem=86%

*TablebasedonDraftCLGModellingSoftware

New Build Non Dwellings: U-value Guide

Thereisnosinglesolutionwhichcanbeappliedtoallbuildings.Constructionspecificationswillvarydependingonawiderangeofcriteriaincludingthebuildingtype.ItshouldbenotedthatnaturallightingandartificiallightingcanhaveanimpactontheoverallbuildingfabricU-values.

Table3providesindicativeU-valuesfornondomesticbuildingswhichhavebeenbaseddraftCLGmodellingusinggasheatingandthe“aggregate”25%approach.

IfabuildingfailsitsSBEMBER–TERcheck,themostlikelycausesinorderofprobabilityarelighting,heating,auxiliaryenergyandhotwater.

• testedsolutionstomeetallBB93requirements• easytouseBRERainNoisecalculatorhelpsyoufindthesolutionforeachclassroom

• BREtestreportsavailableonrequest• canalsobeusedtomeetthermal,fire-stopping,lightreflectionandsustainabilityrequirements

• theadditionofaRockfonceilingsystemwillfurtherenhancetheacousticperformanceoftheroof

OftenthermalinsulationmaterialscanbeusedtomeetmorethanthethermalrequirementsoftheBuildingRegulations.Forexample,raincancauseunacceptablelevelsofbackgroundnoiseduringclass,seriouslyimpairinglearningandconcentration.Theproblemisparticularlyacutewithlightweightroofingcommonlyusedonschoolbuildings.TheissuehasbeenrecognisedinBB93,aswellasotherbestpracticecodesandguidelines.

Rockwoolinsulatedroofs,canhelpsatisfytherelevantcriteriaforrainnoiseresistance,reverberationtimeandspeechintelligibility.

Improve rain noise performance using Rockwool roofing solutions

Try Rockwool’s rain noise calculator at

www.rockwool.co.uk/education


Section 4

Work on Existing Buildings Dwellings (ADL1B) & Non-dwellings (ADL2B)

Scope of works covered:

• Extensions• MaterialChangeofuse&Changeofenergystatus.• Workoncontrolledfittings&Services.• Renovationwork

Overview of Works for Extensions, Renovation & Repair work

CompliancewiththenewPartLwillberequiredwhen peopleelecttocarryoutworktoexistingbuildingsincludingextensionsandconversions,fabricrenovations,replacementwindowsandboilers

Aswithnewbuild,thereisageneralraisinginbuildingstandardsforexistingbuildingswithmorefocussedguidanceforthermalelements,replacementfittings,andheatingsystems.

However,unlikenewbuild,compliancecanstillbeachievedbyusinganelementalU–valueapproach asshowninthetablesbelow(forgreaterflexibility aSAP/SBEMmayalsobeused).

Elemental U-values for Extension work.

Reasonableprovisionfornewlyconstructedthermalelementssuchasthoseconstructedaspartof anextensionwouldbetomeetthestandardssetoutinTable4below(Thesealsoapplytoexisting nondomesticbuildings)

Element 2010 Standards 2006 Standard

Wall 0.28 W/m2 K 0.30 W/m2 K

Pitched Roof insulation @ ceiling line 0.16 W/m2 K 0.20 W/m2 K

Pitched Roof insulation @ rafter line 0.18 W/m2 K 0.20 W/m2 K

Flat Roof or roof with integral insulation 0.18 W/m2 K 0.20 W/m2 K

Floors 1 0.22 W/m2 K 0.22 W/m2 K

Swimming Pool basins 0.25 W/m2 K N/A

Alesserprovisionmaybeappropriatewheremeetingsuchastandardwouldcreatesignificantproblemsinrelationtoadjoiningfloorlevels.ThefloorU-valuefortheextensioncanbecalculatedusingthep/aofthewholeenlargedbuilding.

For Large non–domestic extensions L2B :wherefloorareaoftheextensionisgreaterthan100m2 and25%ofexistingfloorarea:TreatasnewbuildusingSBEMmethodology

Table 4 SummaryofnewfabricU–valuesfornewthermalelements

WindowsFormostexistingbuildings,thestandardfornewandreplacementwindows,isnowexpressedasaWindowEnergyRatingratherthanaU-value,withthestandardbeingraisedbytwogradingbands(from“E”to“C”).TypicallyUof1.6W/m2Kfordwellingscomparedto2.0W/m2Ktoday.

