15LL11 Practical Code Compliant Detailing for Mid-Rise ... · PDF file• Structural Design...
Transcript of 15LL11 Practical Code Compliant Detailing for Mid-Rise ... · PDF file• Structural Design...
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Practical,Code-CompliantDetailingforMid-RiseWoodStructuresDetailingConsiderationsforMidRiseWoodFrameBuildings
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“TheWoodProductsCouncil”isaRegisteredProviderwithTheAmericanInstituteofArchitectsContinuingEducationSystems(AIA/CES),Provider#G516.
Credit(s)earnedoncompletionofthiscoursewillbereportedtoAIACESforAIAmembers.CertificatesofCompletionforbothAIAmembersandnon-AIAmembersareavailableuponrequest.
ThiscourseisregisteredwithAIACESforcontinuingprofessionaleducation.Assuch,itdoesnotincludecontentthatmaybedeemedorconstruedtobeanapprovalorendorsementbytheAIAofanymaterialofconstructionoranymethodormannerofhandling,using,distributing,ordealinginanymaterialorproduct.________________________________Questionsrelatedtospecificmaterials,methods,andserviceswillbeaddressedattheconclusionofthispresentation.
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CourseDescription
Withanincreaseinmid-risewood-framebuildings,moredesignersareseekinginformationoncode-compliantandconstructibledetailing.Manyareunsureofthecode’srequirementsfordetails,specificallyattheintersectionofratedassembliesandwherestructureandfireprotectionmeet.Thispresentationwillfocusoncommondetailingissuesandareasofmisunderstanding—includingfire-resistanceratingcontinuity,allowableusesofwoodframinginshaftandfirewalls,andfiresafetyprinciplesassociatedwiththeintersectionoftworatedassemblies.Mid-risewood-frameopportunitiesandcode-specifiedbuildingsizeswillalsobereviewed,followedbydiscussionofdetailingcoderequirements,codecompliance,andrationaleforapprovalwithanemphasisonconstructabilityandpracticality.
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LearningObjectives
1. Discussallowableconstructiontypes,occupancies,andbuildingheightsandareasforwood-framemid-riseconstructionpertheInternationalBuildingCode.
2. Examineavarietyoffloor-to-exteriorwalldetailsforuseinwood-frame,TypeIIIconstructionanddiscusscodecompliancepathsandapprovalrationaleforeach.
3. Discusscode-permittedshaftwallandfirewallconstructionmaterialsandfire-resistancerequirements,andreviewcommondetailsforeach.
4. Considercodeprovisionsforcorridorandbalconyfire-resistanceprotection,andidentifydetailsthataccommodatetheserequirementswhilemaximizingwooduse.
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Outline
• Mid-RiseConstructionTypes&LifeSafetyReview• StructuralDesign&DetailingConsiderations• ShrinkageConsiderations&Detailing• AcousticRequirements&Detailing• FireResistiveRequirementsandDetailing
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Mid-RiseConstructionTypes
Materials ProtectedElements
LessProtectedElements
UnprotectedElements
Non-Combustible IA,IIA IB IIB
Combustible - - -
Mixed Systems IIIA IIIB -
HeavyTimber - IV -
AnyMaterials VA - VB
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ICCBuildingValuationData
80
90
100
110
120
130
140
150
160
IA IB IIA IIB IIIA IIIB VA VB
$pe
rSqu
areF
oot
IBCConstruction Type
InternationalCodeCouncil,August2015DataR-2Occupancy
PrimaryStructuralWoodFramingAllowed
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IBCBuildingSizeLimits
Construction TypeAllowableLimit
IIIA IIIB VA VB
Stories 4 4 3 2Height(ft) 65 55 50 40BuildingArea/Story(ft2) 24k 16k 12k 7kTotalBuildingArea*(ft2) 72k 48k 36k 14k
IBC2012Table503TabularValues
Residential(R1,R2,andR4)Occupancies
*Assumingmaxstoriesbuilt
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IBCBuildingSizeLimits
WithNFPA13Sprinklers:IBCgivesanallowableHeightsandAreaIncrease
IIIATabularHeightLimits IncreasedLimits
NFPA13
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IBCBuildingSizeLimitswithSprinkler
TypeIIIAConstructionAllowableLimit
Table503
Stories 4Height(ft) 65BuildingArea/Story(ft2) 24kTotalBuildingArea*(ft2) 72k
Residential(R1,R2,andR4)Occupancies
*AssumingmaxstoriesbuiltperIBC506.4
503
NPFA13
58524k72k
504.2IBC2012Section
NPFA13
58572k216k506.3
Frontage**
58590k270k506.2
**Maximumfrontageincreasepossible
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StellaApartmentsLocation:MarinaDelRay,CA244Apts.,650Ksf total(2bldgs)TypeIIIAandVAconstructionPanelizedwoodframingsaved1-2monthsconstructiontimeand$200,000
CaseStudy:StellaApartments
Architect:DesignARC.LosAngeles,CAPhotos:LawrenceAnderson,www.lawrenceanderson.net
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Outline
• Mid-RiseConstructionTypes&LifeSafetyReview• StructuralDesign&DetailingConsiderations• ShrinkageConsiderations&Detailing• AcousticRequirements&Detailing• FireResistiveRequirementsandDetailing
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Structural• Directbearing/noadd’l
hardware• Mayrequireloadtransfer
blockingforconcentratedloadsfromabove
• Wallsoleplateandfloorsheathingcrushingmayneedtobeconsidered
Constructability• Framingcanbecompletedbefore
drywallandinsulationareinstalled
• Commonlengthstuds
PlatformFraming
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Semi-balloonFraming
Structural• Additionalhardware/nodirect
bearing• Noloadtransferblockingreq’dRatedAssemblies• Mayaccommodatecontinuity
inexteriorwallsinTypeIIIconstruction
Constructability• Framingcanbecompleted
beforedrywallandinsulationareinstalled
• Customlengthstuds• Canhelpminimizebuilding
shrinkage
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ShearWallFramingConsiderations
TypicalFloorPlanShearWallLayoutIndicateswoodsheathedshearwall
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ShearWallFramingConsiderations
• Typicalfloorplanresultsinshortersolidwallsections,offsetwalls,needformorecollectors,struts
• Shorterwalls=higherconcentratedloads• Higherconcentratedloads=tighternailing,largerholddowns&
endposts,possiblydoublesidedsheathing• Coderequirementsforwallheighttowidthratiosmustbemet• Accumulatedloadsfurtherconcentrateforcesinlowerlevel
walls
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ShearWallFramingConsiderations
• Shearwallcomponentscanaffectotherbuildingfeatures
• EndPosts:Morewoodinwall=lessinsulation
• Sheathingoninteriorwallsaffectwallfinishes,acoustics
• Holddowns,endposts,blockingcanaffectin-wallutilities
• OpeningsinwallsforMEPcanaffectshearwallstrength
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ShearWallConfigurationOptions
SolidorSegmentedWalls
PerforatedWallsForceTransferAround
OpeningsWalls
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ShearWallHoldDownOptions
StandardHoldDownInstallation StrapHoldDown
Installation
……
……
……
…
Continuous Rod - Automatic Tensioning Systems
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DiaphragmConsiderations
TypicalFloorPlanDiaphragmLayout
Open
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DiaphragmConsiderations
• Typicalfloorplanresultsindiaphragmoffsets,re-entrantcorners,discontinuities,openings
• Diaphragmopenings,discontinuities=higherconcentrated,localizedloads
• Higherconcentratedloads=tighternailing,largerchord&strutloads,mayrequireblockeddiaphragm
• Coderequirementsfordiaphragmlengthtowidthratiosmustbemet
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ShearWalltoPodiumSlabInterface
• AmplificationofseismicforcesisrequiredforelementssupportingdiscontinuouswallsperASCE7-1012.3.3.3
• Overstrength factorof3(maybereducedto2.5perfootnotegofTable12.2-1)isrequired
• AttachmenttoconcreteslabmustalsoconformtoACI318AppendixD
• TypicallywillbetransitioningfromASDforwooddesigntoLRFDforconcretedesign
• Holddownattachmentstoconcreteoptions:embeddednutsorplates,sleevesthroughslab,weldedstuds&reinforcing
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PTSolePlatevs FRTContinuity
IntypeIIIconstructionwithFRTstuds,whathappenswherethesoleplateisincontactwithconcrete?
• FRTWisrequired• PTwoodisrequiredFRTcontainsabout10xboratecompoundfoundinPT(borateiswatersoluble)Canspecifyaproducttestedtodoboth
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Outline
• Mid-RiseConstructionTypes&LifeSafetyReview• StructuralDesign&DetailingConsiderations• ShrinkageConsiderations&Detailing• Concepts• Calculations• Recommendations
• AcousticRequirements&Detailing• FireResistiveRequirementsandDetailing
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IBC2012onShrinkage2304.3.3Shrinkage.Woodwallsandbearingpartitionsshallnotsupportmorethantwofloorsandaroofunlessananalysissatisfactorytothebuildingofficialshowsthatshrinkageofthewoodframingwillnothaveadverseeffectsonthestructureoranyplumbing,electricalormechanicalsystems,orotherequipmentinstalledthereinduetoexcessiveshrinkageordifferentialmovementscausedbyshrinkage.Theanalysisshallalsoshowthattheroofdrainagesystemandtheforegoingsystemsorequipmentwillnotbeadverselyaffectedor,asanalternative,suchsystemsshallbedesignedtoaccommodatethedifferentialshrinkageormovements.
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KeyFactorsInfluencingShrinkage
• Pre-constructionmoisturecontent(MC)• In-serviceequilibriummoisturecontent(EMC)• Cumulativethicknessofcross-grainwood
contributingtoshrinkage
Woodspecieshasrelativelylittleimpactsincemostspeciesusedincommercialconstructionhavesimilarshrinkageproperties.
