Post on 12-Mar-2020
Practical,Code-CompliantDetailingforMid-RiseWoodStructuresDetailingConsiderationsforMidRiseWoodFrameBuildings
“TheWoodProductsCouncil”isaRegisteredProviderwithTheAmericanInstituteofArchitectsContinuingEducationSystems(AIA/CES),Provider#G516.
Credit(s)earnedoncompletionofthiscoursewillbereportedtoAIACESforAIAmembers.CertificatesofCompletionforbothAIAmembersandnon-AIAmembersareavailableuponrequest.
ThiscourseisregisteredwithAIACESforcontinuingprofessionaleducation.Assuch,itdoesnotincludecontentthatmaybedeemedorconstruedtobeanapprovalorendorsementbytheAIAofanymaterialofconstructionoranymethodormannerofhandling,using,distributing,ordealinginanymaterialorproduct.________________________________Questionsrelatedtospecificmaterials,methods,andserviceswillbeaddressedattheconclusionofthispresentation.
CourseDescription
Withanincreaseinmid-risewood-framebuildings,moredesignersareseekinginformationoncode-compliantandconstructibledetailing.Manyareunsureofthecode’srequirementsfordetails,specificallyattheintersectionofratedassembliesandwherestructureandfireprotectionmeet.Thispresentationwillfocusoncommondetailingissuesandareasofmisunderstanding—includingfire-resistanceratingcontinuity,allowableusesofwoodframinginshaftandfirewalls,andfiresafetyprinciplesassociatedwiththeintersectionoftworatedassemblies.Mid-risewood-frameopportunitiesandcode-specifiedbuildingsizeswillalsobereviewed,followedbydiscussionofdetailingcoderequirements,codecompliance,andrationaleforapprovalwithanemphasisonconstructabilityandpracticality.
LearningObjectives
1. Discussallowableconstructiontypes,occupancies,andbuildingheightsandareasforwood-framemid-riseconstructionpertheInternationalBuildingCode.
2. Examineavarietyoffloor-to-exteriorwalldetailsforuseinwood-frame,TypeIIIconstructionanddiscusscodecompliancepathsandapprovalrationaleforeach.
3. Discusscode-permittedshaftwallandfirewallconstructionmaterialsandfire-resistancerequirements,andreviewcommondetailsforeach.
4. Considercodeprovisionsforcorridorandbalconyfire-resistanceprotection,andidentifydetailsthataccommodatetheserequirementswhilemaximizingwooduse.
Outline
• Mid-RiseConstructionTypes&LifeSafetyReview• StructuralDesign&DetailingConsiderations• ShrinkageConsiderations&Detailing• AcousticRequirements&Detailing• FireResistiveRequirementsandDetailing
Mid-RiseConstructionTypes
Materials ProtectedElements
LessProtectedElements
UnprotectedElements
Non-Combustible IA,IIA IB IIB
Combustible - - -
Mixed Systems IIIA IIIB -
HeavyTimber - IV -
AnyMaterials VA - VB
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
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
IBCBuildingSizeLimits
WithNFPA13Sprinklers:IBCgivesanallowableHeightsandAreaIncrease
IIIATabularHeightLimits IncreasedLimits
NFPA13
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
StellaApartmentsLocation:MarinaDelRay,CA244Apts.,650Ksf total(2bldgs)TypeIIIAandVAconstructionPanelizedwoodframingsaved1-2monthsconstructiontimeand$200,000
CaseStudy:StellaApartments
Architect:DesignARC.LosAngeles,CAPhotos:LawrenceAnderson,www.lawrenceanderson.net
Outline
• Mid-RiseConstructionTypes&LifeSafetyReview• StructuralDesign&DetailingConsiderations• ShrinkageConsiderations&Detailing• AcousticRequirements&Detailing• FireResistiveRequirementsandDetailing
Structural• Directbearing/noadd’l
hardware• Mayrequireloadtransfer
blockingforconcentratedloadsfromabove
• Wallsoleplateandfloorsheathingcrushingmayneedtobeconsidered
Constructability• Framingcanbecompletedbefore
drywallandinsulationareinstalled
• Commonlengthstuds
PlatformFraming
Semi-balloonFraming
Structural• Additionalhardware/nodirect
bearing• Noloadtransferblockingreq’dRatedAssemblies• Mayaccommodatecontinuity
inexteriorwallsinTypeIIIconstruction
Constructability• Framingcanbecompleted
beforedrywallandinsulationareinstalled
• Customlengthstuds• Canhelpminimizebuilding
shrinkage
ShearWallFramingConsiderations
TypicalFloorPlanShearWallLayoutIndicateswoodsheathedshearwall
ShearWallFramingConsiderations
• Typicalfloorplanresultsinshortersolidwallsections,offsetwalls,needformorecollectors,struts
• Shorterwalls=higherconcentratedloads• Higherconcentratedloads=tighternailing,largerholddowns&
endposts,possiblydoublesidedsheathing• Coderequirementsforwallheighttowidthratiosmustbemet• Accumulatedloadsfurtherconcentrateforcesinlowerlevel
walls
ShearWallFramingConsiderations
• Shearwallcomponentscanaffectotherbuildingfeatures
• EndPosts:Morewoodinwall=lessinsulation
• Sheathingoninteriorwallsaffectwallfinishes,acoustics
• Holddowns,endposts,blockingcanaffectin-wallutilities
• OpeningsinwallsforMEPcanaffectshearwallstrength
ShearWallConfigurationOptions
SolidorSegmentedWalls
PerforatedWallsForceTransferAround
OpeningsWalls
ShearWallHoldDownOptions
StandardHoldDownInstallation StrapHoldDown
Installation
……
……
……
…
Continuous Rod - Automatic Tensioning Systems
DiaphragmConsiderations
TypicalFloorPlanDiaphragmLayout
Open
DiaphragmConsiderations
• Typicalfloorplanresultsindiaphragmoffsets,re-entrantcorners,discontinuities,openings
• Diaphragmopenings,discontinuities=higherconcentrated,localizedloads
• Higherconcentratedloads=tighternailing,largerchord&strutloads,mayrequireblockeddiaphragm
• Coderequirementsfordiaphragmlengthtowidthratiosmustbemet
ShearWalltoPodiumSlabInterface
• AmplificationofseismicforcesisrequiredforelementssupportingdiscontinuouswallsperASCE7-1012.3.3.3
• Overstrength factorof3(maybereducedto2.5perfootnotegofTable12.2-1)isrequired
• AttachmenttoconcreteslabmustalsoconformtoACI318AppendixD
• TypicallywillbetransitioningfromASDforwooddesigntoLRFDforconcretedesign
• Holddownattachmentstoconcreteoptions:embeddednutsorplates,sleevesthroughslab,weldedstuds&reinforcing
PTSolePlatevs FRTContinuity
IntypeIIIconstructionwithFRTstuds,whathappenswherethesoleplateisincontactwithconcrete?
