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Fire performance, beauty and
durability for interior residential
and commercial spaces
Plaster Systems
Plaster systems offer a number of practical and aesthetic advantages over gypsum panels and other interior finishes. Plaster permits a great deal of design flexibility, combined with fire performance, strength and durability. These factors improve lifecycle economy when compared to drywall. Because plaster systems are truly monolithic, they provide surfaces that minimize or eliminate irregularities associated with standard drywall construction (ridging, boarding, nail pops, etc.).
Beauty and Strength
� USGPlasterSystems
User’s Guide
This brochure explains: – The components of a plaster system – The difference between conventional plaster systems and one- or
two-coat veneer plaster systems – The attributes of conventional and veneer plaster systems
Pages
UnderstandYourSystem 4 Overview
Applications
Components
SelectYourSystem 19 ProductData
PerformanceTesting
PerformanceSelector
DesignYourSystem 42 DesignDetails
GoodDesignPractices
SpecifyYourSystem 54 ApplicationGuideSpecifications
ForMoreInformation TechnicalService 800USG.4YOU WebSite www.usg.com
Plaster systems provide improved fire and abuse resistance over conventional drywall systems. In addition, they allow for a variety of aesthetic applications and better acoustic performance.
Depending on the application, either conventional or veneer plaster systems can be used. Conventional plaster systems use a thicker plaster coat over a metal lath and provide increased fire and wear resistance, while one- or two-coat veneer systems are faster and less expensive to apply.
Plaster systems typically consist of a substrate, a basecoat plaster and a finish plaster.
Substrates Substratescanbeeithermetallath,unitmasonry,monolithicconcrete,orarecommendedgypsumbase,cementboard
orgypsumfiberpanel.
BasecoatPlasters Basecoatplastersprovidestrengthandrigidity,compensatingforsubstrateimperfectionsandresultingineven,
straightwallsandceilings.Inconventionalplastersystems,basecoatplastersaregenerallyapplied1/29to19thick,in
oneortwoseparateapplications,dependingonthesubstrate.Inveneerplastersystems,basecoatplastersareapplied
approximately1/169thick.
Basecoatplastersaresuppliedintwoforms:millaggregated(whichrequiresonlymixingwithwater),andneat
(whichrequirestheadditionofaggregateatthejobsite).
FinishPlasters Inconventionalplastersystems,finishplastersareappliedtoproperlypreparedgypsumbasecoatplasterstoform
thewearingsurfaceofwallsandceilings.Inveneerfinishapplications,finishplasterscanbeappliedtoanyproperly
preparedbasecoatordirectlytoagypsumbase.Finishesareapproximately1/169to3/329thick,andcanbesmooth
troweled,floatedortextured.
Finishplastersaresuppliedintwoforms:factory-preparedfinishesrequireonlytheadditionofwater,whilegauging
plastersrequiretheadditionoflimeputty.
Plaster systems provide improved fire and abuse resistance over conventional drywall systems. In addition, they allow for a variety of aesthetic applications and better acoustic performance.
Depending on the application, either conventional or veneer plaster systems can be used. Conventional plaster systems use a thicker plaster coat over a metal lath and provide increased fire and wear resistance, while one- or two-coat veneer systems are faster and less expensive to apply.
Plaster systems typically consist of a substrate, a basecoat plaster and a finish plaster.
Substrates Substratescanbeeithermetallath,unitmasonry,monolithicconcrete,orarecommendedgypsumbase,cementboard
orfiber-reinforcedgypsumpanel.
BasecoatPlasters Basecoatplastersprovidestrengthandrigidity,compensatingforsubstrateimperfectionsandresultingineven,
straightwallsandceilings.Inconventionalplastersystems,basecoatplastersaregenerallyapplied1/29to19thick,in
oneortwoseparateapplications,dependingonthesubstrate.Inveneerplastersystems,basecoatplastersareapplied
approximately1/169thick.
Basecoatplastersaresuppliedintwoforms:millaggregated(whichrequiresonlymixingwithwater),andneat
(whichrequirestheadditionofaggregateatthejobsite).
FinishPlasters Inconventionalplastersystems,finishplastersareappliedtoproperlypreparedgypsumbasecoatplasterstoform
thewearingsurfaceofwallsandceilings.Inveneerfinishapplications,finishplasterscanbeappliedtoanyproperly
preparedbasecoatordirectlytoagypsumbase.Finishesareapproximately1/169to3/329thick,andcanbesmooth
troweled,floatedortextured.
Finishplastersaresuppliedintwoforms:factory-preparedfinishesrequireonlytheadditionofwater,whilegauging
plastersrequiretheadditionoflimeputty.
4 USGPlasterSystems
Overview
5 USGPlasterSystems
Conventional Three-CoatPlasterSystems Conventionalplastersystemsarethebestchoicetoattainauniform,monolithic,blemish-free,smoothsurface
withgoodtoexcellentwearresistancebasedonthetypeoffinishplaster.Thesesystemsmakeintricatearchitectural
detailsandornamentalshapespossible.Conventionalplastersystemsofferexcellentacousticalperformance,provenfire
resistance,increasedabuseresistance,designflexibilityforcurvesandcompoundsurfaces,andlifecyclecostreduction
duetolowermaintenancecosts.
Athree-coatconventionalplastersystemconsistsofathickerplastercoat(from5/89to19)overasubstrate,two
basecoats(ascratchcoatandabrowncoat)andafinishplaster.
Two-Coat
Atwo-coatconventionalplastersystemusesRocklathPlasterBaseinsteadofmetallath,onethicknessofbasecoat
plaster,andafinishthatreplacesthescratchcoatandbrowncoat.
finish
basecoat–browncoat
basecoat–scratchcoat
metallath
finish
basecoat
gypsumlath
� USGPlasterSystems
Overview
VeneerPlaster Two-Coat Systems Whilelessexpensivethanconventionalplastersystems,two-coatveneerplastersystemsprovidedistinctadvantages
oversingle-coatveneerplasteranddrywallsystems,includingamoremonolithicsurfacewithimprovedappearance
underobliquelightingconditions.Two-coatveneerplastersystemsallowtruerwallsurfacesandgreaterresistanceto
nailpops,jointridgingandjointshadowing/banding,withawiderchoiceoffinishingmaterialsandtextureoptions.
Two-coatveneerplastersystemsuseafinishplasterontopofabasecoatplaster.
One-Coat
One-coatveneerplastersystemsprovideamonolithic,smoothortexturedappearancewithmoderatetosuperiorsurface
hardness,dependingontheproductused.One-coatveneerplastersystemscanbeapplieddirectlytotheplasterbase
andcanbereadyforfurtherdecorationinaslittleas24hoursifcompletelydry.Fastcompletioncanoftenshorten
constructiontime,makingthesingle-coatveneerplastersystemaveryeconomicalupgradefromstandardgypsumdrywall.
One-coatveneerplastersystemsuseonecoatof1/169to3/329finishplasterdirectlyontopofabase,withoutthe
useofabasecoat.
finish
basecoat
gypsumplasterbase
finish
gypsumplasterbase
DecorativeInterior ColorsandTexturesFinishSystem TheUSGTMDecorativeInteriorFinishSystempermitsalimitlessvarietyofcolorsandtexturestobeeasilyappliedtointerior
drywallandotherwallsurfaces,usingtechniquessimilartothoseusedinplasterwork.Itoffersanalternativetoother
upscaledecorativefinishesatalowerinstalledcost.
TheUSGDecorativeInteriorFinishSystemconsistsofspeciallydevelopedUSGPlasterBonder,DiamonDBrand
InteriorFinishPlaster,coloRtRenD®ColorantsandUSGDecorativeInteriorFinishSealer.Designedforusebyprofessional
applicatorswithbasictrowelskills,thesystemcanbeappliedtonewdrywall,gypsumplasterandproperlyprepared
paintedwallsurfaces.
Formoreinformation,seeP759,USG Decorative Interior Finish System,andPM12,Recommendations for Mixing
and Applying DIFS.
ResidentialApplication CommercialApplication
� USGPlasterSystems
8 USGPlasterSystems
Applications
Conventional Conventionalplastersystemsprovidethehighestqualityfinishandthecapabilitytocreatecomplexhigh-endsurfacesPlasterSystems suchasbarrelvaultsanddomes.Inaddition,securedstorageareasforhomes,bankvaults,furriers,jewelers,
correctionalfacilities,andembassiescanbebuiltwithStRuctocoRe™BrandSecurityWallSystems.
WoodFramed
Forwood-framedconstruction,aconventionalplastersystemprovides:
–Fireresistance
–Improvedacousticalseparationbetweenrooms
SteelFramed
Forsteel-framedconstruction,aconventionalplastersystemprovides:
–Fireprotectionforbeamsandcolumns
–Durabilityandreducedlifecyclecostsinhigh-usageapplications
–Improvedperformanceforacousticalapplicationssuchasconcerthallsandtheaters
Veneer WoodFramed PlasterSystems Forwood-framedconstruction,aveneerplastersystemprovides:
–Durability,includingabrasionandcrackresistance,forhigh-trafficareas
–1-hourand2-hourfireresistanceratings,dependingoncomponentsused
–Soundcontrolupto52STCwiththeuseofresilientchannelsandsoundinsulation
–Easyapplicationandfastdryingforsurfacesthatarereadyfornext-daydecoratingorpainting
SteelFramed
Forsteel-framedconstruction,aveneerplastersystemprovides:
–Fire-resistanceratingsupto4hours
–Upto3000psifortheultimateinfinishplasterresistancetoabrasion,scratchingandindentationinhigh-trafficareas
–Soundisolationupto62STC
–Versatilityformostdimensionsormodulesinvirtuallyallbuildings,withexcellentworkability
–Lighterweightthanmasonryassembliesofthesamethickness
–Simple,inexpensivecomponentsthatcanbeinstalledquicklyatalowercostthanconventionalplastersystems
SpecialApplications TheUSGDrywallSuspensionSystemisalow-costalternativetocold-rolledchannelforframingcustomdetailssuchas
barrelvaultsanddomes.Itfeatures:
–Pre-fabricatedhubandpre-formedcurvedtees
–Suitableframingsystemforbothconventionalandveneerplastersystems
Formoreinformation,seeAC3152,Drywall Suspension System.
Components
9 USGPlasterSystems
Substitutions of any of the components are not recommended or supported by USG. Refer to the appropriate product material safety data sheet for complete health and safety information.
Substrates
Selector Conventional VeneerRocklathBrandFiRecoDeCorePlasterBase •
MetalLath •
DuRockBrandCementBoard •
FibeRockBrandARPanels •
impeRialBrandGypsumBase •
MonolithicConcrete • •
UnitMasonry • •
GypsumPlasterLath Rocklath®BrandFiRecodeCorePlasterBase
–Asolidgypsumboardlathforconventionalplaster,withspecialpaperfacingformaximumplasterbond
–Requiresabout45%lessbasecoatplasterthanmetallath
–3/89thick,availablein28widthx88length
–Canbequicklyattachedtoframing,includingwoodstuds(withnails,screws,orstaples),steelstuds,furringchannels,
andsuspendedmetalgrillage(withscrewsand/ortiewire)
MetalLath DiamondMetalLath FlatRiblath �/89Riblath Uses All-purpose;besttypeforornamentaland Excellentfornail-onortie-onworkon Veryrigidlathforframingspacedupto andcontourplastering;exteriorstucco, flatceilingsbecauseofitsrigidity 249o.c.,forstudless,29solidplaster columnfireproofing,direct-to-steelframing partitions,orasacenteringforconcrete (withStRucto-baSeGypsumPlaster)and floororroofslabs replastering;attachedtowoodorsteel framingorwire-tiedtocold-rolledchannel
Pattern Smalldiamondmesh Flatribwithsmallermeshopenings Herringbone
Benefits Small-diamondmeshsize(11,000 — Superiorrigidityfrom3/89mainV-ribs meshespersq.yd.)reducesplaster at4-1/29intervals,plusinverted3/169 droppings;basecoatplasterforced intermediateribs,reinforcingastrong, throughmeshopeningsformsstrong herringbonepatternmesh mechanicalbondwithlath
Limitations Notforcontourplastering Notforcontourplastering; minimumgroundthicknessis19
Coatings Paintedorgalvanized Paintedorgalvanized Paintedorgalvanized
Sizes, 279x969;2.5lbs./sq.yd.and 279x969;2.75lb./sq.yd.and 279x969(othersizesalsoavailable) Weights 3.4lbs./sq.yd.;regular,self-furring 3.4lb./sq.yd. 3.4lb./sq.yd andTypes orpaper-backed(self-furringtypeis “dimpled”with1/49indentations)
Components
10 USGPlasterSystems
Panels duRock®BrandCementBoard
–Glass-fiber-meshreinforcedaggregatedportlandcementpanel
–Improvedabuseresistance
–USG™PlasterBonderrequired
–RefertoproductsubmittalsheetCB399formoreinformation
FibeRock®BrandAbuse-ResistantGypsumFiberInteriorPanels
–Outperformsregulargypsumbase,providingimprovedindentationandpenetrationresistance
–Economicalalternativetoconcreteblockconstruction
–Availableinmesh-backed5/89VHI(VeryHighImpact)version
–5/89panelcanbesubstitutedfor5/89impeRialBrandFiRecoDeCoreGypsumBaseandcertain1/29impeRialBrandFiRecoDe
CCoreGypsumBaseinwallassemblieswithoutcompromisingthefirerating(seeApplicationGuideSpecifications,Part
3.3.5)
–RefertoproductsubmittalsheetF218formoreinformation
impeRial®BrandGypsumBase
–Solidgypsumlathinlarge,drywall-sizedsheets,withbluefacepaper,designedforveneerplastersystems
–Inone-coatveneerapplications,onlyimpeRialandDiamonDFinishPlasterscanbeusedoverimpeRialBrand
GypsumBase
–impeRialBrandFiRecoDeGypsumBase,impeRialBrandFiRecoDeCCoreGypsumBase,impeRialBrandAbuse-Resistant
GypsumBaseorimpeRialBrandultRacoDeCoreGypsumBasecanalsobeused
–RefertoproductsubmittalsheetP782formoreinformation
Monolithic MonolithicConcrete
–Plastercannotbeapplieddirectlytointeriorsurfaceofexteriorwall;thewallshouldbefurredfirstandthensuitable
substrateappliedtofurring
–USGPlasterBonderrequired
–Two-coatveneerrecommended
UnitMasonry
–Mayserveassubstrateforatwo-coatveneersystemoninteriorwalls
–Plastercannotbeapplieddirectlytointeriorsurfaceofexteriorwall;thewallshouldbefurredfirstandthensuitable
substrateappliedtofurring
–Concreteblockshouldbenewandunpainted,jointsstruckflush
Panels duRock®BrandCementBoard
–Glass-fiber-meshreinforcedaggregatedportlandcementpanel
–Improvedabuseresistance
–USG™PlasterBonderrequired
–RefertoproductsubmittalsheetCB399formoreinformation
FibeRock®BrandAbuse-ResistantInteriorPanels
–Outperformsregulargypsumbase,providingimprovedindentationandpenetrationresistance
–Economicalalternativetoconcreteblockconstruction
–Availableinmesh-backed5/89VHI(VeryHighImpact)version
–5/89panelcanbesubstitutedfor5/89impeRialBrandFiRecoDeCoreGypsumBaseandcertain1/29impeRialBrandFiRecoDe
CCoreGypsumBaseinwallassemblieswithoutcompromisingthefirerating(seeApplicationGuideSpecifications,Part
3.3.5)
–USGPlasterBonderrequired
–RefertoproductsubmittalsheetF218formoreinformation
impeRial®BrandGypsumBase
–Solidgypsumlathinlarge,drywall-sizedsheets,withbluefacepaper,designedforveneerplastersystems
–Inone-coatveneerapplications,onlyimpeRialandDiamonDFinishPlasterscanbeusedoverimpeRialBrand
GypsumBase
–impeRialBrandFiRecoDeGypsumBase,impeRialBrandFiRecoDeCCoreGypsumBase,impeRialBrandAbuse-Resistant
GypsumBaseorimpeRialBrandultRacoDe®CoreGypsumBasecanalsobeused
–RefertoproductsubmittalsheetP782formoreinformation
Monolithic MonolithicConcrete
–Plastercannotbeapplieddirectlytointeriorsurfaceofexteriorwall;thewallshouldbefurredfirstandthensuitable
substrateappliedtofurring
–USGPlasterBonderrequired
–Two-coatveneerrecommended
UnitMasonry
–Mayserveassubstrateforatwo-coatveneersystemoninteriorwalls
–Plastercannotbeapplieddirectlytointeriorsurfaceofexteriorwall;thewallshouldbefurredfirstandthensuitable
substrateappliedtofurring
–Concreteblockshouldbenewandunpainted,jointsstruckflush
11 USGPlasterSystems
Basecoat Plasters
Selector Conventional Veneer DiamonDBrandVeneerBasecoatPlaster •
impeRialBrandBasecoatPlaster •
ReD topBrandGypsumPlaster •
ReD topBrandWoodFiberPlaster •
StRucto-baSeGypsumPlaster •
StRucto-liteGypsumPlaster •
Basecoatplastersprovidestrengthandrigidity,buildingthewalltothicknesstoprovidesubstrateandbondforfinish
plaster.Theyareusedtoachieveeven,straightwallsandceilings,compensatingforsubstrateirregularities.Basecoat
plastersaregenerallyappliedinoneortwoapplicationsof1/29to19,dependingonthesubstrate.
diamond®BrandVeneerBasecoatPlaster
–QualitywallsandceilingsforresidentialorcommercialconstructionwherethesuperiorstrengthofimpeRial®Brand
BasecoatPlasterisnotessential
–Superiorworkabilityprovideseaseandspeedofapplicationtoachieveahighproductionratewithincreasedcoverage
–Exceptionalintegralbondwithallfinishplasters
–RefertoproductsubmittalsheetP774formoreinformation
impeRialBrandBasecoatPlaster
–High-strengthveneerbasecoatplaster(3,000psicompressivestrength)foruseintwo-coatapplications
–Canbeusedwithaveneerplasterfinish,suchasDiamonDBrandInteriorFinishorimpeRialBrandFinishPlaster
–Whereeaseofworkabilityandapplicationareamajorconcern,useReD top®BrandFinish,high-strengthStRucto-GauGe®
GaugingPlaster/limeputty,ReD topBrandKeenesCement/lime/sand-floatfinishorReD topBrandGauging/lime
puttyfinish
–RefertoproductsubmittalsheetP776formoreinformation
Red topBrandGypsumPlaster
–Generalpurposebasecoatplasteravailableindifferentformstosuitregionalpreferences
–Requiresaddingaggregateandwateronthejob
–RefertoproductsubmittalsheetP752formoreinformation
Red topBrandWoodFiberPlaster
–Agypsumplastercontainingfineparticlesofselectedwoodfiber
–Recommendedasascratchcoatformetallath,butcanbeusedonallstandardlathsandmasonry
–100lbs.ofsandper100lb.ofplastermustbeaddedwhenmachineappliedoruseddirectlyonmasonry
–Aggregateadditionisoptionalwhenappliedovermetallath
–RefertoproductsubmittalsheetP751formoreinformation
Components
12 USGPlasterSystems
StRucto-baSe®GypsumPlaster
–Developshigherstrengths(2,800psi)thanconventionalplasters
–Forsecuritywalls,handballcourts,hospitalcorridors,high-performancesuspendedceilingsystems,schoolsand
wherevertheultimatecompressivestrengthplasterisnecessary
–Requiresadditionofaggregate
–RefertoproductsubmittalsheetP753formoreinformation
StRucto-lite®GypsumPlaster
–Mill-mixed,perlite-aggregatedplasterrequiresonlytheadditionofwateronthejob
–Lessthanhalftheweightofasandedbasecoat,butprovidesthreetimestheinsulationvalue(k=1.74)
–Masonryforunitmasonryonly(highsuction)
–RefertoproductsubmittalsheetP754formoreinformation
Finish Plasters
Selector Conventional Veneer DiamonDBrandInteriorFinishPlaster • •
impeRialBrandFinishPlaster • •
ReD topBrandFinish • •a
ReD topBrandGaugingPlaster • •a
ReD topBrandKeenesCement • •a
StaR™andchampion®WhiteGaugingPlaster • •a
StRucto-GauGeGaugingPlaster • •a
Finishplastersareappliedtoproperlypreparedgypsumbasecoatplasterstoformthewearingsurfaceofwallsand
ceilings.Finishesareapproximately1/169to3/329thick,andcanbesmooth-troweled,floatedortextured.Finishplaster
isavailableintwotypes:factory-preparedfinishesrequireonlytheadditionofwater;thegaugingplasterandlime-type
finishesrequireblendingonthejobsite.
–Canbeappliedtoconventionalregularorhigh-strengthsandedbasecoatsforimprovedsurfacehardness
–Improvedsurfaceappearance,abrasionresistance,anddurabilitycomparedtodrywall
–Idealupgradeforbothresidentialandcommercialconstructionwithsmoothortexturedfinishes
Note (a)Maybeappliedoveranyveneerbasecoat,butcannotbeusedasaone-coatveneer.
