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United States Gypsum Company 550 West Adams Street, Chicago, IL 60661-3676 t 312.606.4000 f 312.606.4000 usg.com
Life safety assurance for
modern building designs
Shaft Wall Systems
Walls that enclose elevator shafts, stairwells and other vertical shafts are the lifeline of a building. Should a fire occur, firefighters control the use of elevators, leaving stairwells as the only means for occupant egress or rescue within the building. Since these walls are an important part of the building, they must have the strength to withstand lateral loads and provide needed fire protection.
High-Performance Shaft Walls
3 USGShaftWallSystems
User’s Guide
This brochure explains: – What a shaft wall system comprises – The different applications where shaft wall systems can be used – How to select and specify the appropriate components of a shaft
wall system
Pages
UnderstandYourSystem 4 Overview
Applications
Components
PerformanceTesting
SelectYourSystem 14 PerformanceSelector
LimitingHeights
SolidShaftWall
LimitingSpans
DesignYourSystem 21 DesignDetails
GoodDesignPractices
SpecifyYourSystem 33 ApplicationGuideSpecifications
ForMoreInformation TechnicalService 800USG.4YOU
Websites usg.com usgdesignstudio.com
4 USGShaftWallSystems
Overview
USG shaft wall systems are non-loadbearing gypsum wall partition assemblies constructed from outside the shaft at each floor. Shafts are enclosed early in construction, and the walls are finished later, along with interior partitions. Installation is quick and easy, using components and application procedures familiar to drywall contractors. This system installs faster than other multilayer gypsum panel systems because it is installed from one side, leaving the shaft free of scaffolding. The assemblies are constructed of gypsum liner panels friction-fitted into C-H studs in a progressive manner, with gypsum panels, gypsum fiber panels or cement board applied to the face.
TypicalShaft
WallAssembly
1"Sheetrockgypsumlinerpanels1"Sheetrock Mold toughlinerpanels1"Sheetrockglass-matlinerpanels
Utilitychase
USGC-Hstud
USGC-Hstud
USGJ-runner
TwoUSGJ-runners
Sheetrockgypsumpanels
Sheetrockgypsumpanels
Elevatorcar
Elevatorshaft
Elevatorshaftdoorframe
1"Sheetrocklinerpanels
5 USGShaftWallSystems
Applications
Use USG shaft wall systems to construct elevator shafts, mechanical shafts, stairwells, air return shafts and horizontal membranes. These shafts are vital for vertical communication, power, water, fresh air, exhaust and a means of egress.
Walls IntermittentAirPressureLoads
Elevatorshafts Stairshafts
Idealforelevatorshaftssincethewallscanbeconstructed Accommodatesstairshaftsbyallowingbothsidesof
fromoneside,leavingtheshaftfreeofscaffolding.This thewalltobefinishedwhenrequired.Foraddedabuse
allowselevatorequipmenttobeinstalledsimultaneously. resistanceinstairwells,facelayerpanelscanbe
substitutedwithFiberockabuse-resistantpanels.
IntermittentAirPressureLoads SustainedPressureLoads
Mechanicalshafts Airshafts(unlined)
VerticalHVACpipingandductworkcaneasilybe Thesystemcanalsobeusedforverticalairshafts
containedwithinthesystem,aswellasallowingforwall withinthebuilding.Shaftscanbeunlinedwhenspecific
penetrationswhenrequired. conditionsaremet.Unlinedshaftwallscanaccommodate
sustainedairpressureupto10psf.
6 USGShaftWallSystems
Applications
Walls SolidShafts HorizontalStudShafts
Solidshaftsarenormallyusedinareaswhereasmall Forcertainapplications,equipmentlimitationssometimes
sectionofshaftwallisneededforasingleverticalpipe makeitdifficulttoinstallshaftlinerpanelsandstuds
penetration.Thesolidshaftisstructurallylimitedtoa vertically.Thisistrueforwallsseparatingshaftswhenthere
heightof12feet,sincethesystemhasnostuds. isonlyastructuralbeamprovidedforsupportingthewall.
Ceilings ShaftWallCeilingMembrane
Thesystemcanalsobeinstalledhorizontallywhena
horizontalfire-ratedmembraneisrequired.Forone-
andtwo-hourfireratingsrefertoICCEvaluationReport
NER-258orProgressiveEngineeringReportAER-09038.
7 USGShaftWallSystems
Components
USG shaft wall systems have been comprehensively tested for fire resistance ratings only when all of the system components are used together. Substitutions of any of the components are not recommended and are not supported by USG. Refer to the appropriate product material safety data sheet for complete health and safety information.
GypsumLinerPanels Sheetrock®BrandGypsumLinerPanels
–High-performancepanelshaveanoncombustiblecoreencasedinawater-resistant100%recycledgreenfaceand
backpaper
–UnderwritersLaboratories(UL)/UnderwritersLaboratoriesCanada(ULC)Classifiedforfireresistance
–Panelsare1"thickand24"widewithbevelededges
–RefertoproductsubmittalsheetWB2278formoreinformation
Sheetrock®BrandMold tough™GypsumLinerPanels
–High-performancepanelshaveanoncombustibleandmoisture-andmold-resistantgypsumcoreenclosedina
moisture-andmold-resistant,100%recycledbluefaceandbackpaper
–UL/ULCClassifiedastofireresistance
–Panelsare1"thickand24"widewithbevelededges
–RefertoproductsubmittalsheetWB2389formoreinformation
Sheetrock®BrandGlass-MatLinerPanels
–High-performancepanelshaveanoncombustibleandmoisture-andmold-resistantgypsumcoreenclosedin
amoisture-andmold-resistantglassmatonbothsides
–Canbeleftexposedforupto12months
–UL/ULCclassifiedastofireresistance
–Panelsare1"thickand24"widewithbevelededges
–RefertoproductsubmittalsheetWB2483formoreinformation
GypsumPanels Sheetrock®BrandFirecode®CoreGypsumPanelsandCementBoard –Alloftheadvantagesofregularpanelswithadditionalresistancetofire
–Availablein5/8"thickness,4'width
–RefertoproductsubmittalsheetWB1473formoreinformation
Sheetrock®BrandFirecode®CCoreGypsumPanels
–ProvideimprovedfireresistanceoverstandardFirecodepanelsbecauseofadditivesthatenhanceintegrityofthecore
underfireexposure
–Availablein5/8"and1/2"thicknesses,4'width
–RefertoproductsubmittalsheetWB1473formoreinformation
8 USGShaftWallSystems
Components
Sheetrock®BrandMold tough™Firecode®CoreGypsumPanels
–Panelshaveanoncombustible,moisture-andmold-resistantgypsumcoreencasedinamoisture-andmold-resistant,
100%recycledgreenfaceandbrownbackpapers
–Taperedlongedgesforeasyfinishing
–Availablein5/8"thickness,4'width
–5/8"panelsareULClassifiedforfireresistance
–RefertoproductsubmittalsheetWB2390formoreinformation
Sheetrock®Brandultracode®CoreGypsumPanels
–3/4"-thickpanelsrequirefewerlayersofgypsumpanelsinapproveddesignswhenusedwithsteelstudsandmineral
woolinsulation
–Availablein4'width
–RefertoproductsubmittalsheetWB2167formoreinformation
Sheetrock®BrandMold tough™ultracode®CoreGypsumPanels
–3/4"panelshaveanoncombustiblemoisture-andmold-resistantgypsumcoreencasedinmoisture-andmold-
resistantgreenfaceandbrownbackpapers
–ULClassifiedastofireresistance,surface-burningcharacteristicsandnoncombustibility
–RefertoproductsubmittalsheetWB2388formoreinformation
durock®CementBoard
–Water-durable,mold-resistantsubstrateforhigh-moistureareas
–RefertoproductsubmittalsheetCB399formoreinformation
Fiberock®Abuse-ResistantInteriorPanels
–Resistdenting,breakingandpuncturing,eveninhigh-trafficareas
–Excellentfireresistance
–Madefrom95%recycledmaterials
–RefertoproductsubmittalsheetF102formoreinformation
Fiberock®aqua-tough™InteriorPanels
–Usedonlyforwalldesigns
–Increasedresistancetoabrasion,indentationandpenetration
–Madefrom95%recycledmaterials
–RefertoproductsubmittalsheetF134formoreinformation
iMperial®Firecode®CoreandFirecode®CCoreGypsumBase
–Largesize,rigidbaseforfire-ratedgypsumveneerplastersystems
–Designedfordirectorresilientattachmenttowoodorsteelframing
–Multilayeredlaminatedfacepapertocontrolwaterabsorptionandresistsag
–RefertoproductsubmittalsheetP790formoreinformation
9 USGShaftWallSystems
SteelFraming USGSteelJ-Runner(JR) USGSteelC-HStud(CH)
USGSteelJamb-Strut(JS) USGSteelE-Stud(ES)
Thickness–SteelFramingaComponents DesignThicknessb MinimumThickness Style in. mils in. mils ga. CH,ES 0.0188 18 0.0179 18 25
JR 0.0239 22 0.0227 23 24
CH,ES,JR,JS 0.0359 33 0.0341 34 20
StructuralProperties–SteelFramingComponents Component Product AverageWeight Area Ix Sx
c AllowanceDesign andSize Identification (lb./lin.ft.) (sq.in.) (in.4) (cu.in.) Stress(ksi) 2-1/2"C-HStud 212CH-18 0.5186 0.1524 0.129 0.093 19.8
212CH-34 0.998 0.2910 0.239 0.1741 24.0
4"C-HStud 400CH-18 0.6118 0.1798 0.383 0.162 19.8
400CH-34 1.243 0.3433 0.730 0.318 24.0
6"C-HStud 600CH-34 1.366 0.4227 1.998 0.569 24.0
Double6"E-Stud 600ES-18 1.546 0.3982 2.004 0.628 20.00
600ES-34 2.372 0.6364 3.400 1.094 20.00
2-1/2"J-Runner 212JR-23 0.448 0.1346 0.117 0.085 3.00
212JR-34 0.670 0.2039 0.192 0.130 4.96
4"J-Runner 400JR-23 0.573 0.1705 0.351 0.163 3.00
400JR-34 0.857 0.2577 0.574 0.251 4.96
6"J-Runner 600JR-23 0.740 0.2183 0.937 0.295 3.00
600JR-34 1.107 0.3295 1.523 0.457 4.96
2-1/2"JambStrut 212JS-34 0.818 0.2398 0.226 0.143 3.00
4"JambStrut 400JS-34 1.006 0.2936 0.647 0.270 3.00
6"JambStrut 600JS-34 1.256 0.3654 1.673 0.485 3.00
Note(a)StudsandrunnerscomplywithASTMC645.(b)PropertiesofsteelframingmembershavebeencalculatedinconformancewithANSISpecificationfortheDesignofCold-FormedSteelStructuralMembers,1996edition.(c)Fullsectionmodulustobeusedwithcorrespondingdesignstress.