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Moisturechangescausedimensionalchangesperpendiculartograin
Growingtreeisfilledwithwater
Aswooddries,itshrinksperp.tograin
BasicWoodShrinkageTheory
Image:WoodHandbook,WoodasanEngineeringMaterial,USDAForestService,ForestProductsLaboratory,2010
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Wider&Thicker--- NOTTaller
ShrinkageinlumberexpectedACROSSthegrain.Longitudinalshrinkageisnegligible.
BasicWoodShrinkageTheory
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BasicWoodShrinkageTheory
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ZoneofMovementShrinkageoccursprimarilyinhorizontalmembers• Wallplates• Floor/rimjoists
Beawareofcumulativeshrinkage.
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Pre-ConstructionMoistureContent
Mi=19%Mi=28%
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MinimizeConstructionMoistureAccumulation
1. Minimizestorageofmaterialonsitewhererainandstandingwatercanincreasemoisturecontent.
2. Keepunusedframingmaterialcovered3. Inspectpre-builtwallpanelspriortoinstallationforproper
materialandqualityofmechanicalfasteners.4. “Dry-in”thestructureasquicklyaspossible.5. Immediatelyremoveanystandingwaterfromfloorframing
afterrainshowers.6. EnsurethatinstalledlumberMCisloweredto19%or
calculatedmaxMCbeforeinstallingfinishes&insulation
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In-serviceAverageEMCinJuly
34
Map courtesy of US Forest Products Laboratory
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In-serviceAverageEMCinJanuary
35
Map courtesy of US Forest Products Laboratory
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ComprehensiveShrinkageEstimation
ForachangeinMCbetween 6%and14%theshrinkageformulais:
( )[ ]iFTi MMCDS −=
CalculatingShrinkage
S=shrinkage(ininches)
Di =initialdimension(ininches)
CT /CR=dimensionchangecoefficient,tangential/radialdirection
CT =0.00319forDouglasFir-LarchCT =0.00323forHem-FirCT =0.00263forSpruce-Pine-FirCT =0.00263forSouthernPine
MF =finalmoisturecontent(percent)
Mi =initialmoisturecontent(percent)
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ComprehensiveShrinkageEstimation
ForMCoutside therangeof6to14%:
( )
iT
iFi
MS
MMDS
+−
−=
30)100(30
CalculatingShrinkage
S=shrinkage(ininches)
Di =initialdimension(ininches)
ST /SR=tangential/radialshrinkage(%)fromgreentoovendry
MF =finalmoisturecontent(percent)
Mi =initialmoisturecontent(percent)
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CalculatingShrinkage– Resources
WoodHandbook:www.fpl.fs.fed.us• Chapter13– CT,CR• Chapter4– ST,SR
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ExampleShrinkageCalculation
Assume:S-DrylumberFind:ShrinkageinPlates&FloorJoist
ShrinkageZone:2x4UpperPlate2x12FloorJoist4x4LowerPlate16.25”Total
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QuickShrinkageEstimation:
AgainassumingtheinitialMC(Mi)is19percentandthefinalMC(MF)is12percent
Ourapproximatedshrinkageis:
ForDougFirLarch:
ForS-P-ForSouthernPine:
S =CDi MF −Mi( ) = 0.00319×16.25 12−19( ) = −0.36inch
ExampleShrinkageCalculation
S =CDi MF −Mi( ) = 0.00263×16.25 12−19( ) = −0.3inch
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MinimizingShrinkage
Semi-balloonframing• incorporatesfloorframing
hangingfromtopplates• Eliminatestangential
shrinkageinzoneofmovement
• Floorframingdoesn’tcontributetooverallbuildingshrinkage
Non-standardstudlengthsandincreasedhardwarerequirementsarearesult.
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ExampleShrinkageCalculationAssume:S-DrylumberFind:Shrinkagein2x4UpperPlate&4x4LowerPlate
ShrinkageZone:2x4UpperPlate4x4LowerPlate5”Total
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QuickShrinkageEstimation:
AgainassumingtheinitialMC(Mi)is19percentandthefinalMC(MF)is12percent
Ourapproximatedshrinkageis:ForDougFirLarch:
ForSouthernPine:
S =CDi MF −Mi( ) = 0.00319×5 12−19( ) = −0.11inch
ExampleShrinkageCalculation
S =CDi MF −Mi( ) = 0.00263×5 12−19( ) = −0.09inch
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DifferentialMovement
Movementbetweenwoodframeelementsandothermaterialsthat…
• donotshrinkatall
• shrinkmuchless
• expand
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Shrinkage&FinishConsiderations
Largeexpansesofinteriorandexteriordrywall,panelingandsidingneedtobelookedatspecifically.
Employexpansionjointandslip-typedetailing.
Attentiontointeractionofstructural(load-bearing)andnon-structuralelementsisnecessary
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Shrinkage&MEPConsiderations
FullycompresswallframingbycompletingalldeadloadpotentialPRIORtomechanicalinstallations.
Avoidrigidverticalpipinginmechanicalandplumbingsystems.Flexiblemembersallowforshrinkagebetweenfloors.
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MEPConsiderations
Verticalventstacksshouldbeinstalledaftercompletionofframing.
Ventstacksrequirespecialattentionandmustbedesignedtoallowforverticalmovementduetoshrinkagebetweenfloors.
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MEPJointOptions
AvarietyofexpansionorslipjointconnectorsareavailablewhichaddressthisissueandallowverticalmovementinMEPitemsduetobuildingshrinkageand/orthermalchangewithoutcausingdamagetothem
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BrickFaçade:Solution1- PlainUnreinforcedBrick-h>30’
Allowsforverticalshrinkageofwoodframing
VeneermustbedesignedperACI530section2.2asplainunreinforcedmasonry
Anchors/tiestobespacedamaximumof32”o.c.horiz.And18”o.c.vert.(exceptseismic)
Requiressteellintelatopenings
Jointsmustallowforalldifferentialmovement(lateraldriftandvertical shrinkageofwoodFramingEtc.).WeightofbrickmustnotbesupportedbywoodFraming
Woodbackerstuds
Brickgoesintoflexurewhenwallstudsdeflect
DesignmustbeinstrictconformancewithACI530section6.2.1-Alt.designmethod(engineered)
Designtosection2.2(ASD)or3.2.2(strength)unreinforcedmasonry
Brickveneermustbeselfsupportingandnotsupportedoffofthewoodframing
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BrickFaçade:Solution2- StructuralReinforcedBrick
BrickunitsaresimilartoCMU’swhereverticalandhorizontalreinforcingcanbeinstalled• Veneerspansfloortofloor
withouttransferringloadstowalls.
• Loadsaredumpeddirectlyintofloordiaphragms
• Steellintelsoveropeningsarenotrequired
• Intermediateanchors/tiesarenotrequired
• Wallspansvert.&horiz.Betweenspacedanchors
Reinf.horizontalbondbeamorlintelunitsoveropenings
Spacedanchorsmustallowforalldifferentialmovement(lateraldrift,vertical shrinkageofwoodFraming,etc.).WeightofbrickmustnotbesupportedbywoodFraming
Woodbackerstuds
Reinforcementreducesexpansionandcracking
Anchors/tiesaretieddirectly intofloordiaphragms
Veneeractsascompleteunit,notasindividualSegments.Supportsselfweightplusout-of-planeloads
#3or#4rebar (typ.)
Heavieranchorsarenotaspronetofiredamage
4”nom.orgreater
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FaçadeConsiderations- Resourceswww.woodworks.org
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FaçadeConsiderations- Resources
BrickIndustryAssociation–www.gobrick.com
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DoorandWindowConsiderations
Sealantjointsizedtoallowshrinkageofwoodframeandexpansionofbrick(typically¼”to½”perfloor)
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DoorandWindowConsiderations
FlashingandCounterFlashingDetailedtoProvideVerticalFlashingSlipJointtoAccommodateMovement
Source:FPInnovations
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DoorandWindowConsiderations
Gapunderflashingallowsverticalmovement
Source:CENews,Feb2014
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DoorandWindowConsiderations
Source:CENews,Feb2014
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ShrinkageEffectsonStructuralComponents
Strapholddownscanbucklewithtoomuchaccumulatedmovement.
Anchortypeholdownsshouldre-tightenedbeforeinstallingfinishes.
Threadedrodholdownswithshrinkagecompensatingdevicesworkwellfor4storiesandabovewithstackingunits.
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Shrinkage&DeckConsiderations
WhitePaper:Multi-StoryWood-FrameShrinkageEffectsonExteriorDeckDrainage:ACaseStudybyZenoMartin,WoodDesignFocusFall2010
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ShrinkageMitigatingDetailingTips
Bestpracticestomitigatedistresstofinishesarisingfromcumulativedifferentialmovement:• Beacutelyawareofthefactthattherewillbedifferentialmovement• Addressitindetailingandspecifications• Considerwheredistresswilloccur• Providedetailstorelieveoravoidit
Architects:CooperCarry&ThePrestonPartnershipPhoto:AerialPhotographyInc.
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ShrinkageResources– www.wwpa.com
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Outline
• Mid-RiseConstructionTypes&LifeSafetyReview• StructuralDesign&DetailingConsiderations• ShrinkageConsiderations&Detailing• AcousticRequirements&Detailing• FireResistiveRequirementsandDetailing
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BuildingAcousticsOverview
Air-bornesound:• SoundTransmissionClass
(STC)Measureshoweffectivelyanassemblyisolatesair-bornesoundandreducesthelevelthatpassesfromonesidetotheother
Structure-bornesound:• ImpactInsulationClass
(IIC)Evaluateshoweffectivelyanassemblyblocksimpactsoundfrompassingthroughit
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AcousticalCodeRequirements
IBCSection1207:
Min.STCof50(45iffieldtested)for:• AllWalls,Partitions,andFloor/CeilingAssemblies
whichseparateadjacentdwellingunitsoradwellingunitfromanadjacentpublicarea
Min.IICof50(45iffieldtested)for:• AllFloor/CeilingAssemblieswhichseparate
adjacentdwellingunitsoradwellingunitfromanadjacentpublicarea
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AcousticalIsolationBetweenUnits
ClassDesignation Airborne SoundIsolation(STC)
FloorCeilingImpactIsolation(IIC)
EntryLevel 50 50
MarketRate 55 55
Luxury 60 60
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Exterior-to-Unit
SingleFamily
LandUseCategory ExteriorDay/NightNoiseLevels(Ldn,dBA)
MultiFamily
Motel,Hotels
OutsideUse
55 60 65 70 75 80
NormallyAcceptable
Conditionally Acceptable
NormallyUnacceptable
ClearlyUnacceptable
StateofCaliforniaGeneralPlanGuidelines,1987
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Retail-to-Unit
TypicalFloor-CeilingDetailAlthoughcommonbetweenrestaurantsorbarsandtheapartments above,theconfigurationshowninthisdetailmayleadtonoisecomplaints byapartmentoccupants.