1� USGPlasterSystems
PreparedFinish Mill-mixedfinishplastersthatrequireonlytheadditionofwateronthejobsite.Plasters
diamondBrandInteriorFinishPlaster
–Offersastrong,hard,whitesurfaceforcommercialorresidentialconstructionwheretheextrahardnessofimpeRialBrand
Finishisnotrequired
–Idealforapplicationsrequiringfastcompletionanddurability,andoftencompetitiveincostwithtapedandfinisheddrywall
–Suitableasasingle-coatfinishdirectlyonimpeRialBrandGypsumBaseoroverUSGPlasterBonderonmonolithic
concretewhenproperlyjobsanded;alsoasasecondcoatoverimpeRialBrandorDiamonDBrandVeneerBasecoatsora
sandedgypsumbasecoat
–Unaggregatedforsmoothorskiptrowelfinishes;maybejob-aggregatedwithuptoanequalpartbyweightofclean
silicasandforvarioustextures
–Canbeappliedinelectricalcableheatingsystemsifproperlyjob-sanded(seePM16)
–RefertoproductsubmittalsheetP777formoreinformation
impeRialBrandFinishPlaster
–Providesthehigheststrength(3,000psi)andthemostabrasion-resistantsurfaceofanyplasterfinish
–CanbeusedoverimpeRialBrandGypsumBaseinone-coatveneerplastersystems,overimpeRialBrandBasecoat
Plasterintwo-coatveneerplastersystems,asthefinishoverDiamonDBrandVeneerBasecoatorasthefinishina
two-coatveneerplastersystemoverDuRockBrandCementBoard
–Requiresonlytheadditionofcleanwater
–Notrecommendedforuseoverlightweightgypsumbasecoats
–RefertoproductsubmittalsheetP775formoreinformation
Red topBrandFinishPlaster
–Aneasy-workingmill-mixedgaugedplaster-limefinishforhighproductivity
–Excellentsmoothnessandtrowelingcharacteristics
–RefertoproductsubmittalsheetP773formoreinformation
PlasterFinishes AnyproperlypreparedconventionalplasterfinishmaybeappliedoverimpeRialBrandorDiamonDBrandVeneeroverVeneer Basecoat.Thissolutionoffershigherproductivity,easeofapplication,asmoothsurface,andawiderangeoftexturingBasecoats
options.Recommendedforlargecontinuoustexturedsurfacesorintegralcoloredfinishes.
GaugingPlasters
Speciallypreparedgypsumplastersdesignedtobemixedwithlimeputtytoproduceafinishplaster.Gaugingplasters
providepositivesetandstrengthtothefinishplaster.Theycanalsobeaggregatedfortexturing.
Red topBrandGaugingPlaster
–Agraytopinkplaster(dependingongypsumrocksource)
–AvailableinRegular(unaggregatedforsandedbasecoats)andQuality(withperliteorsandfines)forlightweightbasecoats
–RefertoproductsubmittalsheetP786formoreinformation
Components
14 USGPlasterSystems
Red topBrandKeenesCement
–Ahighlycalcined(“dead-burned”)gypsumgaugingplasterthatcanberetemperedonceduringapplication
–Idealforfloat-finishesandjobcoloring
–Extensivetrowelingnecessarytoattainstrength,surfacehardnessandimprovedresistancetoabrasion
–RefertoproductsubmittalsheetP770formoreinformation
StaRandchampionWhiteGaugingPlasters
–Whitegaugingplasterinquick-set(champion)andslow-set(StaR)formulations
–AvailableinRegular(unaggregatedforuseoversandedbasecoats)andQuality(aggregatedwithmill-mixedfine
aggregatesforuseoverlightweightbasecoats)
–RefertoproductsubmittalsheetP772formoreinformation
StRucto-GauGeGaugingPlaster
–Apremiumgaugingthatprovidesgreaterstrength,hardness,andresistancetosurfaceabrasionthanstandard
gaugingplasters
–Useonlyoverhigh-strengthbasecoats
–AvailableinQuick-SetandSlow-Setformulations
–RefertoproductsubmittalsheetP771formoreinformation
Finishing Limes
Whenfinishlimesaremixedwithwateronthejob,theresultislimeputty(acomponentoffinishplasters).Limeputty
addsplasticitytothefinishplaster,improvingworkabilityandsurfacesmoothness.
GRand pRizeSingleHydrateFinishLime
–Single-hydratelimerequiresovernightsoakingbeforeblendingwithgaugingplaster
ivoRyandSnowdRiFtFinishLimes
–Autoclaveddoublehydratelimevirtuallyeliminatespossiblefutureexpansioninthefinishcoatfromunhydrated
magnesiumoxides
–Noslakingrequired
Red topBrandKeenesCement
–Ahighlycalcined(“dead-burned”)gypsumgaugingplasterthatcanberetemperedonceduringapplication
–Idealforfloat-finishesandjobcoloring
–Extensivetrowelingnecessarytoattainstrength,surfacehardnessandimprovedresistancetoabrasion
–RefertoproductsubmittalsheetP770formoreinformation
StaRandchampionWhiteGaugingPlasters
–Whitegaugingplasterinquick-set(champion)andslow-set(StaR)formulations
–AvailableinRegular(unaggregatedforuseoversandedbasecoats)andQuality(aggregatedwithmill-mixedfine
aggregatesforuseoverlightweightbasecoats)
–RefertoproductsubmittalsheetP772formoreinformation
StRucto-GauGeGaugingPlaster
–Apremiumgaugingthatprovidesgreaterstrength,hardness,andresistancetosurfaceabrasionthanstandard
gaugingplasters
–Useonlyoverhigh-strengthbasecoats
–AvailableinQuick-SetandSlow-Setformulations
–RefertoproductsubmittalsheetP771formoreinformation
Finishing Limes
Whenfinishlimesaremixedwithwateronthejob,theresultislimeputty(acomponentoffinishplasters).Limeputty
addsplasticitytothefinishplaster,improvingworkabilityandsurfacesmoothness.
GRand pRizeSingleHydrateFinishLime
–Single-hydratelimerequiresovernightsoakingbeforeblendingwithgaugingplaster
ivoRyandSnowdRiFtFinishLimes
–Autoclaveddoublehydratelimevirtuallyeliminatespossiblefutureexpansioninthefinishcoatfromunhydrated
magnesiumoxides
–Noslakingrequired
15 USGPlasterSystems
Special Interior Plasters
USGAcousticalPlasterFinish
–Attractivesprayplastertextureforapplicationtogypsumbasecoats,interiormonolithicconcrete,metaldecksand
gypsumpanelceilings
–Foruseonnewconstructionorrenovation,noncontactsurfaces
–Surfaceburningcharacteristics:flamespread10,smokedeveloped25
–SoundratedNRC0.55forconcreteandconventionalplasterat1/29finishthickness;NRC0.75forconcreteand
conventionalplasterat19finishthickness;NRC0.50forgypsumpanels
–RefertoproductsubmittalsheetP720formoreinformation
USGMouldingPlaster
–Finelygroundforexcellentdetailreproductioninspecializedworksuchascastornamentalenrichmentsand
runningcornices
–Controlledsetforaccuratereproduction
–Availableinwhiteorgray
WhitehydRocal®GypsumCement
–Providesexceptionalstrengthforproducingornamentationwithdurablefinedetail
–Recommendedforthincastingsandthosemadefromintricatelatexmolds
–RefertoproductsubmittalsheetIC338formoreinformation
USG Accessories
SheetRockBrandZincControlJoint,No.09�
–Relievesveneerplastersystemexpansion/contractionstressesinlargeceilingareas
–Usedfromfloortoceilingorfromheadertoceilinginlongpartitionruns
–Plastictapeisremovedafterplasteringtokeepjointclear
–Roll-formedfromcorrosion-resistantzinc
–Grounds:3/329;length:108
SheetRockBrandMetalTrims
–Protectedgesofveneerplasterfinishatcasedopeningsandintersectionsofwallsandceilings
–Fine-meshexpandedflangesreinforceappliedveneerplaster
–Availableinsizesforusewith1/29and5/89impeRialBrandGypsumBase
–RefertoproductsubmittalsheetP760formoreinformation
–No.801provides1/169groundsforone-coatveneerplastersystems
–No.701provides3/329groundsfortwo-coatveneerplastersystems
1/4”
13/4”
3/32”
7/16”
11/4”
1/2” or 5/8”
11/4”
1/2” or 5/8”
Special Interior Plasters
USGAcousticalPlasterFinish
–Attractivesprayplastertextureforapplicationtogypsumbasecoats,interiormonolithicconcrete,metaldecksand
gypsumpanelceilings
–Foruseonnewconstructionorrenovation,noncontactsurfaces
–Surfaceburningcharacteristics:flamespread10,smokedeveloped25
–SoundratedNRC0.55forconcreteandconventionalplasterat1/29finishthickness;NRC0.75forconcreteand
conventionalplasterat19finishthickness;NRC0.50forgypsumpanels
–RefertoproductsubmittalsheetP720formoreinformation
USGMouldingPlaster
–Finelygroundforexcellentdetailreproductioninspecializedworksuchascastornamentalenrichmentsand
runningcornices
–Controlledsetforaccuratereproduction
–Availableinwhiteorgray
WhitehydRocal®GypsumCement
–Providesexceptionalstrengthforproducingornamentationwithdurablefinedetail
–Recommendedforthincastingsandthosemadefromintricatelatexmolds
–RefertoproductsubmittalsheetIC338formoreinformation
USG Accessories
SheetRockBrandZincControlJoint,No.09�
–Relievesveneerplastersystemexpansion/contractionstressesinlargeceilingareas
–Usedfromfloortoceilingorfromheadertoceilinginlongpartitionruns
–Plastictapeisremovedafterplasteringtokeepjointclear
–Roll-formedfromcorrosion-resistantzinc
–Grounds:3/329;length:108
SheetRock®BrandMetalTrims
–Protectedgesofveneerplasterfinishatcasedopeningsandintersectionsofwallsandceilings
–Fine-meshexpandedflangesreinforceappliedveneerplaster
–Availableinsizesforusewith1/29and5/89impeRialBrandGypsumBase
–RefertoproductsubmittalsheetP760formoreinformation
–No.801provides1/169groundsforone-coatveneerplastersystems
–No.701provides3/329groundsfortwo-coatveneerplastersystems
USGDecorativeInteriorFinishSealer
–Water-based100%acrylicemulsionusedtosealoutmoisturewhileallowingthefinishtobreatheintheUSGDecorative
InteriorFinishSystem
–Ready-to-useproductalsoprovidesUVandabrasionresistance
SheetRock®BrandJointTape
–Strong,cross-fiberedpapertape,foruseonlywithSheetRockeaSy SanDLightweightandDuRabonDSetting-TypeJoint
Compounds
–Forusage,seeVeneerPlasterSystemsLimitationsintheApplicationGuideSpecificationssection
SheetRockBrandduRabondSetting-TypeandeaSy SandLightweightSetting-TypeJointCompounds
–Setting-typecompoundsforusewithSheetRockBrandJointTapeincertainveneerplastersystems(seeVeneerPlaster
SystemsLimitationsintheApplicationGuideSpecificationssection)
–RefertoproductsubmittalsheetsJ17AandJ621formoreinformation
USGPlasterBonder
–Bondsnewplastertoanystructurallysoundinteriorsurface
–RequiredforapplicationsofplasteroverDuRockBrandCementBoardandmonolithicconcrete
–RefertoproductsubmittalsheetP778formoreinformation
impeRialBrandTape
–Highlycrack-resistantglassfibertape
–DesignedtoreinforcejointsofimpeRialBrandGypsumBaseoverwoodframingonly
–Openweaveallowsforcompleteencasementduringembedding
–Availableinpressuresensitive(P)andstaple-attached(S)
–RefertoproductsubmittalsheetP618formoreinformation
FramingandFurringAccessoriesandScrews
–RefertoproductsubmittalsheetP519formoreinformation
SheetRockBrandZincControlJointsNos.50,�5,100
–Relieveplasterexpansion/contractionstressinlargeareas
–Usedfromfloortoceilinginlongpartitionruns,andfromheadertoceilingabovedoorframes
–Plastictape,removedafterplastering,protectsa1/4”x1/2”deepslot
–Roll-formedfromzinc;corrosion-resistantforbothinteriorandexteriorusewithgypsumorportlandcementplaster
–Sizes,ground:No.100,1”(forexteriorstuccocurtainwalls)
SheetRock®BrandJointTape
–Strong,cross-fiberedpapertape,foruseonlywithSheetRockeaSy SanD™LightweightandDuRabonD®Setting-TypeJoint
Compounds
–Forusage,seeVeneerPlasterSystemsLimitationsintheApplicationGuideSpecificationssection
SheetRockBrandduRabondSetting-TypeandeaSy SandLightweightSetting-TypeJointCompounds
–Setting-typecompoundsforusewithSheetRockBrandJointTapeincertainveneerplastersystems(seeVeneerPlaster
SystemsLimitationsintheApplicationGuideSpecificationssection)
–RefertoproductsubmittalsheetsJ17AandJ621formoreinformation
USGDecorativeInteriorFinishSealer
–Water-based100%acrylicemulsionusedtosealoutmoisturewhileallowingthefinishtobreatheintheUSGDecorative
InteriorFinishSystem
–Ready-to-useproductalsoprovidesUVandabrasionresistance
USGPlasterBonder
–Bondsnewplastertoanystructurallysoundinteriorsurface
–RequiredforapplicationsofplasteroverDuRockBrandCementBoardandmonolithicconcrete
–RefertoproductsubmittalsheetP778formoreinformation
impeRialBrandTape
–Highlycrack-resistantglassfibertape
–DesignedtoreinforcejointsofimpeRialBrandGypsumBaseoverwoodframingonly
–Openweaveallowsforcompleteencasementduringembedding
–Availableinpressuresensitive(P)andstaple-attached(S)
–RefertoproductsubmittalsheetP618formoreinformation
FramingandFurringAccessoriesandScrews
–RefertoproductsubmittalsheetP519formoreinformation
Components
1� USGPlasterSystems
1/2”, 3/4”, 1”7/8”
1/4”
Other Accessories and Trims
Lathaccessoriesareattachedtosubstratestoestablishfinisheddimensions.Beadsandtrimsestablishproper
plasterthickness(grounds)toreinforcecornersandintersections,toactasterminusforplasterapplicationandtoserve
ascontroljointsinlargeexpansesofwallsandceilings.TheselathaccessoriesarenotsuppliedbyUSG.
CornerBeads
–Easilynailedorstapled
–1-1/4expandedmeshflangesprovidesuperiorplasterkeyforcrackresistance
–No.800provides1/169groundsforone-coatveneerplastersystems
–No.900provides3/329groundsfortwo-coatveneerplastersystems
1-AExpandedCornerBead
–Protectscornersfromdamage,andestablishesastraightlineatthecorner
–Easilyflexedforirregularcorners
–Madewith2-7/89wideexpandedflanges
–Availableingalvanizedsteelandzincalloy(forexterioruse)
–RefertoproductsubmittalsheetP760-2formoreinformation
Double-XCornerBead
–Idealforstructuraltileandtoughmasonry
–Adjustseasilyforplasterdepthoncolumns
–Perforatedstiffeningribsalongexpandedflange
4-AFlexibleCornerBead
–Idealforcurvededges(archways,telephoneniches,etc.)
–Versatileandeconomicalasan“all-purpose”cornerbead
–Snippingflangesallowsbeadtobebenttoanycurvatureradius
Cornerite
–Stripsofpaintedorgalvanizedsteeldiamondmeshlathforreinforcement
–Bentinthecentertoa100°angle,reinforcesinterioranglesbetweenunlappedmetallathandbetweenmasonry
constructions(toreduceplastercracking)andnonferrouslath
Striplath
–Flatstripforreinforcingjointsofnonmetallicand/ordissimilarplasterlathing/bases
–Alsospanspipechases
DoubleVExpansionJoint
–Providesstressrelieftocontrolcrackinginlargeplasteredareas
–Madewithexpandedflangesofcorrosion-resistantgalvanizedsteel,orzincforexterioruse
–Grounds:1/29,3/49;length:108
1� USGPlasterSystems
1/2",or3/4"
43/8"
27/8”
1/8”
27/8”
1/8”
11/2”
1/8”
4”, 6”
2” or 3”
11/4”
1/8”
CasingBeads
–Use3/49casingbeadswithmetallath,5/89beadswithallmasonryunits
–WhenflangeisappliedunderRocklathBrandPlasterBase,use7/89beads;overRocklathBrandPlasterBase,1/29beads
–Madefromcorrosion-resistantgalvanizedsteelorzincalloyforexteriorapplications
SheetRockBrandZincControlJointsNos.50,�5,100
–Relieveplasterexpansion/contractionstressinlargeareas
–Usedfromfloortoceilinginlongpartitionruns,andfromheadertoceilingabovedoorframes
–Plastictape,removedafterplastering,protectsa1/4”x1/2”deepslot
–Roll-formedfromzinc;corrosion-resistantforbothinteriorandexteriorusewithgypsumorportlandcementplaster
–Sizes,ground:No.100,1”(forexteriorstuccocurtainwalls)
Cold-RolledChannels
–16gaugesteel
–Usedforfurring,suspendedceilings,partitions,andornamentallathing
–Availablegalvanizedorblackasphaltumpainted
Z-FurringChannels
–Usedtomechanicallyattachmineralwoolandrigidfoaminsulationsandgypsumbasetointeriorsurfacesofmonolithic
concreteandmasonrywalls
–Alsoforattachinginsulationandgypsumbasetointeriorsofexistingwallsandceilings
–Corrosion-resistantsteel
AdjustableWallFurringBrackets
–Usedinbracedfurringsystemsforinteriororexteriormasonrywalls
–Madeof20gaugegalvanizedsteel,andattachedtosteelstuds
–Furringdepth:upto2-1/49plusstudwidth
MetalFurringChannelClip
–Usedtoattachmetalfurringchannelsto1-1/29cold-rolledchannelceilinggrillwork
–Galvanized
CasingBeads
–Use3/49casingbeadswithmetallath,5/89beadswithallmasonryunits
–WhenflangeisappliedunderRocklathBrandPlasterBase,use7/89beads;overRocklathBrandPlasterBase,1/29beads
–Madefromcorrosion-resistantgalvanizedsteelorzincalloyforexteriorapplications
Cold-RolledChannels
–16gaugesteel
–Usedforfurring,suspendedceilings,partitions,andornamentallathing
–Availablegalvanizedorblackasphaltumpainted
Z-FurringChannels
–Usedtomechanicallyattachmineralwoolandrigidfoaminsulationsandgypsumbasetointeriorsurfacesofmonolithic
concreteandmasonrywalls
–Alsoforattachinginsulationandgypsumbasetointeriorsofexistingwallsandceilings
–Corrosion-resistantsteel
AdjustableWallFurringBrackets
–Usedinbracedfurringsystemsforinteriororexteriormasonrywalls
–Madeof20gaugegalvanizedsteel,andattachedtosteelstuds
–Furringdepth:upto2-1/49plusstudwidth
MetalFurringChannelClip
–Usedtoattachmetalfurringchannelsto1-1/29cold-rolledchannelceilinggrillwork
–Galvanized
18 USGPlasterSystems
Components
1"
3"
7/8"
1,11/2",2",3"
11/4"
31/8"
1/4"
1/4",3/8",1/2",5/8",3/4",7/8",1",11/4",
11/4"
1/4"
1/4",3/8",1/2",3/4",7/8",
3/4"
1/2"approx.
11/2",2"
17/32"approx.
Product Data
19 USGPlasterSystems
Compatibility SuitableSubstratesforConventionalBasecoatsSelectors Substrate Basecoats
StRucto- StRucto- Red top Red top
liteGyp. baSeGyp. Gypsum Wood Plaster Plaster Plaster Fiber
Rocklath • • • • CMUBlock • • • • MonolithConcretea • • • • MLCH-FMG • • • • MLC-Studs •
SuitableFinishesforBasecoats Basecoat FinishPlasters Red top StRucto- Keenes/ Gauging impeRial diamond
Finish GauGe/ Lime/ Lime/ Finish Interior Plaster Lime Sand Sand Plaster Finish
ReD topGypsumPlaster • • • • • ReD topWoodFiberb • • • • • • StRucto-liteGypsumPlaster • • StRucto-baSeGypsumPlasterb • • •c • • •
SuitableSubstratesforVeneerPlasterSystems Substrate Basecoats FinishPlasters diamond impeRial impeRial diamond Red top StRucto- Gauging/ Keenes Veneer Veneer Finish Interior Finish GauGe Lime Lime/ Basecoat Basecoat Plaster Finish Lime Sand
impeRialGypsumBase • • • • DuRock CementBoarda,d • • FibeRock aR Panelsa,d • • MonolithicConcrete a,d • • CMUBlock • • BondedSurface • • SpecifiedUSGBasecoatedSurface • • • • • •
MetalLathSelector TypeofLath RecommendedApplications Ornamental Overinterior Overexterior Nail-on/tie-on Solid Concrete contour substrate substratee flatceiling partitions centering
DiamondMesh • •g •i
Self-Furring • •f •h
FlatRiblath •
3/89Riblath • •
Notes (a)USGPlasterBondermustfirstbeapplied.(b)Jobsanded.(c)Qualitygauging,notovermetallath.MonolithicconcretetobetreatedwithUSGPlasterBonder.(d)
Whenjobaddingsand,refertoproductsubmittalsheet.(e)Forexample:gypsumsheathing,replasteringexistingwork,columnfireproofing.(f)3.4lb/sq.yd.galva-nizedlath.(g)Fortie-ononly:supports169o.c.max.(h)Fornail-ononly:supports169o.c.max.(i)Supports169o.c.max.
20 USGPlasterSystems
Product Data
Compatibility VeneerPlasterSystemsOverimpeRialBrandGypsumBaseSelectors BasecoatPlaster(overmetallath) Scratchcoat Browncoat 1.StRucto-baSePlaster,sanded100lbs.:2cu.ft. StRucto-baSePlaster,sanded100lbs.:3cu.ft.
2.WoodFiber,neat,orsandedupto100lbs.:1cu.ft. WoodFiberPlaster,sandedupto100lbs.:1cu.ft.
3.WoodFiber,neat,orsandedupto100lbs.:1cu.ft. ReD topGypsumPlaster,sanded100lbs.:2cu.ft.
4.ReD topGypsumPlaster,sanded100lbs.:2cu.ft. ReD topGypsumPlaster,sanded100lbs.:3cu.ft.