• FRTWisrequired• PTwoodisrequiredFRTcontainsabout10xboratecompoundfoundinPT(borateiswatersoluble)Canspecifyaproducttestedtodoboth
Outline
• Mid-RiseConstructionTypes&LifeSafetyReview• StructuralDesign&DetailingConsiderations• ShrinkageConsiderations&Detailing• Concepts• Calculations• Recommendations
• AcousticRequirements&Detailing• FireResistiveRequirementsandDetailing
IBC2012onShrinkage2304.3.3Shrinkage.Woodwallsandbearingpartitionsshallnotsupportmorethantwofloorsandaroofunlessananalysissatisfactorytothebuildingofficialshowsthatshrinkageofthewoodframingwillnothaveadverseeffectsonthestructureoranyplumbing,electricalormechanicalsystems,orotherequipmentinstalledthereinduetoexcessiveshrinkageordifferentialmovementscausedbyshrinkage.Theanalysisshallalsoshowthattheroofdrainagesystemandtheforegoingsystemsorequipmentwillnotbeadverselyaffectedor,asanalternative,suchsystemsshallbedesignedtoaccommodatethedifferentialshrinkageormovements.
KeyFactorsInfluencingShrinkage
• Pre-constructionmoisturecontent(MC)• In-serviceequilibriummoisturecontent(EMC)• Cumulativethicknessofcross-grainwood
contributingtoshrinkage
Woodspecieshasrelativelylittleimpactsincemostspeciesusedincommercialconstructionhavesimilarshrinkageproperties.
Moisturechangescausedimensionalchangesperpendiculartograin
Growingtreeisfilledwithwater
Aswooddries,itshrinksperp.tograin
BasicWoodShrinkageTheory
Image:WoodHandbook,WoodasanEngineeringMaterial,USDAForestService,ForestProductsLaboratory,2010
Wider&Thicker--- NOTTaller
ShrinkageinlumberexpectedACROSSthegrain.Longitudinalshrinkageisnegligible.
BasicWoodShrinkageTheory
BasicWoodShrinkageTheory
ZoneofMovementShrinkageoccursprimarilyinhorizontalmembers• Wallplates• Floor/rimjoists
Beawareofcumulativeshrinkage.
Pre-ConstructionMoistureContent
Mi=19%Mi=28%
MinimizeConstructionMoistureAccumulation
1. Minimizestorageofmaterialonsitewhererainandstandingwatercanincreasemoisturecontent.
2. Keepunusedframingmaterialcovered3. Inspectpre-builtwallpanelspriortoinstallationforproper
materialandqualityofmechanicalfasteners.4. “Dry-in”thestructureasquicklyaspossible.5. Immediatelyremoveanystandingwaterfromfloorframing
afterrainshowers.6. EnsurethatinstalledlumberMCisloweredto19%or
calculatedmaxMCbeforeinstallingfinishes&insulation
In-serviceAverageEMCinJuly
34
Map courtesy of US Forest Products Laboratory
In-serviceAverageEMCinJanuary
35
Map courtesy of US Forest Products Laboratory
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)
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)
CalculatingShrinkage– Resources
WoodHandbook:www.fpl.fs.fed.us• Chapter13– CT,CR• Chapter4– ST,SR
ExampleShrinkageCalculation
Assume:S-DrylumberFind:ShrinkageinPlates&FloorJoist
ShrinkageZone:2x4UpperPlate2x12FloorJoist4x4LowerPlate16.25”Total
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
MinimizingShrinkage
Semi-balloonframing• incorporatesfloorframing
hangingfromtopplates• Eliminatestangential
shrinkageinzoneofmovement
• Floorframingdoesn’tcontributetooverallbuildingshrinkage
Non-standardstudlengthsandincreasedhardwarerequirementsarearesult.
ExampleShrinkageCalculationAssume:S-DrylumberFind:Shrinkagein2x4UpperPlate&4x4LowerPlate
ShrinkageZone:2x4UpperPlate4x4LowerPlate5”Total
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
DifferentialMovement
Movementbetweenwoodframeelementsandothermaterialsthat…
• donotshrinkatall
• shrinkmuchless
• expand
Shrinkage&FinishConsiderations
Largeexpansesofinteriorandexteriordrywall,panelingandsidingneedtobelookedatspecifically.
Employexpansionjointandslip-typedetailing.
Attentiontointeractionofstructural(load-bearing)andnon-structuralelementsisnecessary
Shrinkage&MEPConsiderations
FullycompresswallframingbycompletingalldeadloadpotentialPRIORtomechanicalinstallations.
Avoidrigidverticalpipinginmechanicalandplumbingsystems.Flexiblemembersallowforshrinkagebetweenfloors.
MEPConsiderations
Verticalventstacksshouldbeinstalledaftercompletionofframing.
Ventstacksrequirespecialattentionandmustbedesignedtoallowforverticalmovementduetoshrinkagebetweenfloors.
MEPJointOptions
AvarietyofexpansionorslipjointconnectorsareavailablewhichaddressthisissueandallowverticalmovementinMEPitemsduetobuildingshrinkageand/orthermalchangewithoutcausingdamagetothem
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
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
FaçadeConsiderations- Resourceswww.woodworks.org
FaçadeConsiderations- Resources
BrickIndustryAssociation–www.gobrick.com
DoorandWindowConsiderations
Sealantjointsizedtoallowshrinkageofwoodframeandexpansionofbrick(typically¼”to½”perfloor)
DoorandWindowConsiderations
FlashingandCounterFlashingDetailedtoProvideVerticalFlashingSlipJointtoAccommodateMovement
Source:FPInnovations
DoorandWindowConsiderations
Gapunderflashingallowsverticalmovement
Source:CENews,Feb2014
DoorandWindowConsiderations
Source:CENews,Feb2014
ShrinkageEffectsonStructuralComponents
Strapholddownscanbucklewithtoomuchaccumulatedmovement.
Anchortypeholdownsshouldre-tightenedbeforeinstallingfinishes.