21/2", 4", 6"
1"
2"
3/4"1"
1"21/2"
3/4"1"
4", 6"
1"
3/8"
1"
21/2", 4", 6" 3"
1"
7/32"
13/8"
21/2", 4", 6"11/2"
10 USGShaftWallSystems
Components
InteriorFinishingProducts Sheetrock®BrandAcousticalSealant
–SuperiorperformanceasafirecaulkinUL-classifiedjointsystems
–Minimizeswhistlinganddirtaccumulationduetoairmovementwhenappliedtopartitionperimeterandpenetrations
–RefertoproductsubmittalsheetJ678formoreinformation
Sheetrock®BrandFirstCoat
–Aflatlatexpaintformulatedtoprovideasuperiorfirst(prime)coatoverinteriorgypsumboardandconcretesurfaces
–Equalizesporosityandsurfacetexturedifferencestoprovidegreateruniformityoffinishcoat
–RefertoproductsubmittalsheetJ1095formoreinformation
Sheetrock®BrandAllPurposeJointCompound
–Versatileperformer:tape,finish,texture,laminateorskimcoat
–Combinessingle-package,ready-mixedconveniencewithgoodtapingandtoppingperformance
–RefertoproductsubmittalsheetJ60Aformoreinformation
Sheetrock®BrandpluS 3™LightweightAllPurposeJointCompound
–Weighsupto30%lessthanconventionalcompoundsandsandswiththeeaseofatoppingcompound
–Withverylowshrinkage,itrequiresonlytwocoatsovermetal,suchascornerbeadsandfasteners
–RefertoproductsubmittalsheetJ498Aformoreinformation
Sheetrock®BrandtuFF-hide™Primer-Surfacer
–Ahighsolids,vinyl,acryliclatex-basedcoatingforinteriorsprayapplicationovernewdrywall
–Singlesprayapplicationprovidesthesameresultsachievedusingatypicaltwo-stepprocessofskimcoatingsurfaces
withjointcompoundfollowedbyacoatofprimer
–Savestimeandmoney
–RefertoproductsubmittalsheetJ1691formoreinformation
Sheetrock®BrandPaperFacedMetalBeadandTrim
–Cost-effective,problem-free,beautifulcorners
–Superiorsolutiontoedgecrackingandchipping
–RefertoproductcatalogJ1424formoreinformation
11 USGShaftWallSystems
Performance Testing
USG shaft wall systems provide superior safety and performance for an important building component.
PerformanceTests uSgshaftwallsystemsresultfromaprogramofextensivetestingandcontinuousimprovementstohelpyouachievethe
superiorperformancethatyourprojectdemands.Systemsprovideuptofour-hourfireresistanceandsoundratingsup
to52STC,andresistbothsustainedandintermittentlateralloadsandfatigueundercycliclateralloading.
TestingMethods AllUSGproductsandsystemsundergoexhaustivetestingtoensurethattheymeetexactingstandards.USGproducts
areclassifiedastofireresistanceandfire-hazardproperties.Aspartofthisprotocol,UnderwritersLaboratories(UL)
periodicallyauditsproductionofthesematerialstoensurecompliancewithnecessaryproperties.ULisanindependent,
not-for-profitorganizationthathastestedproductsforpublicsafetyforoveracentury.
Productsaremanufacturedandtestedinaccordancewithrecognizedstandards.ASTMInternationalisoneofthe
largestvoluntarystandardsdevelopmentorganizationsintheworld,andisatrustedsourcefortechnicalstandardsfor
materials,products,systemsandservices.
ThesesystemshavebeendesignedandtestedusingacceptedengineeringpracticeswithdeflectionlimitsofL/120,
L/240andL/360.Additionally,limitingheighttableslistedhereinaccountforflexuralandshearstresses.Awiderange
ofproductandsystemcombinationsisavailabletomeetperformancerequirements:intermittentandsustainedair
pressureloadingof5,7-1/2,10and15psf.
TestingResults FireProtection
Intheeventofafire,mechanicalshaftsandstairsarevitalchannelsforcommunication,power,water,air,exhaust
andegress—makingtheshaftsthelifelinesofthebuilding.Sinceitiscriticallyimportantthatthesewallsprotect
occupantsandnecessaryservicesfromfire,uSgshaftwallsystemshavebeentestedforfireendurance.
TheprimaryattributeofuSgshaftwallsystemsanditscomponentsisfireresistance.Testingsupportingthis
attributeensuresthatthiscriticalperformancecomponentwillnotbecompromisedwhenproperlyinstalled.
Thisfiretestingresultsinthefollowing:
–ULClassificationofallgypsumpanelcomponents
–ULfire-resistanceClassificationsforonetofourhours
–ULsystemtestingwithallmajorelevatordoormanufacturers
–ULlistingforfiredamperinstallation
–Firetestdataforelectricalpanels,call-buttonboxesandotherinterfaces
–ULlistingofshaftwallheadofwall
SeetheGoodDesignPracticessectionformoreinformationonfireresistance.
SoundControl
SoundcontroltestdatademonstratetheeffectivenessofuSgshaftwallsystemsinattenuatingsound.When
properlydesignedandinstalled,uSgshaftwallsystemswillincreasecomfortlevelsbyreducingunwantednoise
fromadjacentspaces.
Thestandardassemblyoffers39STCrating;47STCisachievedbyadding1"soundinsulationwithinthepartition
cavity,and52STCwithsingle-layer3/4"ultracodepanelsand3"soundinsulation.
12 USGShaftWallSystems
Performance Testing
TestingResults Impact-ResistantforDurability Performance Impactedwitha60-lb.sandbag,uSgshaftwallsystemsproveddurable.Inthetest,threeimpactseachweremadeat
15ft.-lb.,30ft.-lb.,andeachfollowing15ft.-lb.intervaluntilfailure.At270ft.-lb.thetestwasstopped;whilecracked,
thewallwasnotpenetrated.Foradditionalinformationaboutabuse-resistant,secureorotherhardenedapplications,
contactUSGat800USG.4YOU.
Moisture/Mold
Thebestwaytominimizedamagefrommoistureandmoldistominimizeoreliminateexposuretowaterbefore,during
andafterconstruction.Inallcaseswheremoistureintrusionoccurs,eliminateallsourcesofmoistureimmediately.
Sheetrockgypsumlinerpanels,SheetrockMold toughgypsumlinerpanelsandSheetrockglass-matgypsumliner
panelshavewater-resistantfacings.Inaddition,SheetrockMold toughand Sheetrockglass-matgypsumlinerpanels
havemoisture-andmold-resistantpaperandawater-resistantcore.
Whenusedinconjunctionwithgoodconstructionpractices,theseproductswillminimize,butnoteliminate,therisk
ofmoistureandmolddamage.Formoreinformationonmoisturecontrolandmold,seeWB2317,Moisture, Mold, and
Construction Practices, andSA934,Moisture-Resistant Assemblies.ThefollowingWebsitesareanotherresource:
NewYorkCityDepartmentofHealth UnitedStatesEnvironmentalProtectionAgency ci.nyc.ny.us/html/doh epa.gov
Searchformoldresources. Searchformoldresources.
ResponsibleSolutionstoMoldCoalitionresponsiblemoldsolutions.org
Searchformoldresources.
13 USGShaftWallSystems
AlternativeMaterialsand Thefollowingnotesofferalternativemethodsofconstruction.SpecialRequirements 1. Whereinsulationisshowninassemblydrawings,thespecifictypeofproductisrequiredintheassemblytoachieve
thestatedfire-resistancerating.Otherwise,mineralwoolorglassfiberinsulationmaybeincorporatedintoanyassembly
withoutcompromisingthefire-resistantrating.
2. Studdepthsareminimumrequiredforfire-resistancerating.
3. WhereRC-1resilientchannelisindicated,RC-1orequivalentmaybeused.RC-2isnotanequivalentsubstitution.
4. UseL/360deflectioncriteriaforlimitingheight/studselectionand20ga.minimumframingwhenapplyingdurock
cementboard.RefertoSA934,Moisture-Resistant Assemblies,formoreinformationonapplicationand
relatedproducts.
5. 5/8"iMperialFirecodeCoregypsumbase,5/8"SheetrockMoldTough FirecodeCoregypsumpanelsor5/8"Fiberock
aqua-toughinteriorpanelsmaybesubstitutedfor5/8"SheetrockFirecodeCoregypsumpanels.
6. 1/2"Sheetrock Mold tough FirecodeCCoreor1/2"iMperialFirecodeCCoregypsumbasemaybesubstituted
for1/2"SheetrockFirecodeCCoregypsumpanels.
7. 5/8"SheetrockFirecodeCoregypsumpanels,5/8"iMperialFirecodeCoregypsumbaseor5/8"Fiberockpanelscanbe
substitutedfor1/2"SheetrockFirecodeCCoregypsumpanels.
8. Use20ga.minimumframingwithFiberockpanels.
9. 1"SheetrockMold toughgypsumlinerpanels,orSheetrockglass-matgypsumlinerpanelsmaybesubstitutedfor
1"Sheetrockgypsumlinerpanelsinallsystemswithoutcompromisingthefirerating.
10. FormoreinformationaboutperformanceratedshaftwallsystemsandforcompletelistofUSG'sfire-rateddesigns,
visitUSGDesignStudioatUSGDesignStudio.com.
11. FordetailedinformationregardingULClassifieddesignsshowninthePerformanceSelector,pleaserefertotheUL
Fire-ResistanceDirectory—VolumeOneorvisitUL.com.