5.WoodFiber,neat,orsandedupto100lbs.:1cu.ft. StRucto-litePlaster(Sandfloatfinishonly)
6.WoodFiber,neat,orsanded100lbs.:1cu.ft. ReD topGypsumPlaster,perlited100lbs.:2cu.ft.(sandfloatfinishonly)
CoverageRates BasecoatPlastersa
Ratio:Aggregate Approx.CoverageperTonofGypsumBasecoat b
(vol.)Basecoat(wt.) GypsumLath MetalLath UnitMasonry Plasterproduct Mix cu.ft./ cu.m./ sq.yd./ sq.m./ sq.yd./ sq.m./ sq.yd./ sq.m./ 100lbs ton ton tonc ton tonc ton tonc
StRucto-lite regular — — 140 129 89d 82d 109 100
GypsumPlaster
ReD top Brand neat — — 85 78 54 49 66 60
WoodFiberPlaster sand 1.0 0.62 135 124 86 79 105 97
StRucto-baSe sand 2.0 1.24 154 142 99 91 120 110
GypsumPlaster sand 2.5 1.55 185 170 118 109 144 132
sand 3.0 1.86 214 197 136 125 167 154
ReD top Brand sand 2.0 1.24 180 165 114 104 140 129
GypsumPlaster sand 2.5 1.55 206 190 131 121 160 147
sand 3.0 1.86 232 213 148 136 181 167
perlite 2.0 1.24 176 162 112 103 137 126
perlite 3.0 1.86 224 206 143 132 174 160
vermiculite 2.0 1.24 171 157 109 100 133 123
vermiculite 3.0 1.86 215 198 137 126 168 154
impeRialBrandBasecoatandFinish Product sq.ft./ton Masonry sq.m./ton(metric)e Masonry GypsumBase GypsumBase impeRialBrandBasecoat 3250-4250 2700-3600 335-435 275-370
DiamonDBrandBasecoat 4000-5000 3500-4500 410-510 360-460
impeRialBrand(1-coat)Finish 3500-4000 Notrecommended 360-410 Notrecommended
impeRialBrand(2-coat)Finish 3200-3600 3200-3600 330-370 330-370
diamondBrandInterioranddiamondBrandInteriorTypeFFinishPlaster SubstrateSurface SandFloatFinish HeavyTextureFinish Sanded1:2(sand:DIF)f Sanded1:1f
sq.ft./ton sq.m./tong sq.ft./ton sq.m./tong sq.ft./ton sq.m./tong
impeRialGypsumBase 6000 610 4660 475 3500 355
impeRialorDiamonDBasecoat 5500 560 4330 440 3250 330
SandedReD top Basecoat 5000 510 4000 410 3000 305
Monolithicconcreteh,i 5500 560 4660 475 3500 355
Veneerbasecoatover monolithicconcreteh 5500 560 4330 440 3250 330
Notes (a)Coveragevaluesbasedonlaboratorydetermineddrydensities.Actualcoveragemayvaryduetojobconditions.(b)Grounds(includingfinishcoat):gypsumlath–
1/29(faceoflath),metallath–3/49(backoflath),unitmasonry—5/89.(c)Metricton.(d)Lightweightaggregateplastersarenotrecommendedovermetallathwhenthefinishcoatistobesmoothtroweled.(e)Coverageroundedtonearest5sq.m.permetricton.(f)Coveragebasedononetonofaggregatedmixture(combinedweightofsandandDiamonDBrand(finish).(g)Coverageroundedtonearest5sq.m.permetricton.(h)USGPlasterBonderrequired.(i)Mustbejobsanded,minimum1/2:1,sandtoplaster.
21 USGPlasterSystems
CoverageRates GaugingPlasters Product FinishTexture GaugingtoLime, Approx.Coverage toSand(drywt.) perTon(sq.yds.)a
StRucto-GauGeandLimeFinish smoothtrowel-extremelyhardsurface 100lbs.gauging 380
100lbs.lime
smoothtrowel-hardsurface 100lbs.gauging 430
200lbs.lime
KeenesCementandLimeFinish smoothtrowel 100lbs.Keenes 370
100lbs.lime
KeenesCementandLimeFinish smoothtrowel 100lbs.Keenes 430
200lbs.lime
KeenesCement, floatfinish 100lbs.Keenes 270
LimeandSandFinish 200lbs.lime
400-800lbs.sandb
ReD top, StaR orchampion smoothtrowel 50lbs.gauging 390 GaugingPlasterandLimeFinish 100lbs.lime
ReD top, StaR orchampion floatfinish 50lbs.gauging 280
GaugingPlaster,Lime 100lbs.lime
andSandFinish 400lbs.sandc
CoverageRates UseofAggregateswithGypsumPlastersMaximumRecommendedProportions MaximumAggregateQuantity,cu.ft.,tobeusedwith100lb.ofNeatGypsumPlaster Undersmoothtrowelfinishes Undertexturefinishes Sandd Perlitee Sandd Perlitee
Plaster No.of Typeof cu.ft./ cu.m/ton cu.ft./ cu.m./ton cu.ft./ cu.m/ton cu.ft./ cum./ton Base Coats Coats 100lb 100lb 100lb 100lb gypsumlath 3 scratch 2 1.24 2 1.24 2 1.24 2 1.24
brown 3 1.86 2 1.24 3 1.86 3f 1.86f
2 basecoat 2.5 1.55 2 1.24 2.5 1.55 2 1.24
metallath 3 scratch 2 1.24 — — 2 1.24 2 1.24
brown 3 1.86 — — 3 1.86 2 1.24
unitmasonry 3 scratch 3 1.86 3 1.86 3 1.86 3 1.86
brown 3 1.86 3 1.86 3 1.86 3 1.86
2 basecoat 3 1.86 3 1.86 3 1.86 3 1.86
Notes (a)1⁄169thick.(b)Forimprovedhardness,KeenesCementcanincreasetoa2:2:6,ortoamax.2:1:6mixture.Note:asKeenesCementproportionincreases, workabilityandfinishingbecomemoredifficult.(c)Mixtureswithlessormoresand(1:2:1to1:2:8)areacceptable,butcoveragewillvary.(d)Approximatelysix
No.2shovelsofsandequal1cu.ft.(0.028m3).(e)Inaconstructionwithmetallathastheplasterbase,perliteorvermiculiteaggregateisnotrecommendedforuseinthebasecoatplaster,unlessafloatfinishisused.(f)Quantityrecommendedonlyifplasterisapplied19thick;otherwiseuse2cu.ft.
22 USGPlasterSystems
Product Data
SpacingSpecifications MaximumFrameSpacing—MetalLatha MaximumAllowableSpacing Vertical MetalSolid Othersc Horizontal Metal Supports Partitions Supports Typeof Weight (Wall) (Ceiling) Lathb lbs./ kg./ Wood WoodorConcrete
sq.yd sq.m. in. mm in. mm in. mm in. mm in. mm DiamondMesh 2.5 1.4 16 406 16 406 12 305 —e — —e —
DiamonDMeshd 3.4 1.8 16 406 16 406 16 406 16 406 13.5 343
1/89Z-Rib 2.75 1.5 16 406 16 406 16 406 16 406 12 305
1/89Z-Rib 3.4 1.8 19 483 24 610 19 483 19 483 19 483
3/89Rib 3.4 1.8 24 610 — — 24 610 24 610 24 610
3/89Rib 4.0 2.2 24 610 — — 24 610 24 610 24 610
FrameandFastenerSpacing–RocklathPlasterBase TypeFraming BaseThickness Fastenerf Max.FrameSpacing Max.FastenerSpacing
in. mm in. mm in. mm
Wood 3/8 9.5 Nails–13ga.1-1/89long,19/649flathead,blued. 16 406 5g 127
Staples—16ga.galv.flattenedwire,flatcrown
7/169wide,19divergentlegs
SteelStud 3/8 9.5 19drywallscrews 16 406 12h 305
MetalFurring 3/8 9.5 19drywallscrews 16 406 12h 305
MaximumSpacing–MainRunner–CarryingChannels MainRunner Maximumc.toc.Spacing MaximumSpacingof ChannelSize ofMainRunners HangersAlongRunners
in. mm ft. mm ft. mm
3/4 19.1 3 914 2 610
3/4 19.1 2-1/4 686 3i 914
1-1/2 38.1 4 1219 3 914
1-1/2 38.1 3-1/2 1067 3-1/2 1067
1-1/2 38.1 3 914 4 1219
2 50.8 4 1219 5 1524
2 50.8 2-1/2 762 6 1829
2 50.8 2 610 7 2134
MaximumSpacing–Cross-FurringMembers Maximumc.toc. MainRunner Spacingof orSupport Cross-furring Spacing
Cross-furringsize in. mm ft. mm
3/49(19.1mm)C.R.Channel 24 610 3 914
3/49(19.1mm)C.R.Channel 19 483 3-1/2 1067
3/49(19.1mm)C.R.Channel 16 406 4 1219
19(25.4mm)H.R.Channel 24 610 4 1219
19(25.4mm)H.R.Channel 19 483 4-1/2 1372
19(25.4mm)H.R.Channel 12 305 5 1524
3/89(9.5mm)PencilRodj 19 483 2 610
3/89(9.5mm)PencilRodj 12 305 2-1/2 762
Notes(a)Forspacingonfire-ratedconstructions,seetestreports.(b)Alltypesmadefromcopperalloysteelcontainingfrom0.20%to0.25%purecopper,andpaintedwithrust-inhibitiveblackasphaltumpaint.Sheetsizeis279x969.(c)Includingverticalfurring.(d)Availableinbothcopperalloyandgalvanizedsteel.(e)Notrecommendedexceptforfireproofingofsteelshapes.(f)Metric;fastenerdimensions:19/649=7.5mm:3/89=11.1mm:19=25.4mm:1-1/89=28.6mm:1-1/49=31.(g)Topreventedgedamage,fastenatleast3/89fromedgesandendsofwoodstuds.(h)Spacetype Sscrews29fromedgeoflath.(i)Forconcretejoistconstructiononly—where8ga.wiremaybeinsertedinjoistbeforeconcreteispoured.(j)Primaryusageisonfurredceilingmembers.
2� USGPlasterSystems
SupportArea–Hangersa TypicalCeilingAreaperHanger HangerSizeandType sq.ft. sq.m. MaximumTensileLoad(lbs.)b
9ga.galvanizedwire 12.5 1.2 340
8ga.galvanizedwire 16.0 1.5 408
3/169(4.8mm)mildsteelrodc 20.0 1.9 546
1/49(6.4mm)mildsteelrodc 22.5 2.1 972
3/169x19(4.8mmx25.4mm)mildsteelflatc 25.0 2.3 3712
MaximumFrameSpacingd BaseandFinish SteelFramingSpacing WoodFramingSpacing Assembly in. mm in. mm 1/29impeRialBrandGypsumBase onelayer,1-coatsystem 16 406.4 16 406.4
onelayer,2-coatsystem 24 609.6 24b 609.6e
twolayers,1-&2-coatsystem 24 609.6 24 609.6
5/89impeRialBrandGypsumBase onelayer,1-coatsystem 24 609.6 24e 609.6e
onelayer,2-coatsystem 24 609.6 24e 609.6e
twolayers,1-&2-coatsystem 24 609.6 24 609.6
�/49impeRialBrandGypsumBase onelayer,1-coatsystem 24e 609.6e 24e 609.6e
onelayer,2-coatsystem 24 609.6 24 609.6
twolayer,1-&2-coatsystem 24 609.6 24 609.6
1/29duRockBrandCementBoard onelayer,2-coatsystemf 16 406.4 16 406.4
twolayer,2-coatsystemf 16 406.4 16 406.4
MaximumFastenerSpacingg AssemblyDescription TypeofFastener Location MaximumSpacing in. mm singlelayer,woodframeandfacelayer Ann.RingNailsh ceilingsandwalls 7 178
ofdoublelayerassembly 8 203
1-1/49TypeWScrews ceilingsandwalls 12 305
singlelayer,resilientchannel,steelframe 19type SScrewsi ceilingsandwalls 12 305
baselayerofdoublelayerconstruction Ann.RingNailshor1-1/49 ceilingsandwalls 24 610
TypeWScrews
Notes(a)Thesearetypicalproperties.Refertomanufacturer’sspecifications.(b)Basedonminimumyield33,000psi.(c)Whereseveremoistureconditionsmayoccur,rodsgalvanizedorpaintedwithrust-inhibitivepaint,orgalvanizedstrapsarerecommended.(d)Forperpendicularorparallelapplication—perpendicularpreferredformaximumstrength;parallelapplicationnotrecommendedforceilings.Forfire-ratedconstruction,seetestreport.(e)249spacingonwoodframingandallsteel-framedapplicationsrequirejointtreatmentwithSheetRockBrandSetting-TypeCompoundandSheetRockBrandJointTape.(f)AllDuRockBrandCementBoardveneerplastersystemsrequirejointtreatmentwithSheetRockBrandJointTapeandSheetRockBrandSetting-TypeJointCompound(DuRabonDoreaSy SanD)andapplicationofUSGPlasterBonder.(g)Fornon-fireratedassemblies,selectfastenersforfire-ratedconstructionfromtestreportorfromtableinSA100.(h)Forannularringnails,selectlengthtoprovide3/49penetrationintowoodframing.(i)Screwsforsteelframingshouldbeatleast1/29longerthanthenominalbasethickness.
24 USGPlasterSystems
Performance Testing
Combining compatible basecoat and finish plasters with the appropriate substrate is an important factor in developing sufficient surface strength and resistance to abuse and cracking.
Both basecoat and finish plasters can be used in conjunction with a variety of base panels. When selecting a plaster system, it is important to take into account abuse resistance, acoustics and aesthetics.
PerformanceTests USGPlasterSystemsresultfromaprogramofextensivetestingandcontinuousimprovements,backedbyover100
yearsofexperienceinthebuildingmaterialsindustry.
TestingMethods AllUSGproductsandsystemsundergoexhaustivetestingtoensurethattheymeetexactingstandards.
Independenttestingofabuse-resistantassembliesisperformedbyH.P.WhiteLaboratory,Inc.,aballisticresearch
anddevelopmentfacilitythatalsoconductsforcedentryanddroptesting.H.P.WhiteLaboratorydevelopedthefirstset
ofcomprehensivetestproceduresandstandardsfortheevaluationofthephysicalsecurityofstructuresandstructural
subassemblies.Althoughoriginallydesignedforgovernmentandmilitaryorganizations,theseprocedureshaveevolved
toincludecommercialapplicationssuchasbanks,currencyexchangesandprisons.
ProductsaremanufacturedandtestedinaccordancewithASTMstandards.ASTMInternationalisoneofthelargest
voluntarystandardsdevelopmentorganizationsintheworld,andisatrustedsourcefortechnicalstandardsformaterials,
products,systems,andservices.
Standards Plasters Compliance ASTMC28 ASTMC�1 ASTMC20� ASTMC20� ASTMC58� ASTMC�5
TypeS TypeN
ReD topKeenesCement •
championGaugingPlaster •
ReD topGaugingPlaster •
StaRGaugingPlaster •
StRucto-GauGeGaugingPlaster •
GRanD pRizeLime •
ivoRyFinishLime •
SnowDRiFtFinishLime •
DiamonDInteriorFinishPlaster •
impeRialFinishPlaster •
ReD topFinish •
ReD topGypsumPlaster •
ReD topWoodFiberPlaster •
StRucto-baSeGypsumPlaster •
StRucto-liteGypsumPlaster • •
USGMouldingPlaster •
Note (a)2,800psicompressivestrengthwhentestedinaccordancewithASTMC472andsanded200lbs.ofsandto100lbs.ofStRucto-baSeGypsumPlaster.
25 USGPlasterSystems
Standards SubstratesCompliance ASTMC�� ASTMC588 ASTME84 ASTME119a ASTME1�� ASTMC12�8 FibeRock BrandARPanels • •b •
impeRial BrandGypsumBase • • • •
Rocklath bRanD FiRecoDe PlasterBase • • • •
FixtureAttachmentLoadTable FastenerType Size BaseAssembly AllowableWithdrawal AllowableShear Resistance Resistance in. mm lbs. Nc lbs. Nc
toggleboltorhollowwallfastener 1/8 3.18 1/29gypsumbase 20 89 40 178
3/16 4.76 30 134 50 223
1/4 6.35 40 178 60 267
1/8 3.18 1/29gypsumbaseand25ga. 70 312 100 445
3/16 4.76 steelstud 80 356 125 556
1/4 6.35 155 690 175 779
No.8sheetmetalscrew 1/29gypsumbaseand25ga. 50 223 80 356
typeSbugleheadscrew steelstudor25ga.steelinsert 60 267 100 445
typeS-12bugleheadscrew 1/29gypsumbaseand20ga. 85 378 135 601 steelstudor20ga.steelinsert
3/89typeSpanheadscrew 25ga.steelto25ga.steel 70 312 120 534
twoboltsweldedtosteelinsert 3/16 4.76 grabbarattachment 175 779 200 890
1/4 6.35 200 890 250 1113
boltweldedto1-1⁄29chan. 1/4 6.35 plumber’sbracket 200 890 250 1113
DimensionalStability HygrometricCoefficientofExpansion ThermalCoefficientofExpansion (unrestrained) (unrestrained) [Inches/inch/%R.H.(5%–90%R.H.)] [inches/inch/F°(40-100°F)] StRucto-litePlaster(regular) 4.8x10–6 7.3x10–6
SandedGypsumPlaster(100:2,100:3) 1.5x10–6 7.0x10–6
WoodFiberPlaster(sanded100:1) 2.8x10–6 8.0x10–6
GypsumLath 7.2x10–6 9.0x10–6
VermiculiteGypsumPlaster(100:2) 3.8x10–6 —
BasecoatPlasters Ratio:Aggregate(vol.) Approximate Weight Conductivity Basecoat(wt.) CompressiveStrengthDryd
PlasterProduct Mix cu.ft./100lb cu.m./ton psi kg/sq.cm. pcf–dry (k) StRucto-litePlaster regular — — 700 49 50 1.74
ReD topWoodFiber neat — — 1750 123 82 3.15
Plaster sand 1.0 0.62 1400 98 97 —
StRucto-baSePlaster sand 2.0 1.24 2800 197 124 —
sand 2.5 1.55 1900 134 120 —
sand 3.0 1.86 1400 98 118 —
ReD topGypsum sand 2.0 1.24 875 62 107 5.51
Plaster sand 2.5 1.55 750 53 108 —
sand 3.0 1.86 650 46 109 5.60
perlite 2.0 1.24 700 49 48 1.64
perlite 3.0 1.86 525 37 41 1.31
vermiculite 2.0 1.24 465 33 48 1.74
vermiculite 3.0 1.86 290 20 41 1.42
Note (a)Whentestedaspartofanassembly.(b)5/89thickpanel.(c)Newtons.(d)AveragelaboratoryresultswhentestedinaccordancewithASTMC472.Figuresmayvary
slightlyforproductsfromindividualplants.
2� USGPlasterSystems
Performance Selector
Steel FramedPartitions
1HourFire-ratedConstruction Non-loadbearing AcousticalPerformance Reference
ConstructionDetail Description TestNumber STC TestNumber ARL Index
wt.6 •5/89impeRialBrandFiRecoDeCoreGypsum ULDesU419 SA700 1
47⁄8"
BaseorimpeRialBrandFiRecoDeCoreAbuse- orU4�5 SA920 ResistantGypsumBaseorFibeRockBrand Panels –3-5/8925gaugesteelstuds249o.c. •optionalveneerplaster
wt.6 •veneerplasteronly(notdrywall)1/29impeRial GA-WP-1240 SA920 2
35⁄8" BrandFiRecoDeCCoreGypsumBaseandveneer
finishor5/89FibeRockBrandPanels –2-1/2925gaugesteelstuds,169o.c. –jointsstaggeredandtaped –1/169veneerfinish
wt.6 •5/89impeRial BrandFiRecoDeCoreGypsum ULDesU404 SA920 �
45⁄8"
Baseoneside SA934 –3-1/2920gaugesteelstuds169o.c. • 1/29DuRockBrandCementBoardotherside –39theRmaFibeRSAFB •USGPlasterBonderovercementboardand
treatedjoints •jointstreatedwithUSGsetting-typejointcom-
poundandpapertape •DiamonDBrandveneerbasecoatwithimpeRial
Brandfinishplaster
wt.6 •5/89DuRockBrandCementBoardor5/89 ULDesU40� SA920 4
43⁄4"
impeRialBrandFiRecoDeCoreGypsumBase SA934 –3-1/2920gaugestuds,169o.c. –39theRmaFibeR SAFB •USGPlasterBonderoveruntreatedjointareas •jointstreatedwithUSGsetting-typejointcompound
andpapertape •USGPlasterBonderovercementboardand
treatedjoints •DiamonDBrandveneerbasecoatwithveneeror
conventionalfinish
wt.7 •1/29impeRialBrandFiRecoDeCCoreGypsum ULDesU419 SA920 5
4"
Panels orU448 –2-1/2925gaugesteelstuds249o.c. –1-1/29theRmaFibeRSAFB –jointsfinished •optionalveneerfinish
wt.5 •1/29impeRialBrandFiRecoDeCCore ULDesU419 SA920 �
51⁄8"
GypsumBase orU451 –3-5/8925gaugesteelstuds249o.c. –39theRmaFibeRSAFB –RC-1channelorequivalentonesidespaced
249o.c. •optionalveneerplaster
40 USG-8�0808
49 SA-8�0�1� Basedon39SAFBincavity
51 RAL-TL-90-1�� Basedon5/89FiRecoDeCCorepanelsand
39SAFB,andveneerfinishsurfaceSAFB259wide,creasedtofitcavity
41 RAL-TL-�9-148 Basedonsameconstruction withouttheRmaFibeRSAFB
50 SA-800504
50 RAL-TL-8�-15�
54 RAL-TL-8�-21� Basedon5/89thickpanels
2� USGPlasterSystems
Steel FramedPartitions
56 RAL-TL-8�-1�9
56 RAL-TL-84-141 Basedon5/89thickSheetRock
BrandFiRecoDe CCoreGypsumPanels
37 NBS-52�F45
58 RAL-TL-8�-215
59 RAL-TL-84-140 6920gaugestructuralstudsand 59theRmaFibeRSAFB
50 USG-84081� Basedon3-5/89studassembly
withoutmineralwoolbatt
52 SA-8�09�2 Basedonlamin.facelayer,1-1/29
mineralwoolbattand2-1/29studs
54 CK-�54-40 Basedon2-1/29studs,screw- attachedfacelayerand1-1/29 mineralwoolbatt
55 SA-800421 Basedon3-5/89studsand 1-1/29mineralwoolbatt
1HourFire-ratedConstruction Non-loadbearing AcousticalPerformance Reference
ConstructionDetail Description TestNumber STC TestNumber ARL Index
clg.wt.5 •1/29impeRialBrandFiRecoDeCCoreGypsum ULDesU419 SA920 �
71⁄2"
Base orU451 –6920gaugesteelstuds249o.c. –59theRmaFibeR SaFb –RC-1chanorequivonesidespaced249o.c. •optionalveneerplaster
wt.18 –29solidmetallathandplaster OSU-T-129 SA920 8
2" –3/49coldrolledchannel169o.c.
