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