Threadedrodholdownswithshrinkagecompensatingdevicesworkwellfor4storiesandabovewithstackingunits.
Shrinkage&DeckConsiderations
WhitePaper:Multi-StoryWood-FrameShrinkageEffectsonExteriorDeckDrainage:ACaseStudybyZenoMartin,WoodDesignFocusFall2010
ShrinkageMitigatingDetailingTips
Bestpracticestomitigatedistresstofinishesarisingfromcumulativedifferentialmovement:• Beacutelyawareofthefactthattherewillbedifferentialmovement• Addressitindetailingandspecifications• Considerwheredistresswilloccur• Providedetailstorelieveoravoidit
Architects:CooperCarry&ThePrestonPartnershipPhoto:AerialPhotographyInc.
ShrinkageResources– www.wwpa.com
Outline
• Mid-RiseConstructionTypes&LifeSafetyReview• StructuralDesign&DetailingConsiderations• ShrinkageConsiderations&Detailing• AcousticRequirements&Detailing• FireResistiveRequirementsandDetailing
BuildingAcousticsOverview
Air-bornesound:• SoundTransmissionClass
(STC)Measureshoweffectivelyanassemblyisolatesair-bornesoundandreducesthelevelthatpassesfromonesidetotheother
Structure-bornesound:• ImpactInsulationClass
(IIC)Evaluateshoweffectivelyanassemblyblocksimpactsoundfrompassingthroughit
AcousticalCodeRequirements
IBCSection1207:
Min.STCof50(45iffieldtested)for:• AllWalls,Partitions,andFloor/CeilingAssemblies
whichseparateadjacentdwellingunitsoradwellingunitfromanadjacentpublicarea
Min.IICof50(45iffieldtested)for:• AllFloor/CeilingAssemblieswhichseparate
adjacentdwellingunitsoradwellingunitfromanadjacentpublicarea
AcousticalIsolationBetweenUnits
ClassDesignation Airborne SoundIsolation(STC)
FloorCeilingImpactIsolation(IIC)
EntryLevel 50 50
MarketRate 55 55
Luxury 60 60
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
Retail-to-Unit
TypicalFloor-CeilingDetailAlthoughcommonbetweenrestaurantsorbarsandtheapartments above,theconfigurationshowninthisdetailmayleadtonoisecomplaints byapartmentoccupants.
RatedAssemblies
OneofManyPerformanceGoals
UniversityofWashingtonStudentHousingSeattle,WAArchitect:MahlumThisfive-building projectincludes astrategiccombination ofstaggeredanddouble studwallstominimizesoundtransmission. Photo:BenjaminBenschneider
AcousticallyRatedAssemblies
ManyavailablefreeonlineSTC&IICratedassemblycharts(USG,GP,others)
AcousticallyRatedAssemblies
AirTightandInsulated
Examplesofineffectiveandeffectiveinstallation
PhotoDr.EnergySaver
ElectricalBoxes– AvoidFlankingPaths
Walls– DoubleStud
STC63PartyWallImage:tmsoundproofing.com
Walls– StaggeredandSingleStud
Afterdoublestudconstruction,thenextbestsolutionsarestaggeredandsinglestud.
Photos:RootGraphics(l);ArchWoodProtection
AcousticalDetailing
ImprovementFactor:Sheathing
Effectofsheathing placement onacoustical performance
ImprovementFactor:Insulation
Themostcost-effectiveacousticalimprovementtoasoundinsulationsystemistheadditionofbattinsulationoranyopencellfoamsystemtothestudorjointcavity.
PhotoDreamstime
ImprovementFactor:ResilientChannels
Metalchannelsfoundinwoodframing
Acoustical‘puckisolator’walldetail(isometricview)
ImprovementFactor:ResilientChannels
Properresilientchannelandfastenerinstallationiskeytotheperformanceofthesystem
Floor-CeilingSystems
AcousticalDetailing
Effectivefloor-ceilingoptionincludes:• Gypcreteorlight-weightconcrete• Impact isolationmatt• Tongueandgroovesubfloor(gluedandscrewedtothe joist)• Joistsystem(with6inchesofbattinsulation)• Resilient channelorpucksystem(resilient system)• Twolayersof5/8-inchtype“X”gypsumboard
ImpactIsolation
Impact IsolationProgression inWood-FrameFloors/Ceilings (SectionView)
Forclarity,battinsulationinthejoistcavityisnotshown
AdditionalAcousticsBestPractices
• Avoidcreatingflankingpaths• Isolatemechanicalsystemsbetweenunits• Sealopeningsinassemblies(whereairflows,sound
flows)• Avoidaligningdoorsonoppositesidesofcommon
hallways
Doorways– AvoidFlankingPaths
Avoidaligningdoorsonoppositesidesofcommonhallways
HVAC– AvoidFlankingPaths
Isolatemechanicalsystemsbetweenunits
AdditionalConsiderations
CrescentTerminusAtlanta,GAThree-building, five-storymixed-usecomplexwithresort-style amenities
PhotoCrescentCommunities
Outline
• Mid-RiseConstructionTypes&LifeSafetyReview• StructuralDesign&DetailingConsiderations• ShrinkageConsiderations&Detailing• AcousticRequirements&Detailing• FireResistiveRequirementsandDetailing
• ExteriorWalls• FloortoWallDetailing• InteriorWalls• ShaftWalls• Corridors&Balconies
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
FirePerformanceCo
mbu
stibility FireResistance
FlameSpreadClassificaiton
Fire-ResistanceRatedWallAssemblies
FireConfinement StructuralPerformance
Fire-ResistanceRating:Theperiodoftimeabuildingelement,componentorassemblymaintainstheabilitytoconfineafire,continuestoperformagivenstructuralfunction,orboth,asdeterminedbythetests,orthemethodsbasedontests,prescribedinSection703.Tested underastandardizedtestfireexposureforagivendurationto:
1. Preventthepassage offlameandtemperature risefromonesidetotheother
2. Continue toprovideverticalstructuralsupportwhenexposed tofireandelevatedtemperatures
Fire-ResistanceRatedWallAssemblies
There arefive basictypesoffire-resistanceratedwallassemblies:• LightFrameBearingWalls(IBC704.4.1)• ExteriorWalls(IBC705)
• FireWallorPartyWall(IBC706)• FireBarrier(IBC707)• FirePartition(IBC708)
LightFrameBearingWalls(IBC704.4.1)
Kingstuds,jackstuds,andboundaryelementsmayhavefire-resistanceratingprovidedbymembraneinloadbearingwall
Typ.BearingWallOpeningFraming
ExteriorWalls- FSD
Basicassumptionisthatfiresbeginattheinteriorandratedwallassembliesarenotrequiredfrom theexteriorunlessclosetoanotherstructure.