–2.5lb.metallathwire-tiedtochannel •100:2-100:2gypsumsandplaster
41⁄4"
•3/89RocklathBrandFiRecoDeCorePlasterBase ULDesU488 SA920 9 –2-1/2920gaugesteelstuds169o.c. –19theRmaFibeR SAFB •7/169plasterbasecoat,1/169plasterfinishcoat
1-1/2HourFire-ratedConstruction
wt.7 •1/29impeRialBrandFiRecoDeCCore ULDesU452 SA920 10
55⁄8"
GypsumBase –3-5/8920gaugestuds249o.c. –39theRmaFibeR SAFB –RC-1channelorequivalentonesidespaced249o.c. –2layersgypsumpanels –facelayerjointsfinished •optionalveneerplaster
2HourFire-ratedConstruction
wt.11 •5/89impeRial BrandFiRecoDeCoreGypsum ULDesU404 SA920 11
6"
Baseoneside SA700 •1/29or5/89DuRock BrandCementBoard –3-1/2920gaugesteelstuds169o.c. –39theRmaFibeRSAFB •USGPlasterBonderoverCementBoardand
treatedjoints •facelayerjointstreatedwithUSGsetting-type
jointcompoundandpapertape •optionalveneerplaster
wt.9 •1/29impeRialBrandFiRecoDeCCoreGypsum ULDesU419 SA920 12
35⁄8"
Baseeachside orU412 –1-5/8925gaugesteelstuds249o.c. –facelayerjointsfinished •optionalveneerplaster
28 USGPlasterSystems
Performance Selector
Steel FramedPartitions
2HourFire-ratedConstruction Non-loadbearing AcousticalPerformance Reference
ConstructionDetail Description TestNumber STC TestNumber ARL Index
wt.11 •5/89impeRialBrandFiRecoDeCoreGypsum ULDesU419 SA920 1�
5"
Base,orFibeRockBrandPanels orU411 –1-5/8925gaugesteelstuds249o.c. –facelayerjointsfinished •optionalveneerplaster
wt.7 •1/29impeRialBrandFiRecoDeCCoreGypsum ULDesU419 SA920 14
55⁄8"
Base orU45� –3-5/8920gaugestuds249o.c. –39theRmaFibeRSAFB –RC-1channelorequivalentonesidespaced
249o.c. –single-layergypsumpanelsscrew-attached
tostuds –doublelayerscrew-attachedtochannel –facelayerjointsfinished •optionalveneerplaster
wt.9 •1/29impeRialBrandFiRecoDeCCoreGypsum ULDesU454 SA920 15
5"
Base –2-1/2925gaugesteelstuds249o.c. –19theRmaFibeRSAFB –RC-1channelorequivalentoneside,spaced 249o.c. –doublelayergypsumpanelsscrew-attached tochannel,2layersscrew-attachedtosteel studs –facelayerjointsfinished •optionalveneerplaster
wt.21 •3/89RocklathBrandFiRecoDeCorePlasterBase ULDesU484 SA920 1�
43⁄4"
–2-1/2920gaugestuds169o.c. –3.4lb.self-furringdiamondmeshmetallath •3/49gypsum-sandplaster
wt.45 •StRuctocoRe18gaugesteelpanelsattachedto ULDesU4�� SA1119 1�
4"
18gaugesteelperimeterangles SA920 •3/49minimumcoverageStRucto-baSeGypsum SA929 Plastersandedat2:1byweightintwocoats • impeRialBrandFinishPlasterapplied1/169thick
�HourFire-ratedConstruction
wt.13 •1/29impeRialBrandFiRecoDeCCoreGypsum ULDesU419 SA920 18
45⁄8"
Base orU4�5 –1-5/8925gaugesteelstuds249o.c. •optionalveneerplaster
48 BBN-��0408 Basedon3-5/89studsand
5/89SheetRockBrandFiRecoDeCCoreGypsumPanels
56 USG-840818 Basedon3-5/89studsand 39mineralwoolbatt
59 RAL-TL-84-1�� Basedon5/89thickpanels,6920gauge
structuralstuds,59mineralwoolbatt
60 RAL-TL-8�-140 Basedon1/29thickpanels,6920gauge
structuralstuds,59mineralwoolbatt
57 USG-8�120� Basedon5/89thickpanels
60 RAL-TL-8�-154
61 RAL-TL-8�-214 Basedon5/89thickpanels
63 RAL-TL-8�-141 Basedon6920gaugestructuralstuds
and59mineralwoolbatt
62 RAL-TL-84-1�9 Basedon5/89thickpanels,
6920gaugestructuralstudsand59mineralwoolbatt
29 USGPlasterSystems
Steel FramedPartitions
2HourFire-ratedConstruction Non-loadbearing AcousticalPerformance Reference
ConstructionDetail Description TestNumber STC TestNumber ARL Index
61 RAL-TL-8�-15� Basedon5/89thickpanels
62 RAL-TL-8�-21� Basedon5/89thickpanels
63 RAL-TL-84-1�8 Basedon5/89thickpanels, 6920gaugestructuralstudsand 59theRmaFibeRSAFB
64 RAL-TL-8�-142 Basedon6920gaugestructuralstudsand59theRmaFibeRSAFB
65 RAL-TL-84-150 Basedon5/89thickpanels,6920gauge
structuralstuds,59theRmaFibeRSAFB,acousticalsealantbeadbetweenpanelsandstuds,dabs89o.c.betweenpanellayersonstudside
62 SA-8�011� Basedonassemblywith1-1/29 mineralwoolbattincavity
52 RAL-TL-��-155 Basedon3-1/29insulationoneside
40 USG-810519
41 USG-810518 Basedon29mineralwoolbattincavity
wt.11 •1/29impeRialBrandFiRecoDeCCoreGypsum ULDesU419 SA920 19
65⁄8"
Base orU455 –3-5/8920gaugestuds249o.c. –39theRmaFibeRSAFB –RC-1channelorequivalentoneside,spaced
249o.c. –facelayerjointsfinished
wt.55 •StRuctocoRe18gaugesteelpanelsattachedto ULDesU4�� SA1119 20
5"
18gaugesteelperimeterangles SA920 •StRucto-baSeGypsumPlastersandedat2:1by SA929 weightintwocoats • impeRialBrandFinishPlasterapplied1/169thick
4HourFire-ratedConstruction
wt.17 •4layers1/29impeRialBrandFiRecoDeCCore ULDesU419 SA920 21
55⁄8"
GypsumBase,eachside orU4�5 –1-5/8925gaugesteelstuds249o.c. •optionalveneerplaster
1HourFire-ratedConstruction ChaseWalls
wt.6 •5/89impeRialBrandFiRecoDeCoreGypsum ULDesU420 SA920 22
103⁄4"
Base,eachsideorFibeRockBrandPanels –1-5/8925gaugesteelstuds249o.c.in2rows –5/89gypsumpanelgussetsorsteelrunner bracesspanningchasescrew-attachedtostuds •optionalveneerplaster
1HourFire-ratedConstruction Loadbearing
wt.6 •5/89impeRialBrandFiRecoDeCoreGypsum ULDesU42� SA920 2�
43⁄4"
BaseorFibeRockBrandPanels orU425 SA700 –3-1/2920gaugesteelstructuralstuds249o.c. •optionalveneerplaster
�0 USGPlasterSystems
Performance Selector
Steel FramedPartitions
1HourFire-ratedConstruction Loadbearing AcousticalPerformance Reference
ConstructionDetail Description TestNumber STC TestNumber ARL Index
51 SA-840�15 Basedon3-1/2916gastruc studsandlateralbracing
61 SA-8�0�28 Basedon3-1/2916gastruc
studs,5/89thickpanels,lateralbracingand39mineralwoolbatt
wt.9 •1/29impeRialBrandFiRecoDeCCoreGypsum ULDesU42� SA920 24
6"
Base orU440 –3-1/2920gaugesteelstructuralstuds249o.c. –RC-1channelorequivalentoneside,spaced
249o.c. –facelayerjointsfinished •optionalveneerplaster
wt.7 •5/89impeRial BrandFiRecoDeCoreGypsum ULDesU404 SA920 25
45⁄8"
Baseoneside SA934 –3-1/2920gaugesteelstructuralstuds169o.c. • 1/29DuRockBrandCementBoard –39theRmaFibeRSAFB •USGPlasterBonderovercementboardand
treatedjoints •jointstreatedwithUSGsetting-typejoint
compoundandpapertape •DiamonDBrandveneerbasecoatwithimpeRial
Brandfinish
wt.7 •5/89DuRockBrandCementBoardorimpeRial ULDesU40� SA920 2�
43⁄4"
BrandFiRecoDeCoreGypsumBase SA934 –3-1/2920gaugesteelstructuralstuds169o.c. –39mineralwoolbatt •USGPlasterBonderoveruntreatedjointareas •jointstreatedwithUSGsetting-typejoint
compoundandpapertape •USGPlasterBonderovercementboardand
treatedjoints •DiamonDBrandveneerbasecoatwithveneeror
conventionalfinish
�HourFire-ratedConstruction
wt.17 •1/29SheetRockBrandGypsumFiRecoDeCCore ULDesU42� SA920 2�
71⁄2"
Panels,eachside –3-1/2920gaugesteelstructuralstuds249o.c. –facelayerjointsfinished •ratingalsoapplieswithimpeRialBrandFiRecoDeC
CoreGypsumBaseandveneerfinishsurface – load-bearing up to 100% allowable stud axial load
�1 USGPlasterSystems
Wood FramedPartitions
1HourFire-ratedConstruction Loadbearing AcousticalPerformance Reference
ConstructionDetail Description TestNumber STC TestNumber ARL Index
34 USG-�0-FT-G&H Basedon169studspacing andscrews69o.c.
37 USG-8�080� Basedon249studspacing
46 BBN-�00�25 Basedon249studspacing and39mineralwoolbatt
52 USG-810218 Basedonsameassembly(non-firerated)
withRC-1channelandwithoutmineralwoolbatt
58 USG-810219 BasedonsameassemblywithRC-1 channeland29mineralwoolbatt
wt.7 •1/29impeRialBrandFiRecoDeCCoreGypsum UofC SA920 28 Base,veneerfinishonly(notdrywall) 10-2�-�4 –2x4stud169o.c. –jointsfinished •1/169veneerfinish
wt.7 •5/89impeRialBrandFiRecoDeCoreGypsum ULDesU�05, SA920 29 BaseorFibeRockBrandPanels U�14 –2x4woodstud169or249o.c. –jointsfinished –optionalveneerplaster
•3/89RocklathBase GA-WP-�4�0 SA920 �0 –2x4woodstud169o.c. •1/291:2gypsum-sandplaster
2HourFire-ratedConstruction
wt.12 •5/89impeRialBrandFiRecoDeCoreGypsum ULDesU�01 SA920 �1 BaseorSheetRockBrandWater-Resistant FiRecoDeCoreGypsumPanelsorFibeRock BrandPanels –2x4woodstuds169o.c. –jointsfinished •optionalveneerplaster
1HourFire-ratedConstruction ChaseWalls
•5/89impeRialBrandFiRecoDeCCore ULDesU�40 SA920 �2 GypsumBase –2x4staggeredwoodstud249o.c.on2x6
commonplate –jointsfinished •optionalveneerplaster
63⁄8"
6"
51⁄4"
43⁄4"
45⁄8"
�2 USGPlasterSystems
Performance Selector
Furred PartitionsPartitions
�HourFire-ratedConstruction AcousticalPerformance Reference
ConstructionDetail Description TestNumber STC TestNumber ARL Index
•1/29impeRialBrandFiRecoDeCCoreGypsum ULDesU914 SA920 �� Base –concreteblock(ULClassified) –7/89deepmetfurchan249o.c. –jointsfinished •optionalveneerfinish
4HourFire-ratedConstruction
•1/29impeRialBrandFiRecoDeCCoreGypsum ULDesU910 SA920 �4
101⁄2" 75⁄8"min.
Base – concreteblock(ULClassified) –7/89deepmetalfurchannel249o.c. – jointsfinished •optionalveneerfinish
91⁄8"75⁄8"min.
�� USGPlasterSystems
Steel FramedFloor/Ceilings
1HourFire-ratedConstruction SteelBarJoistFraming AcousticalPerformance Reference
ConstructionDetail Description TestNumber STC TestNumber ARL Index
clg.wt.4 •5/89ReD topBrandGypsumPlaster,sanded GA-FC-1180 SA920 �5 1:2-1:3 –3/89riblathmetallath –29concreteonriblathoverjoist –steelbarjoists249o.c.
2HourFire-ratedConstruction
clg.wt.4 •Alternatebasedon5/89ReD topBrandGypsum GA-FC-21�0 SA920 �� PlasterVermiculiteor7/89ReD topWoodFiber Plaster –3/89riblathmetallath –29concreteonriblathoverjoist –steelbarjoists,249o.c.
clg.wt.3 •1/29or5/89impeRialBrandFiRecoDeCCore ULDesG515 SA920 �� GypsumBase –metalfurringchannel249o.c.
–jointsfinished –2-1/29concreteonriblathorcorrugated steeldeck –steelbarjoists •optionalveneerplaster
–3.4#diamondmeshlathand5/89100:2-100:3 BMS-92 SA920 �8 gypsum-sandplaster –3/49coldrolledchannelfurredorsuspended –2-1/29concreteonriblathor28gauge corrugatedsteeldeck –steelbarjoist
2-1/2HourFire-ratedConstruction
–3.4#diamondmeshlathand3/49100:1-100:1 ULReport SA920 �9
141⁄8"
gypsumwoodfiber-sandplaster R5429-1 –3/49coldrolledchannelfurredorsuspended –2-1/29concreteonriblathor28gauge corrugatedsteeldeck –steelbarjoists
�HourFire-ratedConstruction
clg.wt.3,clg.wt.4 •5/89impeRialBrandFiRecoDeCCore ULDesG512 SA920 40 GypsumBase –metalfurchannel249o.c.
–jointsfinished –2-1/29concreteoncorrugatedsteeldeck orriblath
–steelbarjoists,249o.c. •optionalveneerplaster
16"
14"
137⁄8"
145⁄8"
145⁄8"
54* ASTME1414 *CACvalueperASTME1414test procedureforhorizontallyadjacent spaces
�4 USGPlasterSystems
Performance Selector
Steel FramedFloor/Ceilings
�HourFire-ratedConstruction SteelBarJoistFraming AcousticalPerformance Reference
ConstructionDetail Description TestNumber STC TestNumber ARL Index
clg.wt.4 –3/49coldrolledchannelfurredorsuspended BMS-92 SA920 41 –3.4#diamondmeshmetallath –7/89neatwoodfibergypsumplaster –2-1/29concreteonriblathor28gauge corrugatedsteeldeck –steelbarjoist
clg.wt.4 •Alternatebasedon5/891:2-1:3ReD top GA-FC-�140 SA920 42 GypsumPlaster-Vermiculiteor7/89ReD top WoodFiberPlasterneat
4HourFire-ratedConstruction
clg.wt.5 –3/49coldrolledchannelfurredorsuspended BMS-92 SA920 4� •7/891:2-1:3ReD topGypsumPlaster-Vermiculite –3/89riblathmetallath –2-1/29concreteonriblath –steelbarjoists,249o.c.153⁄8"
141⁄4"
14"
�5 USGPlasterSystems
Wood FramedFloor/Ceilings
1HourFire-ratedConstruction DimensionalLumber AcousticalPerformance Reference
ConstructionDetail Description TestNumber STC IIC TestNumber ARL Index
clg.wt.3 •5/89impeRialBrandFiRecoDeCore ULDesL501 SA305 44 GypsumBase,ceiling SA920 –19nominalwoodsubandfinishedfloor –2x10woodjoist169o.c. –jointsfinished •optionallevelRockBrandFloorUnderlayment • optionalSRM-25orSRBsoundmat •optionalveneerplaster
clg.wt.3 •1/29or5/89impeRialBrandFiRecoDeCCore ULDesL512 SA305 45 GypsumBase,ceiling SA920 –19nominalwoodsubandfinishedfloor –2x10woodjoist169o.c. –jointsfinished •optional3/49levelRockBrandFloorUnderlayment •optionalSRM-25orSRBsoundmat •optionalveneerplaster
clg.wt.3 •1/29or5/89impeRialBrandFiRecoDeCCore ULDesL514 SA920 4� GypsumBase –19nominalwoodsubandfinishedfloor –2x10woodjoist169o.c. –RC-1channelorequivalentspaced249o.c. –jointsfinished •optionalveneerplaster
clg.wt.3 •5/89impeRialBrandFiRecoDeCCoreGypsum ULDesL51� 4� Base –1-5/89perlite-sandconcrete –plywoodsubfloor –2x10woodjoists169o.c. –RC-1channelorequivalent –jointsfinished •optionalveneerplaster
clg.wt.4 •2layers1/29impeRialBrandFiRecoDeCCore ULDesL510 Assemblynotrecommended SA920 48 GypsumBase whensoundcontrolisamajor –19nominalwoodsubandfinishedfloor consideration. –2x10woodjoist169o.c. –RC-1channelorequivalent –jointsfinished •optionalveneerplaster
131⁄2"
125⁄8"
38 32 CK-�412-� Basedon1-1/49nominalwood floor
39 56 CK-�412-8
Basedon1-1/49nominalwoodfloor,44ozcarpetand40ozpadatopflooring
59 USG�40�04 SA920 Based39mineralwoolbatt,
3/49gypsumconcreteand1/29SheetRockBrandFiRecoDeCCoreGypsumPanels
47 USG�40�0� Basedon39mineralwool
bat,vinyltileatopflooring
65 USG�40�05 Basedon39mineralwool
batt,44oz.carpetand40oz.padatopflooring
�� USGPlasterSystems
Performance Selector
Wood FramedFloor/Ceilings
1HourFire-ratedConstruction DimensionalLumber AcousticalPerformance Reference
ConstructionDetail Description TestNumber STC TestNumber ARL Index
clg.wt.4 •5/891:2ReD topGypsumPlaster-perliteover GA-FC-54�0 SA920 49 3/89typeXRocklathPlasterBase –19nominalT&Gsubandfinishfloor –2x10woodjoists169o.c. •optionalveneerplaster
clg.wt.4 •1/291:2sandedReD topGypsumPlasterover GA-FC-5490 SA920 50 3/89typeXRocklathPlasterBase –19nominalT&Gsubandfinishfloor –2x10joists169o.c.
clg.wt.4 •5/891:2-1:3sandedReD topGypsumPlaster GA-FC-5510 SA920 51 over3.4#diamondlath –19nominalT&Gsubandfinishfloor –29x109woodjoists169o.c.