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RatedAssemblies
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OneofManyPerformanceGoals
UniversityofWashingtonStudentHousingSeattle,WAArchitect:MahlumThisfive-building projectincludes astrategiccombination ofstaggeredanddouble studwallstominimizesoundtransmission. Photo:BenjaminBenschneider
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AcousticallyRatedAssemblies
ManyavailablefreeonlineSTC&IICratedassemblycharts(USG,GP,others)
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AcousticallyRatedAssemblies
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AirTightandInsulated
Examplesofineffectiveandeffectiveinstallation
PhotoDr.EnergySaver
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ElectricalBoxes– AvoidFlankingPaths
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Walls– DoubleStud
STC63PartyWallImage:tmsoundproofing.com
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Walls– StaggeredandSingleStud
Afterdoublestudconstruction,thenextbestsolutionsarestaggeredandsinglestud.
Photos:RootGraphics(l);ArchWoodProtection
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AcousticalDetailing
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ImprovementFactor:Sheathing
Effectofsheathing placement onacoustical performance
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ImprovementFactor:Insulation
Themostcost-effectiveacousticalimprovementtoasoundinsulationsystemistheadditionofbattinsulationoranyopencellfoamsystemtothestudorjointcavity.
PhotoDreamstime
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ImprovementFactor:ResilientChannels
Metalchannelsfoundinwoodframing
Acoustical‘puckisolator’walldetail(isometricview)
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ImprovementFactor:ResilientChannels
Properresilientchannelandfastenerinstallationiskeytotheperformanceofthesystem
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Floor-CeilingSystems
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AcousticalDetailing
Effectivefloor-ceilingoptionincludes:• Gypcreteorlight-weightconcrete• Impact isolationmatt• Tongueandgroovesubfloor(gluedandscrewedtothe joist)• Joistsystem(with6inchesofbattinsulation)• Resilient channelorpucksystem(resilient system)• Twolayersof5/8-inchtype“X”gypsumboard
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ImpactIsolation
Impact IsolationProgression inWood-FrameFloors/Ceilings (SectionView)
Forclarity,battinsulationinthejoistcavityisnotshown
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AdditionalAcousticsBestPractices
• Avoidcreatingflankingpaths• Isolatemechanicalsystemsbetweenunits• Sealopeningsinassemblies(whereairflows,sound
flows)• Avoidaligningdoorsonoppositesidesofcommon
hallways
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Doorways– AvoidFlankingPaths
Avoidaligningdoorsonoppositesidesofcommonhallways
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HVAC– AvoidFlankingPaths
Isolatemechanicalsystemsbetweenunits
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AdditionalConsiderations
CrescentTerminusAtlanta,GAThree-building, five-storymixed-usecomplexwithresort-style amenities
PhotoCrescentCommunities
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Outline
• Mid-RiseConstructionTypes&LifeSafetyReview• StructuralDesign&DetailingConsiderations• ShrinkageConsiderations&Detailing• AcousticRequirements&Detailing• FireResistiveRequirementsandDetailing
• ExteriorWalls• FloortoWallDetailing• InteriorWalls• ShaftWalls• Corridors&Balconies
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Key Differences in Fire Ratings for Construction Types
IIIA IIIB VA
Exterior (bearing) wall framing FRT FRT non-FRT
Exterior wall fire rating 2 hr 2 hr 1 hr
Interior bearing wall fire rating 1 hr 0 hr 1 hr
Interior non-bearing wall fire rating 0 hr 0 hr 0 hr
Floor assembly fire rating 1 hr 0 hr 1 hr
Fire wall rating 3 hr 3 hr 2 hr
FireResistanceRatings
IBCTables601&706.4Note:FRT=FireRetardantTreated
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FirePerformanceCo
mbu
stibility FireResistance
FlameSpreadClassificaiton
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Fire-ResistanceRatedWallAssemblies
FireConfinement StructuralPerformance
Fire-ResistanceRating:Theperiodoftimeabuildingelement,componentorassemblymaintainstheabilitytoconfineafire,continuestoperformagivenstructuralfunction,orboth,asdeterminedbythetests,orthemethodsbasedontests,prescribedinSection703.Tested underastandardizedtestfireexposureforagivendurationto:
1. Preventthepassage offlameandtemperature risefromonesidetotheother
2. Continue toprovideverticalstructuralsupportwhenexposed tofireandelevatedtemperatures
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Fire-ResistanceRatedWallAssemblies
There arefive basictypesoffire-resistanceratedwallassemblies:• LightFrameBearingWalls(IBC704.4.1)• ExteriorWalls(IBC705)
• FireWallorPartyWall(IBC706)• FireBarrier(IBC707)• FirePartition(IBC708)
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LightFrameBearingWalls(IBC704.4.1)
Kingstuds,jackstuds,andboundaryelementsmayhavefire-resistanceratingprovidedbymembraneinloadbearingwall
Typ.BearingWallOpeningFraming
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ExteriorWalls- FSD
Basicassumptionisthatfiresbeginattheinteriorandratedwallassembliesarenotrequiredfrom theexteriorunlessclosetoanotherstructure.
Interior
Exterior
FireProtectiononInsideofBuilding
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ExteriorWalls(IBC705)705.5 FireResistanceRatings:Exteriorwallsshallbefire-resistanceratedinaccordancewithTables601and602andthissection.Therequiredfire-resistanceratingofexteriorwallswithafireseparationdistanceofgreaterthan10feet(3048mm)shallberatedforexposuretofirefromtheinside.Therequiredfire-resistanceratingofexteriorwallswithafireseparationdistanceoflessthanorequalto10feet(3048mm)shallberatedforexposuretofirefrombothsides.
Interior
Exterior
X<10’
LotLine
Table 601&602
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ExteriorWallFireResistance
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ExteriorWall– Bearingvs.NonBearing
Nonloading-bearingexteriorwallsmayhavelowerfireresistanceratingrequirementsthanbearingwallsincertainsituations.IBCChapter2definesloadbearingwallsas:
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ExteriorWallFireRatings
• Usingtheprovisionsofsection705.5andTables601and602couldresultinrequiringa1houror2hourratingontheinsidefaceofexteriorwalls,whilenoratingisrequiredontheexteriorfaceofexteriorwalls.
• Howdowespecifysuchanasymmetricassembly?
• Thisiswhereprescriptivecodemethodologybeginstobreakdown:proceduraldatadoesnotalignwithrequirements.Mostbuildingjurisdictionsunderstandthatthisisadeficiencyofthesystemandwillrecognizeonetestedassemblyfortheoutsideandasecondfortheinside.
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2"HOUR EXTERIOR WALL
FRAMING AT 16" O.C.. MIN. 2 X 4
1 LAYER 5/8" FIBERGLASS MAT GYPSUM SHEATHING
STRUCTURAL WOOD PANEL(S)
WHERE REQUIRED FOR SHEAR
2"HOUR RATING PER UL DESIGN NO. U371
EXTERIOR CEMENT PLASTER, MIN. THICKNESS
3/4" TO FACE OF LATH
MIN. 3" THICK MINERAL
WOOL BATT INSULATION
2 LAYERS 5/8" TYPE 'X' GYPSUM
BOARD AT INTERIOR CONDITIONS
EXTERIOR CEMENT PLASTER OVER FIBERGLASS MAT GYPSUM
SHEATHING AT EXTERIOR CONDITIONS
ExteriorWalls- Asymmetry
Commonissueswithtestedassemblies:
• AssemblyAsymmetry-separateassembliesforeachside
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ExteriorWalls– 1HRInt.0HRExt.
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ExteriorWalls– 1HRInt.0HRExt.
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ExteriorWalls– 2HRInt.0HRExt.
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ExteriorWalls– 2HRInt.0HRExt.
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ExteriorWalls– 2HRInt.1HRExt.
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ChoosingFireRatedAssembliesCommontestedassemblies(ASTME119)perIBC703.2:• ULListings• GypsumCatalog• ProprietaryManufacturerTests• IndustryDocuments:suchasAWC’sDCA3
AlternateMethodsperIBC703.3• PrescriptivedesignsperIBC721.1• CalculatedFireResistanceperIBC
722• Fire-resistancedesignsdocumented
insources• Engineeringanalysisbasedona
comparison• Fire-resistancedesignscertifiedby
anapprovedagency
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ExteriorWalls– StructuralStability
705.6StructuralStability:ThewallshallextendtotheheightrequiredbySection705.11andshallhavesufficientstructuralstabilitysuchthatitwillremaininplaceforthedurationoftimeindicatedbytherequiredfire-resistancerating.Whereexteriorwallshaveaminimumfireseparationdistanceofnotlessthan30feet(9144mm),interiorstructuralelementswhichbracetheexteriorwallbutwhicharenotlocatedwithintheplaneoftheexteriorwallshallhavetheminimumfire-resistanceratingrequiredinTable601forthatstructuralelement.Structuralelementswhichbracetheexteriorwallbutarelocatedoutsideoftheexteriorwallorwithintheplaneoftheexteriorwallshallhavetheminimumfire-resistanceratingrequiredinTables601and602fortheexteriorwall.