PleaserefertotablestandardsforwindowsanddoorsforexistingdwellingsandnondwellingsinPartL1B andL2B


Sec

tio

n 4Upgrading retained thermal elements & Refurbishment in existing buildings

(Dwellings & Non dwellings)

This Applies to following work:• Materialalterations• Whereexistingelementbecomespartofthethermalenvelopewherepreviouslyitwasnot.(Changeofenergystatus)• Renovation/refurbishmentofthermalelements

Renovation work in relation to thermal elements.Renovationinrelationtoathermalelementmeanstheprocessofstrippingdowntheelementtoexposethebasicstructuralcomponents(brick,timber/metalframe,joists,raftersetc.)andthenrebuildingtoachieveallthenecessaryperformancerequirements.

Renovationonlyapplieswheretheareatoberefurbishedisgreaterthanoneofthefollowinglimits(smallerproportionsbeingregardedasrepairs):a)50%ofthesurfaceoftheindividualelement;orb)25%ofthetotalbuildingenvelope

Element (a) Threshold U- value (b) Improved U- value

Wall (cavity blown)2 0.70 W/m2 K 0.55 W/m2 K

Wall (externally or internally insulated) 3 0.70 W/m2 K0.30 W/m2 K(was 0.35 in ADL 2006)

Pitched Roof insulation @ ceiling line 0.35 W/m2 K 0.16 W/m2 K

Pitched Roof insulation between rafters 6 0.35 W/m2 K0.18 W/m2 K(was 0.20 in ADL 2006)

Flat Roof or roof with integral insulation 7 0.35 W/m2 K0.18 W/m2 K(was 0.25 in ADL 2006)

Floors 4, 5 0.22 W/m2 K 0.25 W/m2 K

Table 5 Upgradingretainedthermalelements&Refurbishment

1 Roofincludestheroofpartsofdormerwindowsandwallincludeswallsofdormers

2 thisappliesonlyinthecaseofawallsuitableforinstallationofcavityinsulation.Wherethisisnotthecasethenitshouldbetreatedas‘wall’-externalorinternalinsulation.

3 Alesserprovisionmaybeappropriatewheremeetingsuchstandardswouldresultinareductionofmorethan5%intheinternalfloorareaoftheroomboundedbythewall

4 Alesserprovisionmaybeappropriatewheremeetingsuchastandardwouldcreatesignificantproblemsinrelationtoadjoiningfloorlevels.

5 TheU-valueofthefloorofanextensioncanbecalculatedusingthep/aofthewholeenlargedbuilding.

6 Alesserprovisionmaybeappropriatewheremeetingsuchstandardswouldcreatelimitationsonheadroom.Insuchcasesthedepthoftheinsulationplusanyrequiredairgap,shouldbeatleastthedepthoftheraftersandthermalperformanceofchoseninsulantsuchastoachievethebestpracticalU-value.

7 Alesserprovisionmaybeappropriateifthereareparticularproblemsassociatedwiththeloadbearingcapacityoftheframeorupstandheight.

Notes relating to Renovation Work and table 3 aboveWhereathermalelementissubjecttoarenovation,theperformanceofthewholeelementshouldbeimprovedtoachieveorbettertherelevantU-valuesetoutincolumn(b)ofTable3.IfachievementoftherelevantU-valuesetoutincolumn(b)ofTable3isnottechnicallyorfunctionallyfeasibleorwouldnotachieveasimplepaybackof15yearsorlesstheelementshouldbeupgradedtothebeststandardthatistechnicallyandfunctionallyfeasible.(GuidanceonthisapproachisgiveninAppendixA.tableA1ofADL1B&L2B))


Section 5 – A Selection of New Build guide solutions (ADL1A & ADL2A)

External wall constructions toachieveaU-valueof0.25W/m2K

Masonry cavity External Walls: • 102mmFacebrick,:• 110mmRockwool“Cavity”fullfillbatts,• 100mmAircreteblock(Lambda0.150W/mK)• Plasterboardondabfinish.