2HourFire-ratedConstruction EngineeredJoist
clg.wt.8 •baselayer:5/89impeRialBrandFiRecoDeC ULDesL5�8 SA920 52 CoreGypsumBase –RC-1channelorequivalent •Doublefacelayer:5/89SheetRockBrand FiRecoDeCCoreGypsumPanels –9-1/29woodtrussjoists249o.c. –jointsfinished –Floor:5/89T&Gplywood •optional3/49levelRockBrandFloorUnderlayment •optionalveneerplaster
1HourFire-ratedConstruction Truss
clg.wt.5 •2layers1/29impeRialBrandFiRecoDeCCore ULDesL542 SA920 5� GypsumBase –jointsfinished –23/329plywood –129parallelchordwoodfloortruss,249o.c. •optionalveneerplaster133⁄4"
121⁄2"
111⁄4"
111⁄4"
111⁄4"
�� USGPlasterSystems
Wood FramedFloor/Ceilings
1HourFire-ratedConstruction DimensionalLumber AcousticalPerformance Reference
ConstructionDetail Description TestNumber STC TestNumber ARL Index
clg.wt.3 •5/89impeRialBrandFiRecoDeCCoreGypsum ULDesL528 SA920 54 Base –woodtruss,249o.c. –3/49plywoodfloor –metalfurchannel249o.c. –jointsfinished •optionalveneerplaster RC-1 Resilient Channel or equivalent may be used in place of metal furring channel
clg.wt.3 •5/89impeRialBrandFiRecoDeCCoreGypsum ULDesL529 SC2000 55 Base SA920 –woodtruss,249o.c. –3/49plywoodfloor •USGDGLDrywallSuspensionSystem –jointsfinished •optional3/49levelRockBrandFloor Underlayment •optionalveneerplaster
207⁄8"
141⁄4"
�8 USGPlasterSystems
Performance Selector
Steel FramedRoof/Ceilings
1-1/2HourFire-ratedConstruction SteelBarJoistFraming AcousticalPerformance Reference
ConstructionDetail Description TestNumber STC TestNumber ARL Index
clg.wt.4 •USGDGLDrywallSuspensionSystem ULDesP510 SA920 5� •5/89impeRialBrandFiRecoDeCCore GypsumBase –jointsfinished –min19roofinsuland5/89gypsumboardon steeldeck •1hr.ratingbasedonassemblywith 1/29SheetRockBrandFiRecoDeCCore GypsumPanels –steelbarjoists •optionalveneerplaster
271⁄4"
�9 USGPlasterSystems
ColumnStructural Fireproofing
1HourFire-ratedConstruction Reference
ConstructionDetail Description TestNumber Comments ARL Index
–3.4#self-furringdiamondmeshmetallath BMS-92 Structuralmembertested: SA920 5� wrappedaroundcolumn W10x49 •3/49100:2-100:3gypsum-sandplaster
2HourFire-ratedConstruction•
•1/29impeRialBrandFiRecoDeCCoreGypsum ULDesX521 Structuralmembertested: SA920 58 Base W14x228 –1-5/8925gaugesteelstudsatcolumncorners –jointsfinished •optionalveneerplaster
•1/29impeRialBrandFiRecoDeCCoreGypsum ULDesX518 Structuralmembertested: SA920 59 Base W10x49 –doublelayerovereachflangeend –1-5/8925gaugesteelstud –jointsfinished •optionalveneerplaster
•1/29impeRialBrandFiRecoDeCCoreGypsum ULDesX524 Varies SA920 �0 Base Ratingalsoappliestotaperedorconstant- –1-5/8925gaugesteelstuds sectionprefabricatedmetalbuildingcolumns –jointsfinished •optionalveneerplaster
–3.4#self-furringdiamondmeshmetallath ULDesX402 Structuralmembertested: SA920 �1 wrappedaroundcolumn W10x49 •19100:2-100:3gypsum-perliteplasteror StRucto-liteBrandPlaster –perliteaggregatebearingULLabel
�HourFire-ratedConstruction•
•1/29impeRialBrandFiRecoDeCCoreGypsum ULDesX514 Structuralmembertested: SA920 �2 Base W14x228 –1-5/8925gaugesteelstudsatcolcorners –jointsfinished •optionalveneerplaster
•1/29impeRialBrandFiRecoDeCCoreGypsum ULDesX515 Structuralmembertested: SA920 �� Base W10x49 –1-5/8925gaugesteelstuds –jointsfinished •optionalveneerplaster
31⁄8"
11⁄2"
21⁄8"
1"
1"
11⁄2" 31⁄8"
25⁄8"
1"
1⁄2"
21⁄8"
3⁄4"
40 USGPlasterSystems
Performance Selector
ColumnStructural Fireproofing
�HourFire-ratedConstruction Reference
ConstructionDetail Description TestNumber Comments ARL Index
–3.4#self-furringdiamondmeshmetallath ULDesX402 Structuralmembertested: SA920 �4 wrappedaroundcolumn W10x49 •1-3/89includesscratchcoat2cu.ft.perlite per100lbs.ofReD topGypsumPlaster;brown coat3cu.ft.perliteper100lbs.ofReD top
GypsumPlaster
4HourFire-ratedConstruction
–3.4#diamondmeshmetalfurred1/29from ULDesX405 Structuralmembertested: SA920 �5 faceofcolumn W10x49 •1-7/89includesscratchcoat2cu.ft.perlite per100lbs.ofReD topGypsumPlaster;brown coat2cu.ft.perliteper100lbs.ofReD top
GypsumPlaster –perliteaggregatebearingULLabel
–3.4#self-furringdiamondmeshmetallath ULDesX402 Structuralmembertested: SA920 �� •1-3/49includesscratchcoat2cu.ft.perlite W10x49 per100lbs.ofReD topGypsumPlaster;brown coat3cu.ft.perliteper100lbs.ofReD top
GypsumPlaster –perliteaggregatebearingULLabel
13⁄4"
21⁄2"
1"
41 USGPlasterSystems
BeamStructural Fireproofing
�HourFire-ratedConstruction Reference
ConstructionDetail Description TestNumber Comments ARL Index
17⁄8" 17⁄8"
37⁄8"
4"
23⁄4"
23⁄4"
•5/89SheetRockBrandFiRecoDeCoreGypsum ULDesN501, Structuralmembertested: SA920 �� Panels N502 W8x24(beamonly) –1-5/89steelrunchannelbrackets249o.c. –1-3/89x7/89corneranglesattachedtochannel brackets –jointsfinished –2-1/29concretedeckonflutedsteelfloor •optionalveneerplaster
�HourFire-ratedConstruction
–1-5/89steelrunchannelbrackets249o.c. ULDesN505 Structuralmembertested: SA920 �8 –7/89x1-3/89corneranglesatttobrackets W8x24(beamonly) •5/89impeRialBrandFiRecoDeCoreGypsum Fireratingforrestrainedassembly;2hrrating Base forunrestrainedassembly –1920gaugehexmeshonbottomovermiddle layer –jointsfinished –2-1/29concretedeckonflutedsteelfloor
4HourFire-ratedConstruction
–3.4#self-furringdiamondmeshmetallath ULDesD40� Structuralmembertested: SA920 �9 enclosingbeam W12x58 •1-1/29of2cu.ft.perliteper100lbs.ReD top Suitableforprotectionofbeamsandgirders GypsumPlaster
grout
trowelcutatframeedges
jambanchor
Jamb
20ga.steelstuds–seegooddesignpractices
grout
Jamb(standarddoor)
steelstudboltedorscrewattachedtoeachjambanchor
3-pieceknockdownsteelframe
Jamb(standarddoor)
steelstud
42 USGPlasterSystems
Design Details
cornerite
finishedceiling
Ceilingattachment
Floorattachment
Perimeterreliefceilingintersection
TopsetWood
1/2"gypsumplaster
3/8"ROCKLATH
plasterbase
1"drywallscrew
1"drywallscrew
no.66expandedflangecasingbead
2"approx.
1/2"
1/2"
1/2"min.fordeflection
7/8"
SHEETROCKBrandacousticalsealant
SHEETROCKBrandacousticalsealant
steelstuds
locatejambanchorsasrequired–onstrikesidetooccurdirectlyoppositehingeside
runnerfastenedwithscrewstostuds
flooranchorssecuredwithminimumoftwofasteners
cripplestud1/2"min.clearance
Note:SeeUSGtechnicalliteratureforreinforcingrequirementsofdoorsover50lb.andupto200lb.
Steeldoorframe
Elevation
Conventional Plaster Systems
CeilingAttachment SteelDoorFrame
Jambs–StandardDoors
4� USGPlasterSystems
WallIntersection–ControlJoint–PartitionIntersection
JambAnchors
Wallintersection Controljoint
Partitionintersection
sealant
sealant
SHEETROCKBrandzinccontroljointno.50
no.66shortflangecasingbead
cornerite(stapled)
partitionextendedtoreducesoundflanking
3/8"ROCKLATH
1/2"gypsumplaster
2"min.6"max.
2"min.6"max.
no.4-Aflexiblecornerbead
SHEETROCKBrandacousticalsealant
studwidth
3/4"min.
3/4"min.
framefaceminus3/16"
jambdepthminus3/16"
1/2"min.5/8"max.
studwidth
Jambanchors(furnishedwithframe)
3/4"min.
3/4"min.
framefaceminus3/16"
Conventional Plaster Systems
44 USGPlasterSystems
Design Details
Veneer Plaster Systems
WallPlan CeilingAttachment
PlasterChalkboard PerimeterRelief–CeilingIntersection PerimeterReliefandControlJoint
SHEETROCKBrandacousticalsealant
doublelayer(laminated)IMPERIALBrandgypsumbase
SHEETROCKBrand701-Ametaltrim
steelstud
steelrunner
IMPERIALBrandgypsumbase
veneerfinish
Floorattachment
Ceilingattachment
701-Ametaltrim
701-Ametaltrim
steelstud16"o.c.
chalktroughsecuredtosteelstudwithTYPESscrews
chalkboardpaintonIMPERIALBrandfinishplaster
sealant
1/2"IMPERIALBrandgypsumbaseattachedtostudswithTYPESscrews
Plasterchalkboard
SHEETROCKBrandacousticalsealant
3/8"
21/2"
1/2"
screw
steelstud
steelrunner
IMPERIALBrandgypsumbase
veneerfinish
Perimeterreliefceilingintersection
SHEETROCKBrand701-Bmetaltrim
SHEETROCKBrandzinccontroljointno.093
4"max.
Perimeterreliefandcontroljointwallorcolumnintersection
3/8"
SHEETROCKBrandacousticalsealant
SHEETROCKBrandacousticalsealant
gypsumbasejoint
1"drywallscrew
SHEETROCKBrandno.800orno.900cornerbead
SHEETROCKBrand701-AorBmetaltrim
steelstud steelstud
Partitioncorner
Wallplansections
Intersection
2"min.6"max. SHEETROCKBrand
jointtapecornerreinforcement
Partitioncorner Intersection
Wallorcolumnintersecion
45 USGPlasterSystems
WallPlanSections
CeilingAttachment
adjustablebracket
SHEETROCKBrandno.800orno.900cornerbead
SHEETROCKBrandzinccontroljountno.093
SHEETROCKBrandjointtape
mineralfiberinsulation
steelstud
2"max.
steelstudsingle-layerIMPERIAL
Brandgypsumbase
double-layer(laminated)IMPERIALBrandgypsumbase
double-layerIMPERIALBrandgypsumbase
IntersectionPartitionterminal Outletbox Wallcontroljoint
Wallplansections
SHEETROCKBrandacousticalsealant
SHEETROCKBrandacousticalsealant
1/2"min.
RC-1resilientchannelorequivalentspaced16"or24"o.c.andatceilings
SHEETROCKBrandacousticalsealant
SHEETROCKBrandacousticalsealant
SHEETROCKBrandjointtape
1/2"
RC-1resilientchannelorequivalent(maybeinvertedtoeaseattachmentofbase)
Ceilingattachment
Floorattachment
IMPERIALBrandgypsumbase
veneerfinish
THERMAFIBERSAFB
2x4woodstud
resilientchannel
resilientchannel
SHEETROCKBrandacousticalsealant
SHEETROCKBrandacousticalsealant
SHEETROCKBrandjointtape
1/2"
RC-1resilientchannelorequivalent(maybeinvertedtoeaseattachmentofbase)
Ceilingattachment
Floorattachment
IMPERIALBrandgypsumbase
veneerfinish
THERMAFBERSAFB
2x4woodstud
Partitionterminal Outletbox Wallcontroljoint Intersection
Floorattachment Floorattachment
Veneer Plaster Systems
4� USGPlasterSystems
Design Details
Veneer Plaster Systems
SteelDoorFrames–Elevation SteelDoorFrame
JambAnchors–FurnishedwithFrame
steelstuds
locatejambanchorsasrequired–onstrikesidetooccurdirectlyoppositehingeside
runnerfastenedwithscrewstostuds
flooranchorssecuredwithminimumoftwofasteners
cripplestud1/2"min.clearance
Note:SeeUSGtechnicalliteratureforreinforcingrequirementsofdoorsover50lb.andupto200lb.
Steeldoorframe
Elevation
studwidth
3/4"min.
3/4"min.
framefaceminus3/16"
jambdepthminus3/16"
1/2"min.5/8"max.
studwidth
Jambanchors(furnishedwithframe)
3/4"min.
3/4"min.
framefaceminus3/16"
woodstuds
3-pieceknockdownsteelframe
Steeldoorframe
woodstuds
wooddoorframe
Wooddoorframe
WoodDoorFrame
4� USGPlasterSystems
CeilingAttachment
GrillageSuspension WallIntersection ControlJoint
SHEETROCKBrandjointtreatment
11/2"channel
IMPERIALBrandgypsumbase
drywallscrew
hanger
metalfurringchannelclip
metalfurringchannel
vinyltrim
wiretie
Grillagesuspension Wallintersection
7/8"
zinccontroljointno.093
wiretie
23/4"
veneerfinish
backblockforfire-ratedceilings
Controljoint
RC-1resilientchannelorequivalentspaced16"or24"o.c.andatceilings
SHEETROCKBrandacousticalsealant
SHEETROCKBrandacousticalsealant
SHEETROCKBrandjointtape
1/2"
RC-1resilientchannelorequivalent(maybeinvertedtoeaseattachmentofbase)
Ceilingattachment
Floorattachment
IMPERIALBrandgypsumbase
veneerfinish
THERMAFIBERSAFB
2x4woodstud
Note:Ifpartywall,extendboardflushtoceiling
extrachannelrequiredforcabinetsover24"high
11/4"typeWscrew
1/2"IMPERIALBrandgypsumbase
centerhangersoverRC-1resilientchannelorequivalent
1"typeSscrew
2x2woodsoffitframe
SHEETROCKBrandacousticalsealant
cabinethangerstrip
21/4"TYPESscrew(locatescrewsbetweenstuds)
Ceilingattachment
Veneer Plaster Systems
48 USGPlasterSystems
Design Details
Veneer Plaster Systems
WallControlJoint
ExteriorCornerFraming Jamb
doubleZ-furringchannels
Jamb
SHEETROCKBrandZ-furringchannels
sealant metaltrimorSHEETROCKBrandzinccontroljointno.093
1/4"min.
Wallcontroljointsteelstudsetinrunner
SHEETROCKBrandZ-furringchannels
3/8"TYPESpanheadscrew–24"o.c.
49 USGPlasterSystems
Furring Jamb–SteelDoorFrame
InteriorCorner ExteriorCorner
veneerfinish
veneerfinish
foil-backIMPERIAL
Brandgypsumbase
701-Bmetaltrim
7/8"furringdepth
metalfurringchannel
no.15asphaltfeltorTYVEKhomewrap
steelrunner
steelstud
veneerfinish
wallfurringbracketasrequired
foil-backIMPERIAL
Brandgypsumbase
3/8"panheadframingscrew
veneerfinish
foil-backIMPERIALBrandgypsumbase
metalfurringchannel
sealant
steeldoorframe
Jamb-steeldoorframe
701-Ametaltrim(shimtoplumb)
3"max.
foil-backIMPERIAL
Brandgypsumbase
veneerfinish
gasket
Metalwindowjamb
SHEETROCKBrand701-Bmetaltrim
SHEETROCKBrandno.800orno.900cornerbead
masonry
metalfurringchannel
1"TYPESscrew
7/8"
3"max.
1' 0"max.
6"max.
ROCKLATHplasterbase
cornerite
Interiorcorners
1"TYPESscrew
insulatingblankets gypsumplaster cornerbead
24"max.doubleZ-furringchannels
Exteriorcorners
Jamb–MetalWindow
Veneer Plaster Systems
50 USGPlasterSystems
Good Design Practices
Use this section as a reference if questions arise about using USG Plaster Systems.
This section is an overview of good design, application, installation and safety considerations that should be addressed when USG’s products and systems are used. This section outlines some major issues, but is not intended to be a comprehensive review. No attempt is made at completeness.
We recommend that architects and contractors seek the assistance of safety professionals, especially at the professional construction site, because there are many factors to consider that are not included here.
These products must not be used in a design or construction without a complete evaluation by a qualified structural engineer or architect to verify suitability of a particular product for use in the structure. For more information on safety and material handling, please refer to Chapter 13 of The Gypsum Construction Handbook, Centennial Edition.
1 SystemPerformance UnitedStatesGypsumCompanyconductstestsonproductsandsystemstomeetperformancerequirementsof
establishedtestproceduresspecifiedbyvariousagencies.Uponwrittenrequestwewillprovidetestcertificationfor
publishedfire,sound,structuralandotherpertinentdatacoveringsystemsdesignedandconstructedaccordingtoour
publishedspecifications.SubstitutionsofanyofthecomponentsarenotrecommendedorsupportedbytheUnited
StatesGypsumCompany.
2 DoorandBorrowed- Steeldoorandborrowed-lightframesshouldbeatleast16ga.steelplatesweldedintrimflanges,withprovisionfor
LightOpenings twopower-drivenanchorsorequalperplate.Jambanchorsshouldbe18ga.steelweldedinjamb.Studreinforcing
describedbelowisscrew-attachedtojambanchors.Three-pieceframesmayalsobeusedwiththesepartitionsprovided
endofpartitionfloorrunnerisanchoredwithtwosuitablefasteners.
Forstandarddoorsupto3809wideweighingnotmorethan100lbs.,25ga.steelstudsandrunnersmaybe
usedforframingtheopening.Fordoors2889to4809wide(200lbs.max.),roughframingshouldbe20ga.studs
(3-5/89min.)andrunners.Forheavydoorsupto4809wide(300lbs.max.),two20ga.studsshouldbeused.For
doorsover4809wide,doubledoorsandextra-heavydoors(over300lbs.),framingshouldbespeciallydesignedto
meetloadconditions.
Fullgroutingofdoorframesisalwaysrecommendedandisrequiredwhereheavyoroversizedoorsareused.
Asagrout,use100:2ReD topBrandGypsumPlaster/sandmix,addingenoughwatersothatthematerialisstiffbut
workable.Undernoconditionsshouldthelathandplasterterminateagainstthetrimofthedoorframe.
51 USGPlasterSystems
Spotgroutingforstandarddoorsandopeningsorwherespecifiedisrecommendedasaminimumtofullgrout-
ing.Tospotgrout,applyjob-sandedReD topBrandGypsumPlaster,StRucto-liteGypsumPlasterorSheetRockBrand
DuRabonDSetting-TypeJointCompoundmixedinaccordancewithbaginstructionstoeachjambanchor,fillingthe
insidefaceofthejambateachpoint.Immediatelyinsertplasterbaseintothejambandattachtoframing.Donot
terminatebaseagainstthetrim.
Groutingoftube-typeframesorexteriordoorframesisnotrecommendedatanytime,asgroutisunabletodry
properlyandmaycausemetalframestorust.
� Ceilings Spacingofhangersandchannelsisdesignedtosupportonlythedeadload.Heavyconcentratedloadsshouldbe
independentlysupported.Lightingfixturesortroffers,airvents,andotherequipmentshouldbeseparatelysupported
fromtheceilinggridorstructureabove;gypsumbasewillnotsupporttheseitems.
Topreventobjectionablesaginnewgypsumbaseceilings,theweightofoverlaidunsupportedinsulationshould
notexceed1.3psffor1/29thickbasewithframespacing249o.c.;2.2psffor1.29baseon169o.c.framingand
5/89baseon249o.c.framing.Foil-backbaseoraseparatevaporretardershouldbeinstalledinallroofedceilingsif
requiredbydesign,andtheplenumoratticspaceventedwithamin.1/2sq.in.netfreeventareapersq.ft.of
horizontalsurface.
4 ControlJoints Compensationmustbemadefordimensionalchangesinwallandceilingsurfacescausedbychangesintemperature
andhumidity.Locationofcontroljointsistheresponsibilityofthedesignprofessional/architect.
Gypsumbaseassembliesshouldbeisolatedwithcontroljointsorbyothermeanswhere:(a)partitionorfurring
abutsastructuralelement(exceptfloor)ordissimilarwallorceiling;(b)ceilingabutsastructuralelement,dissimilar
wall,partitionorotherverticalpenetration;(c)constructionchangeswithintheplaneofthepartitionorceiling;(d)
partitionorfurringrunexceeds308;(e)ceilingdimensionsexceed508ineitherdirectionwithperimeterrelief,308
withoutrelief;(f)expansionorcontroljointsoccurinthebaseexteriorwall.
Ceilingheightdoorframesmaybeusedascontroljoints.Less-than-ceilingheightframesshouldhavecontrol
jointsextendingtoceilingfrombothcorners.
SheetRockBrandZincControlJoints,whenproperlyinsulatedorbackedbygypsumboard,havebeenfire-endurance
testedandarecertifiedforuseinone-andtwo-hourfire-ratedwalls.
RefertoPM17,Preventing Cracks in Veneer and Conventional Plaster Systems,forcompleteinformation.
5 Penetrations Penetrationsofthelath-and-plasterdiaphragmsuchasborrowedlights,accesspanelsandlighttroffers,require
additionalreinforcementatcornerstodistributeconcentratedstressifacontroljointisnotused.
� Plaster/Metal Whereaplastersurfaceisflushwithmetal,metalbucks,metalwindowsormetalbase,theplastershouldbetrowel-
Interface cutbetweenthetwomaterials.
� PipeandConduit Additionalchasescanbeprovidedinsteelstuds(exceptinfire-ratedconstruction)bycuttingroundholesupto3/4of
Chase studwidth,spaced129apart.
52 USGPlasterSystems
Good Design Practices
8 CeramicTile impeRialBrandGypsumBaseandRocklathPlasterBasearenotrecommendedasabasefortheadhesiveapplication
ofceramictileandplastic-facedpanels.FibeRock Brandaqua-touGh InteriorPanelsorDuRockBrandCementBoardis
recommendedforthisuse.Double-layerpanelsarerequiredforresilientsystems.RefertoSA934,Moisture-Resistant
Assemblies, andSA927,Gypsum Panels and Accessories.
9 FixtureAttachment Lightweightfixturesandtrimshouldbeinstalledwithtoggleboltsorhollowwallanchorsinsertedinthebase,and,
preferably,alsothroughthestud.Woodormetalmountingstripsforcabinetsandshelvingshouldbeboltedtostud
framing.
10 ZincAlloy Recommendedwherecorrosionduetohighhumidityorsalinecontentofaggregateispossible.Metallath,
Accessories controljointsandothermetalaccessories,includingzinc-alloyaccessories,shouldnotbeusedwithmagnesium
oxychloridecementstuccosorportlandcementstuccocontainingcalciumchlorideadditives.
11 JointTreatment Forsteelframesystems,SheetRockBrandeaSy SanDLightweightorDuRabonDSetting-TypeJointCompoundand
SheetRockBrandJointTapemustbeusedonalljointsandinternalcornersandallowedtosetanddrybeforeveneer
plasterapplication.SeePM5,Veneer Plaster Joint Reinforcement Systems,forcompleteinformation.
12 Decorating Plastersystemsmustbecompletelydrybeforedecoration.
Donotspecifypolyvinylacetate(PVA)primersforapplicationtoplasterfinishescontaininglime.Inthepresenceof
moisture,theseprimerscancausebondlosswithresultantpaintdelaminationandjobfailure.