Performance Selector
1-HourFire-ratedConstruction Non-loadbearing AcousticalPerformance Reference
ConstructionDetail Description TestNumber STC TestNumber ARL Index
wt.8 •5/8"SheetrockFirecodeCoregypsumpanels, ULDesU415, SA926 1
31⁄8"
jointsfinished SystemA •2-1/2"USGC-HStuds25gauge24"o.c. orU469 •1"Sheetrockgypsumlinerpanels
2-HourFire-ratedConstruction
wt.9 •1/2"SheetrockFirecodeCCoregypsumpanels, ULDesU415, SA926 2
31⁄2"
facelayerjointsfinished SystemB •2-1/2"USGC-HStuds25gauge24"o.c. orU438 •1"Sheetrockgypsumlinerpanels
wt.8 •3/4"SheetrockultracodeCoregypsumpanels, ULDesU415, SA926 3
43⁄4"
jointsfinished SystemC •4"USGC-Hstuds25gauge24"o.c. •3"therMaFiberSAFB •1"Sheetrockgypsumlinerpanels
wt.10 •1/2"durockcementboard,jointsfinished ULDesU415, SA926 4
35⁄8" •5/8"SheetrockFirecodeCoregypsumpanels SystemD
•2-1/2"USGC-Hstuds20gauge24"o.c. •1-1/2"therMaFiberSAFB •1"Sheetrockgypsumlinerpanels •durockcementboard,screwattachedand laminatedtogypsumpanelwith4verticalstrip ceramictilemasticcenteredbetweenstuds
wt.9 •1/2"SheetrockFirecodeCCoregypsumpanels ULDesU415, SA926 5
31⁄2"
•2-1/2"USGC-HStuds25gauge24"o.c. SystemE •1"Sheetrockgypsumlinerpanels orU467 –jointsfinishedbothsides
wt.10 •1/2"SheetrockFirecodeCCoregypsumpanels ULDesU415, SA926 6
4"
appliedvertically,facelayerjointsfinished SystemF •RC-1resilientchannelorequivalent24"o.c. •2-1/2"USGC-HStuds25gauge24"o.c. •1"Sheetrockgypsumlinerpanels
wt.8 •1"x2"perimeterangles25gauge ULDesU529 SA926 7
2" •1"Sheetrockgypsumlinerpanel,fastenedto
angles •1/2"SheetrockFirecodeCCoregypsumpanels •1/2"SheetrockFirecodeCCoregypsumpanels, jointsfinished
14 USGShaftWallSystems
39 USG-040901 Basedon4"C-Hstuds25gauge
38 USG-040917
43 USG-040912 Basedon4"C-Hstuds25gauge
48 RAL-OT-04-022 Basedon1"soundbattsincavity
50 RAL-OT-04-019 Basedon4"C-Hstuds25gaugewith
3"mineralfiberinsulation
51 RAL-OT-04-020 Basedon4"C-Hstudswith3"therMaFiber
SAFBinsulation
44 USG-040911 Basedon4"C-Hstuds25gauge
53 USG-040909 Basedon4"C-Hstuds25gaugewith 3"mineralfiberinsulation
58 USG-040910 Basedon4"C-Hstuds25gaugewith
additionallayeronlinerpanelsideand3"mineralfiberinsulation
2"
Alldetails,specifications,anddatacontainedinthisliteratureareintendedasageneralguide.Theseproductsmustnotbeusedinadesignorconstructionofanygivenstructurewithoutcompleteanddetailedevaluationbyaqualifiedstructuralengineerorarchitecttoverifysuitabilityofaparticularproductforuseinthestructure.
15 USGShaftWallSystems
2-HourFire-ratedConstruction Non-loadbearing AcousticalPerformance Reference
ConstructionDetail Description TestNumber STC TestNumber ARL Index
Note:Studsizeandgaugeshownareminimums.Possiblepanelssubstitutions.
NoteStudsizeandgaugeshownareminimums.PossiblepanelalternativesshownoncrossreferenceofUSGPanelsandUlFireRatingsonpage7ofSA100,Fire-Resistant Assemblies.
•5/8"SheetrockFirecodeCoregypsumpanels, ULDesU437 SA926 8
51⁄4"
facelayerjointsfinished •4"USGC-Hstuds20gauge24"o.c.run horizontallyandattachedtoverticalUSG J-runners,20gauge •1"Sheetrockgypsumlinerpanels
3-HourFire-ratedConstruction
wt.13 •5/8"SheetrockFirecodeCCoregypsumpanels, ULDesU415, SA926 9
43⁄8"
facelayerjointsfinished SystemG •2-1/2"USGC-Hstuds25gauge24"o.c. •1"Sheetrockgypsumlinerpanels
wt.13 •5/8"SheetrockFirecodeCCoregypsumpanels, ULDesU415, SA926 10
43⁄8"
facelayerjointsfinished SystemH •2-1/2"USGC-Hstuds25gauge24"o.c. •1"Sheetrockgypsumlinerpanels •5/8"SheetrockFirecodeCCoregypsumpanels, jointsfinished
4-HourFire-ratedConstruction
wt.18 •3/4"SheetrockultracodeCoregypsumpanels, ULDesU415, SA926 11
63⁄8"
onfurringchannel24"o.c.,over2layers SystemI 3/4"SheetrockultracodeCoregypsumpanels, facelayerjointsfinished •2-1/2"USGC-Hstuds25gauge24"o.c. •1"Sheetrockgypsumlinerpanels •baselayeroverfurringchannelappliedvertically
49 USG-040902 Basedon4"C-HStuds
16 USGShaftWallSystems
Performance Selector
Wall Systems — Limiting Heights
USG shaft wall systems are engineered to withstand pressure loads and provide in-service impact resistance to ensure long-term performance and durability. Use this section to determine the size and gauge of framing for the system you select. You will need to know elevator pressures and other in-service demands.
Structural FlexingResistanceforIn-ServicePerformancePerformance Shaftwallsaresubjectedtobothpositiveandnegativepressuresaselevatorcabsriseanddescend.Thispistoneffect
ofanelevatorinitsshaftcausescontinualflexingoftheshaftwall.Intests,uSgshaftwallsystemsweresubjectedto
over1millionfulloscillationcyclestomodelwallperformancethroughthelifeofthebuilding.Thesetestsshowed
thata25ga.J-runnerisinadequateatthetoporbottomofashaftwall.Asthelongrunnerlegiscontinuallyflexed
fromwalldeflection,itcanruptureandscrewscanstripoutandfracturefromtheflexing.Oscillationtestsshowed
24ga.J-runnersminimizetheseproblemsandareessentialtolong-termsafety.
LimitingHeights Maximumpartitionheightsareshownforfourdifferentintermittentairpressureloadsandthreeallowabledeflections.
Theappliedpressureloadisselectedbythedesignerbasedonelevatorcabspeedandthenumberofelevatorsper
shaft.Insteadofusingonlydeflectioncriteria,USGdesigndataconsiderseveraladditionalfactorsindetermining
limitingpartitionheights.
A. Bendingstress—theunitforceexertedthatwillbreakordistortthestud.
B. Endreactionshear—determinedbytheamountofforceappliedtothestud,whichwillbendorsheartheJ-runner
orcripplethestud.
C. Deflection—theactualdeflectionunderaload.Allowabledeflectionisbasedontheamountofbendingunderload
thataparticularwallcanexperiencewithoutexceedingaprescribedratiorelatedtopartitionheight.
ElevatorShaft Theairpressureloadonshaftwallsdependsupontheelevatorcabspeedandthenumberofelevatorspershaft.Pressures ThefollowingrecommendationsarederivedfromUSGtestsconductedinthreehigh-risebuildingsranginginheight
from17to100stories.
RecommendedElevatorShaftPressureLoad Elevatorvelocityft./min. Oneortwoelevatorspershaft Threeormoreelevatorspershaft 0to180 5.0psf 5.0psf
180to700 7.5psf 5.0psf
700to1,600 10.0psf 7.5psf
1,600to2,000 15.0psfa 7.5psf
Note(a)Single-cabhigh-speedelevatorshaftsmayrequirespecialdesignconsiderations.
17 USGShaftWallSystems
Wall Systems — Limiting Heights Table
IntermittentAirPressure Fire-ratedsystemB,D,F,G,H,I Fire-ratedsystemEb
Load(windload)–psf a StudType Designation Allowable 5 7.5 10 15 5 7.5 10 15
andSize deflection
2-1/2"C-HStuds 212CH-18 L/120 12'4" 10'10" 9'10" 8'7" 12'2" 10'8" 9'8" 8'5"
L/240 11'4" 9'11" 8'12" 7'10" 11'2" 9'9" 8'10" 7'9"
L/360 10'4" 9'1" 8'3" 7'2" 9'10" 8'7" 7'10" 6'10"
212CH-34 L/120 14'3" 12'5" 11'4" 9'11" 14'2" 12'5" 11'3" 9'10"
L/240 12'10" 11'3" 10'2" 8'11" 13'0" 11'5" 10'4" 9'1"
L/360 11'7" 10'1" 9'2" 8'0" 11'6" 10'0" 9'1" 7'12"
4"C-HStuds 400CH-18 L/120 17'9" 14'6" 12'7" 10'3" 16'4" 14'3" 12'11" 10'7"
L/240 15'7" 13'8" 12'5" 10'3" 15'2" 13'3" 12'0" 10'6"
L/360 13'11" 12'2" 11'1" 9'8" 13'4" 11'8" 10'7" 9'3"
400CH-34 L/120 19'11" 17'4" 15'9" 13'10" 19'6" 17'1" 15'6" 13'7"
L/240 18'1" 15'9" 14'4" 12'6" 17'11" 15'8" 14'3" 12'5"
L/360 16'2" 14'1" 12'10" 11'3" 15'10" 13'10" 12'7" 11'0"
6"C-HStuds 600CH-34 L/120 25'4" 22'2" 19'8" 16'1" 28'0" 25'1" 21'9" 17'9"
L/240 21'9" 19'0" 17'4" 15'1" 24'10" 21'9" 19'9" 17'3"
L/360 20'0" 17'6" 15'11" 13'11" 21'11" 19'2" 17'5" 15'2"
Fire-ratedsystemCc Fire-ratedsystemAc
Studtype Designation Allowable 5 7.5 10 15 5 7.5 10 15 andSize deflection
2-1/2"C-HStuds 212CH-18 L/120 — — — — 11'5" 10'0" 9'1" 7'11"
L/240 — — — — 10'7" 9'3" 8'4" 7'4"
L/360 — — — — 9'4" 8'2" 7'5" 6'6"
212CH-34 L/120 — — — — 13'5" 11'8" 10'8" 9'3"
L/240 — — — — 12'3" 10'9" 9'9" 8'6"
L/360 — — — — 10'10" 9'6" 8'7" 7'6"
4"C-HStuds 400CH-18 L/120 15'2" 12'5" 10'9" 8'9" 15'2" 12'5" 10'9" 8'9"
L/240 14'5" 12'5" 10'9" 8'9" 14'5" 12'5" 10'9" 8'9"
L/360 12'9" 11'2" 10'1" 8'9" 12'9" 11'2" 10'1" 8'9"
400CH-34 L/120 20'5" 17'10" 16'2" 13'4" 20'5" 17'10" 16'2" 13'4"
L/240 17'6" 15'3" 13'10" 12'1" 17'6" 15'3" 13'10" 12'1"
L/360 15'3" 13'4" 12'1" 10'7" 15'3" 13'4" 12'1" 10'7"
6"C-HStuds 600CH-34 L/120 26'3" 21'5" 18'7" 15'2" 26'3" 21'5" 18'7" 15'2"
L/240 24'0" 20'12" 18'7" 15'2" 24'0" 20'12" 18'7" 15'2"
L/360 21'1" 18'5" 16'9" 14'8" 21'1" 18'5" 16'9" 14'8"
FormoreinformationconsultProgressiveEngineeringReportAER-09038atp-e-i.com
NotesRunnerfastenersshouldwithstand193-lb.singleshearand200-lb.bearingforce;attachmentspacingshouldnotexceed24"o.c.SeethePerformanceSelectorforsystemreferencesandratedassemblydetails.L/180dataavailableuponrequestfromUSG.Limitingcriteria:f–bendingstress,d–deflection,v–endreactionshear,c–practicallimitation.(a)Studspacingof24"forallvalues.(b)Forassemblywithsingle-layerboardbothsidesofstuds.(c)Forassemblywithsingle-layerboardattachedtostuds.(d)AttachmentofUSGsteeldouble6"E-studforuSgshaftwallsystems.Thestudsaretobeattachedback-to-back(webtoweb)withpairs1/2"oftypeS-12panheadscrewsinstalledintworows,spacedaswidelyapartaspossible.Thefirstandlastpairsoffastenersshallstartwithin6"ofeachendofthestuds.Theyshallthenbespacedatamaximumof12"oncenterthroughoutthebodyoftheentirestud.(e)UseJR20runnerforthisheight.