Masonry cavity External Walls:• Renderon100mmmediumdenseblock• 100mmRockwool“Cavity”fullfillbatts,• 100mmAircreteblock (Lambda0.110W/mK)

• Plasterboardondabfinish

Masonry cavity External Walls – Built in (U-value 0.25 W/m2K)

Cavity walls – Fully filled batts

Masonry cavity External Walls: .• 102mmFacebrick,:• 110mmRockwool“EnergSaverblown”

full fill• 100mmAircreteblock(Lambda0.110W/mK)• Plasterboardondabfinish.

Masonry cavity External Walls:• Renderon100mmmediumdenseblock• 105mm Rockwool“EnergySaverblown”fullfill100mmAircreteblock (Lambda0.110W/mK)


Masonry cavity External Walls – Retrofit (blown insulation)

• RockShield render on 75mm RockShieldslab,

• 215mmsolidAircreteblock3.6N (0.150W/mK)


• BrickShieldon 105mm Rockwool Facade Ultra

• 215mmsolidAircreteblock3.6N (0.150W/mK)


Solid walls

CompliancewithallsectionsofPartL2010can beachievedwithavarietyofdifferentconstructions.Acrossthefollowingpagesweprovideasmallselectionofbuildingfabricsolutionsforboth dwellingsandnondwellingsaswellasnewbuild andextensions.Furthersolutionsareavailablefromourbrochure:RockwoolGuidetoU-valueswhich canbedownloadedfromourwebsiteat www.rockwool.co.uk/partL.

AwiderrangeofconstructionscanbefoundinourGuidetoU-valuesavailablefromourwebsite www.rockwool.co.uk/partL


Sec

tio

n 5

Construction 3: Hybrid frame U–Value 0.25 (new build)• Cavitywallwith30mm Rockwool HP

partial fillonstdBreathermembraneon9mmOSBon120mmsolidstudsfullyfilledwith 120mm Rockwool Flexi

• Std.VCL&12.5mmPlasterboardu-value 0.25 W/m2K

• Dittoaboveusing 140mm Rockwool Flexi in 140mm stud U-Value =0.22 W/m2K

Construction 4: Solid 140 stud Single Timber framed wall 15% bridging U-value 0.25 W/m2K (withtimbercladdingortilehanging)

• Cladding,Breathermembrane,9mmOSB140mm Rockwool Flexi between 140mm solidtimberstud.

• HPDuPontAltguardVCL,25mmbattenedservicezone12.5mmplasterboard.

U-Value =0.25 W/m2K

Construction 1a: I stud 145 x 45 mm• 102mmFacebrick,Standardbreather

membrane 9mm OSB,145mm x 45 I stud• 140mmFlexiinsulationfullyfillingstuds• StandardVCL&12.5mmplasterboard• U-value0.25W/m2K (DittoaboveusingTyvekRolflex breathermembrane)

• U-Value=0.22W/m2K

Timber Construction options using TIMBER I studs 8.3% bridging

Twin skin cladding systems – Roof & Wall

• U-valueexamplebased0.18W/m2K:• Screedon100mmconcreteslabon135mm Rockwool

Rockfloorondpm (Notethicknessbasedondetachedhouse12x8mwithP/A of0.420)insulationthicknesswillvarypendingfloorarea)

Ground Floors

Construction 1: Solid 140mm stud 15% bridging• 102mmFacebrick,TyvekReflexHP

breather membrane 9mm OSB,• 140mmstdTimberframe*,140mm

Rockwool Flexiinsulationfullyfillingstuds.• VCL&12.5mmplasterboard• U-Value =0.25 W/m2K

Construction 2: Solid stud with service zone• 102mmFacebrick,TyvekReflexHP

breather membrane • 120mm stdTimberframe*,120mm Flexi insulationfullyfillingstuds.AirguardHPVCL25mmbattenedservicevoid,.12.5mmplasterboardu-value 0.25 W/m2K