Cautionshouldbeusedinselectionanduseofepoxy-basedfinishsystemsoverlimeputty/gaugingplasterand
lime-containingfinishplastersasthesehigh-strengthcoatingsystemscreateasignificantdegreeofsurfacestressat
thecoating/plasterinterface.Useofapenetratingprimer/sealerisrequiredtoadequatelyenhanceandfortifythe
plastersurfacewhensuchfinishcoatingsystemsareused.Inallcases,thepaintmanufacturershouldbeconsultedin
selectionandfinalapplicationprocedures.
Veneer—Paintingorfurtherdecorationofallplasterfinishesisrecommendedandshouldbespecified.However,in
manyresidentialapplications,DiamonDBrandInteriorFinishandDiamonDBrandInteriorFinishTypeFPlastersprovide
auniformwhitecolorandmaysatisfyajob’sspecificacceptancespecificationswhentexturedandleftundecorated.
impeRialFinishPlasterandDiamonDBrandInteriorFinishPlasters,ifcompletelydry,maybepaintedthedayafterappli-
cationwithacrylic,latexorvinyl-breather-typepaints.
Conventional—Gauged-limeputtyandReD topBrandFinishappliedoverconventionalbasecoatplastersmustage
30daysandbethoroughlydryandproperlysealedbeforedecorating.Quick-dryingvinylacryliclatexoralkali-resistant
alkydprimer-sealersarerecommended.
RefertoPM15,PaintingPlaster,forcompleterecommendationsonprimingandpainting.Forinformationon
decoratingwithcolor-enhancedfinishplaster,seeP759,Decorative Interior Finish Systems.
1� SoundControl SoundtestsareconductedunderideallaboratoryconditionsperASTMprocedures.Comparablefieldperformance
dependsonbuildingdesignandcarefulattentiontodetailingandworkmanship.Wherethesepartitionsareusedfor
soundcontrol,sealthepartitionperimeterwith1/49min.roundbeadofSheetRockBrandAcousticalSealant.Seal
aroundallcutoutsforlights,cabinets,pipes,ductsandelectricalboxes.Back-to-backpenetrationsofthediaphragm,
flankingpathsanddoorandborrowed-lightopeningsshouldbeavoided.Wheresoundisolationistheprimary
consideration,onlysand-aggregatedbasecoatplastersshouldbeused.
8 CeramicTile impeRialBrandGypsumBaseandRocklathPlasterBasearenotrecommendedasabasefortheadhesiveapplication
ofceramictileandplastic-facedpanels.FibeRock Brandaqua-touGh TileBackerboardorDuRockBrandCementBoardis
recommendedforthisuse.Double-layerpanelsarerequiredforresilientsystems.RefertoSA934,Moisture-Resistant
Assemblies, andSA927,Gypsum Panels and Accessories.
9 FixtureAttachment Lightweightfixturesandtrimshouldbeinstalledwithtoggleboltsorhollowwallanchorsinsertedinthebase,and,
preferably,alsothroughthestud.Woodormetalmountingstripsforcabinetsandshelvingshouldbeboltedtostud
framing.
10 ZincAlloy Recommendedwherecorrosionduetohighhumidityorsalinecontentofaggregateispossible.Metallath,
Accessories controljointsandothermetalaccessories,includingzinc-alloyaccessories,shouldnotbeusedwithmagnesium
oxychloridecementstuccosorportlandcementstuccocontainingcalciumchlorideadditives.
11 JointTreatment Forsteelframesystems,SheetRockBrandeaSy SanDLightweightorDuRabonDSetting-TypeJointCompoundand
SheetRockBrandJointTapemustbeusedonalljointsandinternalcornersandallowedtosetanddrybeforeveneer
plasterapplication.SeePM5,Veneer Plaster Joint Reinforcement Systems,forcompleteinformation.
12 Decorating Plastersystemsmustbecompletelydrybeforedecoration.
Donotspecifypolyvinylacetate(PVA)primersforapplicationtoplasterfinishescontaininglime.Inthepresenceof
moisture,theseprimerscancausebondlosswithresultantpaintdelaminationandjobfailure.
Cautionshouldbeusedinselectionanduseofepoxy-basedfinishsystemsoverlimeputty/gaugingplasterand
lime-containingfinishplastersasthesehigh-strengthcoatingsystemscreateasignificantdegreeofsurfacestressat
thecoating/plasterinterface.Useofapenetratingprimer/sealerisrequiredtoadequatelyenhanceandfortifythe
plastersurfacewhensuchfinishcoatingsystemsareused.Inallcases,thepaintmanufacturershouldbeconsultedin
selectionandfinalapplicationprocedures.
Veneer—Paintingorfurtherdecorationofallplasterfinishesisrecommendedandshouldbespecified.However,in
manyresidentialapplications,DiamonDBrandInteriorFinishandDiamonDBrandInteriorFinishTypeFPlastersprovide
auniformwhitecolorandmaysatisfyajob’sspecificacceptancespecificationswhentexturedandleftundecorated.
impeRialFinishPlasterandDiamonDBrandInteriorFinishPlasters,ifcompletelydry,maybepaintedthedayafterappli-
cationwithacrylic,latexorvinyl-breather-typepaints.
Conventional—Gauged-limeputtyandReD topBrandFinishappliedoverconventionalbasecoatplastersmustage
30daysandbethoroughlydryandproperlysealedbeforedecorating.Quick-dryingvinylacryliclatexoralkali-resistant
alkydprimer-sealersarerecommended.
RefertoPM15,PaintingPlaster,forcompleterecommendationsonprimingandpainting.Forinformationon
decoratingwithcolor-enhancedfinishplaster,seeP759,Decorative Interior Finish Systems.
1� SoundControl SoundtestsareconductedunderideallaboratoryconditionsperASTMprocedures.Comparablefieldperformance
dependsonbuildingdesignandcarefulattentiontodetailingandworkmanship.Wherethesepartitionsareusedfor
soundcontrol,sealthepartitionperimeterwith1/49min.roundbeadofSheetRockBrandAcousticalSealant.Seal
aroundallcutoutsforlights,cabinets,pipes,ductsandelectricalboxes.Back-to-backpenetrationsofthediaphragm,
flankingpathsanddoorandborrowed-lightopeningsshouldbeavoided.Wheresoundisolationistheprimary
consideration,onlysand-aggregatedbasecoatplastersshouldbeused.
5� USGPlasterSystems
14 Shadowingand Temperaturedifferentialsontheinteriorsurfaceofexteriorwallsmayresultincollectionofairbornedirtonthecolder
Spotting surfaceareas.Consequently,accumulateddirtintheformofshadowingandspottingmayoccuratlocationsoffasteners
orframingwheresurfacetemperaturesusuallyarelowest.Thisisanaturalphenomenonwhichoccursthroughnofault
oftheproducts.
Wheretemperature,humidityandsoilingconditionsareexpectedtocauseobjectionableshadowingandspotting,
oneofthefollowingalternativesshouldbeconsidered:
A. TheinteriorfacingofimpeRialBrandFoil-BackGypsumBaseshouldbefurredfromtheexteriorwallstudsusingabase
layerofpanelsscrew-attachedtothestudsandhorizontallyappliedmetalfurringchannelsspaced249o.c.
B. Onexteriormasonrywalls,installrigidorsemi-rigidinsulationbetweenSheetRockBrandZ-FurringChannelsaffixedto
interiorsideofwallandfinishwithimpeRialBrandFoil-BackGypsumBase.
C. Formaximumresistancetoshadowingandspotting,aseparatefree-standingwallconstructionisrecommendedusing
studsthatareindependentoftheexteriorwall.
15 High-RiseBuildings Variablewindpressurecancauseastructuretodriftorsway.Thiscanresultinmovementofthenon-loadbearing
partitions,causingnoise.UnitedStatesGypsumCompanyassumesnoresponsibilityfortheprevention,cause,or
repairofthesejob-relatednoises.
1� Note UnitedStatesGypsumCompanyreservestherighttomakechangesorimprovementsinthedesignofallcatalogued
itemswithoutnoticeandwithoutobligationtoincorporatethesechangesorimprovementsinitemsalreadymanufactured.
1� Specifications Thefollowingareminimumbasicguidesforpreparationofjobspecifications.Theyarepreparedfornormalconstruction
andarenotintendedtocovereverypossibledesignorjobcondition.Specificproductdatasheetsareavailablefrom
UnitedStatesGypsumCompanyforadditionaldetailsandplasterspecifications.Requestsforthesepublicationscanbe
directedtothelocalsalesofficesidentifiedonthelastpageofthisbrochure.
18 Additional SeeSA100,Fire-Resistant Assemblies,forfire-andsound-ratedsystems;SA933,Aesthetic Assemblies, for
Information texturingspecifications;SA934,Moisture-Resistant Assemblies; andSA927,Gypsum Panels and Accessories,for
informationongypsumpanels;andforinformationonmoisture-resistantpanelsandboards.
54 USGPlasterSystems
Application Guide Specifications
ThisguideisprovidedtoassistyouinspecificationofUSGPlasterSystems.IfyouhaveadditionalquestionsorwouldlikemoreinformationregardingthisorotherUSGproductsandsystems,pleasecontactUSGat800USG.4YOU.
Part 1: General
1.1 Specifyareastoreceivethistreatment.Scope
1.2 AllmaterialsdescribedinthispublicationmanufacturedbyorforUnitedStatesGypsumCompanyshallbeinstalledQualifications inaccordancewithitscurrentprinteddirections.
Warning:StoreallimpeRialBrandGypsumBase,FibeRockBrandPanelsandDuRockBrandCementBoardflat.Panels
areheavyandcanfallover,causingseriousinjuryordeath.Donotmoveunlessauthorized.
1.� Allmaterials,exceptwaterandsand,shallbedeliveredintheiroriginalunopenedpackagesandstoredinanenclosedDeliveryandStorage shelterprovidingprotectionfromdamageandexposuretotheelements.DamagedordeterioratedmaterialsshallbeofMaterials
removedfromthepremises.
1.4 1. Incoldweather,allglazingshallbecompletedandthebuildingheatedtoaminimumof55°F(13°C)beforegypsumEnvironmental baseandlathinstallation.Temperatureofbuildingshallbemaintainedinuniformrangeabove55°FforanadequateConditions
periodpriortoapplicationofplaster,whileplasteringisbeingdone,anduntilplasterisdry.Whenrequired,heatshallbe
furnishedby().
Heatshallbewelldistributedinallareas,withdeflectionorprotectivescreensusedtopreventconcentratedor
unevenheatdistributiononplasternearsource.
2. Ventilationandaircirculationshallbekepttoaminimumlevelduringveneerplasteringuntiltheplasterhassetand
completelydried.
3. Ventilationshallbeprovidedtoproperlydryconventionalplasterduringandsubsequenttoitsapplication.Inglazed
buildings,thisshallbeaccomplishedbykeepingwindowsopensufficientlytoprovideaircirculation;inenclosedareas
lackingnormalventilation,provisionsmustbemadetomechanicallyremovemoisture-ladenair.
4. Ifglazedsashesarenotinplaceandthebuildingissubjecttohot,drywindsortemperaturedifferentialsfrom
daytonightof20°F(11°C)ormore,openingsshallbescreenedwithcheeseclothorsimilarmaterial.
1.5 ProperprotectionshallbeprovidedduringplasteringforfinisheddoorandwindowframesandotherdesignatedareasProtection thatdonotreceiveaplasterfinish.
1.� 1. Withapplicationoverinteriormonolithicconcrete,surfacemustfirstbetreatedwithanapplicationofUSGPlaster BasecoatPlaster Bonder.GeneralLimitations
2. Basecoatsurfacemustbeserratedorbroomedtoroughenandopenthesurfacetoallowforpropersuctionand
todevelopproperbondofthefinishcoattothebasecoat.
3. Gypsumplastersshouldnotbeusedwheretheywillcomeincontactwithwaterorexcessivemoisture.Maybeapplied
toexteriorsoffitsprotectedfromdirectexposuretorainandmoisture.Suitabledripsandcasingsalongtheedgesare
required.
4. Plasterapplicationisnotrecommendedoverbituminouscompoundsorotherwaterproofingagents.
5. Interiorsurfaceofexteriormasonryormonolithicconcretewallsshallbefurredandlathedpriortoplastering.
55 USGPlasterSystems
6. StRucto-liteGypsumPlasterorbasecoatplasterscontainingjob-mixedlightweightaggregaterequirealime-gauging
finishplastercontainingafineaggregatetocontrolsurfacecracking.
7. Lightweightbasecoatplastersshallnotbespecifiedovermetallathwhensmoothtrowelfinishisrequired.
8. Generalpracticedictatesthatthereshouldbealowersand-to-gypsumplasterratiointhescratchcoatthaninthebrown
coat.
1.� 1. Applicationthicknessforveneerbasecoat,veneerfinishing,gauging-limeorfactory-preparedgauging-limefinishVeneerPlaster plastersis1/169-3/329.Systems
2. Rapiddryingconditions,steelframingandcertainframingsituationson249o.c.requireuseofpapertapeandsetting-Limitations typecompound.
A. Substrates
1. Ceramictileshouldnotbeattacheddirectlytoveneerbase;plastermustbeappliedfirst.
2. Foil-backedbaseshouldnotbeusedasasubstrateforceramictile,orasthefacelayerinmultilayersystems.
3. Masonrysubstratemustbeclean,porous,withjointsstruckflush,andmayneedtobedampenedtocontrolexcess
suction.Atwo-coatsystemisrequiredovermasonry.
4. Monolithicconcretemustbeclean,fullycured,andfreeofoils,efflorescenceandotherforeignmaterials.USGPlaster
Bondermustbeappliedpriortoplasterapplication.
5. SunfadedimpeRialBrandGypsumBaseshouldbetreatedwithUSGPlasterBonderorasolutionofUSGAccelerator
AlumCatalystbeforeplasterapplicationwhenapplyingDiamonDBrandInteriorFinishPlaster.
B. Basecoats
MaybeapplieddirectlytoporousunitmasonryorovercuredmonolithicconcretetreatedwithUSGPlasterBonder.
Oncethebasecoatisappliedandhasbecomefirm,thesurfaceshallberakedorbroomedtoprovidearough,open
surfacenecessaryforpropersuctionandfinishcoatbond.
C. VeneerFinishes
1. Singlecoatveneerplasterfinishesarenotrecommendedforuseoverportlandcementbasecoatsorunitmasonry
construction.
2. Onlyjob-sandedDiamonDBrandInteriorFinishPlasterisrecommendedforelectricheatcables.Whenjob-sandedDiamonD
BrandInteriorFinishPlasterisusedforaradiantheatsystem,thecable-sheathoperatingtemperatures
mustnotexceed125°F.
1.8 1. LimegaugingfinishesarenotrecommendedforsmoothapplicationoverlightweightaggregategypsumbasecoatFinishCoatPlaster appliedovermetallath.Onlysand-floatfinishesarerecommendedovermetallath.GeneralLimitations
2. Wherethegypsumbasecoatcontainslightweightaggregate(perliteorvermiculite),thefinishcoatshouldbe:
a)Quality(ReD top,champion,orStaRWhite)factory-aggregatedgaugingplaster,or
b)ReD topBrandGaugingPlasterandlimewithadditionof1/2cu.ft.ofperlitefinesper100lbs.gaugingplaster,or
c)ReD topBrandGaugingPlasterandlimewithadditionof50lb.ofNo.1whitesilicasandper100lbs.gaugingplaster.
3. Gypsumandlime-basedfinishes,includingKeenesCement,shouldnotbeuseddirectlyoveraportlandcement
basecoatoroverconcreteblockorothermasonrysurfaces.
4. SmoothtrowelhighstrengthfinishessuchasStRucto-GauGeGaugingPlasterandReD topBrandKeenesCementmustnot
beusedoverStRucto-liteGypsumPlasterorabasecoatwithalightweightaggregate.
5� USGPlasterSystems
Application Guide Specifications
5. Gauged-limeputtyandReD topBrandFinishappliedoverconventionalbasecoatplastersmustage30days,be
thoroughlydryandproperlysealedbeforedecorating.Quick-dryingvinylacryliclatexoralkali-resistantalkydpaints
andprimer-sealersarerecommended.
6. Primerscontainingpolyvinylacetate(PVA)arenotrecommendedandshouldnotbespecifiedforusewithanyplaster
finishwiththeexceptionofimpeRialBrandFinishPlaster.PVAprimerscancausebondlosswithresultantpaint
delaminationandjobfailurewhenusedoverlimecontainingplasters.Strictlyfollowthespecificproductrecommendations
ofpaintmanufacturersforpaintinglime-gaugingputtyfinishes.
7. NeveruseportlandcementasabasecoatbeneathaKeenesCement/limeputtyfinishcoat.
1.9 1. Maximumframespacingfor3/89RocklathPlasterBaseshouldnotexceed169o.c.GypsumPlaster 2. Forgeneralinformationonsteelframing,consultSA100,Fire-Resistant Assemblies.LathLimitations
3. Shallbeusedwithgypsumplastersonly.Lime-basedplasterandportlandcementplasterareincompatiblewithRocklath
BrandPlasterBaseandshallnotbespecified.
4. Shallnotbeusedinareaswithsustainedhighrelativehumidityorwhereexposedtoexcessivemoistureforextended
periods.(Galvanizedmetallathandportlandcement-limeplasteroraDuRockBrandCementBoardSystemisrecommended
forwetareas.SeeSA700,Exterior System Substrates,andSA934,Moisture-Resistant Assembliesformoreinforma-
tion.)
1.10 1. MetallathproductsshallnotbeusedwithmagnesiumoxychloridecementstuccosorstuccoscontainingcalciumMetalLathGeneral chlorideadditives.Limitations
2. Inceilingassemblies,amin.of1/2sq.in.netfreeventareaisrecommendedpersq.ft.ofhorizontalsurfaceinplenum
orotherspacerequired.
1.11 1. Theseconstructionsshouldnotbeusedwherenormallyexposedtoexcessivemoisture,humidityortemperature.Wood-Framed 2. type Sscrewsmustbeusedforattachmentofsingle-layerbasetoresilientchannels.VeneerPlaster
3 Resilientchannelsmustbeattachedtowoodframingonlywith1-1/29TypeWscrews.Nailsshouldnotbeused.Systems 4. Resilientceilingsshouldnotbeinstalledbeneathhighlyflexiblefloorjoists.Limitations
5. SheetRockBrandJointTapeandSheetRockBrandeaSy SanDLightweightorDuRabonDSetting-TypeJointCompoundmust
beusedtotreatalljointsandinternalangleswhenanyofthefollowingconditionsexist:rapiddryingconditionsdueto
lowhumidity,hightemperature,andexcessiveevaporation,or249o.c.woodframespacingandasinglelayergypsum
baseveneersystemisspecified(5/89basewithone-coatveneerfinishand1/29or5/89basewithtwo-coatveneer
finish).Allowjointtreatmenttosetanddrythoroughlybeforeplasterapplication.
6. Topreventfastenerpopping,impeRialBrandPlasterBaseshouldbeattachedwithfastenersdrivenflushwiththesurface,
andnotdimpled.
1.12 1. Non-loadbearing.Steel-Framed 2. Theseassembliesshouldnotbeusedwhereexposedtoexcessivemoisture,humidityortemperature.VeneerPlaster
3. Maximumframespacing,andsteelstud/runnerstructuralpropertieslimitingheightsshouldnotbeexceeded.ConsultSystems studmanufacturer’stablesandstructuralpropertiestodeterminefinalstudselection.Limitations
4. Selectlimitingheightsanddeflectionsforsteel-framedveneerplastersystemsasfollows:
a)L/240forveneerplastersystems
5� USGPlasterSystems
b)L/360forconventionalplastersystemsandotherbrittlesurfacematerials
c)L/360isrecommendedinspecificcriticalareassuchasfortallwalls,wallswithfullorpartialheighttile,
andwallsreceivingeccentricloading(e.g.,shelvingononeside)
5. JointsmustbefinishedusingSheetRockBrandJointTapeandSheetRockBrandeaSy SanDLightweightorDuRabonDSetting-
TypeJointCompound.Jointcompoundmustbeallowedtosetbeforeplasterapplication.
6. Controljointsarerequired;refertoGoodDesignPractices,No.4.
Part 2: Products
2.1 A. SteelStudsFraming,Furring, 25ga.(1-5/89),(2-1/29),(3-5/89),(49),(69),22ga.(2-1/29),(3-5/89),(49),(69),20ga.(2-1/29),(3-5/89),(49),(69).andAccessories
B. SteelRunners
25ga.(1-5/89),(2-1/29),(3-5/89),(49),(69),22ga.(2-1/29),(3-5/89),(49),(69),20ga.(2-1/29),(3-5/89),(49),(69).
C. LathingChannels
Cold-RolledChannels(3/49,1-1/29,29)(ptd,galv).
D. FurringChannels
MetalFurringChannels(DWC-25)(DWC-20)SheetRockBrandZ-FurringChannels(19,1-1/29,29,39).
E. ResilientChannels
Rc-1™ResilientChannelorequivalent.
F. MetalAngles
GalvanizedMetalAngles(1-3/89x7/89)(2-1/29x2-1/29).
2.2 A. impeRialBrandGypsumBaseVeneerPlasterBase (1/29)(5/89)(3/49)thick,489wide,squareedge,(Regular)(FiRecoDe)(FiRecoDeC)(AbuseResistant)(ultRacoDeCore),
(Foil-Back).
Note:Specifyonlywithveneerplaster,SheetRockBrandNo.800orNo.900CornerBeadandimpeRialBrandJoint
ReinforcementTape(TypeP)(type S)orSheetRockBrandJointTapeandSheetRockBrandeaSy SanDLightweightor
DuRabonDSetting-TypeJointCompound.
B. duRockBrandCementBoard
(1/29)(5/89)thick,489wide.