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ExteriorWalls– VerticalOffsets
NolessthanSameratingaswallabove
Exteriorwall
Exteriorwall
Thereisnorequirementforanexteriorwalltoextendtothefoundationinasteppedbuilding.
Posts,beamsorwalls,thatsupportaratedexteriorwallmustbefire–resistanceratednotlessthantheratingofthesupportedwall(IBC704.1)
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ExteriorWalls– AdditionofWSP
CanincludeWSPinassemblieswhichweretestedwithoutthem:
• ESR2586• AWC’sDCA4
• GypsumAssociationManual
GAFireResistanceDesignManualitem23inSection1oftheGeneralExplanatoryNotes:"Whennotspecifiedasacomponentofafire- resistanceratedwallorpartitionsystem,woodstructuralpanelsshallbepermittedtobeaddedtooneorbothsides.”
ESR2586:
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ExteriorWalls– UsingFRTStuds
“Woodstudwallsmaycontainfire-retardant-treatedstudsaswellasuntreatedwoodstuds.Theuseoffire-retardant-treatedplywood(woodstructuralpanels)maybeusedinDesignsthatcontainuseofuntreatedplywoodwhenallotherspecifiedattributesareequivalenttothewoodstructuralpanelusedintheDesign.”
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Outline
• Mid-RiseConstructionTypes&LifeSafetyReview• StructuralDesign&DetailingConsiderations• ShrinkageConsiderations&Detailing• AcousticRequirements&Detailing• FireResistiveRequirementsandDetailing
• ExteriorWalls• FloortoWallDetailing• InteriorWalls• ShaftWalls• Corridors&Balconies
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Key Differences in Fire Ratings for Construction Types
IIIA IIIB VA
Exterior (bearing) wall framing FRT FRT non-FRT
Exterior wall fire rating 2 hr 2 hr 1 hr
Floor assembly fire rating 1 hr 0 hr 1 hr
Fire wall rating 3 hr 3 hr 2 hr
IntersectionofAssemblies- Ratings
IBCTables601&706.4Note:FRT=FireRetardantTreated
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IntersectionofTestedAssemblies2Ho
urW
all
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IntersectionofTestedAssemblies
1HourFloor
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IntersectionofTestedAssemblies• Manyoptionsareavailableforfireresistance
testedfloorassembliesandwallassemblies• Notestedintersectiondetailsexist• Wemustunderstandtheintent ofthecode,
providearationalethatmeetsthecode’sintent,andutilizeavailableinformationandtestingresults
2HourWall
1HourFloor
2HourWall
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TypeIIIExteriorWalls– FRT
TypeIIIandIVConstruction- IBCSection602.3:Fire-retardant-treatedwoodframingcomplyingwithSection2303.2shallbepermittedwithinexteriorwallassembliesofa2-hourratingorless
WhatdoesthisFRTWrequirementinclude?• WallFraming(Studs&Plates)– Yes• WallSheathing– YesFloorsheathing?RimJoist?FloorJoists?Everythingintheplaneofthewall?Oronlywallframing?
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ExteriorWalls– IntersectingFloors
SomejurisdictionsinterprettheallowanceofFRTframing inexteriorwallsoftypeIIIconstructionasnotincludingFRTwallsheathing.TheinclusionofwallsheathingisintendedintheallowanceofFRTframing.
Severalcodechangeproposalsareinplacewhichclarifythis
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ExteriorWalls– IntersectingFloors
Pleasenotethatthefollowingdetailsareexamplesofwhatwehaveseenusedonprojectsanddonotnecessarilyrepresentdetailsthatwillbeacceptedandapplicableinalljurisdictionsandtoallprojects.
Thesedetailsarenotintendedasrecommendationsforuniversallyaccepteddetails.Localproductavailabilityandmanufacturerspecificationsshouldalsobeconsideredforeachproject.
TheArchitectofRecordandEngineerofRecordshouldverifyacceptanceofthedetailsusedontheirprojectwithallprovisionsofthebuildingcode,includinglocalamendments,withthelocalAuthorityHavingJurisdiction.
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ExteriorWalls– IntersectingFloors
UntreatedorFRT
FRTWood
LegendFloorsheathing
FRTsheathing
Rationalefordetailapproval:• Intersectionofratedassemblies
(wall&floor)consideredsufficient
TypeIIIConstruction– 2HRWall,1HRFloorTypicalPlatformFraming
Rimjoist
Considerations:• Shrinkageof
rim,plates,joists
• Protectionofrimforfire
FloorJoistOptions:• SolidSawn• Trusses• I-Joists
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ExteriorWalls– IntersectingFloors
UntreatedorFRT
FRTWood
LegendFloorsheathing
FRTsheathing
Rationalefordetailapproval:• Membranesonbothsideofwallprovidefire
resistanceviatheirapprovedassembly;atfloorcavity,ceilingprovides1hour,1layerofblockingprovides2nd hr throughcharcalculations
TypeIIIConstruction– 2HRWall,1HRFloorTypicalPlatformFraming
Rimjoist
Blockingbetweenfloorjoists
Considerations:• Shrinkagein
rim,floorjoists,wallplates
FloorJoistOptions:• SolidSawn• Trusses• I-Joists
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ExteriorWalls– IntersectingFloors
UntreatedorFRT
FRTWood
LegendFloorsheathing
FRTsheathing
Rationalefordetailapproval:• Membranesonbothsideofwallprovidefire
resistanceviatheirapprovedassembly;atfloorcavity2layersofblockingprovide2hrprotectionthroughcharcalculations
TypeIIIConstruction– 2HRWall,1HRFloorTypicalPlatformFraming
Rimjoist
Blockingbetweenfloorjoists
Considerations:• Shrinkagein
rim,floorjoists,wallplates
FloorJoistOptions:• SolidSawn• Trusses• I-Joists
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ExteriorWalls– IntersectingFloors
UntreatedorFRT
FRTWood
Legend
FloorsheathingFRTsheathing
SolidWood/GlulamRimSection
Joisthanger
TypeIIIConstruction– 2HRWall,1HRFloorModifiedPlatformFraming
Rationalefordetailapproval:• Membranesonbothsideofwallprovidefire
resistanceviatheirapprovedassembly;atfloorcavity4xrimprovides2hr protectionthroughcharcalculations
Considerations:• Shrinkagein
rim,floorjoists,wallplates
FloorJoistOptions:• SolidSawn• Trusses• I-Joists
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CalculatedFireResistanceofWood
ForExposedWoodMembers:IBC722.1ReferencesAWC’sNDSChapter16(AWC’sTR10isadesignaidtoNDSChapter16)
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EquationsforCalculatingFireEndurance• Assumptions• Nominalassumedcharrate=1.5”/hr.• Usesultimatestrengthfordesigncheck
• Structurallyspanningmembers:reducedsectioncheckedforcapacityvs.demand
Source:AWC’sTR10
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CHARSLOWSWITHTIME-NONLINEAR
βeff = Effectivecharrate(in/hr),adjustedforexposuretime,t
βn = Nominalcharrate(in/hr),linearcharratebasedona1-hourexposure(1.5”/hr.)
