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NAFSStarttoFinishFenestrationManitoba– FenCon17PanelDiscussion
DaveGoldsmith(PlyGem),ElieAlkhoury(CAN-BESTBuildingSciences)February10,2017
WhatChangedfromA440-00toNAFS?
Ø A440-00hadstandardspecimensizes
Whataboutlargersizedwindows?
ØTherewasnoguidanceonhowtoemploycalculations.ØTherewerenoreferencedstandards.ØManufacturersdidnotbotherwithit.ØTherewasnoenforcement.
WhatweretheA440-00performancerequirements?
Ø A/B/CRatingSystemØ A440.1-00UsersSelectionGuide
toA440-00couldbeusedtospecifysite-specificrequirements
Ø ThemaximumrequirementforsmallbuildingswasA3/B3/C3,sonobodyusedtheGuide.
LabelingunderA440-00:TypicalWindowBannerØ Notproductsizespecific,
ratingsweregivenforthestandardsizes.
Ø ViewedasanapplestoapplescomparisonlikeUvalues
Ø Alloftheratingsforthemanufacturersproductlinesweregivenononelabel.
Ø A3/B3/C3=OK
UnitsizesinNAFS
• Testthelargestwidthandlargestheightforwhichaperformanceratingisrequired.• Testresultsarevalidonlyforproductsuptoandincludingthewidthandheightofthespecimen
tested-exceptAAMA2502andWDMAI.S.11allowdifferentsizesbycalculation–andprovideguidancehow.
• SimilarwordingtoA440-00.Whatchanged?
NBC2010CodeLanguage
BringstotheattentionofSCO’stherequirementtoselectperformancegradesappropriatetothesitespecificconditionsusingA440S1CanadianSupplement,andtolabeltheindividualunitperformanceasmeetingtherequirement.
TheCanadianSupplement:
Ø ProvidesthemethodofselectingNAFSPerformanceGradesandWaterResistance
Ø NoperformancecaplikeA3/B3/C3Ø DescribessomeCanadianspecific
labelingrequirements
FromA440S1-09CanadianSupplementtoNAFS
FromNAFSClause4.4.3- SizeTestedmustbeonthelabel:
Ø MostmanufacturersnowchoosetoputtheirunittypeandsizespecificNAFSratingsatthebottomofthelabelwiththeunittypespecificEnergyPerformanceRatings.
Ø GuidanceonlabelingformatscanbefoundintheFenestrationCanadapublications:§ NAFSLabelingGuidelinesforCanada§ VoluntaryNAFSLabelingGuidelinesforProducts
withMullions
NewNAFSLabeling:
Whataboutmullions?A440-00said:
ØTherewasnoguidanceonhowdemonstratethatthemullionshavesufficientstrengthandstiffness,andnoreferencedstandards.
ØAmanufacturermightsaytothemselves“weneverhadamullionbreakinservice,thatdemonstratesit”.
ØTherewasnomullionlabelingorenforcement.
Thiscanbeaproblem.Whatdoesalargemulti-liteunitwithunreinforcedmullionslooklikeinatestlab?
Unreinforced4-waymulltestedatthelowestdeflectiontestpressureinNAFSofDP15(15psf).Deflected3”oncenter. Sixlitetestedat20psf
TheminimumNAFSstructuraltestpressureforPG15is22.5psf.
Testedtofailure(permanentdeflectionafterSTP)theseunitsareactuallyPG=0
NAFSinsiststhatthestructuralratingsofproductswithmullionsmustbebasedontheactualperformanceofproductswithmullions.
NAFS-08givesnoguidanceonmullionlabeling.
NAFS-11hasthis:
FenestrationCanadaNAFSLabelingGuidelinesforProductswithMullions
VoluntaryNAFSLabelingGuidelines:• Voluntary becausethecodeonlyrefersto
NAFS andtheCanadianSupplement• Neithergiveadequateguidanceregardinghow
toproperlylabelmulledproductperformance.• TheFenCanguidelinesareintendedtohelp
bothindustryandbuildingofficialsappreciatetheneedtolabelmulledproductperformance,andillustratepracticalwaysofdoingsoforbothassemblytypes:• CompositeUnits• CombinationAssemblies
CombinationAssemblies:
Ø CombinationAssembliesconsistoftwoormoreseparateproductsthataremulledtogetherwithaCombinationMullionorReinforcingMullion.