18 USGShaftWallSystems
Performance Selector
Wall Systems — Limiting Heights
UnlinedShafts Gypsumshaftwallshavebeenusedformanyyearsforventandairshafts.Theirfire-resistantfeaturesandeconomical
dryconstructionmakethemidealforthisuse.Tofunctionproperly,ventandairshaftsystemsshouldbedesignedwith
thefollowingperformanceprovisions:
1. Gypsumboardsurfacetemperaturedoesnotexceed125°F.
2. Separateapprovedlinersshouldbeinstalledinareassubjecttocontinuousmoistureoverspray,condensationorair
streamtemperatureover125°F.
3. Airstreamdewpointtemperaturesaremaintainedbelowgypsumboardsurfacetemperature.
4. Theassemblyisconstructedtowithstandsustaineddesignuniformairpressureloadsnotexceeding10psf.Startup
surgeloadsshouldnotbegreaterthan1-1/2timesthedesignstaticload.(Seetablebelowforlimitingheights.)
5. Toensureairtightconstruction,selectappropriatesealantsandapplywhererequired.
Sustainedpressureload–psf 2-hr.fire-ratedsystem 1-hr.fire-ratedsystem
StudType Designation Stud Allowable 5 10 5 10andSize Spacing deflection
2-1/2"C-HStuds 212CH-18 24" L/120 10'10" 8'7" 10'0" 7'11"
L/240 9'11" 7'10" 9'3" 7'4"
L/360 9'1" 7'2" 8'2" 6'6"
212CH-34 24" L/120 12'5" 9'11" 11'8" 9'3"
L/240 11'3" 8'11" 10'9" 8'6"
L/360 10'1" 8'0" 9'6" 7'6"
4"C-HStuds 400CH-18 24" L/120 14'6" 10'3" 12'5" 8'9"
L/240 13'8" 10'3" 12'5" 8'9"
L/360 12'2" 9'8" 11'2" 8'9"
400CH-34 24" L/120 17'4" 13'10" 17'10" 13'4"
L/240 15'9" 12'6" 15'3" 12'1"
L/360 14'1" 11'3" 13'4" 10'7"
6"C-HStuds 600CH-34 24" L/120 22'2" 16'1" 21'5" 15'2"
L/240 19'0" 15'1" 20'12" 15'2"
L/360 17'6" 13'11" 18'5" 14'8"
FormoreinformationconsultProgressiveEngineeringReportAER-09038atp-e-i.com
NotesRunnerfastenersshouldwithstand193-lb.singleshearand200-lb.bearingforce;attachmentspacingshouldnotexceed24"o.c.(a)UseJR20runnerforthisheight.
19 USGShaftWallSystems
Wall Systems — Solid Shaft Wall
USG shaft wall systems can be used as a vent enclosure for vertical shafts with a two-hour fire rating per UL Design U529. This shaft assembly is particularly suited for structures having a number of relatively small and separated mechanical, service and ventilator shafts.
VentShaftElevation
WallIntersection Corner
NoteLimitingheightofsystemis12.0".Installpanelsverticalandfullheightonly.
Vent shaft elevation
SHEETROCK setting type joint compound lamination
1/2" SHEETROCK FIRECODE C core gypsum panel – 11/2" type G screws 24" o.c.
1/2" SHEETROCK
FIRECODE C Core gypsum panel – 11/2" type G screws 24" o.c.
1" SHEETROCK gypsumliner panel –15/8" type S screws 12" o.c. to angle
angle runner
3'
2' 2'
4'
1' 4' 2'
25 ga. 1" x 2" angle
SHEETROCK gypsum panels
1" SHEETROCK gypsum liner panel
24 ga. 2" x 2" angle
SHEETROCK gypsum panels
1" SHEETROCK gypsum liner panel
20 USGShaftWallSystems
Performance Selector
Ceiling System — Limiting Spans
HorizontalAssemblies uSgshaftwallsystemsinstalledhorizontallyprovideeconomicalconstructionforfire-resistiveductenclosures,
corridorceilingsandstairwaysoffits.
TripleLayer
With1"linerpanelsinsertedinUSGC-Hstuds24"o.c.andtriple-layer1/2"SheetrockFirecodeCCoregypsumpanels
screw-attachedtostuds,thesystemprovidestwo-hourprotectionfromfire.
DoubleLayer
Withdouble-layer1/2"SheetrockFirecodeCCoregypsumpanelsscrew-attachedtostuds,theassemblyprovides
two-hourfire-resistiveceilingconstructionforcorridorsandstairsoffits(seeDesignDetails).
SingleLayer
Withsingle-layer5/8"SheetrockFirecodeCCoregypsumpanelsscrew-attachedtostuds,theassemblyprovides
one-hourfire-resistiveceilingconstructionforcorridorsandstairsoffits.
Limitations
1. USGC-Hstudsarenotdesignedtocarryliveloadsormechanicalequipmentorprovidematerialstoragearea.
2. Maximumstudspacingis24"o.c.;maximumspansareshownintablebelow.
LimitingSpans— HorizontalShaftWallsa
FormoreinformationconsultProgressiveEngineeringReportAER-09038atp-e-i.com
Note(a)BasedonL/240allowabledeflectionwithstudsat24"o.c.andJR24runner.(b)FullsteelstressallowedbasedonASTME119.(c)Allowablesteelstressreduced50%.
2-Hr.HorizontalMembraneorMetalDuctEnclosure
Triple-layer1/2"gypsumpanelsb MaximumSpan212CH-18 6'5"
212CH-34 8'3"
400CH-18 8'6"
400CH-34 12'0"
600CH-34 12'8"
2-Hr.CorridorCeilingsandStairSoffits
Double-layer1/2"gypsumpanelsc MaximumSpan212CH-18 6'0"
212CH-34 9'2"
400CH-18 7'10"
400CH-34 13'2"
600CH-34 15'10"
1-Hr.Single-layer5/8"gypsumpanelsc MaximumSpan212CH-18 6'7"
212CH-34 10'3"
400CH-18 8'8"
400CH-34 14'6"
600CH-34 17'5"
Ceiling Membrane
2-Hr.RatedAssembly–HorizontalMembraneorMetalDuctEnclosure
FormoreinformationconsultProgressiveEngineeringReportAER-09038atp-e-i.com
1-Hr.FireRatedAssembly(seeNER-258orAER-09038)–CorridorCeilingandStairSoffit 2-Hr.FireRatedAssembly(seeNER-258orAER-09038)–CorridorCeilingandStairSoffit
SHEETROCK acoustical sealant
SHEETROCK acoustical sealant
duct surface
Rotated Section
1" SHEETROCK gypsum liner panel
Metal Duct Enclosure - 2-Hr. Rated Assembly
USG steel C-H studUSG steel J-runner
fastener 24" o.c. max. (shear and withdrawal resistance as required by specific design conditions)
fastener 24" o.c. max. (shear and withdrawal resistance as required by specific design conditions)
SHEETROCK gypsum panels
1/2" type S pan head screw at 12" o.c. (attach both sides of C-H stud and J-runner at top and bottom of stud)
max. height 4'-0"
max. span 8'-11" with 25 ga. studs
max. span 11'-8" with 20 ga. studs
21 USGShaftWallSystems
Design Details
USG steel J-runner
fasteners as required 24" o.c.
SHEETROCK gypsum panels
1" SHEETROCK gypsum liner panel
SHEETROCK acoustical sealant
USG steel C-H studUSG steel J-runner
fasteners as required 24" o.c.
SHEETROCK gypsum panel
1" SHEETROCK gypsum liner panel
SHEETROCK acoustical sealant
USG steel C-H stud
22 USGShaftWallSystems
Design Details
Basic Interfaces — System B
HeadSection(ULSystemHW-D-0603) BaseSection(ULSystemBW-S-0016)
Call-ButtonBox
USG steel C-H stud
SHEETROCK acoustical sealant
USG steel J-runner
SHEETROCK FIRECODE CORE
gypsum panels
5/8" max .1" min .
3/8" to 1/2"
SHEETROCK gypsumliner panels
SHEETROCK acoustical sealant as required for sound
1" SHEETROCK gypsum liner panels
gypsum panel cant screw–attached to vertical studs(for projections over 4")
USG steel J-runner
over4"
75˚min.
USG steel C-H stud
SHEETROCK FIRECODE Core gypsum panels
4" min
SHEETROCK FIRECODE Coregypsum panels
call-button box
25 ga. steel strip(6"x12" min.)
1" SHEETROCK gypsum liner panels
USG steel J-runner
USG cornerreinforcement
USG steel C-H stud
SHEETROCK FIRECODE
CORE gypsum panels
1” SHEETROCK gypsumliner panels
1” SHEETROCK gypsum liner panels
1” SHEETROCK gypsumliner panels
USG steel J-runner
fasteners as required 24" o.c.
SHEETROCK gypsum panels
1" SHEETROCK gypsum liner panel
sealant
USG steel J-runner
USG corner reinforcement
SHEETROCK gypsum panels
1" SHEETROCK or SHEETROCK
MOLD TOUGH
gypsum liner panel
SHEETROCK acoustical sealant
USG steel J-runner
USG steel C-H stud
1” SHEETROCK gypsum liner panels
1” SHEETROCK gypsum liner panels
23 USGShaftWallSystems
WallJunction OutsideCorner
WallIntersection InsideCorner
24 USGShaftWallSystems
Design Details
Basic Interfaces — System B
Outlet/SwitchBox ControlJoint
StairHangerandRodApplication Cross-SectionatStairHanger
USG steel J-runner
mineral wool insulation
1/2" joint width
SHEETROCK gypsum panels
* up to 2-hour fire rating
control joint
1" SHEETROCK
gypsum liner panels
SHEETROCK acoustical sealant
SHEETROCK gypsum panels
outlet box
Note: the surface area of individual outlet or switch boxes shall not exceed 16 square inches. The aggregate surface area of all boxes shall not exceed 100 square inches.(per U.L. fire resistance directory)
1" SHEETROCK gypsum liner panels
1" SHEETROCK gypsum liner panel
hanger rod
steel angle
stair landing
stair stringer
stairwell side
SHEETROCK gypsum panels
USG steel C-H stud 24" o.c.
hanger rod
1" SHEETROCK gypsum liner panel
SHEETROCK gypsum panel
NoteThesurfaceareaofindividualoutletorswitchboxesshallnotexceed16squareinches.Theaggregatesurfaceareaofallboxesshallnotexceed100squareinches.(perULfireresistancedirectory)
Z-clip attached to beambefore fireproofing
Z-clip max. spacing24" o.c. min. 20 ga. min.2 fasteners per leg
USG steel J-runner USG steel C-H stud
fasteners
Steel beam with fireproofing
SHEETROCK
FIRECODE CORE
gypsum panels
SHEETROCK acoustical sealant
1” SHEETROCK gypsumliner panels
USG steel J-runner attached to beambefore fireproofing
continuous 14 ga .steel plate
8" max .11/2" min .