Interior
Exterior
FireProtectiononInsideofBuilding
ExteriorWalls(IBC705)705.5 FireResistanceRatings:Exteriorwallsshallbefire-resistanceratedinaccordancewithTables601and602andthissection.Therequiredfire-resistanceratingofexteriorwallswithafireseparationdistanceofgreaterthan10feet(3048mm)shallberatedforexposuretofirefromtheinside.Therequiredfire-resistanceratingofexteriorwallswithafireseparationdistanceoflessthanorequalto10feet(3048mm)shallberatedforexposuretofirefrombothsides.
Interior
Exterior
X<10’
LotLine
Table 601&602
ExteriorWallFireResistance
ExteriorWall– Bearingvs.NonBearing
Nonloading-bearingexteriorwallsmayhavelowerfireresistanceratingrequirementsthanbearingwallsincertainsituations.IBCChapter2definesloadbearingwallsas:
ExteriorWallFireRatings
• Usingtheprovisionsofsection705.5andTables601and602couldresultinrequiringa1houror2hourratingontheinsidefaceofexteriorwalls,whilenoratingisrequiredontheexteriorfaceofexteriorwalls.
• Howdowespecifysuchanasymmetricassembly?
• Thisiswhereprescriptivecodemethodologybeginstobreakdown:proceduraldatadoesnotalignwithrequirements.Mostbuildingjurisdictionsunderstandthatthisisadeficiencyofthesystemandwillrecognizeonetestedassemblyfortheoutsideandasecondfortheinside.
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
ExteriorWalls– 1HRInt.0HRExt.
ExteriorWalls– 1HRInt.0HRExt.
ExteriorWalls– 2HRInt.0HRExt.
ExteriorWalls– 2HRInt.0HRExt.
ExteriorWalls– 2HRInt.1HRExt.
ChoosingFireRatedAssembliesCommontestedassemblies(ASTME119)perIBC703.2:• ULListings• GypsumCatalog• ProprietaryManufacturerTests• IndustryDocuments:suchasAWC’sDCA3
AlternateMethodsperIBC703.3• PrescriptivedesignsperIBC721.1• CalculatedFireResistanceperIBC
722• Fire-resistancedesignsdocumented
insources• Engineeringanalysisbasedona
comparison• Fire-resistancedesignscertifiedby
anapprovedagency
ExteriorWalls– StructuralStability
705.6StructuralStability:ThewallshallextendtotheheightrequiredbySection705.11andshallhavesufficientstructuralstabilitysuchthatitwillremaininplaceforthedurationoftimeindicatedbytherequiredfire-resistancerating.Whereexteriorwallshaveaminimumfireseparationdistanceofnotlessthan30feet(9144mm),interiorstructuralelementswhichbracetheexteriorwallbutwhicharenotlocatedwithintheplaneoftheexteriorwallshallhavetheminimumfire-resistanceratingrequiredinTable601forthatstructuralelement.Structuralelementswhichbracetheexteriorwallbutarelocatedoutsideoftheexteriorwallorwithintheplaneoftheexteriorwallshallhavetheminimumfire-resistanceratingrequiredinTables601and602fortheexteriorwall.
ExteriorWalls– VerticalOffsets
NolessthanSameratingaswallabove
Exteriorwall
Exteriorwall
Thereisnorequirementforanexteriorwalltoextendtothefoundationinasteppedbuilding.
Posts,beamsorwalls,thatsupportaratedexteriorwallmustbefire–resistanceratednotlessthantheratingofthesupportedwall(IBC704.1)
ExteriorWalls– AdditionofWSP
CanincludeWSPinassemblieswhichweretestedwithoutthem:
• ESR2586• AWC’sDCA4
• GypsumAssociationManual
GAFireResistanceDesignManualitem23inSection1oftheGeneralExplanatoryNotes:"Whennotspecifiedasacomponentofafire- resistanceratedwallorpartitionsystem,woodstructuralpanelsshallbepermittedtobeaddedtooneorbothsides.”
ESR2586:
ExteriorWalls– UsingFRTStuds
“Woodstudwallsmaycontainfire-retardant-treatedstudsaswellasuntreatedwoodstuds.Theuseoffire-retardant-treatedplywood(woodstructuralpanels)maybeusedinDesignsthatcontainuseofuntreatedplywoodwhenallotherspecifiedattributesareequivalenttothewoodstructuralpanelusedintheDesign.”
Outline
• Mid-RiseConstructionTypes&LifeSafetyReview• StructuralDesign&DetailingConsiderations• ShrinkageConsiderations&Detailing• AcousticRequirements&Detailing• FireResistiveRequirementsandDetailing
• ExteriorWalls• FloortoWallDetailing• InteriorWalls• ShaftWalls• Corridors&Balconies
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
IntersectionofTestedAssemblies2Ho
urW
all
IntersectionofTestedAssemblies
1HourFloor
IntersectionofTestedAssemblies• Manyoptionsareavailableforfireresistance
testedfloorassembliesandwallassemblies• Notestedintersectiondetailsexist• Wemustunderstandtheintent ofthecode,
providearationalethatmeetsthecode’sintent,andutilizeavailableinformationandtestingresults
2HourWall
1HourFloor
2HourWall
TypeIIIExteriorWalls– FRT
TypeIIIandIVConstruction- IBCSection602.3:Fire-retardant-treatedwoodframingcomplyingwithSection2303.2shallbepermittedwithinexteriorwallassembliesofa2-hourratingorless
WhatdoesthisFRTWrequirementinclude?• WallFraming(Studs&Plates)– Yes• WallSheathing– YesFloorsheathing?RimJoist?FloorJoists?Everythingintheplaneofthewall?Oronlywallframing?
ExteriorWalls– IntersectingFloors
SomejurisdictionsinterprettheallowanceofFRTframing inexteriorwallsoftypeIIIconstructionasnotincludingFRTwallsheathing.TheinclusionofwallsheathingisintendedintheallowanceofFRTframing.
Severalcodechangeproposalsareinplacewhichclarifythis
ExteriorWalls– IntersectingFloors
Pleasenotethatthefollowingdetailsareexamplesofwhatwehaveseenusedonprojectsanddonotnecessarilyrepresentdetailsthatwillbeacceptedandapplicableinalljurisdictionsandtoallprojects.