C. FibeRockBrandAbuse-ResistantPanels
(1/29)(5/89(5/89VHI)thick,489wide,taperededge.
2.� A. ScrewsPlasteringandTrim Size—(3/89)(7/169)(1/29)(19)(1-1/49)(1-1/29)(1-5/89)(29)(2-1/49)(2-1/29)(39);style—(framing,type SorAccessories—Veneer
S-12)(drywall,type S)(self-drilling,type S-12)(laminating,TypeG)(coarsethread,TypeW)(DuRock);head—(bugle)PlasterSystems (pan)(trim)(pancake)(low-profile)(mod.trusshead);coating—(reg)(corrosion-resistantTypeIIIcoatingorbetterper
ASTMB117(12hours)
B. CornerBead
SheetRockBrandNo.800(fordrywallandone-coatveneerplaster)SheetRockBrandNo.900(fortwo-coatveneer
plaster)SheetRockBrand4-AFlexibleCornerBead(forarchwaysandcurveddesigns).
58 USGPlasterSystems
Application Guide Specifications
C. Trim
SheetRockBrandNo.701-A(J-Type)No.701-B(L-Type)(fortwo-coatveneerplaster)SheetRockBrandNo.801-A,
No.801-B(forone-coatveneerplaster).
D. ZincControlJoint
SheetRockBrandNo.093ControlJoint.
E. JointReinforcement
SheetRockBrandJointTape,SheetRockBrandeaSy SanDLightweightorDuRabonDSetting-TypeJointCompound(foruse
oversteelframingandwhenrapiddryingconditionsexist)_______VeneerPlaster(specifyfromproductdescriptions)
and(29)(2-1/29)impeRialBrandTape(TypeP)(type S)(toembedtapeoverwoodframing).
F. Clip
MetalFurringChannelClip.
G. FurringBrackets
AdjustableWallFurringBrackets.
H. Wire
HangerWire(8ga.)TieWire(18ga.).
I. Caulking
SheetRockBrandAcousticalSealant.
J. LaminatingAdhesive
SheetRockBrandDuRabonDSetting-TypeJointCompound.
K. USGPlasterBonder
L. USGacRi-add™100%AcrylicAdd-MixFortifier
2.4 A. VeneerPlasterBasecoatPlasteringMaterial— impeRialBrandBasecoatPlaster,DiamonDBrandVeneerBasecoatPlaster.VeneerPlaster
B. VeneerPlaster—PreparedFinishSystems impeRialBrandFinishPlaster,DiamonDBrandInteriorFinishPlaster,ReD topBrandFinish.
C. FinishLime
ivoRy,SnowDRiFt(typeS);ReD top,GRanD pRize(typeN).
D. GaugingPlaster
ReD topBrandGauging,championGauging(white),StaRGauging(white),StRucto-GauGeGauging,ReD topBrand
KeenesCement.
E. Grout
Job-sandedReD topBrandGypsumPlaster,StRucto-liteGypsumPlaster,SheetRockBrandDuRabonDSetting-Type
JointCompound.
F. Water
Potablewithoutimpuritiesthataffectthesettingofgypsum.
G. SpecialPlasters
USGMoldingPlaster,WhitehyDRocalGypsumCement.
2.5 A. VeneerPlasterBasecoatMixes—VeneerPlaster __________shallbemixedinaccordancewithwaterproportionsidentifiedonbag.Mixfor2to5minuteswitha
cage-typepaddlemixerusinga900-1000rpm1/29drill.
59 USGPlasterSystems
B. VeneerPlaster—PreparedFinish
Addallbut1to2quartsoftherequiredwatertoanon-plasticmixingcontainer.Mixfor1to2minutes,addupto1to
2quartsofretainedwaterandthenmixfor1to2minutesmore.Mixwithacage-typepaddlemixerusinga900-1000
rpm1/29drill.(SeePM19.)
C. ConventionalPlastersoveraVeneerBasecoat
1. ivoRyorSnowDRiFtLime:Shallbemachine-mixedforimmediateusewithapprox.5-1/2to6gal.waterper50lb.bag.
2. GRanD pRizeLime:Shallbebox-soakedormachine-mixedusingapprox.6gal.waterper50lb.bag,andallowedtosoak
for16hours.
3. FinishPlaster:Shallbemixedinproportionbydryweightof______partsofgaugingto______partsoflime(specify
fromcoveragedata),accordingtoapplicablebagdirections.Overlightweightaggregatebasecoats(suchasStRucto-lite
GypsumPlaster)add1/2cu.ft.ofperlitefinesor50lbs.ofNo.1silicasandper100lb.ofgaugingplasterorusemill-
aggregated“quality”gaugingplaster.
D. USGDecorativeInteriorFinishSystem
2.� A. RocklathFiRecodePlasterBaseConventionalPlaster (3/89x249x969).Note:3/89x249x969RocklathFiRecoDeCorePlasterBaseisstandardavailableproduct.LathingMaterials
B. MetalLath
DiamondMeshLath(1.75,2.5,3.4)lb.,(ptd,galv);Self-FurringDiamondMeshLath(2.5,3.4)lb.,(ptd,galv),
(Paper-Backed—GradeBorGradeD),FlatRiblath(2.75,3.4)lb.,(ptd,galv),3/89Riblath(3.4)lb.,(ptd,galv).
2.� A. ScrewsLathingAccessories— Selectfromlistingin2.3A(above).Conventional
B. CornerBeadPlasterSystems 1-AExpanded,Double-X.
C. CasingBeads
CasingBead#66ExpandedFlange(1/49,3/89,1/29,5/89,3/49,7/89,19,1-1/49)(galv,zinc),CasingBead#66Short
Flange(1/49,3/89,1/29,3/49,7/89)(galv,zinc).
D. ZincControlJoint
SheetRockBrandZincControlJoint(#50,#75,#100)(zinc),Double-VExpansionJoint(1/29,3/49)(galv,zinc).
E. Reinforcement
Cornerite,Striplath.
F. Wire
HangerWire(8ga.),TieWire(18ga.).
2.8 A. BasecoatPlaster—ConventionalPlasteringMaterial— ReD topBrandGypsumPlaster,ReD topBrandWoodFiberPlaster,StRucto-baSeGypsumPlaster,StRucto-liteConventionalPlaster
GypsumPlaster.Systems B. Aggregate
Sand,perlite(meetingASTMC35)sandforfloatfinishesshallbegraded(white)silicasandpassinga(30mesh)
(20mesh)screen.
C. FinishLime
ivoRy,SnowDRiFt(typeS);GRanD pRize(typeN).
�0 USGPlasterSystems
Application Guide Specifications
D. GaugingPlaster
ReD topBrandGauging,championGauging(white),StaRGauging(white),StRucto-GauGeGauging,ReD topBrand
KeenesCement.
E. Grout
ReD topBrandGypsumPlaster,job-sanded,StRucto-liteGypsumPlaster,SheetRockBrandDuRabonDSetting-Type
JointCompound.
F. Water
Potablewithoutimpuritiesthataffectthesettingofgypsum.
G. SpecialPlasters
USGMoldingPlaster,WhitehyDRocalGypsumCement.
H. PortlandCement
Type1or2,perASTMC926.
2.9 A. BasecoatPlaster—ConventionalMixes— Basecoatplasterandaggregateshallbemixedinproportionsof______(specifyfromtechnicaldata).ConventionalPlaster
B. ivoRyorSnowdRiFtLime
Shallbemachine-mixedforimmediateusewithapprox.5-1/2to6gal.waterper50lb.bag.
C. GRand pRizeLime
Shallbebox-soakedormachine-mixedusingapprox.6gal.waterper50lb.bag,andallowedtosoakfor16hours.
D. FinishPlaster
Shallbemixedinproportionbydryweightof______partsofgaugingto______partsoflime(specifyfromcover-
agedata),accordingtoapplicablebagdirections.Overlightweightaggregatebasecoats(suchasStRucto-liteGypsum
Plaster)add1/2cu.ft.ofperlitefinesor(50lbs.ofsilicasandtomeetASTMC35per100lb.)ofgaugingplasteroruse
mill-aggregated“quality”gaugingplaster.
E. PortlandCement
Mixtype Slime(moRtaSeal™Mason’sLime)orTypeSAlime(bonDcRete®LimeperASTMC207)withportlandcementand
sandaccordingtoASTMC926,TypeLmortar;suggestedportlandcementtolimetosandratiosbyvolume.Basecoat:
Scratchcoat—1:1:8;browncoat—1:1:10.
Part 3: Execution
�.1 A. PartitionFramingInstallationSteelFramingand Attachsteelrunnersatfloorandceilingtostructuralelementswithsuitablefastenerslocated29fromeachendandFurringInstallation
spaced249o.c.,ortosuspendedceilingswithtoggleorhollowwallanchorsspaced169o.c.
Positionsteelstudsvertically,engagingbothfloorandceilingrunners,andspacedmax.(169)(249)o.c.When
necessary,splicestudswith89nestedlapandonepositiveattachmentperstudflange.Placestudsindirectcontact
withdoorframejambs,abuttingpartitions,partitioncornersandexistingconstructionelements.Wherestudsare
attachedtoexteriorwallsandpossibilityofwaterpenetrationthroughwallsexists,installasphaltfeltstripsbetween
studsandwallsurfaces.
Anchorallstudsadjacenttodoorandwindowframes,partitionintersections,cornersandfree-standingfurringto
ceilingandfloorrunnerflangeswithmetallockfastenertoolorscrews.Securelyanchorstudstojambandheadanchors
�1 USGPlasterSystems
ofdoororborrowed-lightframesbyboltorscrewattachment.Overmetaldoorandborrowed-lightframes,placea
cut-to-lengthsectionofrunner,withaweb-flangebendateachend,andsecuretostrut-studswithtwoscrewsin
eachbentweb.Positionacut-to-lengthstud(extendingtoceilingrunner)atverticalplasterbasejointsoverdoor
header.Whenattachingstudstosteelgridsystem,structuraladequacyofgridtosupportendreactionofwallmust
bedetermined.
B. ChaseWallFramingInstallation
Aligntwoparallelrowsoffloorandceilingrunnersspacedapartasdetailed.Attachtoconcreteslabswithconcrete
stubnailsorpower-drivenanchors249o.c.,tosuspendedceilingswithtoggleboltsorhollowwallanchors169o.c.,
ortowoodframingwithsuitablefasteners249o.c.
Positionsteelstudsverticallyinrunners(169)(249)o.c.,withflangesinthesamedirection,andwithstudson
oppositesidesofchasedirectlyacrossfromeachother.Anchorallstudsadjacenttodoorandwindowframes,partition
intersectionsandcornerstofloorandceilingrunnerflangeswithmetallockfastenertoolorscrews.
Cutcrossbracingmadefromgypsumbase129highbywallwidth.Placebetweenrowsofstuds.Spacebraces489
o.c.verticallyandattachtostudwebswithsixtype Sscrewsperbrace.Iflargerbracesareused,spacescrews89o.c.
max.oneachside.Attachsingle-layerorbase-layergypsumbasewith(19)type Sscrewsspaced129o.c.infieldand
89o.c.staggeredatjoints.
Bracingof2-1/29steelstudsmaybeusedinplaceofgypsumbraces.Anchorwebateachendofsteelbrace
withtwopanheadframingscrews.Whenchasewallstudsarenotopposite,installsteelstudcrossbraces249o.c.
horizontallyandsecurelyanchoreachendtoacontinuoushorizontal2-1/29runnerscrew-attachedtochasewall
studswithinthecavity.
C. CeilingGrillageInstallation
Space8ga.hangerwires489o.c.alongcarryingchannelsandwithin69ofendsofcarryingchannelruns.Inconcrete,
anchorhangersbyattachmenttoreinforcingsteel,byloopsembeddedatleast29orbyapprovedinserts.Forsteel
construction,wraphangeraroundorthroughbeamsorjoists.
Install1-1/29carryingchannels489o.c.,andwithin69ofwalls.Positionchannelsforproperceilingheight,level
andsecurewithhangerwiresaddle-tiedalongchannel.Provide19clearancebetweenrunnersandabuttingwallsand
partitions.Atchannelsplices,interlockflanges,overlapends129andsecureeachendwithdouble-strand18ga.tiewire.
Erectmetalfurringchannelsatrightanglesto1-1/29carryingchannelsormainsupportmembers.Spacefurring
(169)(249)o.c.andwithin69ofwalls.Provide19clearancebetweenfurringendsandabuttingwallsandpartitions.
Securefurringtocarryingchannelswithclipsorsaddle-tietosupportswithdouble-strand18ga.tiewire.Atsplices,
nestfurringchannelsatleast89andwire-tieeachendwithdouble-strand18ga.tiewire.
Atlighttroffersoranyopeningsthatinterruptthecarryingorfurringchannels,installadditionalcrossreinforcingto
restorelateralstabilityofgrillage.
D. Rc-1ResilientChannel(orEquivalent)Installation
Positionresilientchannelatrightangletosteelstuds,spaced249o.c.,andattachtosteelstudflangeswithpanhead
framingscrewsdriventhroughholesinchannelmountingflangeandtowoodframingwith1-1/49woodscrewsof
BuildexTypeW.Installchannelwithmountingflangedown,exceptatfloortoaccommodateattachment.Locatechan-
nels29fromfloorandwithin69ofceiling.Extendchannelsintoallcornersandattachtocornerframing.Cantilever
channelendsnomorethan69.Splicechannelbynestingdirectlyoverframingmember.Reinforcewithscrewslocated
atbothendsofsplice.UseofafillerstripatthebasemayreduceSTCrating.
Wherecabinetswillbeinstalled,attachresilientchannelstostudsattopandbottomcabinethangerbrackets.When
distancebetweenhangersexceeds249o.c.,installadditionalchannelatmidpointbetweenhangers.
�2 USGPlasterSystems
Application Guide Specifications
E. Z-FurringChannelInstallation
InstallinsulationverticallyandholdinplacewithZ-furringchannelsspaced249o.c.Exceptatexteriorcorners,attach
narrowflangesoffurringchannelstowallwithconcretestubnailsorpower-drivefastenersspaced249o.c.Atexterior
corners,attachwideflangeoffurringchanneltowallwithshortflangeextendingbeyondcorner.Onadjacentwall
surface,screw-attachshortflangeoffurringchanneltowebofattachedchannel.Startfromthisfurringchannelwith
astandardwidthinsulationpanelandcontinueinregularmanner.Atinteriorcorners,spacesecondchannelnomore
than129fromcornerandcutinsulationtofit.Holdmineral-fiberinsulationinplaceuntilgypsumbaseisinstalledwith
109longstaplefield-fabricatedfrom18ga.tiewireandinsertedthroughslotinchannel.Applywoodblockingaround
windowanddooropeningsandasrequiredforattachmentoffixturesandfurnishings.
F. WallFurringChannelAttachment—Direct
Attachmetalfurringchannelsvertically,spaced(169)(249)o.c.,tointeriorofmasonryorconcretesurfaceswith
hammer-setorpower-drivenfastenersorconcretestubnailsstaggered249o.c.onoppositeflanges.Wherefurring
channelisinstalleddirectlytoexteriorwallandapossibilityofwaterpenetrationthroughwallsexists,installasphalt
feltprotectionstripbetweenfurringchannelandwall.
�.2 Installmineralfiberinsulationaftergypsumbaseisapplieddirectlytothefaceofthestudsononesideofthepartition.SoundAttenuation Insertthe259wideblanketinthestudcavitybybowingtheblanketslightly.Afterinserting,makeaverticalcutintheFireBlanket
blanket(about19deep)onacenterlinebetweenthestuds.Buttendsofblanketscloselytogetherandfillallvoids.ApplyInstallation gypsumbasedirectlytostudsortoRCChannels(orequivalent)ontheoppositesideofthepartition.
�.� A. CeilingInstallationVeneerPlaster ApplygypsumbaseofmaximumpracticallengthwhereverpossibleonceilingsfirstwithlongdimensionperpendicularBaseInstallation
tofurringchannelswithbluefacepaperdown.Positionendjointsoverframingandstaggerinadjacentrows.
Fitendsandedgesclosely,butnotforcedtogether.Fastenbasetochannelswith19type Sscrewsspaced129o.c.
infieldofbaseandalongabuttingendsandedges.
Forsingle-layerresilientceilingsystem,applyimpeRialBrandGypsumBase,ceilingfirst,withlongdimensionatright
anglestochannels,andendjointsneatlyfittedandcenteredoverchannelattachmentflange.Attachwith19type S
screwsspaced129o.c.acrosseachchannelandperimeterscrewsnotlessthan3/89fromendsandedges.Support
gypsumbasearoundallcutoutsandopenings.
Fordouble-layerresilientceilingsystem,applybaselayerwithlongedgesacrossjoistsandendjointsstaggered.
Fastenbasetoframingwith8dcement-coatednailsspaced79o.c.Attachresilientchannelthroughbaselayer
perpendiculartoframingwith1-7/89type Sscrews.Installfacelayerwithlongdimensionacrosschannels;use19
type Sscrewsspaced129o.c.
B. SingleLayerGypsumBaseInstallation
Applygypsumbase(paralleltostuds)(perpendiculartostuds).Positionalledgesoverstudflangesforparallel
application;allendsoverstudflangesforperpendicularapplication.Tomaintainatruesurfaceplane,arrangedirection
ofapplicationsoleadingedgeofbaseisattachedfirsttoopenedgeofstudflange.Usemaximumpracticallengthsto
minimizeendjoints.Fitendsandedgesclosely,butnotforcedtogether.Staggerjointsonoppositesidesofpartition
placedondifferentstuds.
Fastenbasetostudframingwithscrewsspaced129o.cinfieldofbaseandalongabuttingendjoints.Screw
spacingshownisfornon-ratedconstruction.Forfire-ratedconstruction,obtainscrewspacingfromtestreport.
�� USGPlasterSystems
Drivefastenersinfieldofbaseinwoodframingfirst,workingtowardendsandedges.Holdbaseinfirmcontactwith
framingwhiledrivingfasteners.Spacenails79o.c.onceilings,89o.conwalls,screws129o.c.andperimeterfasteners
notlessthan3/89fromendsoredges.Drivefastenerheadsflushwithsurfaceofbase,notdimpled,andwithout
breakingpaper.Whereverbaseisnottightagainstframing,driveanotherfastenerwithin1-1/29offirstfastener.Float
gypsumbaseatverticalinterioranglesbyattachingtheoverlappingsheetofbaseonly,attheangle;athorizontal
interioranglesbyattachingbothsheetsofbasenocloserthan89fromtheangle.
C. DoubleLayerGypsumBaseErection
Forscrewattachment,spacescrews249o.c.forbaselayerand129o.c.forfacelayer.Applybothlayersofgypsum
baseparalleltostudswithjointsinfacelayeroffsetfrombaselayerjoints.For1/29or5/89base,use19screwsfor
baselayerand1-5/89screwsforfacelayer.
Indouble-layerlaminatedconstruction,attachbaselayerwith19type Sscrewsspaced129o.c.infieldofbase
andalongabuttingendsandedges.ApplyfacelayerparalleltostudswithspecifiedSheetRockBrandDuRabonD
Setting-TypeJointCompoundorSheetRockBrandTapingorAllPurposeReady-MixedJointCompoundspreadon
backside,jointsstaggeredapprox.129andfastenedtobaselayerwith1-1/29TypeGscrews.Drivescrews
approximately28fromendsand48o.c.infieldofpanel,18fromendsand38o.c.alongaline39fromvertical
edges.Screwspacingisfornon-ratedconstruction.Forfire-ratedconstruction,obtainscrewspacingfromtestreport.
D. duRockCementBoard
InstallDuRockCementBoardtosteelframingwithDuRockScrewsspaced89o.c.TreatjointsasspecifiedinSection3.4.G.
E. FibeRockBrandPanels
Inthistwo-coatveneerplastersystem,DiamonDBrandVeneerBasecoatPlasterandimpeRialBrandFinishPlasterare
appliedoverFibeRockBrandPanelsattachedtoframing.Spacewoodorsteelframing169o.c.or249o.c.Positionall
endsandedgesofpanelsoverframingmembers,exceptwhenjointsareatrightanglestoframingmembers,asin
perpendicularapplicationorwhenendjointsareback-blocked.Onwalls,fastenersarespacedamaximumof129o.c.
whetherframingspacingis249o.c.or169o.c.Forceilingapplications,nailsshouldbespacednomorethan79o.c.,
screws,129o.c.Notethat5/89FibeRockBrandPanelscanbesubstitutedfor5/89impeRialBrandFiRecoDeCoreGypsum
Baseor1/29impeRialBrandFiRecoDeCCoreGypsumBaseincertainfire-ratedpartitiondesignsinthisbrochureaslong
as20-gaugesteelframingisusedandthejointtreatmentprocedureinSection3.4.Gisfollowed.RefertotheULFire
ResistanceDirectoryforapplicabledesigns.
�.4 A. CornerBeadAccessoryApplication— Attachtoallverticalandhorizontalexteriorcornerswithnails,screws,or9/169galvanizedstaplesspaced129o.c. VeneerPlasterSystems
alongbothflangesalongtheentirelengthofboard.
B. ControlJoints
Installwhereindicatedonplans.Breakbasebehindjointandbackbydoublestuds.Applyacousticalsealantbehind
controljoint.(SheetRockBrandControlJointNo.093—square-cutendjoints,butttogetherandalignforneatfit.)Remove
protectivetapeafterplastering.
1. InteriorCeilings
Positioncontroljointstointersectlightfixtures,heatingvents,airdiffusers,etc.
2. InteriorWallsandPartitions
Spacecontroljointsmaximumof308apart;controljointsmayoccuroverdoorframesasindicatedindrawings.
�4 USGPlasterSystems
Application Guide Specifications
C. CasingBeadsandMetalTrim
ApplytoimpeRialBrandGypsumBasewithfastenersor9/169galvanizedstaples129o.c.Cutandmiterendsaccurately
andinstallwherepartitionsorceilingsterminateagainstmasonryordissimilarmaterial,andwhereindicated.