t = Exposuretime(hrs)
187.0
2.1t
neff
ββ =
ACCOUNTSFORNON-CHARREDSTRENGTHRED’N
EquationsforCalculatingFireEndurance
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ExteriorWalls– IntersectingFloors
Floorsheathing
FloorJoistOptions• DeepI-joist• HungParallel
ChordTruss
FRTsheathing
SolidWood/Glula
mRimSection
Joisthanger
TypeIIIConstruction– 2HRWall,1HRFloorModifiedPlatformFraming
UntreatedorFRT
FRTWood
Legend
Rationalefordetailapproval:• Membranesonbothside
ofwallprovidefireresistanceviatheirapprovedassembly;atfloorcavity4xrimprovides2hr protectionthroughcharcalculations
Untreated
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ExteriorWalls– IntersectingFloors
Floorsheathing
FRTsheathing
Joisthanger
UntreatedorFRT
FRTWood
LegendTypeIIIConstruction– 2HRWall,1HRFloor
Semi-BalloonFraming
Rationalefordetailapproval:• Intersectionofrated
assemblies(wall&floor)consideredsufficient
UntreatedFloorJoistOptions:• SolidSawn• Trusses• I-Joists
Blocking
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ExteriorWalls– IntersectingFloors
Floorsheathing
FRTsheathing
Blocking Joisthanger
UntreatedorFRT
FRTWood
LegendTypeIIIConstruction– 2HRWall,1HRFloorSemi-BalloonFramingw/Add’l FireProtection
Rationalefordetailapproval:• Ceilingmembrane
provides1hr protection;Blockinginwallprovides2nd hr throughcharcalculations
UntreatedFloorJoistOptions:• SolidSawn• Trusses• I-Joists
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ExteriorWalls– IntersectingFloors
Floorsheathing
FRTsheathing
Blocking
TopflangeJoisthanger
2xblocking UntreatedorFRT
FRTWood
LegendTypeIIIConstruction– 2HRWall,1HRFloorSemi-BalloonFramingw/Add’l FireProtection
Rationalefordetailapproval:• Ceilingmembrane
provides1hr protection;Blockingbetweenjoistsprovides2nd hr throughcharcalculations
UntreatedFloorJoistOptions:• SolidSawn• Trusses• I-Joists
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ExteriorWalls– IntersectingFloors
Floorsheathing
FRTsheathing
Blocking
TopflangeJoisthanger
UntreatedorFRT
FRTWood
LegendTypeIIIConstruction– 2HRWall,1HRFloorSemi-BalloonFramingw/Add’l FireProtection
Rationalefordetailapproval:• Ceilingmembrane
provides1hr protection;1layerofwallmembraneprovides2nd hr
UntreatedFloorJoistOptions:• SolidSawn• Trusses• I-Joists
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ExteriorWalls– IntersectingFloors
Floorsheathing
FRTsheathing
Blocking
TopflangeJoisthanger
UntreatedorFRT
FRTWood
LegendTypeIIIConstruction– 2HRWall,1HRFloorSemi-BalloonFramingw/Add’l FireProtection
Rationalefordetailapproval:• 1layerofwallmembrane
provides1hr protection;blockingbetweenjoistsprovides2nd hr throughcharcalculations
Blocking
UntreatedFloorJoistOptions:• SolidSawn• Trusses• I-Joists
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ExteriorWalls– IntersectingFloors
Floorsheathing
FRTsheathing
TopflangeJoisthangerapprovedtospan2layersGWB
UntreatedorFRT
FRTWood
LegendTypeIIIConstruction– 2HRWall,1HRFloorSemi-BalloonFramingw/Add’l FireProtection
Rationalefordetailapproval:• Membranesonbothside
ofwallprovidefireresistanceviatheirapprovedassembly
UntreatedFloorJoistOptions:• SolidSawn• Trusses• I-Joists
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OverGypsumHangers
CommonlycalledFireWallorDrywallHangers
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OverGypsumHangers
TopFlangeHangers&FaceMountHangersAvailable
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ExteriorWalls– IntersectingFloors
Point#1ofInterpretation:Continuityof2hfirerating•
•Floorsheathing
FRTsheathing
Ledger(depthvaries)
TopflangeJoisthangerBlocking
UntreatedorFRT
FRTWood
LegendTypeIIIConstruction– 2HRWall,1HRFloor
Semi-BalloonFramingw/Ledger
Rationalefordetailapproval:• Membranesonbothsideof
wallprovidefireresistanceviatheirapprovedassembly;atfloorceilingmembraneprovides1hr;blockingprovides2nd hr&maintainsFRTcontinuity
Thisdetailisoftenusedwithabalcony– ledgeristhru-bolted
UntreatedFloorJoistOptions:• SolidSawn• Trusses• I-Joists
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Point#1ofInterpretation:Continuityof2hfirerating•
•Floorsheathing
FRTsheathing
Blocking
(2)2xflatblockingUntreatedorFRT
FRTWood
Legend
TypeIIIConstruction– 2HRWall,1HRFloorPlatformFramingw/TopChordBearing
Shouldspecifytrusswebholdback(3/4”
min.)toallowgypsuminstallation
ExteriorWalls– IntersectingFloors
Rationalefordetailapproval:• Membraneson
bothsideofwallprovidefireresistanceviatheirapprovedassembly;atfloorcavityceilingmembraneprovides1hr;1layerofwallmembraneprovides2nd hr
Untreated
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Point#1ofInterpretation:Continuityof2hfirerating•
•Floorsheathing
FRTsheathing
Blocking
(2)2xflatblocking
TypeIIIConstruction– 2HRWall,1HRFloorPlatformFramingw/TopChordBearing
Shouldspecifytrusswebholdback(3/4”
min.)toallowgypsuminstallation
ExteriorWalls– IntersectingFloors
Rationalefordetailapproval:• Membraneson
bothsideofwallprovidefireresistanceviatheirapprovedassembly;atfloorcavityblockinginwallprovides1hr;1layerofwallmembraneprovides2nd hr
UntreatedorFRT
FRTWood
Legend
Untreated
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Point#1ofInterpretation:Continuityof2hfirerating•
•Floorsheathing
FRTsheathing
Blocking
TypeIIIConstruction– 2HRWall,1HRFloorPlatformFramingw/TopChordBearing
ExteriorWalls– IntersectingFloors
Rationalefordetailapproval:• Membraneson
bothsideofwallprovidefireresistanceviatheirapprovedassembly;atfloorcavityblockinginwallprovides1hr;1layerofwallmembraneprovides2nd hr
UntreatedorFRT
FRTWood
Legend
Untreated
Topflangetrusshanger
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Point#1ofInterpretation:Continuityof2hfirerating•
•
Floorsheathing
FRTsheathing
(2)2xflatblocking
ExteriorWalls– IntersectingFloorsTypeIIIConstruction– 2HRWall,1HRFloorPlatformFramingw/TopChordBearing
Shouldspecifytrusswebholdback(1-
1/2”min.)toallowgypsuminstallation
Rationalefordetailapproval:• Membranes
onbothsideofwallprovidefireresistanceviatheirapprovedassembly
UntreatedorFRT
FRTWood
Legend
Untreated
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Point#1ofInterpretation:Continuityof2hfirerating•
•Floorsheathing
FRTsheathing
Blocking
2xrimUntreatedorFRT
FRTWood
Legend
ExteriorWalls– IntersectingFloorsTypeIIIConstruction– 2HRWall,1HRFloorPlatformFramingw/TopChordBearing
Shouldspecifytrusswebholdback(1-
1/2”min.)toallowgypsuminstallation
Rationalefordetailapproval:• Membranes
onbothsideofwallprovidefireresistanceviatheirapprovedassembly
Notereducedtrussbearinglength
Untreated
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ExteriorWalls– IntersectingFloors
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ExteriorWalls– IntersectingFloors
Gapsbtwnendoftrussmembersandwalltoallowgypsuminstallafter
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Floorsheathing
FRTsheathing
(2)2xflatblocking
ExteriorWalls– IntersectingFloorsTypeIIIConstruction– 2HRWall,1HRFloor
PlatformFramingw/TopChordBearing/Ledger
Shouldspecifytrusswebholdbackto
allowledgerinstallation (2)2xledger
Rationalefordetailapproval:• Membraneson
bothsideofwallprovidefireresistanceviatheirapprovedassembly;attopchords,ledger&sheathingprovidecontinuity
UntreatedorFRT
FRTWood
Legend
Untreated
Sheathing
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Floorsheathing
FRTsheathing
ExteriorWalls– IntersectingFloorsTypeIIIConstruction– 2HRWall,1HRFloorPlatformFramingw/TopChordBearing
UntreatedorFRT
FRTWood
Legend
Untreated
Rationalefordetailapproval:• Intersectionof
ratedassemblies(wall&floor)consideredsufficient
2xribbon
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Floorsheathing
FRTsheathing
ExteriorWalls– IntersectingFloorsTypeIIIConstruction– 2HRWall,1HRFloorPlatformFramingw/TopChordBearing
UntreatedorFRT
FRTWood
Legend
Untreated
Rationalefordetailapproval:• Membraneson
bothsideofwallprovidefireresistanceviatheirapprovedassembly;atfloorcavityblockinginwallprovides1hr;ceilingprovides2nd hr
Blockingbetweenfloortrusses
2xribbon
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Floorsheathing
FRTsheathing
ExteriorWalls– IntersectingFloorsTypeIIIConstruction– 2HRWall,1HRFloorPlatformFramingw/TopChordBearing
Rationalefordetailapproval:• Membranes
onbothsideofwallprovidefireresistanceviatheirapprovedassembly
InfillWallFramingBetweenTrusses
WallGypsumExtendstoUndersideofFloorSheathingBetweenTrusses
UntreatedorFRT
FRTWood
Legend
Untreated
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ExteriorWalls– IntersectingFloors
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ExteriorWalls– Bearingvs.Non-Bearing
Non-bearingExteriorWalls
PerimeterStructuralBeams
Utilizationofstructuralbeamsin-boardordirectlyoverexteriorwallscanmakewallsnon-bearingandreducerequiredfireresistanceratingto1HRor0HR(IBCTable602)Note:Beams&Columnswillmostlikelybeconsidered“PrimaryStructuralFrame”&requireindividualencasementperIBC704
FloorFraming
PerimeterStructuralColumns
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ExteriorWalls– Bearingvs.Non-Bearing
Ifframingparalleltolongexteriorwallsispossible,minimizesareaofloadbearingexteriorwalls
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TypeIIIConstructionDetailExamples
Whatisbeingenforcedinjurisdictionsyouareworkingin?
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Outline
• Mid-RiseConstructionTypes&LifeSafetyReview• StructuralDesign&DetailingConsiderations• ShrinkageConsiderations&Detailing• AcousticRequirements&Detailing• FireResistiveRequirementsandDetailing
• ExteriorWalls• FloortoWallDetailing• InteriorWalls• ShaftWalls• Corridors&Balconies
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InteriorFire-RatedWalls:Differences
Firewalls
• BuildingSeparation
• Openingsareprotected
• Continuousfromfoundationto/throughroof
• Structuralstability
FireBarrier
• Shafts,OccupancySeparation
• Continuousfromfloorthroughconcealedspace
FirePartition:
• DwellingUnitSeparation;Corridors
• Openingsareprotected
• Mayterminateatafireratedfloor/celiling/roofassembly
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FireWalls– Ratings&Materials
IBC706.3– Firewallsshallbeofanyapprovednon-combustiblematerials.
Exception:BuildingsofTypeVconstruction
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FireWalls– Ratings&Materials
OpportunityforWoodFramedFireWalls:• PermittedintypeVConstruction• FireWallsintypeVConstructionofA,B,E,Rand
severalotheroccupanciesmaybe2hourFireWallsintypeIIIandIVconstructionarerequiredtobeconstructedofnon-combustiblematerials• Opportunityforwoodframebearingwallsoneach
sideoffirewalltomeetstructuralstabilityrequirements
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FireWalls– StructuralStability
706.2StructuralStability:Firewallsshallhavesufficientstructuralstabilityunderfireconditionstoallowcollapseofconstructiononeithersidewithoutcollapseofthewallforthedurationoftimeindicatedbytherequiredfire-resistanceratingorshallbeconstructedasdoublefirewallsinaccordancewithNFPA221.
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2HourFireWallAssembly
2"HOUR DOUBLE STUD WALL
2 X FRAMING AT 16" O.C.
2"HOUR RATING PER GA FILE NO. WP 3820
WOOD STRUCTURAL PANELS WHEREREQUIRED FOR SHEAR
RESILIENT DRAFT STOPS ATMAX. 10' O.C. HORIZONTAL
2 LAYERS 5/8" TYPE 'X' GYPSUMBOARD EACH SIDE
BATT INSULATION AS REQUIRED FOR THERMAL/ACOUSTICALPERFORMANCE
AIR
GAP
0' "
1"
ConstructionType:• V
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2HourFireWallAssembly
ConstructionType:• V
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2HourFireWallAssembly
ConstructionTypes:• III• IV• V
AlsoseeULU336
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2HourFireWallAssembly
2"HOUR FIRE WALL ASSEMBLY
2 1/2" METAL STUDS AT 24" O.C.