SHEETROCK acoustical sealant
fasteners
Steel beam with fireproofing
1” SHEETROCK gypsum liner panels
SHEETROCK FIRECODE CORE
gypsum panels
steel plate (20 ga. min.)fastened to studs parallelto stringers as required
SHEETROCK gypsum panel
1" SHEETROCK
gypsum liner panel
USG steel J-runnerattached to beambefore fireproofing
power
Steel beam with fireproofing
-actuatedfastener 24" o.c .
SHEETROCK acoustical sealant
1” SHEETROCK gypsumliner panels
SHEETROCK FIRECODE Coregypsum panels
25 USGShaftWallSystems
HandrailApplication SteelBeam(ULSystemHW-D-0610)
SteelBeamwithZ-Clip(ULSystemHW-D-0609) SteelBeamwithOffset(ULSystemHW-D-0611)
26 USGShaftWallSystems
Design Details
Fire Damper
TypicalPenetrationsElevationatDuctOpeningTestedperULR13479
SectionA SectionB 1-1/2Hr.FireDamperTestedperULR13479 1-1/2Hr.FireDamperTestedperULR13479
1/2" x 1/2" x 16 gaugegalvanized angle
damper sleeve
1/2" max.
SHEETROCK FIRECODE Coregypsum panels
1" SHEETROCK gypsum liner panel
USG steel J-runnerheader
26 USG Shaft Wall Systems
1/2" x 1/2" x 16 gaugegalvanized angle
damper sleeve
1/2" max.
USG steel J-runner
USG steel J-runner
USG steel J-runner
duct opening
B
A
USG steel E-studs or J-runnersback to back
ceiling
USG steel C-H studs
27 USGShaftWallSystems
Elevator Door Framing
ElevatorDoorFraming ElevatorDoorRoughOpening
SectionA-ADetail
Notes1.Framingatelevatordoorshallbeaminimum4"studsandrunners20gauge.2.HorizontalplacementoflinerpanelandC-HStudsperULDesignU437.3.Flangesofthejambstrutmustbecontinuouslybracedbyscrewconnectionstothelinerandfacepanels12"o.c.4.Fordoorsgreaterthan5'wideand/ortransomheightsgreaterthan4',reinforcethe400JS-34withanested400ES-34.
USG steel J-runner
USG steel J-runner
10'-0" max
10'-0" max
USG steel J-runner
USG steel J-runner header
5'-0" max. opening
20 ga. jamb strut
20 ga. jamb strutUSG steel J-runner
USG steel J-runner
USG steel J-runner
screw attachedboth sides
screw attachedboth sides
screw attachedboth sides
Elevator Door Rough Opening
A
A
USG C-H studUSG C-H stud
1" SHEETROCK gypsum liner panelon each side of jamb strut
USG jamb strut
fasten both sides of C-H stud to J runner
1" SHEETROCK gypsum liner panel
screw attachat bottom legof C-H stud
SHEETROCK
FIRECODE Coregypsum panels
USG steel J-runner
structural member
5/8" SHEETROCK
FIRECODE Core gypsum panels
1"SHEETROCK acoustical sealant
1” SHEETROCK gypsum liner panels
USG steel J-runner
SHEETROCK acoustical sealant
locate screws to avoid studs
3/8" J-runner to stud1/2" J-runner to panel
USG steel C-H stud
5/8" SHEETROCK
FIRECODE Core gypsum panels
1” SHEETROCK gypsumliner panels
28 USGShaftWallSystems
Design Details
Wall Systems – C-H Studs and Liner Panels Installed Horizontally
HorizontalShaftwallElevationperULDesignU437 SectionC-CHeadSection
SectionB-BWallIntersection SectionD-DBaseSection
sealant
USG steel J-runner
1" SHEETROCK gypsum liner panel
5/8" SHEETROCK FIRECODE Core gypsum panels
structural member
USG steel J-runners
USG steel J-runner header
A
AUSG C-H studs
1" SHEETROCK gypsum liner panels
B B
C
C
D
D
NoteHorizontalframingshallbeaminimum4"C-HStudsandrunners20gauge.
29 USGShaftWallSystems
Good Design Practices
Use this section as a reference if questions arise during the design or application of USG shaft wall systems.
This section is an overview of good design, application, installation and safety considerations that should be addressed when USG products and systems are used. This section outlines some major issues, but is not intended to be comprehensive.
We recommend that architects and contractors seek the assistance of safety professionals, especially at the construction site, because there are many factors to consider that are not included here. For more detailed information on safety and material handling, please refer to Chapter 13 of The Gypsum Construction Handbook.
1 SystemPerformance USGconductstestsonproductsandsystemstomeetperformancerequirementsspecifiedbyvariousagencies.Upon
writtenrequestwewillprovidetestcertificationforpublishedfire,sound,structuralandotherpertinentdatacovering
systemsdesignedandconstructedaccordingtoourpublishedspecifications.Substitutionsofanyofthecomponents
arenotrecommendedandarenotsupportedbyUSG.
Standards
Thefollowingstandardsapply:
ASTMC1396:StandardSpecificationforGypsumBoard
ASTMC1658:StandardSpecificationforglass-matGypsumPanels
ASTMC1325:StandardSpecificationforNon-AsbestosFiber-MatReinforcedCementitiousBackerUnits
ASTMC1278:StandardSpecificationforFiber-ReinforcedGypsumPanel
ASTMC840:StandardSpecificationforApplicationandFinishingofGypsumBoard
ASTMC754:StandardSpecificationforInstallationofSteelFramingMemberstoReceiveScrew-AttachedGypsum
Board,BackingBoard,orWater-ResistantBackingBoard
ASTMC645:StandardSpecificationforNon-Load(Axial)BearingSteelStuds,Runners(Track),andRigidFurring
ChannelsforScrewApplicationofGypsumBoard
ASTMC475:StandardSpecificationforJointTreatmentMaterialsforGypsumWallboardConstruction
ASTMC1002:StandardSpecificationforSteelDrillScrewsfortheApplicationofGypsumBoard
ASTMC1047:StandardSpecificationforAccessoriesforGypsumWallboardandGypsumVeneerBase
ASTMD3273:StandardTestMethodforResistancetoGrowthofMoldontheSurfaceofInteriorCoatings
inanEnvironmentalChamber
2 FireResistance Usefiretestdatatocompareandselectmaterialsandassemblies,andtosecureacceptancebytheauthorityhaving
jurisdiction.SA100,Fire-Resistant Assemblies,showstestedfireresistanceforvarioussystems.
ForassembliestestedatUnderwritersLaboratoriesInc.(UL),ratingsarespecifictothedesignstested,anddonot
necessarilyapplytoalternateproductsorconstruction.Forexample,insulationmaynotbeaddedtofloor-orroof-ceiling
assemblies,unlessdescribedintheULdesign.Additionofinsulationintheconcealedspacebetweentheceilingmembrane
30 USGShaftWallSystems
Good Design Practices
andthefloororroofstructuremayreducethehourlyratingofanassemblybycausingprematuredisruptionoftheceiling
membraneand/orhighertemperaturesonstructuralcomponentsunderfireexposureconditions.
Increasingthesizeorgaugeofthestud(e.g.,2-1/2"C-Hstud25gaugeto4"C-Hstud20gauge)doesnotaffect
thefireresistanceratingoftheassembly.
Formoredetailedinformation,refertothesystemfireresistancePerformanceSelectoronpages14-15.
3 StructuralCriteria Structuredesignmusttakeintoaccounttheconditionsthatwillexistandtheresultingstressesandmovements.Loadbearing
wallsincludetheexteriorwallsofabuildingandsomeinteriorwalls.Thesestructuresmustbedesignedtocarrytheweightof
thestructure,itscomponentsandotherloadsthatoccuroncethebuildingisoccupied.
Theamountofaxialloadthatstructuralmemberscanbearwillvarywiththeamountoflateralload(pressurefromwind
orotherhorizontalstresses)thatthefinalassemblymayincur.
Manufacturersofstructuralcomponents,particularlysteelframing(studs,runners,joists)providetablesthatidentifythe
maximumallowableloadsforvariouscomponentsunderspecificconditions.Thesetablestypicallystartat5psflateralloads
andincreasein5or10psfincrementstoabout40psf.Interiorpartitionsarepercodedesignedfor5psflateralloads.
Interiornon-bearingpartitionssuchasuSgshaftwallarenotdesignedtocarryaxialloads.Limitingheightsarebasedon
stressordeflectionlimitsforgivenlateralloads.Heightlimitationsdependonthegaugeofthesteelused,dimensionsofthe
stud,studspacing,andtheallowabledeflectionlimit.Forlimitingheighttables,seepage17;forhorizontalshaftwallspan
table,seepage20;andforlimitingheights,unlinedreturnairshafts,seepage18.
Note:Sizeandgaugeavailabilityisbaseduponlimitingheightstables.Othersizesandgaugeshavenotbeen
evaluatedforperformance.
4 ControlJoints— Locatingcontroljointsistheresponsibilityofthedesignprofessional/architect.Integratethesesuggestionswith
BuildingMovement projectconditionswhendeterminingspecificlocationsforcontroljoints.
“Controljoint”isageneraltermformethodsusedtominimize(noteliminatethepotentialfor)crackinginpartitions
andceilings.Specifically,acontroljointminimizescrackinginthefaceofapartitionorceiling.Attheperimeterofapartition
orceiling,itiscalledaperimeterreliefjoint.
Acontroljointiseffectiveinminimizingcrackingcausedbytensileorcompressivemovementinamembraneresulting
fromthermal,hygrometricandstructuralmovement.Isolateshaftwallsurfaceswithcontroljointsorothermeanswhere:
–constructionchangeswithintheplaneoftheshaftwall
–shaftwallrunexceeds30'
–expansionorcontroljointsoccurthroughthebuildingitself
–instairwellsateachfloorlevel
Ceiling-heightdoorframesmaybeusedascontroljoints.Less-than-ceiling-heightdoorframesshouldhavecontroljoints
extendingtoceilingfrombothcornersonbothsidesofthepartition.Treatwindowopeningsinsamemannerasdoors.