• Dittoaboveusing140mm Flexi in 140mm stud U-Value =0.22 W/m2K

Construction options using Solid timber studs 15% bridging

Roof• Twinskinmetalcladding)

u=0.16 W/m2K• 300-320mmRockwoolCladdingroll(un-faced)

(Buildtypenon-domestic)

Wall• Twinskinmetalcladding)

u=0.25 W/m2K• 180>200mmRockwoolCladdingroll(Foilfaced)

•Thicknessmayvarypendingsystemtype

145


Section 5 – New Build guide solutions

Roof constructions toachieveU-valuesof 0.16 or 0.13 W/m2K

Pitched roofs horizontal insulation

Room in roof – based on U-value 0.16

• Singleplymembrane• 235mm(2layer)Rockwool HardrockDDVCL,onMetaldeck

Flat roofs – based on U-value 0.16

Hybrid Flat roofs U-value = 0.16 (7.8% timber bridging)

• Timberdeck• Singleplymembraneon105mmHardrockonbreathermembraneontimberdeck140mm Rockwool Flexi between joists

• VCLandplasterboardfinish

Hybrid Timber Flat roofs – based on U-value 0.16 (non vented)

• Option1Roll:U-Value=0.16 270mmRockwool Roll(1layerof100mmbetweenjoistsplus1layer170mmRolllaidoverjoists

• Option1a:U-Value=0.14: 200mm Rockwool Rolloverjoists+100mmbetween

• Option1b:U-Value=0.13: 220mm Rockwool Rolloverjoists+100mmbetween

• Option2blown:U-Value=0.16 270mmRockwool RockPrime blown loft insulation

• Option2ablown:U-Value=0.14 310mm Rockwool RockPrime blown loft insulation

• Option2bblown:U-Value=0.13 330mm Rockwool RockPrime blown loft insulation

Pitched roofs horizontal ceiling U value = 0.16 or 0.13 (9% timber bridging)

Room in roof: Insulation @ rafter line U-Value = 0.16 or 0.13 Rockwool Rockfall Warm pitched roof Insulation between & over rafter

• Raftersspaced@600ctrs (7.8%timberbridging)

• Tilesandbattens,breathermembrane, 60mm Rockfall Overlayboardoverrafters

• 200mm Rockwool Flexibetweenrafters, u=0.16standardVCL,.12.5mmp/boardfinish

• 80mm Overlaywith230mm(140+90mm) Rockwool Flexi U-Value = 0.13


Sec

tio

n 5

Minimising Cold Bridging – Extensions & New build

Window & Door Reveals

RockReveal Masonry RockReveal Timber Frame

Rockclose (insulated dpc) Rockclose minimum 20mm thick RW

AccreditedConstructionDetailsguidanceisavailabletoassisttheconstructionindustryinachievingtheperformancestandardsinADL.

Aroundopenings,suchaswindowsanddoors,AccreditedDetailsprovidetheminimumrequirementsarefor:

• Proprietrycloserwithminimumthermalresistance pathof0.45m²K/W.

• Rockwooloffertwoproducttypestoaddress theserequirements:Rockclose insulated dpc and RockReveal

•Both of these products will exceed this performance requirement advocated in accredited construction details

• E.g.20mmthickRockwoolinsultedDPCprovides athermalresistancepathof0.55m²K/Wand0.70m²K/W@25mmthick

Reducesthermalheatloss,condensation&mouldgrowth

Minimising Cold Bridging at Window & Door Reveals

Rockwool Fire rated cavity closers

20mm thick Rockwool insulation

20mm(minimum) thick Rockwool insulation

Tominimiseairleakage,useflexiblesealantaroundinternalandexternalwindowanddoorframesandsills.Ensurethatthevapourcontrollayerandplasterboardarereturnedintoreveal.

Tominimisecoldbridgingandtoprovidefireintegrityatdoorandwindowreveals,fitRockwoolTCBcavityarounddoorandwindowreveals


Section 5 – Extensions guide solutions

External wall construction toachieveaU-valueof0.28W/m2K

• 102mmFacebrick,:• 100mm Rockwool “Cavity”fullfillbatts,• 100mmstd3.6NAircreteblock (Lambda0.150)

• LightPlasterfinish.