Thesedetailsarenotintendedasrecommendationsforuniversallyaccepteddetails.Localproductavailabilityandmanufacturerspecificationsshouldalsobeconsideredforeachproject.
TheArchitectofRecordandEngineerofRecordshouldverifyacceptanceofthedetailsusedontheirprojectwithallprovisionsofthebuildingcode,includinglocalamendments,withthelocalAuthorityHavingJurisdiction.
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
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
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
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
CalculatedFireResistanceofWood
ForExposedWoodMembers:IBC722.1ReferencesAWC’sNDSChapter16(AWC’sTR10isadesignaidtoNDSChapter16)
EquationsforCalculatingFireEndurance• Assumptions• Nominalassumedcharrate=1.5”/hr.• Usesultimatestrengthfordesigncheck
• Structurallyspanningmembers:reducedsectioncheckedforcapacityvs.demand
Source:AWC’sTR10
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
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
ExteriorWalls– IntersectingFloors
Floorsheathing
FRTsheathing
Joisthanger
UntreatedorFRT
FRTWood
LegendTypeIIIConstruction– 2HRWall,1HRFloor
Semi-BalloonFraming
Rationalefordetailapproval:• Intersectionofrated
assemblies(wall&floor)consideredsufficient
UntreatedFloorJoistOptions:• SolidSawn• Trusses• I-Joists
Blocking
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
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
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
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
ExteriorWalls– IntersectingFloors
Floorsheathing
FRTsheathing
TopflangeJoisthangerapprovedtospan2layersGWB
UntreatedorFRT
FRTWood
LegendTypeIIIConstruction– 2HRWall,1HRFloorSemi-BalloonFramingw/Add’l FireProtection
Rationalefordetailapproval:• Membranesonbothside
ofwallprovidefireresistanceviatheirapprovedassembly
UntreatedFloorJoistOptions:• SolidSawn• Trusses• I-Joists
OverGypsumHangers
CommonlycalledFireWallorDrywallHangers
OverGypsumHangers
TopFlangeHangers&FaceMountHangersAvailable
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
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
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
Point#1ofInterpretation:Continuityof2hfirerating•
•Floorsheathing
FRTsheathing
Blocking
TypeIIIConstruction– 2HRWall,1HRFloorPlatformFramingw/TopChordBearing
ExteriorWalls– IntersectingFloors
Rationalefordetailapproval:• Membraneson
bothsideofwallprovidefireresistanceviatheirapprovedassembly;atfloorcavityblockinginwallprovides1hr;1layerofwallmembraneprovides2nd hr
UntreatedorFRT
FRTWood
Legend
Untreated
Topflangetrusshanger
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
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
ExteriorWalls– IntersectingFloors
ExteriorWalls– IntersectingFloors
Gapsbtwnendoftrussmembersandwalltoallowgypsuminstallafter
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
Floorsheathing
FRTsheathing
ExteriorWalls– IntersectingFloorsTypeIIIConstruction– 2HRWall,1HRFloorPlatformFramingw/TopChordBearing
UntreatedorFRT
FRTWood
Legend
Untreated
Rationalefordetailapproval:• Intersectionof
ratedassemblies(wall&floor)consideredsufficient
2xribbon
Floorsheathing
FRTsheathing
ExteriorWalls– IntersectingFloorsTypeIIIConstruction– 2HRWall,1HRFloorPlatformFramingw/TopChordBearing
UntreatedorFRT
FRTWood
Legend
Untreated
Rationalefordetailapproval:• Membraneson
bothsideofwallprovidefireresistanceviatheirapprovedassembly;atfloorcavityblockinginwallprovides1hr;ceilingprovides2nd hr
Blockingbetweenfloortrusses
2xribbon
Floorsheathing
FRTsheathing
ExteriorWalls– IntersectingFloorsTypeIIIConstruction– 2HRWall,1HRFloorPlatformFramingw/TopChordBearing
Rationalefordetailapproval:• Membranes
onbothsideofwallprovidefireresistanceviatheirapprovedassembly
InfillWallFramingBetweenTrusses
WallGypsumExtendstoUndersideofFloorSheathingBetweenTrusses
UntreatedorFRT
FRTWood
Legend
Untreated
ExteriorWalls– IntersectingFloors
ExteriorWalls– Bearingvs.Non-Bearing
Non-bearingExteriorWalls
PerimeterStructuralBeams
Utilizationofstructuralbeamsin-boardordirectlyoverexteriorwallscanmakewallsnon-bearingandreducerequiredfireresistanceratingto1HRor0HR(IBCTable602)Note:Beams&Columnswillmostlikelybeconsidered“PrimaryStructuralFrame”&requireindividualencasementperIBC704
FloorFraming
PerimeterStructuralColumns
ExteriorWalls– Bearingvs.Non-Bearing
Ifframingparalleltolongexteriorwallsispossible,minimizesareaofloadbearingexteriorwalls
TypeIIIConstructionDetailExamples
Whatisbeingenforcedinjurisdictionsyouareworkingin?
Outline
• Mid-RiseConstructionTypes&LifeSafetyReview• StructuralDesign&DetailingConsiderations• ShrinkageConsiderations&Detailing• AcousticRequirements&Detailing• FireResistiveRequirementsandDetailing
• ExteriorWalls• FloortoWallDetailing• InteriorWalls• ShaftWalls• Corridors&Balconies
InteriorFire-RatedWalls:Differences
Firewalls
• BuildingSeparation
• Openingsareprotected
• Continuousfromfoundationto/throughroof
• Structuralstability
FireBarrier
• Shafts,OccupancySeparation
• Continuousfromfloorthroughconcealedspace
FirePartition:
• DwellingUnitSeparation;Corridors
• Openingsareprotected
• Mayterminateatafireratedfloor/celiling/roofassembly
FireWalls– Ratings&Materials
IBC706.3– Firewallsshallbeofanyapprovednon-combustiblematerials.
Exception:BuildingsofTypeVconstruction
FireWalls– Ratings&Materials
OpportunityforWoodFramedFireWalls:• PermittedintypeVConstruction• FireWallsintypeVConstructionofA,B,E,Rand
severalotheroccupanciesmaybe2hourFireWallsintypeIIIandIVconstructionarerequiredtobeconstructedofnon-combustiblematerials• Opportunityforwoodframebearingwallsoneach
sideoffirewalltomeetstructuralstabilityrequirements
FireWalls– StructuralStability
706.2StructuralStability:Firewallsshallhavesufficientstructuralstabilityunderfireconditionstoallowcollapseofconstructiononeithersidewithoutcollapseofthewallforthedurationoftimeindicatedbytherequiredfire-resistanceratingorshallbeconstructedasdoublefirewallsinaccordancewithNFPA221.