2 LAYERS 5/8" TYPE 'X' GYP. BD. ON EACH SIDE OF METAL STUDS
WOOD STRUCTURAL PANELS WHERE REQUIRED FOR SHEAR
2"HOUR RATING PER GA FILE NO. WP 1548
WOOD STUD WALLS ON EITHERSIDE OF FIRE WALL
AIR
GA
P
0' "
1"
AIR
GA
P
0' "
1"
INTERIOR OR EXTERIOR FINISH AS REQUIRED
BATT INSULATION (OPTIONAL)
CAD&RevitDetails:www.woodworks.org
ConstructionTypes:• III• IV• V
GAWP1548ULU411
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2HourFireWallAssembly
2"HOUR FIRE WALL AT FLOOR/CEILING
2"HR. ASSEMBLY: 2 1/2" METALSTUDS WITH 2 LAYERS 5/8" TYPE 'X'
GYP. BD. EACH SIDE
CONTINUOUS STRUCTURAL WOODPANELS " USE FIRE"TREATED PANELS
THROUGH WALL CAVITY¹
¹CONSULT LOCAL JURISDICTION HAVING AUTHORITY FOR ACCEPTANCE OF FIRE"TREATED WOODPANELS RUNNING THROUGH 2"HOUR ASSEMBLY IN THIS APPLICATION.
RIM JOIST WITH SOLID BLOCKING
2"HOUR FIRE CAULKING
1" AIR GAP
RESILIENT CHANNELS
2 X 4 STUD WALL EACH SIDE, WITHSTRUCTURAL WOOD PANELS AS
REQUIRED FOR SHEAR AND 1 LAYER5/8" TYPE 'X' GYP. BD.
SAWN LUMBER FRAMING WITH WOOD PANEL DIAPHRAGM RUNNING THROUGH FIRE WALL
CAD&RevitDetails:www.woodworks.org
ConstructionTypes:• III• IV• V
GAWP1548ULU411
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2HourFireWallAssembly
ConstructionTypes:• III• IV• V
Caninstallwoodbearingwalloneachsideof2hourwall
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3HourFireWallAssembly
3"HOUR FIRE WALL ASSEMBLY
1 5/8" METAL STUDS AT 24" O.C. MAX.
3 LAYERS 1/2" TYPE 'X' GYP. BD. ON EACH SIDE OF METAL STUDS
WOOD STRUCTURAL PANELS WHERE REQUIRED FOR SHEAR
3 HOURS PER UL DESIGN NO. U435
WOOD STUD WALLS ON EITHERSIDE OF FIRE WALL
AIR
GAP
0' "
1"
AIR
GAP
0' "
1"
INTERIOR OR EXTERIOR FINISH AS REQUIRED
BATT INSULATION (OPTIONAL)
ConstructionTypes:• III• IV• V
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3HourFireWallAssembly
• (2)1”TypeXGypsum• 2”HStuds• 2”mineralfiberinsulation
eachside
ConstructionTypes:• III• IV• V
Couldinstallwoodbearingwalloneachsideof3hourwall
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3HourFireWallAssembly
Couldinstallwoodbearingwalloneachsideof3hourwall
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FireWalls– SeismicDiaphragmContinuity
CAD&RevitDetails:www.woodworks.org
3"HOUR FIRE WALL AT FLOOR/CEILING
3"HR. ASSEMBLY: 1 5/8" METALSTUDS WITH 3 LAYERS 1/2" TYPE 'X'
GYP. BD. EACH SIDE
3"HOUR FIRE CAULKING
1" AIR GAP
RESILIENT CHANNELS
2 X 4 STUD WALL EACH SIDE, WITHSTRUCTURAL WOOD PANELS AS
REQUIRED FOR SHEAR AND 1 LAYER5/8" TYPE 'X' GYP. BD.
CONTINUOUS 13 1/2" WIDE 14 GA. GALV.SHT. METAL
CONTINUOUS 16 GA. TRACK TOP ANDBOTTOM
FIRE SAFING
CONTINUOUS 16 GA. COMP. CHANNEL
WOOD TRUSS FRAMING WITHOUT WOOD PANEL DIAPHRAGM RUNNING THROUGH FIRE WALL3"HOUR FIRE WALL AT FLOOR/CEILING
3"HR. ASSEMBLY: 1 5/8" METALSTUDS WITH 3 LAYERS 1/2" TYPE 'X'
GYP. BD. EACH SIDE
CONTINUOUS STRUCTURAL WOODPANELS " USE FIRE"TREATED PANELS
THROUGH WALL CAVITY¹
¹CONSULT LOCAL JURISDICTION HAVING AUTHORITY FOR ACCEPTANCE OF FIRE"TREATED WOODPANELS RUNNING THROUGH 3"HOUR ASSEMBLY IN THIS APPLICATION.
RIM JOIST WITH SOLID BLOCKING
3"HOUR FIRE CAULKING
1" AIR GAP
RESILIENT CHANNELS
2 X 4 STUD WALL EACH SIDE, WITHSTRUCTURAL WOOD PANELS AS
REQUIRED FOR SHEAR AND 1 LAYER5/8" TYPE 'X' GYP. BD.
I"JOIST FRAMING WITH WOOD PANEL DIAPHRAGM RUNNING THROUGH FIRE WALL
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FireWalls– SeismicDiaphragmContinuity
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FireBarriers– IBC707
Commonlyusedin:• Shaftenclosures• Interiorexitstairway• Exitstairwayenclosures• Exitpassageways• Incidentaluses• Separatedoccupancies• FireAreas
2012IBCCode&Commentary
FireBarrierExample
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FireBarriers– IBC707FireBarriers:§ Maybeconstructedwithanymaterialspermittedbythe
constructiontype§ FireResistanceRatings:• ShaftEnclosures:IBC713.4
• 2Hr whenconnecting4storiesormore,1hr ifless• SeparatedOccupancies:IBCTable508.4• FireAreas:IBCTable707.3.10
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FireBarriers– IBC707
707.5:Continuity:Firebarriersshallextendfromthetopofthefoundationorfloor/ceilingassemblybelowtotheundersideofthefloororroofsheathing,slabordeckaboveandshallbesecurelyattachedthereto.Suchfirebarriersshallbecontinuousthroughconcealedspace,suchasthespaceaboveasuspendedceiling
707.5.1SupportingConstruction:Thesupportingconstructionforafirebarriershallbeprotectedtoaffordtherequiredfire-resistanceratingofthefirebarriersupported.Hollowverticalspaceswithinafirebarriershallbefireblocked inaccordancewithSection718.2ateveryfloorlevel.
Otherrequirementsforopenings,penetrations,joints
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FireBarriers– IBC707
CommonDetailingMethod:FireBarrier&membraneextendtoundersideoffloordeckabove
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FirePartitions– IBC708
Commonlyusedtoseparate:• Dwellingorsleeping
unitsinsamebldg.• Tenantspacesinmalls• CorridorwallsMinimum1hr ratingexcept:• Somecorridors• Separatedwellingunits
inVBandIIB
2012IBCCode&Commentary
FirePartitionExample
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FirePartitions– IBC708FirePartitions:§ Maybeconstructedwithanymaterialspermittedbythe
constructiontype§ 708.3FireResistanceRatings:• Firepartitionsshallhaveafire-resistanceratingofnotless
than1hour.Exceptions:1.Corridorwallspermittedtohavea1/2 hourfire-resistanceratingbyTable1018.1.2.DwellingunitandsleepingunitseparationsinbuildingsofTypeIIB,IIIBandVBconstructionshallhavefire-resistanceratingsofnotlessthan1/2 hourinbuildingsequippedthroughoutwithanautomaticsprinklersysteminaccordancewithSection903.3.1.1.
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FirePartitions– IBC708708.4Continuity.Firepartitionsshallextendfromthetopofthefoundationorfloor/ceilingassemblybelowtotheundersideofthefloororroofsheathing,slabordeckaboveortothefire-resistance-ratedfloor/ceilingorroof/ceilingassemblyabove,andshallbesecurelyattachedthereto.Incombustibleconstructionwherethefirepartitionsarenotrequiredtobecontinuoustothesheathing,deckorslab,thespacebetweentheceilingandthesheathing,deckorslababoveshallbefireblocked ordraftstopped inaccordancewithSection718.2and718.3atthepartitionline.Thesupportingconstructionshallbesupportedtoaffordtherequiredfire-resistanceratingofthewallsupported,exceptfor...wallsseparatingdwellingunits,wallsseparatingsleepingunits,andcorridorwalls,inbuildingsofTypeIIB,IIIBandVBconstruction.
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FirePartitions– IBC707
CommonDetailingMethod:FirePartition&membranestopatundersideofratedfloor/ceilingwithfireblocking/draftstopping ifrequired
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Outline
• Mid-RiseConstructionTypes&LifeSafetyReview• StructuralDesign&DetailingConsiderations• ShrinkageConsiderations&Detailing• AcousticRequirements&Detailing• FireResistiveRequirementsandDetailing
• ExteriorWalls• FloortoWallDetailing• InteriorWalls• ShaftWalls• Corridors&Balconies
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Detailing:ShaftWallsvs.ExteriorWalls
IBC713.2:ShaftWallsshallbeconstructedasFireBarriers
KeyDifferencesbetweenExteriorWallsandShaftWalls(FireBarriers)• Continuity• SupportingConstruction• FireResistanceRatings• ConstructionMaterials
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Detailing:ShaftWallsvs.ExteriorWalls
ShaftWallRequirements:
707.5:FireBarrierContinuity:• Mustextendfromtopofthefoundationorfloor/ceiling
assemblybelowtotheundersideofthefloororroofsheathing
• Throughconcealedspaces
707.5.1:SupportingConstruction:• Thesupportingconstructionfora
firebarriershallbeprotectedtoaffordtherequiredfire-resistanceratingofthefirebarriersupported.