• Renderon100mmmediumdenseblock• 95mm Rockwool “Cavity”fullfillbatts,• 100mmstd3.6NAircreteblock (Lambda0.150)

• LightPlasterfinish.

Masonry cavity External Walls:

RockShieldrenderon• 75mm RockShield slab,• 215mmsolidAircreteblock3.6N(0.150)• LightPlasterfinish

BrickShield on• 90mmRockwoolFacadeUltra• 215mmsolidAircreteblock3.6N(0.150)• LightPlasterfinish

Solid Walls

Single Timber framed wall

Withtimbercladdingortilehanging• Cladding,Breathermembrane,9mm

OSB 140mm Rockwool Flexibetween140mmtimberstuds.• STDVCL,25mmbattenedservicezone12.5mmplasterboard.

• Screedon100mmconcreteslabon110mm Rockwool Rockfloorondpm

• (Notethicknessbasedonextensionsizeapprox5mx4m)insulationthicknesswouldbereducediffloorareaof “whole“buildingtakenintoaccount.

Ground Floors U-value 0.22

Awiderrangeofconstructioncanbefound inourGuidetoU-valuesavailablefromour websitewww.rockwool.co.uk/partL


Sec

tio

n 5Roof constructions toachieveU-valuesof0.16or0.18W/m2K

Pitched roofs horizontal ceiling u=0.16 (9%timberbridging)• Option1:270mmRockwoolRoll(1layerof100mmbetweenjoistsplus1Layer170mmRolllaidoverjoists

• Option2:270mmRockwoolRockPrimeblownloftinsulation

Room in roof: Insulation @ rafter line U= 0.18 Rockwool Rockfall Warm pitched roof Insulation between & over rafter• Raftersspaced@600ctrs(7.8timberbridging)• Tilesandbattens,,breathermembrane,70mm RockfallOverlayboardoverrafters,

• 140mmRWFlexibetweenrafters,Standardvcl&12.5mmplasterboardfinish

Pitched roofs horizontal Room in roof

Insulation between rafters only U= 0.18 (7.8%timberbridging)• Tilesandbattens,HPbreathermembrane,200mm(2x100)

Rockwool RWA45 (or 220mm Flexi)betweenrafters,Hpfoilvcl,• 25mmbattenedservicezone,&.plasterboardfinishtorafters.

Roof – Twin skin metal cladding u=0.18 • 260mmRockwool Cladding Roll(un-faced)(Buildtypenon-domestic):• ThicknessmayvarymarginallypendingcladdingsystemtypeWall – Twin skin metal cladding) u=0.28• 150mmRockwool Cladding Roll(Foilfaced)(Buildtypenon-domestic):• Thicknessmayvarypendingsystemtype

Insulation between rafters Twin skin metal cladding – Roof & Wall

Flat roofs u=0.18• Singleplymembraneon210mm(2x105mm)• Rockwool HardrockDDonMetaldeck

Hybrid Flat roofs u=0.18 (7.8%timberbridging)• Singleplymembraneon65mmHardrockonbreathermembraneontimberdeck

• 140mmRockwool Flexi between joists • VCLandplasterboardfinish.

Flat roofs (Metal deck) Hybrid Timber Flat roofs


Section 6 – Insulating Pipes and Ducts

Theinsulationofpipesandductsisessential tominimiseheatlossesforheatedsystemsandheatgainsforcooledsystems.Forcooledsystems,itisalsoimportanttoensurethatthe riskofcondensationisadequatelycontrolled.ThenewApprovedDocumentsADL1A,ADL1B,ADL2AandADL2Brelyon‘second-tier’documentspublishedbyCLGtoprovidedetailedinformationontheminimumprovisionsnecessarytocomplywiththerequirementsoftheRegulations.

ADL1A and ADL1B – DwellingsThe‘DomesticBuildingServiceComplianceGuide(2010)providesguidanceonthemeansofcomplyingwithrequirementsforspaceheatingsystemsandhotwatersystemsinnewandexistingdomesticbuildings.