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
2HourFireWallAssembly
ConstructionType:• V
2HourFireWallAssembly
ConstructionTypes:• III• IV• V
AlsoseeULU336
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
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
2HourFireWallAssembly
ConstructionTypes:• III• IV• V
Caninstallwoodbearingwalloneachsideof2hourwall
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
3HourFireWallAssembly
• (2)1”TypeXGypsum• 2”HStuds• 2”mineralfiberinsulation
eachside
ConstructionTypes:• III• IV• V
Couldinstallwoodbearingwalloneachsideof3hourwall
3HourFireWallAssembly
Couldinstallwoodbearingwalloneachsideof3hourwall
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
FireWalls– SeismicDiaphragmContinuity
FireBarriers– IBC707
Commonlyusedin:• Shaftenclosures• Interiorexitstairway• Exitstairwayenclosures• Exitpassageways• Incidentaluses• Separatedoccupancies• FireAreas
2012IBCCode&Commentary
FireBarrierExample
FireBarriers– IBC707FireBarriers:§ Maybeconstructedwithanymaterialspermittedbythe
constructiontype§ FireResistanceRatings:• ShaftEnclosures:IBC713.4
• 2Hr whenconnecting4storiesormore,1hr ifless• SeparatedOccupancies:IBCTable508.4• FireAreas:IBCTable707.3.10
FireBarriers– IBC707
707.5:Continuity:Firebarriersshallextendfromthetopofthefoundationorfloor/ceilingassemblybelowtotheundersideofthefloororroofsheathing,slabordeckaboveandshallbesecurelyattachedthereto.Suchfirebarriersshallbecontinuousthroughconcealedspace,suchasthespaceaboveasuspendedceiling
707.5.1SupportingConstruction:Thesupportingconstructionforafirebarriershallbeprotectedtoaffordtherequiredfire-resistanceratingofthefirebarriersupported.Hollowverticalspaceswithinafirebarriershallbefireblocked inaccordancewithSection718.2ateveryfloorlevel.
Otherrequirementsforopenings,penetrations,joints
FireBarriers– IBC707
CommonDetailingMethod:FireBarrier&membraneextendtoundersideoffloordeckabove
FirePartitions– IBC708
Commonlyusedtoseparate:• Dwellingorsleeping
unitsinsamebldg.• Tenantspacesinmalls• CorridorwallsMinimum1hr ratingexcept:• Somecorridors• Separatedwellingunits
inVBandIIB
2012IBCCode&Commentary
FirePartitionExample
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.
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.
FirePartitions– IBC707
CommonDetailingMethod:FirePartition&membranestopatundersideofratedfloor/ceilingwithfireblocking/draftstopping ifrequired
Outline
• Mid-RiseConstructionTypes&LifeSafetyReview• StructuralDesign&DetailingConsiderations• ShrinkageConsiderations&Detailing• AcousticRequirements&Detailing• FireResistiveRequirementsandDetailing
• ExteriorWalls• FloortoWallDetailing• InteriorWalls• ShaftWalls• Corridors&Balconies
Detailing:ShaftWallsvs.ExteriorWalls
IBC713.2:ShaftWallsshallbeconstructedasFireBarriers
KeyDifferencesbetweenExteriorWallsandShaftWalls(FireBarriers)• Continuity• SupportingConstruction• FireResistanceRatings• ConstructionMaterials
Detailing:ShaftWallsvs.ExteriorWalls
ShaftWallRequirements:
707.5:FireBarrierContinuity:• Mustextendfromtopofthefoundationorfloor/ceiling
assemblybelowtotheundersideofthefloororroofsheathing
• Throughconcealedspaces
707.5.1:SupportingConstruction:• Thesupportingconstructionfora
firebarriershallbeprotectedtoaffordtherequiredfire-resistanceratingofthefirebarriersupported.
Detailing:ShaftWallsvs.ExteriorWalls
ShaftWallRequirements:
713.4Fire-ResistanceRating:• 2hours(4storiesormore)• 1hour(lessthan4stories)• Numberofconnectedstoriesincludesbasementbutnot
mezzanine• Fireratingshallnotbelessthanfloorassemblypenetrated,
butneednotexceed2hours
707.2:ConstructionMaterials:• Anypermittedbyconstructiontype• FRTWnotrequiredforshaftwallsintypesIII,IV,V
Detailing:ShaftWallsvs.ExteriorWalls
Howdoweachievetheserequirements?
Continuity:Thegeneralrequirementsin707.5werenotwrittenwithplatformconstructioninmind...theywereattemptingtoprecludelargeopenconcealedspacestoprovideacontinuousbarrierbetweenoneportionofthebuildingandanother
Manyjurisdictionshaverecognizedthatcontinuityofthefirebarrier’sfireprotectioncanbemaintainedevenifthewallframing doesnotextendtotheundersideofthedeckingabove
Detailing:ShaftWallsvs.ExteriorWalls
SupportingConstruction:Musthavesamefireresistanceratingasfirebarrierbeingsupported
Detailing:ShaftWallsvs.ExteriorWalls
SupportingConstruction:Inplatformandsemi-balloonframeconstruction,ifwehavea2hourshaftwallanda1hourfloor,howdoweachievethis?Ifweareabletodemonstratethewall’s2hourcontinuity,shouldnotneedtoconsiderthefloor“supportingconstruction”?
1HourFloor
2HourWall
Detailing:ShaftWallsvs.ExteriorWalls
TypesofShafts:• Elevator• Stair• Mechanical
Somepointsofshaftwallconstructionapplytoanytypeofshaft.Someareuniquetoeachtypeofshaft.