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Detailing:ShaftWallsvs.ExteriorWalls
ShaftWallRequirements:
713.4Fire-ResistanceRating:• 2hours(4storiesormore)• 1hour(lessthan4stories)• Numberofconnectedstoriesincludesbasementbutnot
mezzanine• Fireratingshallnotbelessthanfloorassemblypenetrated,
butneednotexceed2hours
707.2:ConstructionMaterials:• Anypermittedbyconstructiontype• FRTWnotrequiredforshaftwallsintypesIII,IV,V
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Detailing:ShaftWallsvs.ExteriorWalls
Howdoweachievetheserequirements?
Continuity:Thegeneralrequirementsin707.5werenotwrittenwithplatformconstructioninmind...theywereattemptingtoprecludelargeopenconcealedspacestoprovideacontinuousbarrierbetweenoneportionofthebuildingandanother
Manyjurisdictionshaverecognizedthatcontinuityofthefirebarrier’sfireprotectioncanbemaintainedevenifthewallframing doesnotextendtotheundersideofthedeckingabove
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Detailing:ShaftWallsvs.ExteriorWalls
SupportingConstruction:Musthavesamefireresistanceratingasfirebarrierbeingsupported
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Detailing:ShaftWallsvs.ExteriorWalls
SupportingConstruction:Inplatformandsemi-balloonframeconstruction,ifwehavea2hourshaftwallanda1hourfloor,howdoweachievethis?Ifweareabletodemonstratethewall’s2hourcontinuity,shouldnotneedtoconsiderthefloor“supportingconstruction”?
1HourFloor
2HourWall
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Detailing:ShaftWallsvs.ExteriorWalls
TypesofShafts:• Elevator• Stair• Mechanical
Somepointsofshaftwallconstructionapplytoanytypeofshaft.Someareuniquetoeachtypeofshaft.
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ShaftWalls
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ShaftWalls
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MasonryShaftWalls
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MasonryShaftWalls
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MasonryShaftWalls
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MasonryShaftWalls
Mixingmasonryshaftwallswithwoodfloorframingcancreateseveralissues:• Masonryshaftwallscanbecomepartofbuilding’s
lateralforceresistingsystem,increasingseismicforcesandaddingmass
• Differentialshrinkagebetweenwoodandmasonry
• Bestpracticesincludeseismicallyisolatingmasonryshaftwalls,onlytiewoodfloortomasonryshaftwhererequired(i.e.atelevatordoorthreshold)
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MasonryShaftWalls
CMUshaftwall
MasonryShaftWallDetail
Floorframingandwoodbearingwalls
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MasonryShaftWalls
CMUshaftwall
MasonryShaftWallDetail
Floorbeam,joists&sheathing
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ShaftWallMaterialChoice
Whydoweintroducenewmaterialsforourshaftwalls?Theycanbeframedwithwood!
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WoodFramedShaftWalls
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WoodFramedShaftWalls
Usingwoodframedshaftwallscan:• Eliminatelateralloadconsiderationsassociatedwithattaching
wooddiaphragmstoconcreteormasonryshaftwalls(SDPWS4.1.5)
• Eliminatedifferentialshrinkageatfloortowalltransition• Eliminatedifferentconstructiontradesinbuildingduring
construction• Reducecosts• Improveschedule
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ShaftWallDetails
WoodDesignFocus:Volume22,Issue3bySmith
Rimjoist
Floorjoists
2layers5/8”thk.Type“X”GWBeachsidefor2hr.rating(ULU301)
2xstudsDbl.rowofsolidblockingtocontinuefirerating
WSPsht’gasrequired
Concretetopping
Considerations:• Shrinkageinrim&floorjoist• Acoustics
Rationalefordetailapproval:• Membraneson
bothsideofwallprovidefireresistanceviatheirapprovedassembly;atfloorcavity2layersofblockingprovide2hrprotectionthroughcharcalculations
ShaftSide
FloorSide
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ShaftWallDetails
Rationalefordetailapproval:• Membranesonbothsidesofwallprovidefire
resistanceviatheirapprovedassemblyandarecontinuous.FRTfloorsheathingcanbeinsuranceforminimalpenetrationofmembrane.
ShaftSide FloorSide
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ShaftWallsw/Shaftliner
Rationalefordetailapproval:• Shaftlinerassemblyprovidesfireresistance
independentofframingmaterialoneitherside.
ShaftSide FloorSide
Floorsidewallprovidestypicalfloorsupport
Shaftliner inH-studsattachedtowallwithclips
Shaftsidewallprovidesshaftframing(stair,elevatorrail)support
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ShaftWallsw/HStuds&Shaftliner
Source:GeorgiaPacific
Source:USGypsum
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ShaftWallsw/HStuds&Shaftliner
SingleWallOption
Source:ULU375DoubleWallOption
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ShaftWallsw/HStuds&Shaftliner
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HStudAttachmentClips
ExampleShaftliner ClipAttachment ScheduleperULU375SystemNo. SystemHeight
LimitationAttachment ClipSchedule
1 23ft 10ft o.c.2 44ft Baseto20 ft:5ft o.c.
20ft to44ft:10ft o.c.3 66ft Baseto22ft:3’-4”o.c.
22ft to42ft:5ft o.c.42ft to66ft:10ft o.c.
AttachmentClips:Aluminumorsteelangles,usually14– 16gauge,2”widewith2”to2-1/2”longlegs.AttachestowallframingandH-studs
H-StudSource:Clarkdietrich
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ShaftWallsw/ShaftlinerCanalsoutilizewoodframedshaftwallson3sidesandCHstudswithshaftliner on4th side
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ShaftWallsw/CHorCTStuds2hourwallswithC-HStuds,shaftliner,and
gypsumpanels
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ShaftWallsw/CHorCTStuds
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ShaftWallsw/CHorCTStuds
Somewallmanufacturerswilllistatotalsystemheightlimitation.Ifthisisnotarequirementofthetestedassembly(i.e.ULorsim.requirement)canalsoperformastructuralanalysisofthewalls,especiallywhenstackingmultiplestories,toverifyadequacy
Source:Clarkdietrich
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StairwayShaftEnclosures&FramingWoodFramedWallon
3SidesofShaft
CHStudsw/Shaftlineron4th SideofShaft
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ElevatorShaftWalls
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ElevatorShaftWalls
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WoodFramedElevatorShaftWall
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WoodFramedElevatorRailSupports
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WoodFramedElevatorRailSupports
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WoodFramedElevatorRailDetails
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ElevatorShaftWall
WoodDesignFocus:Volume22,Issue3bySmith
Rimjoist
Floorjoists
2layers5/8”thk.Type“X”GWBeachsidefor2hr.rating
Doublestudwall Dbl.rowofsolidblockingtocontinuefirerating
Concretetopping
Nailerplate
WSPsht’gasrequired
Elevatorguiderailsandsupportbracketwithslottedholes
Galvanizedmetalspacer
Considerations:• Shrinkage• Improvedacoustical
performancewithdoublewall
Rationalefordetailapproval:• Membraneson
bothsideofwallprovidefireresistanceviatheirapprovedassembly.2layersof2xblockinginfloorcavitycontinueprotection
ShaftSide FloorSide
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Considerations:• Shrinkageinrim&floorjoist/differentialshrinkage• Doublewallprovidesimprovedacoustics
ElevatorShaftWall
Floorjoists
2layers5/8”thk.Type“X”GWBeachsidefor2hr.rating
Doublestudwall
Concretetopping
Nailerplate
WSPsht’g asrequired
Elevatorguiderailsandsupportbracketwithslottedholes
Galvanizedmetalspacer
Rationalefordetailapproval:• Membraneson
bothsideofwallprovidefireresistanceviatheirapprovedassemblyTopflangejoist
hangerapprovedtospan2layersGWB
ShaftSide FloorSide
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StairShaftWalls
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StairShaftWalls
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StairwayShaftEnclosures&Framing
ExteriorBearingWall
IntermediateLandingFramingElev.=94’-8”
CorridorFramingElev.=100’-0”
Floo
rFraming
Elev.=100
’-0”
IndicatesDownwardStairTravelPath
LandingFramingElev.=100’-0”
Floo
rFraming
Elev.=100
’-0” Structural
Beam
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ShaftWalls
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WoodFramedStairShaftWalls
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WoodFramedStairShaftWalls
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WoodFramedStairShaftWalls
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StairwayShaftEnclosures&Framing
TypicalFloorjoist
StairFraming(Landing&Stringers)
Attachmentofstairframingtoshaftwallthroughgypsum,typically2layers
Shaftwall
Stair&FloorCommonWallDetail
Rationalefordetailapproval:• 2layersofwallmembrane
provide2hr protection
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StairwayShaftEnclosures&Framing
TypicalFloorjoist
Shaftwall
Stair&FloorCommonWallDetail
Rationalefordetailapproval:• Membranesonbothsideof
wallprovidefireresistanceviatheirapprovedassembly
IntermediateStairLanding
FramingAttachledgertoeachshaftwallstudwithfasteners(woodscrews,lagscrews)designedtoaccountforgypsum
StairShaftSide
FloorSide
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StairwayShaftEnclosures&Framing
StairFraming(Landing&Stringers) Attachmentofstair
framingtoshaftwallthroughgypsum,typically2layers
Shaftwall
Consider“Hinge”atwallplatesforout-of-planewind&seismicloadsduetolackofadjacentfloor:• SpanPlates
Horizontally(nojoints)• Installadditional
member(rim)tospanhorizontally
StairExteriorWallDetail
Rationalefordetailapproval:• 2layersofwallmembrane
provide2hr protection
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StairwayShaftEnclosures&Framing