ADL2A and ADL2B – Buildings other than dwellingsThe‘Non-DomesticBuildingServiceComplianceGuide(2010)providesguidanceonthemeansofcomplyingwithrequirementsforspaceheatingsystems,hotwatersystemsandcooling&ventilationsystemsinnewandexistingnon-domesticbuildings.

The Part L second-tier documents for pipe and duct insulation

Domestic heating compliance guide

CompliancewithapproveddocumentsL1A: newdwellingsandL1B:existingdwellings

ApprovedDocumentsADL1AandADL1B(2010)relyon‘secondtier’documentstoprovidedetailedinformationontheminimumprovisionsnecessary tocomplywiththerequirementsoftheRegulations.

TheDomesticHeatingComplianceGuideisasecondtierdocumentprovidingguidanceonthemeansofcomplyingwiththerequirementsforspaceheatingsystemsandhotwatersystems.

Minimum provisions for insulation of pipes TheminimumprovisionsshownbelowfortheinsulationofpipesarerepeatedintheDomesticHeatingComplianceGuideforfueltypesandheatingsystemsasfollows;• Gas-firedprimaryandsecondaryspaceheatingandhotwater

• Oil-firedprimaryandsecondaryspaceheating andhotwater

• Electricprimaryandsecondaryspaceheating andhotwater

• Solid-fuelprimaryandsecondaryspaceheatingandhotwater

• Communityheating• Solarwaterheating

Minimum provision

Innewsystemspipesshould,inthefollowingcases,beinsulatedwithinsulationcomplyingwiththerequirementsoftheDomesticHeatingComplianceguide(inlinewiththemaximumpermissibleheatlossindicatedintheSupplementaryInformationcolumn),andlabelledaccordingly:• Primarycirculationpipesforheatingandhotwatercircuitsshouldbeinsulatedwherevertheypassoutsidetheheatedlivingspaceorthroughvoidswhichcommunicatewithandareventilatedfromunheatedspaces

• Primarycirculationpipesfordomestichotwatercircuitsshouldbeinsulatedthroughouttheirlength,subjectonlytopracticalconstraintsimposedbytheneedtopenetratejoistsandotherstructuralelements

• Allpipesconnectedtohotwaterstoragevessels,includingtheventpipe,shouldbeinsulatedforatleast1mfromtheirpointsofconnectiontothecylinder(ortheyshouldbeinsulateduptothepointwheretheybecomeconcealed)

• Ifsecondarycirculationisused,allpipeskepthotbythatcirculationshouldbeinsulated

Forreplacementsystems,wheneveraboilerorhotwaterstoragevesselisreplacedinanexistingsystem,anypipes(inthesituationsabove)thatareexposedaspartoftheworkorareotherwiseaccessibleshouldbeinsulatedwithinsulationcomplyingwiththerequirementsoftheDomesticHeatingComplianceguide(inlinewiththemaximumpermissibleheatlossindicatedintheSupplementaryInformationcolumn),andlabelledaccordingly–ortosomelesserstandardwherepracticalconstraintsdictate.


Sec

tio

n 6

Table 2: Maximum Permissible Heat Loss (W/m) (Thickness of Rockwool Rocklap H&V Pipe Section)

Pipe Outside Diameter (mm)

Hot Water1 Low Temp. Heating2

≤ 95°CMedium Temp Heating3

96°C – 120°CHigh Temp Heating4

121°C – 150°C

17.2 6.60 (25mm) 8.90 (25mm) 13.34 (25mm) 17.92(25mm)

21.3 7.13(25mm) 9.28 (30mm) 13.56 (30mm) 18.32 (30mm)

26.9 7.83(30mm) 10.06 (35mm) 13.83 (40mm) 18.70(40mm)

33.7 8.62 (30mm) 11.07(35mm) 14.39 (45mm) 19.02 (50mm)

42.4 9.72(30mm) 12.30 (35mm) 15.66 (50mm) 19.25 (60mm)

48.3 10.21 (35mm) 12.94 (40mm) 16.67(50mm) 20.17(70mm)

60.3 11.57(35mm) 14.45 (40mm) 18.25 (60mm) 21.96 (70mm)

76.1 13.09 (35mm) 16.35 (45mm) 20.42 (60mm) 24.21 (80mm)