ShaftWalls
ShaftWalls
MasonryShaftWalls
MasonryShaftWalls
MasonryShaftWalls
MasonryShaftWalls
Mixingmasonryshaftwallswithwoodfloorframingcancreateseveralissues:• Masonryshaftwallscanbecomepartofbuilding’s
lateralforceresistingsystem,increasingseismicforcesandaddingmass
• Differentialshrinkagebetweenwoodandmasonry
• Bestpracticesincludeseismicallyisolatingmasonryshaftwalls,onlytiewoodfloortomasonryshaftwhererequired(i.e.atelevatordoorthreshold)
MasonryShaftWalls
CMUshaftwall
MasonryShaftWallDetail
Floorframingandwoodbearingwalls
MasonryShaftWalls
CMUshaftwall
MasonryShaftWallDetail
Floorbeam,joists&sheathing
ShaftWallMaterialChoice
Whydoweintroducenewmaterialsforourshaftwalls?Theycanbeframedwithwood!
WoodFramedShaftWalls
WoodFramedShaftWalls
Usingwoodframedshaftwallscan:• Eliminatelateralloadconsiderationsassociatedwithattaching
wooddiaphragmstoconcreteormasonryshaftwalls(SDPWS4.1.5)
• Eliminatedifferentialshrinkageatfloortowalltransition• Eliminatedifferentconstructiontradesinbuildingduring
construction• Reducecosts• Improveschedule
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
ShaftWallDetails
Rationalefordetailapproval:• Membranesonbothsidesofwallprovidefire
resistanceviatheirapprovedassemblyandarecontinuous.FRTfloorsheathingcanbeinsuranceforminimalpenetrationofmembrane.
ShaftSide FloorSide
ShaftWallsw/Shaftliner
Rationalefordetailapproval:• Shaftlinerassemblyprovidesfireresistance
independentofframingmaterialoneitherside.
ShaftSide FloorSide
Floorsidewallprovidestypicalfloorsupport
Shaftliner inH-studsattachedtowallwithclips
Shaftsidewallprovidesshaftframing(stair,elevatorrail)support
ShaftWallsw/HStuds&Shaftliner
Source:GeorgiaPacific
Source:USGypsum
ShaftWallsw/HStuds&Shaftliner
SingleWallOption
Source:ULU375DoubleWallOption
ShaftWallsw/HStuds&Shaftliner
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
ShaftWallsw/ShaftlinerCanalsoutilizewoodframedshaftwallson3sidesandCHstudswithshaftliner on4th side
ShaftWallsw/CHorCTStuds2hourwallswithC-HStuds,shaftliner,and
gypsumpanels
ShaftWallsw/CHorCTStuds
ShaftWallsw/CHorCTStuds
Somewallmanufacturerswilllistatotalsystemheightlimitation.Ifthisisnotarequirementofthetestedassembly(i.e.ULorsim.requirement)canalsoperformastructuralanalysisofthewalls,especiallywhenstackingmultiplestories,toverifyadequacy
Source:Clarkdietrich
StairwayShaftEnclosures&FramingWoodFramedWallon
3SidesofShaft
CHStudsw/Shaftlineron4th SideofShaft
ElevatorShaftWalls
ElevatorShaftWalls
WoodFramedElevatorShaftWall
WoodFramedElevatorRailSupports
WoodFramedElevatorRailSupports
WoodFramedElevatorRailDetails
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
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
StairShaftWalls
StairShaftWalls
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
ShaftWalls
WoodFramedStairShaftWalls
WoodFramedStairShaftWalls
WoodFramedStairShaftWalls
StairwayShaftEnclosures&Framing
TypicalFloorjoist
StairFraming(Landing&Stringers)
Attachmentofstairframingtoshaftwallthroughgypsum,typically2layers
Shaftwall
Stair&FloorCommonWallDetail
Rationalefordetailapproval:• 2layersofwallmembrane
provide2hr protection
StairwayShaftEnclosures&Framing
TypicalFloorjoist
Shaftwall
Stair&FloorCommonWallDetail
Rationalefordetailapproval:• Membranesonbothsideof
wallprovidefireresistanceviatheirapprovedassembly
IntermediateStairLanding
FramingAttachledgertoeachshaftwallstudwithfasteners(woodscrews,lagscrews)designedtoaccountforgypsum
StairShaftSide
FloorSide
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
StairwayShaftEnclosures&Framing
IntermediateStairLanding
WhenStairShaftWallisExteriorWall
WallPlatesatTypicalFloorElevation– CreatesPotential“Hinge”
StairwayShaftEnclosures&Framing
IntermediateStairLanding
Framing Attachledgertoeachshaftwallstudwithfastenersdesignedtoaccountforgypsum
Shaftwall
StairExteriorWallDetail
Rationalefordetailapproval:• Membranesonbothsideof
wallprovidefireresistanceviatheirapprovedassembly
StairShaftSide
ExteriorSideConsider“Hinge”atwallplatesforout-of-planewind&seismicloadsduetolackofadjacentfloor:• Spanplateshorizontally• Installadditional
member(rim)tospanhorizontally
StairwayShaftEnclosures&Framing
StairwayShaftEnclosures&Framing
StairwayShaftEnclosures&Framing
StairwayShaftEnclosures&Framing
IntermediateStairLanding
Framing Attachledgertoeachshaftwallstudwithfastenersdesignedtoaccountforgypsum
Shaftwall
StairExteriorWallDetail
Rationalefordetailapproval:• Membranesonbothsideof
wallprovidefireresistanceviatheirapprovedassembly
StairShaftSide
ExteriorSideConsider“Hinge”atwallplatesforout-of-planewind&seismicloadsduetolackofadjacentfloor:• Installadditional
member(rim)tospanhorizontally
StairwayShaftEnclosures&Framing
StairwayShaftEnclosures&Framing
IntermediateStairLanding
ExteriorWallPlateElevationsShiftedDowntoIntermediate
LandingElevation
• EliminatesHingeEffect• AvoidsInterferencewith
LandingWindows
WhenStairShaftWallisExteriorWall
StairwayShaftEnclosures&Framing
IntermediateStairLanding
Framing Attachledgertoeachshaftwallstudwithfasteners(woodscrews,lagscrews)designedtoaccountforgypsum
Shaftwall Wallplateelevationsshiftedtointermediatelandingelevationatstairshafts
StairExteriorWallDetail
Rationalefordetailapproval:• Membranesonbothsideof
wallprovidefireresistanceviatheirapprovedassembly
StairShaftSide
ExteriorSide
StairwayShaftEnclosures&Framing
IntermediateStairLanding
Framing
Topflangejoisthangerapprovedtospan2layersGWB