Zinccontroljoints,whenproperlyinsulatedandbackedbygypsumpanels,havebeenfire-endurancetestedforusein
one-andtwo-hourfire-ratedwalls.
Properinstallationofcontroljointsinpartitionsandceilingsrequiresbreakingthegypsumpanelsorlathbehindthecon-
troljoint.Inceilingconstruction,theframingshouldalsobebroken.Inpartitions,separatestudsareusedoneachsideofthe
jointwiththerunnertrackseparatedatthatlocation.
5 PressureLoads— Whereshaftwallsencloseelevatorandreturnairvents,andintermittentpressuresupto15psfareexpected,
MinimizingWind Sheetrockacousticalsealantisrecommendedatintersectionswithfloors,ceilings,columns,ducts,etc.toseal Noise peripheriesandpenetrationsandminimizewhistlinganddirtaccumulationduetoairmovement.Sealantselectionincluding
31 USGShaftWallSystems
jointtreatment,surfacecoatingsanddetailstosealthewallunderthesesustainedpressuresmustbeprovided
bythedesigner.Seepages16-17forinformationonevaluatingpressureloadingandselectingtheappropriateframing
componentsbaseduponthesedesigncriteria.
6 PressureLoads— Shaftwallsmaybeusedforairhandlingwithsustainedpressuresupto10psf.Whenairpressureexceeds10psf,
AirHandling airhandlingshouldbecontainedwithametalduct.Seepages18-19forinformationaboutairhandlingandvent
shaftenclosures.
7 Penetrations Penetrationsoftheshaftwall,suchasdoorframesandductopenings,requireadditionalreinforcementatcornersto
distributeconcentratedstressesifacontroljointisnotused.Penetrationsgreaterthan48"widerequiresupplemental
supportfortheshaftwallattheopening.Whereaccesspanelsorlargeductpenetrationsoccurinshaftshavingpressure
loads,headers,sillsandadjacentchannelsmayrequirereinforcingtoproperlydistributetheseloads.
8 SoundControl Usesoundtestdatatocompareandselectmaterialsandconstructions.Thesedatafrequentlyareessentialforsecuring
compliancebytheagencyhavingjurisdiction.SeeSA200,Acoustical Assemblies,foracousticalperformance.
Soundcontrolreferstotheabilitytoattenuatesoundpassingthroughapartition.TheSoundTransmissionClass(STC)isa
widelyusedratingofsoundattenuationperformance.Itisrelativelyaccurateforspeechsoundsbutnotformusic,mechanical
equipmentnoiseoranysoundwithsubstantiallow-frequencyenergy.ItistestedperASTME90andratedperASTME413.
SeethePerformanceSelectorfortheSTCratingsforuSgshaftwallsystems.
SoundtestsareconductedunderideallaboratoryconditionsperASTMprocedures.USGproductsareassembledinaspecific
mannertomeettherequirementsoftheseASTMprocedures.Substitutionofmaterialsotherthanthosetestedordeviation
fromthespecifiedconstructionmayadverselyaffectperformance.
Fieldperformancedependsonbuildingdesignandcarefulattentiontodetailingandworkmanship.Wherethese
partitionsareusedforsoundcontrol,sealthepartitionperimeterwith1/4"min.roundbeadofSheetrockacoustical
sealant.Sealaroundallpenetrations.
9 Moisture Understandingwaterandmoldanditsimpactontheconstructionprocessandbuildingmaterialsareintegralto
andMold gooddesignandconstructionpractices.USGoffersreferencesandadditionalsourcesthatreinforcegooddesign,
constructionandmaintenancepractices.Thesepracticesaregenerallyrecognizedasnecessarytominimizemoisture-
relatedproblemsandthegrowthofmoldinabuildingenvironment.Ifyouhaveadditionalquestions,pleasecontactthose
sourcesorUSG.
Thebestwaytoaddressmoldistomakesurethatbuildingmaterialsdonotgetwetbeforeandduringinstallationandare
notexposedtomoistureinsidethefinishedbuilding.SeeMoisture/MoldinthePerformanceTestingsectionformoreinformation.
10 AirandWater Flashingandsealantsasshownintheconstructiondocumentsandasselectedbythearchitectand/orstructuralengineer Infiltration shouldbeprovidedtoresistairandwaterinfiltration.Theflashingandsealantsselectedshallbeinstalledinaworkmanlike
mannerinappropriatelocationstomaintaincontinuityofair/waterbarriers,particularlyatwindows,doorsandother
penetrationsofexteriorwall.
11 VaporRetarders Watervaporcontrolmustalwaysbeconsideredinthedesignofexteriorwallsystems.Humidityandtemperatureconditions
mayrequiretheinstallationofavaporretardertopreventmoisturecondensationwithinthewallandtheresultingdamage.
Todeterminethenecessityandlocationofvaporretarders,awatervaportransmissionanddewpointanalysisofthelayered
wallassemblyshouldbeconductedbyaqualifiedengineer.
32 USGShaftWallSystems
Good Design Practices
12 ProductHandling GypsumPanels
andStorage Protectallgypsumproductsfromexposuretoexcessiveorcontinuousmoistureandtheelementselementsbefore,during
andafterinstallation.Eliminatesourcesofmoistureimmediately.
MetalFramingProtection
Givelight-gaugemetalcomponentssuchassteelstudsandrunners,furringchannelsandresilientchannelsadequateprotection
inthewarehouseandonthejobsiteagainstrustingcausedbymoisture.InmarineareassuchastheCaribbean,Floridaandthe
GulfCoastwherechlorideandseasaltarepresentincombinationwithexcessivelyhighhumidity,useofcomponentsthatoffer
increasedprotectionagainstcorrosionisrecommended.
13 Application Call-ButtonFloorIndicatorandElectricBoxes
Shaftwallswillaccommodateoutletboxeswithdepthsuptothestudwidth.Seepage24fordetails.
FramingAttachment
Runnersandstudsattachedtobeamsorcolumnsmayneedtobeinstalledbeforesteelisspray-fireproofed.Excess
fireproofingshouldberemovedfromrunnersandstudsbeforeinstallingshaftwalllinerandsealant.
SheetrockGypsumLinerPanelApplication–ButtJoints
WhenaninstallationofuSgshaftwallheightexceedsmaximumavailablepanellength,itisnecessaryto
incorporateabuttjointbetweentwolinerpanels.Staggerbuttjointsinadjacentpanelstopandbottomtoprevent
acontinuoushorizontaljoint.Jointshouldbelocatedintoporbottomthirdofwall.Horizontaljointsneednotbebacked
bysteelframingtomaintainthefire-ratingoftheassembly.
14 PaintingSystems PaintingproductsandsystemsshouldbeusedthatcomplywithrecommendationsandrequirementsinappendicesofASTM
C840.Forpriminganddecoratingwithpaint,textureorwallcovering,followmanufacturer’sdirections.
Allsurfaces,includingappliedjointcompound,mustbethoroughlydry,dust-freeandnotglossy.PrimewithSheetrock
FirstCoatorwithanundiluted,interiorlatexflatpaintwithhigh-solidscontent.Allowtodrybeforedecorating.
Toimprovefastenerconcealment,wheregypsumpanelwallsandceilingswillbesubjectedtosevereartificialornatural
sidelightinganddecoratedwithaglosspaint(eggshell,semi-glossorgloss),thegypsumpanelsurfaceshouldbeskim
coatedwithjointcompoundtoequalizesuctionandtexturedifferencesbetweenthedrywallfacepaperandthefinishedjoint
compoundbeforepainting.SheetrocktuFF-hideprimer-surfacerskimsandprimesinasingleapplication.
15 Screws Type Sscrewsaresuitableforgypsumpanelorgypsumbaseattachmentto25and20ga.steelstuds.Type S-12screws
shouldbespecifiedforotherapplicationstosteelheavierthan20ga.Screwlengthsshouldbe1"forbaselayer(1-1/4"
when3/4"ultracodeisused)and1-5/8"forfacelayerandatleast3/8"longerthanthetotalthicknessforotherapplications.
Wallsover16'highshouldhavestudsscrew-attachedtorunners.
16 SteelDoorFrames Orderedseparately,shouldbeatleast16ga.steel,shopprimed,andhavethroatsaccuratelyformedtooverall
thicknessoftheshaftwallplus3/32"minimum.Theyshouldbeanchoredatfloorwith16ga.steelplatesweldedtotrim
flanges,withprovisionfortwopower-drivenanchorsorequalperplate.Jambanchorsshouldbe18ga.steelweldedinjamb
andscrew-attachedtoanchors.
USGreservestherighttomakechangesorimprovementsinthedesignofallcatalogueditemswithoutnoticeandwithout
obligationtoincorporatethesechangesorimprovementsinitemsalreadymanufactured.
ThisguidespecificationisprovidedtoassistyouinspecificationofuSgshaftwallsystems.IfyouhaveadditionalquestionsorwouldlikemoreinformationregardingthisorotherUSGproductsandsystems,pleasecontactUSGat800USG.4YOUorvisitusgdesignstudio.com
Part 1: General
1.1 Drawingsandgeneralprovisionsoftheprojectcontract,includingGeneralandSupplementaryConditionsandDivision1RelatedDocuments SpecificationSections,applytothisSection.USGSystemFolderSA926–uSgShaftWallSystems.
1.2 SpecifytheappropriateuSgshaftwallsystemtomeetprojectrequirementsforfireresistance,structuralScope performance,soundcontrolandaesthetics.
1.3 A. ThissectionincludesthefollowinguSgshaftwallsystemsSummary 1. Verticalshaftenclosures
2. Stairenclosures
3. Horizontalassemblies
4. Ventshaftenclosures
B. RelatedSections:
1. Division9Sheetrockgypsumpanelsandassemblies
2. Division9iMperialgypsumbaseandVeneerPlasterAssemblies
1.4 A. ShaftWall:Anassemblyofsteelframing,gypsumboardsandothermaterialsusedtoencloseelevatorshafts,Definitions stairways,airshaftsandmechanicalcomponents.
B. GypsumBoardConstructionTerminology:RefertoASTMC11fordefinitionoftermsforgypsumboardconstructionnot
definedinthisdocument.
1.5 A. ThesystemsareULListedforfireresistance.Performance B. Systemfire-resistancetestingwithelevatordoormanufactureratUL.Requirements
C. Fire-resistancetestedpenetrationdetailsforcall-buttonboxesandpositionindicators.
D. Oscillationtestedto1millioncyclestoensureperformanceofthelifeofthebuilding.
E. ULListedfiredamperapplication.
F. AirPressureLoads—Selectbasedonprojectrequirements.SeedetailsinthisbrochureforuSgshaftwall
systemdata.