IntermediateStairLanding
WhenStairShaftWallisExteriorWall
WallPlatesatTypicalFloorElevation– CreatesPotential“Hinge”
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StairwayShaftEnclosures&Framing
IntermediateStairLanding
Framing Attachledgertoeachshaftwallstudwithfastenersdesignedtoaccountforgypsum
Shaftwall
StairExteriorWallDetail
Rationalefordetailapproval:• Membranesonbothsideof
wallprovidefireresistanceviatheirapprovedassembly
StairShaftSide
ExteriorSideConsider“Hinge”atwallplatesforout-of-planewind&seismicloadsduetolackofadjacentfloor:• Spanplateshorizontally• Installadditional
member(rim)tospanhorizontally
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StairwayShaftEnclosures&Framing
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StairwayShaftEnclosures&Framing
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StairwayShaftEnclosures&Framing
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StairwayShaftEnclosures&Framing
IntermediateStairLanding
Framing Attachledgertoeachshaftwallstudwithfastenersdesignedtoaccountforgypsum
Shaftwall
StairExteriorWallDetail
Rationalefordetailapproval:• Membranesonbothsideof
wallprovidefireresistanceviatheirapprovedassembly
StairShaftSide
ExteriorSideConsider“Hinge”atwallplatesforout-of-planewind&seismicloadsduetolackofadjacentfloor:• Installadditional
member(rim)tospanhorizontally
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StairwayShaftEnclosures&Framing
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StairwayShaftEnclosures&Framing
IntermediateStairLanding
ExteriorWallPlateElevationsShiftedDowntoIntermediate
LandingElevation
• EliminatesHingeEffect• AvoidsInterferencewith
LandingWindows
WhenStairShaftWallisExteriorWall
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StairwayShaftEnclosures&Framing
IntermediateStairLanding
Framing Attachledgertoeachshaftwallstudwithfasteners(woodscrews,lagscrews)designedtoaccountforgypsum
Shaftwall Wallplateelevationsshiftedtointermediatelandingelevationatstairshafts
StairExteriorWallDetail
Rationalefordetailapproval:• Membranesonbothsideof
wallprovidefireresistanceviatheirapprovedassembly
StairShaftSide
ExteriorSide
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StairwayShaftEnclosures&Framing
IntermediateStairLanding
Framing
Topflangejoisthangerapprovedtospan2layersGWB
ShaftwallWallplateelevationsshiftedtointermediatelandingelevationatstairshafts
StairExteriorWallDetail
Rationalefordetailapproval:• Membranesonbothsideof
wallprovidefireresistanceviatheirapprovedassembly
StairShaftSide
ExteriorSide
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StairwayShaftEnclosures&Framing
StairLandingFraming
Attachledgertostudswithfasteners(woodscrews,lagscrews)designedtoaccountfor1layerofgypsum
Shaftwall Blockinginshaftwallbetweenstuds
Wallplatesattypicalfloorelevation
LedgerInterruptsOneLayerofShaft
WallGypsum
StairWallDetail
Rationalefordetailapproval:• Membranesonbothsideof
wallprovidefireresistanceviatheirapprovedassembly;atfloorcavity,blockinginwallprovides2nd hr
StairShaftSide
ExteriorSide
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StairwayShaftEnclosures&Framing
StairLandingFraming Attachledgertoblocking
withfasteners(woodscrews,lagscrews)
Shaftwall2layersofblockinginshaftwallbetweenstudstoprovide2hoursprotection&ledgerfastenerattachment
Wallplatesattypicalfloorelevation
StairWallDetail
Rationalefordetailapproval:• Membranesonbothsideof
wallprovidefireresistanceviatheirapprovedassembly;atfloorcavity2layersofblockinginwallprovide2hr protection
StairShaftSide
ExteriorSide
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StairwayShaftEnclosures&Framing
IntermediateStairLanding
Framing
Shaftwall Wallplateelevationsshiftedtointermediatelandingelevationatstairshafts
StairExteriorWallDetail
Rationalefordetailapproval:• Membranesonbothsideof
wallprovidefireresistanceviatheirapprovedassembly
StairShaftSide
ExteriorSide
Installspanningbeamjustinboardofshaftwall -onlypenetratewallatendofbeamlocations–requiresintermediateheightposts
FloorBm
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StairwayShaftEnclosures&Framing
Wallplateelevationsshiftedtointermediatelandingelevationatstairshafts
StairExteriorWallDetail
Rationalefordetailapproval:• Membranesonbothsideof
wallprovidefireresistanceviatheirapprovedassembly
StairShaftSideExteriorSide
Shaftwall
IntermediateLandingFloorSheathingmayStopatLandingWallifLandingWallisAdequatelyBraced
Landingandstairframingsupportedonindependent
bearingwalls– shouldconsiderlateralbracingof
independentwalls
IntermediateStairLanding
Framing
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StairwayShaftEnclosures&Framing
StairFraming(Landing&Stringers)
Landingandstairframingsupportedonindependentbearingwalls– shouldconsiderlateralbracingofindependentwalls
Shaftwall
Wallplatesattypicalfloorelevation
Rationalefordetailapproval:• Membranesonbothsideof
wallprovidefireresistanceviatheirapprovedassembly
StairWallDetail
StairShaftSide ExteriorSide
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StairwayShaftEnclosures&Framing
ExteriorBearingWall
LandingFramingElev.=94’-8”
CorridorFramingElev.=100’-0”
Floo
rFraming
Elev.=100
’-0”
IndicatesDownwardStairTravelPath
LandingFramingElev.=100’-0”
Floo
rFraming
Elev.=100
’-0”
IntermediateLandingBeamConcentratedLoad
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StairwayShaftEnclosures&Framing
IntermediateStairLanding
Framing
Shaftwall
StairExteriorWallDetail
Rationalefordetailapproval:• Membranesonbothsideof
wallprovidefireresistanceviatheirapprovedassembly;atfloorcavitybeamoversizedtoprovide2hourcharprotection
StairShaftSide
ExteriorSide
IntermediateLandingBeamExtendsintoShaftWall– OversizetoProvide2HourFireProtectionUsingCalculatedCharRates
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StairwayShaftEnclosures&Framing
2Hr protectionprovidedall
aroundbeamvia.blocking
Beambearsdirectlyonaxiallyloadedpost–shrinkageconcernsareminimized
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Outline
• Mid-RiseConstructionTypes&LifeSafetyReview• StructuralDesign&DetailingConsiderations• ShrinkageConsiderations&Detailing• AcousticRequirements&Detailing• FireResistiveRequirementsandDetailing
• ExteriorWalls• FloortoWallDetailing• InteriorWalls• ShaftWalls• Corridors&Balconies
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Corridors– FireResistanceRatings
CheckrequirementsofIBCTables601and1018.1forCorridorWallandFloor/CeilingFire-ResistanceRatings
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Corridors– FireResistanceRatings
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CorridorWalls
IBC1018.1:Corridorwallsrequiredtobefire-resistanceratedshallcomplywithSection708forfirepartitions.
708.3Fire-resistancerating.Firepartitionsshallhaveafire-resistanceratingofnotlessthan1hour.
Exception:Corridorwallspermittedtohavea1/2hourfire-resistanceratingbyTable1018.1(appliestoRoccupancieswithsprinklersystems)
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CorridorWalls708.4Continuity.Firepartitionsshallextendfromthetopofthefoundationorfloor/ceilingassemblybelowtotheundersideofthefloororroofsheathing,slabordeckaboveortothefire-resistance-ratedfloor/ceilingorroof/ceilingassemblyabove,andshallbesecurelyattachedthereto.Exceptions:2.Wheretheroom-sidefire-resistance-ratedmembraneofthecorridoriscarriedthroughtotheundersideofthefloororroofsheathing,deckorslabofafire-resistance-ratedfloororroofabove,theceilingofthecorridorshallbepermittedtobeprotectedbytheuseofceilingmaterialsasrequiredfora1-hourfire-resistance-ratedfloororroofsystem.3.Wherethecorridorceilingisconstructedasrequiredforthecorridorwalls,thewallsshallbepermittedtoterminateattheuppermembraneofsuchceilingassembly.
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CorridorWalls– 708.4Exception2
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CorridorWalls– 708.4Exception3
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• 1”gypsumunderlayment• 19/32”WSP• 3½”FiberglassBatt• 2x10joists@24“oc• Resilientchannel• 5/8”Type-XGyp
Corridors- 1hrFloor
ULL502GAFC5104
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Corridordecking
Floorsheathing
Joisthangerifjoistsperpendiculartowall
Corridors- 1hrFloor
Untreated
FRTWood
Legend
Thinnerframingwithdroppedceilingallowsmainmechanicallinestorunincorridor
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Balconies– IBC1406.3
BalconiesofcombustibleconstructionandnotFRTshallbe:• Ratedinaccordancew/Table601forfloors• OrbeofTypeIV• Andshallnotexceed50%ofbldgperimeterExceptions• BalconiesinTypeIII,IVandVcanbeoftypeV
constandshallnothavefireresistanceratingifsprinklerprotectionprovided
• Untreatedwoodispermittedforrailsandguardrails
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Balconies– IBC1406.3
So….ForTypeIIIorVbalconyoptionsare:
1. Non-combustible– nosprinklers/nofirerating2. FRT– nofiresprinklers/nofirerating3. TypeIV– nofiresprinklers/nofirerating4. Nontreated– firesprinkler/nofirerating5. Nontreated– fireratedper601&602/nosprinkler
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Balconies– ExteriorWallPenetration
FloorsheathingFRTdecking
TopflangeJoisthangerapprovedtospan2layersGWB
Cantileverbeam
Cantileverknifeplatesupport
Exteriorveneerasoccurs
Caulking,sealantsvaporbarriers,and flashingnotshownforclarity
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Questions?
ThisconcludesTheAmericanInstituteofArchitectsContinuingEducationSystemsCourse
Visitwww.woodworks.org formoreeducationalmaterials,casestudies,designexamples,aprojectgallery,andmore
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