ShaftwallWallplateelevationsshiftedtointermediatelandingelevationatstairshafts
StairExteriorWallDetail
Rationalefordetailapproval:• Membranesonbothsideof
wallprovidefireresistanceviatheirapprovedassembly
StairShaftSide
ExteriorSide
StairwayShaftEnclosures&Framing
StairLandingFraming
Attachledgertostudswithfasteners(woodscrews,lagscrews)designedtoaccountfor1layerofgypsum
Shaftwall Blockinginshaftwallbetweenstuds
Wallplatesattypicalfloorelevation
LedgerInterruptsOneLayerofShaft
WallGypsum
StairWallDetail
Rationalefordetailapproval:• Membranesonbothsideof
wallprovidefireresistanceviatheirapprovedassembly;atfloorcavity,blockinginwallprovides2nd hr
StairShaftSide
ExteriorSide
StairwayShaftEnclosures&Framing
StairLandingFraming Attachledgertoblocking
withfasteners(woodscrews,lagscrews)
Shaftwall2layersofblockinginshaftwallbetweenstudstoprovide2hoursprotection&ledgerfastenerattachment
Wallplatesattypicalfloorelevation
StairWallDetail
Rationalefordetailapproval:• Membranesonbothsideof
wallprovidefireresistanceviatheirapprovedassembly;atfloorcavity2layersofblockinginwallprovide2hr protection
StairShaftSide
ExteriorSide
StairwayShaftEnclosures&Framing
IntermediateStairLanding
Framing
Shaftwall Wallplateelevationsshiftedtointermediatelandingelevationatstairshafts
StairExteriorWallDetail
Rationalefordetailapproval:• Membranesonbothsideof
wallprovidefireresistanceviatheirapprovedassembly
StairShaftSide
ExteriorSide
Installspanningbeamjustinboardofshaftwall -onlypenetratewallatendofbeamlocations–requiresintermediateheightposts
FloorBm
StairwayShaftEnclosures&Framing
Wallplateelevationsshiftedtointermediatelandingelevationatstairshafts
StairExteriorWallDetail
Rationalefordetailapproval:• Membranesonbothsideof
wallprovidefireresistanceviatheirapprovedassembly
StairShaftSideExteriorSide
Shaftwall
IntermediateLandingFloorSheathingmayStopatLandingWallifLandingWallisAdequatelyBraced
Landingandstairframingsupportedonindependent
bearingwalls– shouldconsiderlateralbracingof
independentwalls
IntermediateStairLanding
Framing
StairwayShaftEnclosures&Framing
StairFraming(Landing&Stringers)
Landingandstairframingsupportedonindependentbearingwalls– shouldconsiderlateralbracingofindependentwalls
Shaftwall
Wallplatesattypicalfloorelevation
Rationalefordetailapproval:• Membranesonbothsideof
wallprovidefireresistanceviatheirapprovedassembly
StairWallDetail
StairShaftSide ExteriorSide
StairwayShaftEnclosures&Framing
ExteriorBearingWall
LandingFramingElev.=94’-8”
CorridorFramingElev.=100’-0”
Floo
rFraming
Elev.=100
’-0”
IndicatesDownwardStairTravelPath
LandingFramingElev.=100’-0”
Floo
rFraming
Elev.=100
’-0”
IntermediateLandingBeamConcentratedLoad
StairwayShaftEnclosures&Framing
IntermediateStairLanding
Framing
Shaftwall
StairExteriorWallDetail
Rationalefordetailapproval:• Membranesonbothsideof
wallprovidefireresistanceviatheirapprovedassembly;atfloorcavitybeamoversizedtoprovide2hourcharprotection
StairShaftSide
ExteriorSide
IntermediateLandingBeamExtendsintoShaftWall– OversizetoProvide2HourFireProtectionUsingCalculatedCharRates
StairwayShaftEnclosures&Framing
2Hr protectionprovidedall
aroundbeamvia.blocking
Beambearsdirectlyonaxiallyloadedpost–shrinkageconcernsareminimized
Outline
• Mid-RiseConstructionTypes&LifeSafetyReview• StructuralDesign&DetailingConsiderations• ShrinkageConsiderations&Detailing• AcousticRequirements&Detailing• FireResistiveRequirementsandDetailing
• ExteriorWalls• FloortoWallDetailing• InteriorWalls• ShaftWalls• Corridors&Balconies
Corridors– FireResistanceRatings
CheckrequirementsofIBCTables601and1018.1forCorridorWallandFloor/CeilingFire-ResistanceRatings
Corridors– FireResistanceRatings
CorridorWalls
IBC1018.1:Corridorwallsrequiredtobefire-resistanceratedshallcomplywithSection708forfirepartitions.
708.3Fire-resistancerating.Firepartitionsshallhaveafire-resistanceratingofnotlessthan1hour.
Exception:Corridorwallspermittedtohavea1/2hourfire-resistanceratingbyTable1018.1(appliestoRoccupancieswithsprinklersystems)
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.
CorridorWalls– 708.4Exception2
CorridorWalls– 708.4Exception3
• 1”gypsumunderlayment• 19/32”WSP• 3½”FiberglassBatt• 2x10joists@24“oc• Resilientchannel• 5/8”Type-XGyp
Corridors- 1hrFloor
ULL502GAFC5104
Corridordecking
Floorsheathing
Joisthangerifjoistsperpendiculartowall
Corridors- 1hrFloor
Untreated
FRTWood
Legend
Thinnerframingwithdroppedceilingallowsmainmechanicallinestorunincorridor
Balconies– IBC1406.3
BalconiesofcombustibleconstructionandnotFRTshallbe:• Ratedinaccordancew/Table601forfloors• OrbeofTypeIV• Andshallnotexceed50%ofbldgperimeterExceptions• BalconiesinTypeIII,IVandVcanbeoftypeV
constandshallnothavefireresistanceratingifsprinklerprotectionprovided
• Untreatedwoodispermittedforrailsandguardrails
Balconies– IBC1406.3
So….ForTypeIIIorVbalconyoptionsare:
1. Non-combustible– nosprinklers/nofirerating2. FRT– nofiresprinklers/nofirerating3. TypeIV– nofiresprinklers/nofirerating4. Nontreated– firesprinkler/nofirerating5. Nontreated– fireratedper601&602/nosprinkler
Balconies– ExteriorWallPenetration
FloorsheathingFRTdecking
TopflangeJoisthangerapprovedtospan2layersGWB
Cantileverbeam
Cantileverknifeplatesupport
Exteriorveneerasoccurs
Caulking,sealantsvaporbarriers,and flashingnotshownforclarity
Questions?
ThisconcludesTheAmericanInstituteofArchitectsContinuingEducationSystemsCourse
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