88.9 14.58 (35mm) 17.91(45mm) 22.09 (60mm) 25.99 (80mm)

114.3 17.20(40mm) 20.77(45mm) 25.31 (70mm) 29.32 (80mm)

139.7 19.65 (40mm) 23.71(50mm) 28.23 (70mm) 32.47(90mm)

168.3 22.31 (40mm) 26.89 (50mm) 31.61 (70mm) 36.04 (90mm)

219.1 27.52(40mm) 32.54 (50mm) 37.66(70mm) 42.16 (90mm)

273.0&above 32.40 (40mm) 38.83 (50mm) 43.72(80mm) 48.48 (100mm)

NOTES1,2,3,4Toensurecompliancewithmaximumpermissibleheatlosscriteria,proposedinsulationthicknesses shouldbecalculatedaccordingtoBSENISO12241usingstandardizedassumptions: 1Horizontalpipeat60°Cinstillairat15°C 2Horizontalpipeat75°Cinstillairat15°C 3Horizontalpipeat100°Cinstillairat15°C 4Horizontalpipeat125°Cinstillairat15°CDueto‘roundingup’tothenearestcommerciallyavailablethickness,thethermalperformancerequiredwillbe metorexceeded.

Maximum permissible heat loss (W/m) for direct hot water and heating pipes. Table41section11ofBuildingservicescomplianceguide(2010Edition).

Non-domestic heating, cooling and ventilation compliance guide

CompliancewithapproveddocumentsL2A:NewBuildingsotherthanDwellingsandL2B:ExistingBuildingsotherthanDwellings

Pipework and duct insulation

ApprovedDocumentsADL2AandADL2Brelyon‘second-tier’documentstoprovidedetailedinformationontheminimumprovisionsnecessary tocomplywiththerequirementsoftheRegulations.

The‘Non-Domesticisasecond-tierdocumentprovidingguidanceonthemeansofcomplyingwiththerequirementsforspaceheatingsystems,hotwatersystems,coolingandventilationsystems.

Section11oftheNon-domesticBuildingServicesComplianceguide2010outlinestheminimumprovisionsneededtocomplywithADL2AandADL2Bwheninsulatingpipesandductsservingspaceheating,hotwaterandcoolingsystemsinnew-buildandinexistingbuildings.

Theinsulationofpipesandductsisessentialtominimiseheatlossesforheatedsystemsandheatgainsforcooledsystems.Forcooledsystems,itisalsoimportanttoensurethattheriskofcondensationisadequatelycontrolled.AlthoughnotwithinthescopeoftheNon-domestic,guidanceoncontrollingcondensationisalsoprovidedinAnintroductiontoPartL–insulatingpipesandducts.a directhotwaterpipesandlow,medium &hightemperatureheatingpipesb cooledwatersupplypipesc heatedairducts,cooledairductsand dual-purposeheated&cooledairductsd condensationcontrol


Section 7 – BuildDesk Part L 2010 Solutions

BuildDeskisanindependentproviderofenergydesignsoftware,servicesandconsultancyinthefieldofenergyefficiency.OurproductsaredesignedtohelpArchitects,engineersandbuildingdesignersmeetandexceedtherequirementsofthenewApprovedBuildingRegulationPartL(2010)documents.

BuildDesk Software toolsOuruserfriendlysoftwaretoolsaredesignedto allowyoutoquicklycheckyourdesignproposals andgeneratesupportingreportsforBuildingControl.Oursoftwaretoolsinclude:

BuildDesk U OureasytouseU-valuecalculatorhelpsyoutobuildupyourownconstructionsandcheckthemin2D&3D.Withover500genericconstructionsandacomprehensivelistofconstructionmaterialstochoosefrom,youcanquicklyproduceaccurateU-valuecalculations.ItcomeswithanintegratedCondensationRiskanalysiscalculatorwhichhelpsyoutoassessmentyourconstructionsforinterstitialandsurfacecondensationrisk.Newforthelatest2010regulations,BuildDeskUnowcomescompletewithanautomaticHeatcapacitycalculationofyourconstructions.HeatcapacitiesarenowanimportantrequiredinthelatestSAP2009&SBEMcalculationswheretheyareusedtoestablishtheeffectivethermalmassofyourbuilding.