G. DeflectionLimit—Selectbasedonprojectrequirements.SeedetailsinthisbrochureforuSgshaftwall
systemdata.
H. STCRating—Selectbasedonprojectrequirements.
I. HardenedShafts—Whererequiredbycode,forbuildingsclassifiedashigh-risebuildings,specialprovisions
mayberequired.
1.6 A. ProductandSystemData–SubmitsystemfolderSA926,whichcanbedownloadedatusg.com.Submittals B. Submitcertificationofmanufacturercompliancewithfireandsoundrequirementsindicated.
C. Fireratingcomplianceshallincludeverificationofcompatibilitywithlabeledelevatordoorframeinstallationandtest
verificationofcallboxandsimilarpenetrations.
33 USGShaftWallSystems
Application Guide Specifications
34 USGShaftWallSystems
Application Guide Specifications
1.7 A. Delivermaterialsintheiroriginalunopenedpackagesbearingmanufactureridentification.Delivery,Storage B. Protectmaterialsfromwettinganddamagefromweather,directsunlight,surfacecontamination,corrosion,constructionandHandling
trafficandothercauses.ofMaterials C. Warning:StoreallSheetrockgypsumpanelsflat.Panelsareheavyandcanfallover,causingseriousinjuryordeath.
Donotmoveunlessauthorized.
1.8 A. Allmaterialsshallbesuitablyprotectedfromtheweatherduringinstallationtopreventdamagetotheshaftwall.ProjectConditions B. Installgypsumpanelsfollowingenvironmentalconditions,roomtemperaturesandventilationspecifiedintheUSG
Gypsum Construction Handbook.
1.9 A. ProtectuSgshaftwallsystemandcomponentsfrommoisturebefore,duringandafterinstallation.QualityAssurance Eliminatesourcesofmoistureimmediately.
B. Fire-ResistanceRatedAssemblies:ProvideULDesignNumber(e.g.,U415)forbasicsystems.
C. Sound-RatedAssemblies(STC)—Providesound-ratedsystemwhosematerialsandconstructioncomplywith
requirementsofASTME90andareclassifiedaccordingtoASTME413byaqualifiedtestingagency.
D. PreinstallationConference–Conductconferenceatprojectsite.Reviewmethodsandproceduresforworkrelatedto
uSgshaftwallsystemassemblies.
Part 2: Products
2.1 A. SupplymaterialsmanufacturedbyorfortheUnitedStatesGypsumCompanythatcomplywithrequirementsofManufacturer fire-resistanceratedassembliesindicatedinSystemFolderSA926.
B. BasisofDesign—uSgshaftwallsystem
2.2 A. GypsumLinerPanels—ASTMC1396,1"Sheetrockgypsumlinerpanels,100%recycledgreenfaceandbackMaterials paper,bevelededge,24"wide,lengthsasrequired.StampedwithULClassificationlabeldocumentingULClassifications
forfireresistance,surfaceburningcharacteristics,andnoncombustibility.Panelsshouldalsobeidentifiedwiththe
followinglanguage:“Sheetrockbrandgypsumlinerpanel,aComponentofUnitedStatesGypsumCompanyFire
RatedSystems.”
B. Sheetrock Mold toughGypsumLinerPanels—ASTMC1396,1SheetrockMold toughgypsumlinerpanels,100%
recycledbluefaceandbackpaper,bevelededge,24"wide,lengthsasrequired.StampedwithULClassificationlabel
documentingULClassificationsforfireresistance,surfaceburningcharacteristics,andnoncombustibility.Panelsshould
alsobeidentifiedwiththefollowinglanguage:“SheetrockbrandMold toughgypsumlinerpanel,aComponentofUnited
StatesGypsumCompanyFireRatedSystems.”
C. SheetrockGlass-MatLinerPanels—ASTMC1658,1"Sheetrock glass-matlinerpanels,moisture-andmold-
resistantgypsumcoreencasedinamoisture-andmold-resistantglassmatonbothsides,24"wide,lengths
asrequired.StampedwithULClassificationlabeldocumentingULClassificationsforfireresistance,surface
burningcharacteristicsandnoncombustibility.Panelsshouldalsobeidentifiedwiththefollowinglanguage:
“Sheetrockglass-matlinerpanel,aComponentofUnitedStatesGypsumCompanyFireRatedSystems.”
35 USGShaftWallSystems
D. GypsumWallboard—ASTMC1396,(1/2")(5/8")(3/4")(selectthickness),4wide,taperededge,Sheetrockgypsum
panels,(FirecodeCore)(FirecodeCCore)(ultracodeCore)(Mold toughFirecodeCore),ASTMC1287(Fiberockaqua-
toughinteriorpanel)(Fiberockabuse-resistantinteriorpanels)(selectcoretype),lengthsasrequired.IdentifiedwithUL
Classificationlabel.
E. GypsumBaseforGypsumVeneerPlaster—ASTMC1396,(1/2")(5/8")(selectthickness),4wide,iMperialgypsum
base(FirecodeCore)(FirecodeCCore)(selectcoretype),lengthsasrequired.
F. CementBoard—ASTMC1325,durockcementboard,1/2"and5/8"thickness,48"widthx96"length.
G. GypsumWallboardandGypsumBaseJointTreatmentMaterials—selectaUSGInteriorFinishingSystem
(seeproductfolderJ1424).
H. Fasteners—ASTMC1002,Screws:(3/8")(1/2")Type(S)(S-12)panhead;5/8"Type S-12lowprofilehead;(1")
(1-5/8")(2-1/4")Type Sbuglehead.durocktilebackerscrewsforsteelframing:1-5/8".TypeGscrews:1-1/2".
I. MetalTrim—ASTMC1047,No.(200A)(200B)(401)(402)(701B)(801B).
J. Sheetrockpaperfacedmetalbeadandtrim.
K. Steelfurringchannels.
L. RC-1resilientchannelsorequivalent.
M. USGsteelC-Hstuds,(212CH-18)(212CH-34)(400CH-18)(400CH-34)(600CH-34)hot-dippedgalvanized,lengthsas
required(selectfromtables).
N. USGsteelE-studs,(400ES-34)(600ES-34)hot-dippedgalvanized,lengthsasrequired(selectfromtables).
O. USGsteelJ-runners,(212JR-23)(400JR-23)(600JR-23)(212JR-34)(400JR-34)(600JR-34)hot-dippedgalvanized.
P. Steelangleclips20gauge,(2"x2"x2")(2"x2"x4")(horizontalshaftwallonly).
Q. USGsteeljambstruts,(212JS-34)(400JS-34)(600JS-34)hot-dippedgalvanized.
R. Runnerfasteners,power-driventype,towithstandrequiredsingleshearandbearingforcewhendriventhroughstructural
headorbaseandwithoutexceedingallowabledesignstressinrunner,fastenerorstructuralsupport(obtainlocally).
S. Sheetrockacousticalsealant.
T. Soundbatts–(1")(1-1/2")(3").
U. Zinccontroljoint#093.
Part 3: Execution
3.1 Examinesubstratesandabuttingassemblieswithinstallerpresent.ProceedwithinstallationafterconditionsExamination determinedtobesatisfactory.
3.2 A. CheckthatsystemcomponentsareavailabletoconstructuSgshaftwallsystemPreparation –Sheetrockgypsumlinerpanels
–SheetrockMold toughgypsumlinerpanels
–Sheetrock glass-matlinerpanels
–SheetrockFirecode,FirecodeC,orultracodeCoregypsumpanels
–SheetrockMold toughFirecodeCore,FirecodeCCoreorultracodeCoregypsumpanels
–durockcementboard
–Fiberockabuse-resistantinteriorpanels
36 USGShaftWallSystems
Application Guide Specifications
–Fiberockaqua-toughinteriorpanel
–iMperialFirecodeCoreorFirecodeCCoregypsumbase
–USGsteelframingcomponents(C-Hstuds,J-runner,E-studs,jambstruts)
B. Otherfire-resistiveelements/materials:CoordinateinstallationofuSgshaftwallassemblywithsprayed
fire-resistivematerialsandotherfire-resistiveelementssothatbothelementsremaincompleteandundamaged.
3.3 A. USGSteelFramingandSheetrockGypsumLinerPanelsShaftWall 1. PositionsteelJ-runnersatfloorandceilingwiththeshortlegtowardfinishsideofwall.Installation
2. Securelyattachrunnerstostructuralsupportswithpowder-actuatedfastenersatbothendsandmax.24"o.c.
3. Forattachmenttosteelframeconstruction,installfloorandceilingJ-runnersandJ-runnersorE-studsoncolumnsand
beamsbeforesteelisfireproofed.
4. Forattachmenttostructuralsteel,useZ-shapedstand-offclipssecuredtostructuralsteelbeforefireproofingapplication.
5. Removespray-fireproofingfromJ-runnersandE-studsbeforeinstallinggypsumlinerpanels.
6. Forwallheightslessthanmaximumavailablepanelheight,cutgypsumlinerpanelsnomorethan1"lessthanfloor-to-
ceilingheightanderectverticallybetweenJ-runners.
7. Whereshaftwallheightshaftexceedsmaximumavailablepanel-length,piecesofgypsumlinerpanelmustbebutted
togetheratfactory-cutends.
a. Positiongypsumlinerpanelendjointswithinupperandlowerthirdpointsofwall.
b. Staggerjointstopandbottominadjacentpanels.
c. Screwstudstorunnersonwallsover16'.
8. CutC-Hstuds3/8"tonotmorethan1/2"lessthanfloor-to-ceilingheight.
9. InstallC-Hstudsbetweengypsumlinerpanelswithlinersecurelyengaged.
10. Terminations:Installfull-lengthsteelE-studsorJ-runnersverticallyatT-intersections,corners,doorjambsandcolumns.
11. Openings:FramewithverticalE-studorJ-runneratverticaledges,horizontalJ-runneratheadandsill.Reinforceas
showninthisbrochure.Suitablyframeallopeningstomaintainstructuralsupportforwall.
12. ElevatorDoorFrames:Installjambstrutseachsideofelevatordoorframestoactasstrut-studs.
13. SteelHingedDoorFrames:Installfloor-to-ceilingsteelE-studseachsidetoactasstrut-studs.
14. Attachstrut-stud(see3.2.A.12or3.2.A.13)tofloorandceilingrunnerswithtwo3/8"Type S-12panheadscrews.
Attachstrut-studstojambanchorswith1/2"Type S-12screws.Oversteeldoors,installacut-to-lengthsectionof
J-Runnerandattachtostrut-studswith3/8"Type S-12screws.