Ø Theconstructionoftheindividualunitswithintheassemblyarethesameastheindividualunitstestedseparately,soitisnotnecessarytoretesttheindividualunitperformanceinthecontextoftheassembly– theyareassumedtohavethesameperformance– providedtheL/175deflectionlimitisappliedtothemullions.
CompositeUnits:
Ø CompositeUnitsutilizeintegralmullionswithinasingleframe.Ø Thiscreatesnewframingmembersandconnectionsthatdon’texistintheindividualunitsthatwere
testedseparately.Theseneedtobevalidatedbytesting.Ø Testingallthepossibleconfigurationsandsizeswouldnotbefeasible,soEngineeringisallowed
Ø ThisisexplicitlystatedinNAFS-11,butnotNAFS-08
NAFSREFERENCEDSTANDARDSforEngineering:
AAMA2502andWDMAI.S.11:
TotalProductComparativeAnalysis(AAMA2502andWDMAI.S.11):• Allowsinterpolationbetweentwoormorewholeproductspecimentests
toarriveatDPratingsforsizesthathavenotbeentested.• ThesmallerunitstypicallygetahigherDPandlargerunitsalowerDP.• Interpolationallowssize-specificDPvaluesforin-betweensizedunits
withouthavingtotestawholerangeofsizes.
TotalProductExtrapolationAnalysis(WDMAI.S.11):• AllowsratingsforFixedunitslargerthanthesizetested,providedthe
glassedgeloaddoesnotincreaseandfastenerschedulesaremaintainedincomparisontothetestedspecimen(s).
AAMA450PerformanceRatingMethodforMulledAssemblies
ThewordingofNAFSmakesitunclearwhatEngineeringmethodscanbeusedonCompositeUnits.TheAAMADocumentManagementCommitteeisworkingchangingAAMA450tobringCompositeUnitsfullywithinit’sScope.
WhatdoesatestprogramforCombinationAssemblieslooklike?
Ø TheCasementUnitTypeandFixedUnitTypeweretestedseparatelyasindividualunitsandhavebeenjoinedwithareinforcingmullion.
Ø Iftheframejointsandconnectionsinthemulti-liteunitsarethesameasintheindividualunits,thereisnoneedtoretesttheindividualunitsinthecontextoftheassemblywhenusingOptions#2and#3underAAMA450,providedtheL/175deflectionlimitisapplied.
Forexample,asingleverticalslidermulledtoitself:
Ø Ifthereinforcingmulldoesnotaffecttheconnectionoftheinterlocktotheframethenthereisnoneedtotestthisjointinassociationwithamullion.
Ø However,ifitisnecessarytocounter-sinktheinterlockattachmentscrewswheretheywillbeadjacenttothemullionthenthejointhaschangedandmayneedtobeanalyzedand/ortested.
WhatdoesatestprogramforCompositeUnitslooklike?
Ø CompositeUnitsutilizeintegralmullionswithinasingleframe.Ø Thiscreatesnewconnectionandjointtypesthatdon’texistintheindividualunitsthatwere
testedseparately.Ø Theseneedtobevalidatedbytesting.
Forexample:
Ø Thesejointswillusuallybedifferent,becausescrewingthroughaframeintoaT-BarwillusuallydifferfromscrewingthroughaT-BarintoaT-Bar.
Ø Inthefour-wayconnection,youcanonlyscrewthroughonesideintothefirstT-Bar.ThesecondT-Barwillneedtobemountedwithbrackets.
Ø Ifthedesignusesthesameconnectiontype(brackets,welding)inalljointsthismaynotbeaconcern.
Eachuniqueframingmember,intermediatemember,connection,sealingdetailanddrainagesysteminacompositeunitdesignshouldbetested.ØWhatkindofcompositeunitconfiguration(s)wouldneedtobetestedtodothis?
ØHowcantheresultsfromtestunitconfigurationsbeusedtovalidateuntestedconfigs?• Strengthofintermediatememberconnections• Maximumbendingmoment• Maximumshear• Maximumdeflection