BuildDesk Carbon CheckerCarbonChecker,ouralternativetoiSBEM,isdesignedfornewandexistingnon-domesticbuildings.Thispowerfuldesigntoolallowsyoutodrawin,ortracethebuildinggeometryfromyourCADdrawingsandmakequickchangestothedesign.CarbonCheckerismuchmoreuserfriendlyandusefulwhencarryingoutrapidassessmentsofbuildingsforBuildingRegulations,fromdesignsubmissionstoas-built,includingthefinalEnergyPerformanceCertificate.

Alloursoftwareproductsareavailableforafreetrial.Justvisitthe‘oursoftware’sectionourwebsiteatwww.builddesk.co.uk.

BuildDesk Services & ConsultancyAsacomplementtooursoftwaretoolsweofferarangeofservicesfromcalculationassistanceincludingthermalbridginganalysis;tohands-onsoftwaretrainingcoursesandCPDaccreditedseminars.

More InformationTokeepuptodatewithBuildingRegulations,developmentsinsustainableconstructionandthelatestnewsonforthcomingBuildDeskproductsandservicesvisitusonlineatwww.builddesk.co.ukandregisterforourNewsletter.

BuildDesk–amemberoftheRockwoolGroup.


Section 8 – About Rockwool

Sustainability

Rockwoolreliesonnaturallyoccurringentrappedairforitsthermalproperties.IthasneverusedozonedepletingsubstancesorgaseswithahighGlobalWarmingPotentialinitsmanufactureaccordingtoTheEnvironmentalProtection(ControlsonOzone-DepletingSubstances)Regulations2002.

RockwoolLtdisincreasinglyinvolvedinrecyclingwasteRockwoolmaterialthatmaybegeneratedduringinstallationoratend-of-lifedisposal,andhasarecyclingschemethatisrecognisedbyWRAPandtheEnvironmentAgency.

Continuing Professional Development (CPD)

RockwoolpersonnelaretrainedtoprovideavarietyofCPDpresentationsonarangeofsubjectsincluding therecentchangestoPartLofthebuildingRegulations.PleasecontactourCustomerServicesdepartment on08712221780forfurtherdetails

Rockwool

Rockwoolistheworld’slargestproducerofstonewoolinsulationandthesecondlargestinsulationproducerglobally.ThegrouphasannualsalesofEuro1.5billionandemploysover7,800staffinmorethan30countries.Ithas22factoriesaroundtheworld.

Rockwoolinsulationiscreatedfromnaturallyoccurringvolcanicdiabaserockwiththeoresmeltedandspunintofibrestocreateawiderangeofinsulationmaterials,rangingfromloftinsulationrollstoimpact-resistantroofingboards.Itisalsobondedtoproducehighperformancepanels.

Rockwoolprovidesafour-in-oneinsulationsolution,providinghighgradethermalinsulation,noiseinsulation,non-combustibleandstrongenvironmentalcredentials.Rockwoolinsulationisoneoffewproductsthatcansavemorethan100timestheenergyusedforitsmanufacture.Rockwoolinsulationisalsorecyclableandcanbere-smeltedandspunintonewstonewoolinsulationrollsandpanels.

Technical Support

OurtechnicalteamcanprovideexpertpracticaladviceonRockwoolproductsandsolutions,including:

• technicalspecificssuchasU-valuecalculation,condensationriskandrainnoise• productselection• installationguidance• acousticinformation• passivefireprotection• meetingBuildingRegulations

PrintedonFSCpaper.Pleasereuseandrecyclethisdocument.

Digitallyprinted,inshortprintrunstominimisetheeffectontheenvironment.

AvailableasaPDFdocument.

Rockwool Limited

Pencoed Bridgend CF356NY

www.rockwool.co.uk©CopyrightRockwoolSeptember–2010

Contact us

Forallgeneralortechnicalqueriesplease contactusat:

Tel: 0871 222 1780 Email:[email protected] Web: www.rockwool.co.uk

ByPostto: RockwoolLimited Pencoed Bridgend CF356NY UK