B. ResilientChannels
1. Installresilientchannels(RC-1orequivalent)horizontallytofaceofstuds,within6"offloorandceiling.
2. Applyresilientchannelsamaximumof24"o.c.vertically(withopenfaceup).
3. Attachresilientchannelstostudswith3/8"Type Sscrewsdriventhroughholesinmountingflange.
4. Splicechannelbynestingdirectlyoverstud;screw-attachthroughbothflanges.Reinforcewithscrewsatbothendsofsplice.
5. Install1/2"x3"widecontinuousgypsumfillerstripstotopandbottomrunner.
6. Gypsumpanelapplicationwithresilientchannel:Applybaselayerhorizontallytoresilientchannelswithendjoints
staggered.Fastenwith1"Type Sscrews12"o.c.Applyfacelayerverticallywithjointsstaggered;attachtochannels
with1-5/8"Type Sscrews12"o.c.
C. SheetrockGypsumPanels
Gypsumpanelsandfasteningmustbeperthecorrespondingfire-resistancedesignnumberthatisthebasisofdesign.
SeethePerformanceSelectorinthisbrochureforspecificfire-resistancedesignnumbers.Thesystemreferencesbelow
37 USGShaftWallSystems
correspondtothePerformanceSelectorfoundonpages14-15.
PerULDesignU415,Sheetrockgypsumpanelsmaybeappliedverticallyorhorizontallyinallofthesystems
below,exceptSystemF.Pleasenoteappropriatefastenerspacing.
SystemA—U415orU469,one-hourfire-resistancerating.Applyonelayer5/8"SheetrockFirecodeCoregypsum
panelstostudsandrunnerswith1"Type SorS-12(typical)screws.Fastenerspacing–Spacescrews12"o.c.for
verticalpanelapplication,8"o.c.forhorizontalpanelapplication.
SystemB—U415orU438,two-hourfire-resistancerating.Applytwolayersof1/2"SheetrockFirecodeCCore
gypsumpanels.Applybaselayertostudswith1"Type SorS-12(typical)screws.Spacescrews24"o.c.alongedges
andinthefieldofthepanelsforverticalapplication,16"o.c.forhorizontalapplication.Applyfacelayertostudsand
J-runnerswith1-5/8"Type SorS-12(typical)screws.Spacescrews12"alongtheedgesandinthefieldwhenapplied
vertically,8"o.c.whenappliedhorizontally.Staggeralljointsbetweenbaseandfacelayers.
SystemD—U415orU459,two-hourfire-resistancerating.Install1-1/2"therMaFiber™SAFBmineralwoolbattsin
studcavity.Applybaselayerof5/8"SheetrockFirecodeCCoregypsumpanelsusing1"Type SorS-12(typical)screws
spaced24"o.c.whenboardisappliedvertically.Spacescrews16"o.c.whenboardisappliedhorizontally.Applyface
layerof1/2"durockcementboardtoC-HStudswith1-5/8"durocktilebackerscrewsspaced8"o.c.
SystemE—U415orU467,two-hourfire-resistancerating.Applyonelayer1/2"SheetrockFirecodeCCoregypsum
panelstobothsidesofC-Hstuds.Fastenwith1"Type SorS-12(typical)screws.Spacescrews12"o.c.alongthe
edgesandinthefieldforverticalpanelapplication,8"o.c.forhorizontal.
SystemF—U415,two-hourfire-resistancerating.Applybaselayer1/2"SheetrockFirecodeCCoregypsumpanels
toresilientchannelswith1"Type SorS-12(typical)screwsspaced24"o.c.Staggerendjoints.Applyfacelayer1/2"
SheetrockFirecodeCCoregypsumpanelswith1-5/8"Type SorS-12(typical)screwsspaced12"o.c.
SystemG—U415,three-hourfire-resistancerating.Applytwolayersof5/8"SheetrockFirecodeCCoregypsum
panelsusingType SorS-12(typical)screwsspaced12"o.c.Applyfirstandsecond(inner)layersverticallyorhorizontally
overroomsideofsteelC-Hstuds.Whenappliedvertically,centerjointsbetweenpanelsoverstuds.Staggeralljointsa
minimum24".Whenpanelsareappliedhorizontally,staggerjointsaminimum12".Applythirdlayerof5/8"Sheetrock
FirecodeCCoregypsumpanelsverticallyorhorizontallyoverroomsideofsteelC-Hstudsusing2-1/4"Type SorS-12
(typical)screws.Spacescrews16"o.c.whenboardisappliedvertically,12"o.c.whenboardisappliedhorizontally.
SystemH—U415,three-hourfire-resistancerating.AlternatetoSystemGabove.Applythirdlayerof5/8"Sheetrock
FirecodeCCoregypsumpanelstoothersideofsteelC-Hstuds.
HorizontalAssemblies—two-hourfire-resistancerating.Installthreelayersof1/2"SheetrockFirecodeCCoregypsum
panelstohorizontallyinstalledC-Hand/orE-studs.Applythebaselayerwith1"Type SorS-12(typical)screwsspaced
24"o.c.Applythemid-layerinthesamemannerwithjointsoffset2'andattachedwith1-5/8"Type SorS-12(typical)
screwsspaced12"o.c.Applythefacelayerattachedwith2-1/4"Type SorS-12(typical)screwsspaced12"o.c.Place
facelayerendjointsbetweenstudsandsecurewith1-1/2"TypeGscrews8"o.c.
HorizontalStudShaftWall
1. AttachhorizontalJ-runnersatthefloorandtopofwallandverticalJ-runnerstostructuralsupportingelementswith
powder-actuatedfastenerslocatednotgreaterthan2"fromendsandspacednomorethan24"oncenterwithshort
legofJ-runnertowardthefinishsideofthewall.
2. Installgypsumlinerpanelshorizontallywithoutbuttjoints,whichlimitsthewidthofthewalltotheavailablelength
ofthelinerpanels.
3. Cutgypsumlinerpanels1"lessthanthewidthofthewall,andcenterthepanelsbetweentheverticalJ-runners.The
topedgeoftheuppermostlinerpaneltobecut1"lessthanthewallheighttoclearthe1"legofthetopJ-runner.
4. FreeedgeoftheuppermostandlowerlinerpanelsattachedtothelonglegofthetopandbottomJ-runnerswith1-5/8"
longTypeSorS-12steelscrewsspacednogreaterthan12"oncenters.
5. CutC-Hstudstomaintaina1/4"gapateachendofthewall.
6. InstallC-Hstudshorizontallywiththeopen“C”sectionofthestudsfacingdownandspaced24"oncenter.
7. Steelanglesshouldbeminimum20gauge,2"x2"x2"for4C-Hstuds,and2"x2"x4"for6C-Hstuds.Clipsare
centeredunderandtighttotheweboftheC-Hstuds,butnotattachedtothestuds.Clipsareattachedthroughtheweb
oftheverticalJ-runnerstotheunderlyingstructuralsupportingelementwithaminimumoftwo1/2"TypeS-12pan
headscrews.
8. Asanalternativetotheprecedingangleclip,fasteneachendofthehorizontalC-HstudtotheverticalJ-runnerlegs
with1/2"TypeS-12pan-headsteelscrewsonbothsidesofthewall.
9. EndreactionsofthehorizontalC-Hstudsmustbeaccommodatedbythestructuralelementrequiredattheendsofthe
wall,andmustbedeterminedbyalicensedprofessionalengineer.
10. Theallowableheightofthewallispredicatedonthestructuraladequacyoftheverticalstructuralelements.
D. SheetrockGypsumPanels(forverticalandhorizontalshaftwalls)
VentShaftEnclosure—U529,two-hourfire-resistancerating.Install1"x2"x25"ga.galvanizedsteelanglesasrun-
nersonfloor,ceilingsandpartitionends.Fastenrunnersoranglessecurelytostructurewithsuitablefastenersspaced
24"o.c.max.Install1/2"SheetrockFirecodeCCoregypsumpanelsvertically.Fastentoangleswith1"Type SorS-12
(typical)screwsspaced12"o.c.ApplySheetrock®durabond®setting-typeorSheetrock® eaSy Sand™lightweightsetting-
typejointcompoundonbacksideoflinerpanelandsheet-laminatetoshaft-sideboardwithverticaljointsoffset12"
frominnerboardjoints.Alsoscrewtoshaftsideboardwith1-1/2"longTypeGscrewsspaced24"o.c.inbothdirections.
Laminatefaceboardtolinerpanelsinsimilarmanner.Installfaceboardsverticallywithjointsoffset12"fromlinerpanel
joints.Applypressurewhenplacingboardstoensuregoodadhesivebondandfastentolinerpanelwith1-1/2"TypeG
screws,spaced24"o.c.
3.4 A. GypsumPanelJoints—FinishallfacelayerjointsandinternalangleswithaSheetrockinteriorfinishingAccessory systeminstalledaccordingtomanufacturer’sdirections.SeeproductfolderJ1424fordetailedrecommendations.Application
B. CornerBead—ReinforceallverticalandhorizontalexteriorcornerswithSheetrockpaperfacedbead.Seeproduct
folderJ1424fordetailedrecommendations.
C. MetalTrim—Whereshaftwallterminatesagainstmasonryorotherdissimilarmaterial,applySheetrockpaperfaced
beadandtrimoverfacelayeredge.
38 USGShaftWallSystems
Application Guide Specifications
About the cover:
Project
Skybridge at One North Halsted
Chicago, IL
Recipient of the 2004 AIA Honor Award
Architects
Perkins & Will
Ralph Johnson, FAIA
Chicago, IL
Photographer
©James Steinkamp
Manufactured by United States Gypsum Company550 West Adams StreetChicago, IL 60661
SA926/rev. 5-10© 2010, United States Gypsum CompanyPrinted in U.S.A.
Product InformationSee usg.com for the most up-to-date product information. Metric SpecificationsUSG Corporation, through its operating subsidiaries, will provide metric conversions on its products and systems to help specifiers match metric design sizes. In addition, some products are available in metric dimensions from selected manufacturing plants. Refer to SA100, Fire-Resistant Assemblies, for additional information and a Table of Metric Equivalents.TrademarksThe following trademarks used herein are owned by United States Gypsum or a related company: AquA-Tough, Dur-A-BeAD, DurABonD, Durock, eAsy sAnD, FiBerock, FirecoDe, imperiAl, molD Tough, plus 3, rc-1, sheeTrock, TuFF-hiDe, ulTrAcoDe, USG. Type s and S-12 are trademarks of ITW buildex. ThermAFiBer is a trade-mark of ThermAFiBer llc. LEED is a registered trademark of U.S. Green Building Council.
NoticeWe shall not be liable for incidental and consequential damages, directly or indirectly sustained, nor for any loss caused by application of these goods not in accordance with current printed instruc-tions or for other than the intended use. Our liability is expressly limited to replace-ment of defective goods. Any claim shall be deemed waived unless made in writing to us within thirty (30) days from date it was or reasonably should have been discovered.Note All products described here may not be available in all geographic markets. Consult your local sales office or representative for information.Safety First!Follow good safety and industrial hygiene practices during handling and installation of all products and systems. Take necessary precautions and wear the appropriate personal protective equipment as needed. Read material safety data sheets and related literature on products before specification and/or installation.
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