D. Screws
Power-driveandsetflushwithsurfaceofimpeRialBrandGypsumBasewithouttearingthroughthepaper.
E. LaminatingAdhesive
ForlaminatingdoublelayersofimpeRialBrandGypsumBase,spreadtoprovidefull1/29adhesivebeads4-1/29o.c.
forfullsheetlamination.Forstriplamination,applyadhesiveinverticalstripsoffour1/29beadsto29o.c.Space
strips249o.c.
F. JointSystem
Forveneerplastersystems,useSheetRockBrandJointTapeandSheetRockBrandeaSy SanD LightweightorDuRabonD
Setting-TypeJointCompoundtotreatalljointsandinternalangleswhenanyofthefollowingconditionsexists:rapiddrying
conditionsduetolowhumidity,hightemperatureorexcessiveevaporation;metalframingisspecified;249o.c.wood
framespacingandasingle-layergypsumbaseveneersystemisspecified(5/89basewithone-coatveneerfinishand
1/29or5/89basewithtwo-coatveneerfinish).Allowjointtreatmenttosetanddrythoroughlybeforeplasterapplication.
Overwoodframing,firmlyembedimpeRialBrandTypePTapetoensurewrinkle-freeattachmentoruse3/89staples
toapplyimpeRialBrandtype STape.Usetwostaplesateachendoftapeandstaggerintermediatestaples249o.calong
lengthoftape.Atintersectionsandcorners,staple249o.c.ononeedgeonly.Donotoverlaptapeatintersections,and
applyoverfulllengthofgypsumbase.
G. JointSystem(duRockBrandCementBoardorFibeRockBrandARInteriorPanels)
ApplyUSGPlasterBonderinacontinuousfilmtojointareas,thentreatjointareaswithSheetRockBrandJointTapeand
SheetRockBrandDuRabonDoreaSy SanDSetting-TypeJointCompound.Provideanadditionalcoatofsetting-type
compoundtofullyconcealthetape.Allowtocompletelydry.
�.5 A. GypsumBaseimpeRialBrand WhenapplieddirectlytoimpeRialBrandGypsumBase,embedtapeandfillbeads,andallowplastertoset,thenscratchBasecoatanddiamond
andimmediatelydoublebacktoathicknessof1/169to3/329,inaccordancewithmanufacturer’sdirections.BrandVeneer B. ConcreteBlock BasecoatPlasters
Whenapplieddirectlyoverunglazedconcreteblock,fillallvoidsanddepressionsincludingjoints.Sprayconcreteblock
uniformlywithwaterimmediatelybeforeapplyingbasecoat.Applybasecoatandleaveroughandopenandallowtoset
priortolimeputtyorveneerplasterfinishapplication.ReD topAcceleratormaybeusedtoquickenset.Totalbasecoat
shallbe1/169to3/329thick.
C. MonolithicConcrete
WhenappliedtomonolithicconcretetowhichUSGPlasterBonderistobeapplied,surfaceshallbefreeofdirt,dust,
grease,wax,oil,orotherunsoundsurfaceconditions.Laitance,efflorescenceandpartingcompoundsshallbechemi-
callyremoved.ApplyUSGPlasterBondertoconcretesurfaceinacontinuousfilmaccordingtoproductdirections.Apply
basecoatplasterwithfirmpressureinathincoatoverthebondingagent.Immediatelydoublebacktoacompleted
thicknessof1/169to3/329withalevelsurface.Itisessentialthattheappliedbasecoatsurfaceberakedorbroomed
oncethematerialhasbecomefirmforaroughandopensurfacetoprovidepropersuctionforfinishcoat.Failuretodo
somayresultindelaminationofthefinishplaster.
D. Whereplasterisflushwithmetalbase,metaldoorframes,etc.,trowel-cutatthejunctiontoreducethepossibilityof
chipping.Cutbasecoatplasterfreefromthesemetalsectionsbeforeplastersets.
�5 USGPlasterSystems
E. duRockBrandCementBoardorFibeRockBrandPanels
Whenthejointsarecompletelydry,treattheentirewallsurfacewithUSGPlasterBonderaccordingtotheapplication
directions.ThenapplyDiamonDBrandVeneerBasecoatPlaster1/169to3/329thickusingscratchanddouble-back
technique.Whenbasecoatplasterisfirm,broomthesurfacetoleaveitroughandopenforfinish.Withbasecoatsetand
partiallydry,applyimpeRialBrandFinishPlasterasspecifiedinSection3.7.C.Leavefinishedsurfacesmoothanddense
fordecorating.
�.� Shallbeshownonplans;however,innocaseshallthegroundsbelessthan:PlasterThicknesses— MasonryunitsandDuRockBrandCementBoard—upto3/169fortwo-coatveneerapplicationsVeneerPlasterSystems
Monolithicconcreteceilings—3/329(3/89maximum)
Monolithicconcretewalls—3/329(5/89maximum)
impeRialBrandPlasters—1/169to3/329(overspecialgypsumbase)
DiamonDBrandInteriorFinish(forelectricalcableceilings)—3/89(overspecialgypsumbaseormonolithicconcrete).
�.� A. diamondBrandInteriorFinishVeneerPlaster OverimpeRialBrandGypsumBasesembedtape,fillbeads,andallowtoset;thenapplyathin,tightscratchcoatover FinishApplications
entireworkingarea.Immediatelydoublebackwithmaterialfromsamebatchtoanom.1/169to3/329thickness.
OverDiamonDBrandVeneerBasecoatPlaster,scratchandimmediatelydoublebackto1/169to3/329thickness.Over
monolithicconcrete,applyUSGPlasterBonder,thenscratchanddoublebackwithajob-aggregatedplastertoa
3/329thickness.
B. diamondBrandInteriorFinish(forelectricalcableceilings)
Overmonolithicconcreteceilings,preparethesurfacewithUSGPlasterBonderinacontinuousfilm.Applyjob-sanded
DiamonDBrandInteriorFinishtoatotalthicknessof3/89—consistingofa5/169fillcoattocompletelycovercableand
anchoringdevices,and1/169finishcoat.
C. impeRialBrandFinish
OverimpeRialBrandGypsumBaseembedtape,fillbeadsandallowtoset;thenscratchandimmediatelydoublebackto
athicknessoffrom1/169to3/329inaccordancewithmanufacturer’sdirections.OverimpeRialBrandBasecoat,scratch
andimmediatelydoublebackto1/169thickness.
D. OtherFinishes
Inaddition,otherconventionalplasterfinishesmaybeappliedoverveneerbasecoat:
1. ivoRyorSnowdRiFtLime
Shallbemachine-mixedforimmediateusewithapprox.5-1/2to6gal.waterper50lb.bag.
2. GRand pRizeLime
Shallbebox-soakedormachine-mixedusingapprox.6gal.waterper50lb.bag,andallowedtosoakfor16hours.
3. FinishPlaster
Shallbemixedinproportionbydryweightof______partsofgaugingto________partsoflime(specifyfrom
coveragedata),accordingtoapplicablebagdirections.Overlightweightaggregatebasecoats(suchasStRucto-lite
GypsumPlaster),add1/2cu.ft.ofperlitefinesor50lb.ofsilicasandtomeetASTMC35per100lb.ofgaugingplaster
orusemill-aggregatedgaugingplaster.
�� USGPlasterSystems
Application Guide Specifications
4. TrowelFinishCoats
Scratchplasterinthoroughlyandimmediatelydoublebacktofillouttoasmooth,densesurfacefordecoration,freeof
surfaceblemishesandirregularities.Applyfinishcoatasthinaspossible,preferably1/169tonotmorethan3/329
maximumthickness.TrowelReD topBrandKeenesCementfinishesextensivelyuntilthematerialsets.
4. FloatFinishCoats
Scratchplasterinthoroughlyandimmediatelydoublebacktoatrue,evensurface.Floatusinga(shingle)(cork)(wood)
(carpet)(sponge),or(rubber)floattobringaggregatetothesurfacetoproduceafinishofuniformtexturefreeofslick
spots,catfaces,andotherblemishes.Usewatersparinglyonnaturalcolor,andnowateroncoloredfinishes.
5. Machine-AppliedSprayFinishes
Applyinitialcoatoffinishbyhandandfloattouniformtexturesurfacetoprovideabackground.Thenapplyplasterina
uniformspraypatterntoproduceatextureapprovedbythearchitectorowner.
E. FinishCoat
Browncoatmustbeleftroughened,openandpartiallydry(greenstate)toreceivefinishcoat.
Thefollowingfinishesarerecommendedandlistedindescendingorderofhardnessandabrasionresistance:
1. ReD topBrandFinishPlaster—Machinemixmill-mixedplasterfollowingthedirectionsonthebag.Applyatightscratch
coatovertheentireworkingarea.Immediatelydouble-backwithmaterialfromthesamebatchandfillouttoatrueand
evensurfacenominally1/169thick.Allowsurfacetobecomefirm,thentrowelwellwithwater.Dofinaltrowelingafter
thefinishhasbeguntoset.Surfaceshallbefreefromcatfacesandotherblemishesorirregularities.
2. StRucto-GauGeGaugingPlasterwithivoRy,SnowDRiFtorGRanD pRizeLime—Mixlimeinacleanmechanicalmixerora
portabledrillmixer;addonebagoflimeto5-1/2to6gallonsofwaterandmixuntilputtyissmooth.Mixfinishplaster
inproportionsbydryweightof1partgaugingplasterto1partlime.ApplyfinishplasterasdescribedforReD topFinish
Plaster.
3. champion,StaR,ReD toporGaugingPlasterwithivoRy,SnowDRiFtorGRanD pRizeLime—MixlimeasdescribedinNo.2,
above.Mixfinishplasterinproportionsbydryweightof1partgaugingplasterto2partslime.Applyfinishplasteras
describedforReD topFinishPlaster.
4. ReD topBrandKeenesCementwithivoRy,SnowDRiFt,orGRanD pRizeLimeforasandfloatfinish—Mixlimeasdescribedin
No.2,above.Mixfinishplasterinproportionsbydryweightto100lbs.KeenesCementPlasterto200lbs.limetonot
morethan800lbs.ofsandaggregate.Applyfloatfinishcoatbyscratchingplasterinthoroughlyandimmediatelydouble
backtoatrue,evensurface.Floatusingashingle,cork,wood,carpetorrubberfloattobringaggregatetothesurface
toproduceafinishofuniformtexturefreeofslickspots,catfacesandotherblemishes.Usewatersparingly.
�.8 PlasterBaseInstallationGypsumPlaster Apply3/89RocklathBrandPlasterBase,bottomcoursefirst,withfaceout,longdimensionatrightanglestostudsLathInstallation
andjointsbuttedtogether.Cutlathtofitneatlyaroundelectricaloutlets,openings,etc.Placeendjointsbetweenstuds,
staggeredinsuccessivecourses.Alignandsupportlathendsattop,centerandbottomofeachbuttjoint.Securelath
tostudsusingtwo19type Sscrewsperstud,eachlocated29fromlathedge.Check“FrameandFastenerSpacing—
RocklathPlasterBase”tableforrecommendationsforbasethicknessandtypesofframing.
�.9 A. ControlJointsAccessoryApplication— Installwhereindicatedonplans.Breakbaseorlathbehindjointandbackbydoublestuds.WherechannelframingisConventionalPlaster
used,alsobreakthechannels.(ControljointNos.50,75.100—spliceendstogetherwith16ga.tiewireinsertedintoSystems openingsinthekey-locksections.)
�� USGPlasterSystems
1. InteriorCeilings
Positioncontroljointstointersectlightfixtures,heatingvents,airdiffusers,etc.
2. InteriorWallsandPartitions
Spacecontroljointsmaximumof308apart;controljointsmayoccuroverdoorframesasindicatedindrawings.
3. PortlandCementStucco—ExteriorWalls,Soffits,andCanopies
Spacecontroljointsnotexceeding108ineitherdirection.Wherethereisanintersectionofverticalandhorizontaljoints,
usecontinuousverticaljointandbuttthehorizontaljoint.Caulksplicesandintersectionsexposedtotheelementswitha
siliconerubbercaulkingcement.Insoffitsandcanopies,breaklathandchannelbehindcontroljoints.
B. Reinforcing
Installself-furringDiamondMeshLathorCorneriteoverjointsbetweendissimilarconventionalplasterbases.Reinforce
openingswithStriplathstapleddiagonallyacrosscorners.InstallStriplathininteriorplasterangles.
�.10 Shallbeshownonplans;however,innocaseshallthegroundsbelessthan:PlasterThicknesses— Metallath—5/89(fromfaceoflath)ConventionalPlaster
RocklathBrandPlasterBase—1/29Systems Masonryunits—5/89conventional
�.11 A. MixesBasecoatPlaster— 1. BasecoatapplicationConventional
Mixbasecoatplastersbyhandorinamechanicalmixertoauniformconsistencyfollowingmanufacturer’sdirections.
Applybasecoatplasterby(hand)(machine)in(1)(2)coats.Monolithicorunitmasonrysurfacesthatexhibithighsuction
shallbemoderatelywettedimmediatelybeforeplastering.
2. Two-coatwork
Overgypsumlathandmasonry,applybase(first)coatwithsufficientmaterialandpressuretoformgoodbondtobase
andtocoverwell,andthendoublebacktobringplasterouttogrounds.Straightentoatruesurfacewithrodanddarby
withoutuseofadditionalwaterandleaveroughtoreceivefinish(second)coat.
3. Three-coatwork
Applyscratch(first)coatwithsufficientmaterialandpressuretoformgoodfullkeysonmetallath,andgoodbondon
otherbases,andthencross-rake.Applybrown(second)coatafterscratch(first)coathassetfirmandhard.Bringout
togroundsandstraightentoatruesurfacewithrodanddarbywithoutuseofadditionalwater.Leaveroughtoreceive
finish(third)coat.
�.12 A. MixesFinishCoatPlaster 1. VeneerPlaster—PreparedFinishApplications—
Addallbut1to2quartsoftherequiredwatertoanon-plasticmixingcontainer.Mixfor1to2minutes,addupto1toConventionalandOther 2quartsofretainedwaterandthenmixfor1to2minutesmore.Mixwithacage-typepaddlemixerusinga900-1000
rpm1/29drill.
2. ivoRyorSnowdRiFtLime
Shallbemachine-mixedforimmediateusewithapprox.5-1/2to6gal.waterper50lb.bag.
3. GRand pRizeorRed topLime
Shallbebox-soakedormachine-mixedusingapprox.6gal.waterper50lb.bag,andallowedtosoakfor16hours.
�8 USGPlasterSystems
Application Guide Specifications
4. FinishPlaster
Shallbemixedinproportionbydryweightof______partsofgaugingto________partsoflime(specifyfrom
coveragedata),accordingtoapplicablebagdirections.Overlightweightaggregatebasecoats(suchasStRucto-lite
GypsumPlaster),add1/2cu.ft.ofperlitefinesor50lb.ofNo.1silicasandper100lb.ofgaugingplasteroruse
mill-aggregated“quality”gaugingplaster.
5. TrowelFinishCoats
Scratchplasterinthoroughlyandimmediatelydoublebacktofillouttoasmooth,densesurfacefordecoration,freeof
surfaceblemishesandirregularities.Applyfinishcoatasthinaspossible,preferably1/169tonotmorethan1/89
maximumthickness.TrowelReD topKeenesCementfinishesextensivelyuntilthematerialsets.
6. FloatFinishCoats
Scratchplasterinthoroughlyandimmediatelydoublebacktoatrue,evensurface.Floatusinga(shingle)(cork)(wood)
(carpet)or(rubber)floattobringaggregatetothesurfacetoproduceafinishofuniformtexturefreeofslickspots,cat
facesandotherblemishes.Usewatersparinglyonnaturalcolor,andnowateroncoloredfinishes.
7. Machine-AppliedSprayFinishes
Applyinitialcoatoffinishbyhandandfloattouniformtexturesurfacetoprovideabackground.Thenapplyplasterina
uniformspraypatterntoproduceatextureapprovedbythearchitectorowner.
8. FinishCoat
Browncoatmustbepartiallydry(greenstate)toreceivefinishcoat.
Thefollowingfinishesarerecommendedandlistedindescendingorderofhardnessandabrasionresistance:
a. impeRialBrandFinishPlaster—MixplasterasrecommendedinU.S.GypsumCompanyTechnicalDataSheetsP528and
PM9.Applyatightscratchcoatovertheentireworkingarea.Immediatelydouble-backwithmaterialfromthesame
batchtoanominal1/169thickness.Layonmaterialinauniformmannertoavoidtrowelmarks,lapsandexcess
material.Undernocircumstancesshouldthesurfaceberewettedwithwaterorover-worked,asthiswillonlyresultin
subjectingthesurfacetoblisteringandfurthertrowelmarks.Thesurfaceissmooth-troweledonlyafterinitialfirmness
isreached,andfinaltroweledoncefullfirmnessoccurs.Watertrowelingmustbeavoided.Thewallsurfacemustbeleft
“underthetrowel”;donotusewaterbrushorblisterbrushonfinishedsurface.
b. DiamonDBrandInteriorFinishPlaster—MixplasterasrecommendedinU.S.GypsumCompanyTechnicalDataSheets
P529andPM9.Applyatightscratchcoatovertheentireworkingarea.Immediatelydouble-backwithmaterialfrom
thesamebatchtoanominal1/169thickness.StaRtfinishtrowelingassoonasmaterialhasbecomesufficientlyfirmto
achieveasmoothsurfacefreefrommarks,voids,andotherblemishes.Smoothandlevelthesurfacewiththetrowel
heldflat;usewatersparinglytolubricate.Finalsmoothtrowelingshouldbeaccomplishedpriortosetasindicatedby
darkeningofthesurface.
c. ReD topBrandFinishPlaster—Machinemixmill-mixedfinishplasterfollowingthedirectionsonthebag.Applyatight
scratchcoatovertheentireworkingarea.Immediatelydouble-backwithmaterialfromthesamebatchandfillouttoa
trueandevensurfacenominally1/169thick.Allowsurfacetobecomefirm,thentrowelwellwithwater.Dofinaltroweling
afterthefinishhasbeguntoset.Surfaceshallbefreefromcatfacesandotherblemishesorirregularities.
d. StRucto-GauGeGaugingPlasterwithivoRy,SnowDRiFtorGRanD pRizeLime—Mixlimeinacleanmechanicalmixeroraportable
drillmixer;addonebagoflimeto5-1/2to6gallonsofwaterandmixuntilputtyissmooth.Mixfinishplasterinproportions
bydryweightof1partgaugingplasterto1partlime.ApplyfinishplasterasdescribedforReD topFinishPlaster.
e. champion,StaR,ReD toporQualityGaugingPlasterwithivoRy,SnowDRiFt,orGRanD pRizeLime—Mixlimeasdescribedin
No.4,above.Mixfinishplasterinproportionsbydryweightof1partgaugingplasterto2partslime.Applyfinish
plasterasdescribedforReD topFinishPlaster.
�9 USGPlasterSystems
f. KeenesCementwithivoRy,SnowDRiFtorGRanD pRizeLimeforasandfloatfinish—MixlimeasdescribedinNo.4,above.
Mixfinishplasterinproportionsbydryweightto100lbs.KeenesCementPlasterto200lbs.limetonotmorethan800
lbs.ofsandaggregate.Applyfloatfinishcoatbyscratchingplasterinthoroughlyandimmediatelydoublebacktoatrue,
evensurface.Floatusingashingle,cork,wood,carpetorrubberfloattobringaggregatetothesurfacetoproducea
finishofuniformtexturefreeofslickspots,catfacesandotherblemishes.Usewatersparingly.
�.1� A. ColumnFireproofingInstallationSpecialApplications 1. ULDesignX518—2hour
Attachinnerlayer1/29impeRialBrandFiRecoDeCCoreGypsumBaseto1-5/89steelstudswith19type Sscrewsspaced
249o.c.andplaceassemblywithgypsumbasenexttocolumnflange.Installgypsumbaselayerverticallyaroundcolumn
using19type Sscrewstoattachbaselayertostudweb249o.c.andfacelayertostudflange129o.c.Applyfacelayer
verticallyoverwebfacesideofcolumnandfastenthroughbaselayertowebofstudswith1-5/89type Sscrewsspaced
129o.c.andstaggeredfromscrewsinbaselayer.Applycornerbeadatallcornersand1/169veneerfinish.
2. ULDesignsX521—2hourandX514—�hour
ForallW14x228steelcolumns,providefireprotectionwith1/29impeRialBrandFiRecoDeCCoreGypsumBaseapplied
verticallyover1-5/89steelstudspositionedatcorners.Attachbasetostudswith19type Sscrewsspaced129o.c.
For3-hourratinginstalladditionallayeroverwebsurfaceandattachtostudswith1-5/89type Sscrewsspaced
129o.c.Applycornerbeadatallcornersand1/169veneerfinish.
3. ULDesignX515—�hour
Attachinnerlayer1/29impeRialBrandFiRecoDeCCoreGypsumBaseto1-5/89steelstudswith19type Sscrewsspaced
129o.c.andplaceassemblywithgypsumbasenexttocolumnflange.Installtwoadditionallayerstostudflangeand
threeadditionallayerstostudweboverwebfacesideofcolumn.Fastenbaselayerswith19type Sscrews,middlelay-
erswith1-5/89screwsandfacelayerswith2-1/49screws.Spaceallscrews129o.c.vertically.Applycornerbeadat
cornersand1/169veneerfinish.
4. ULDesignX50�—4hour
ForallW14x228steelcolumns,providefireprotectionwithdouble-layer1/29impeRialBrandFiRecoDeCCoreGypsum
Baseappliedverticallyover1-5/89steelstudspositionedatcorners.Attachbaselayertostudswith19type Sscrews
spaced129o.c.andattachfacelayerwith1-5/89type Sscrewsspaced129o.c.andstaggered69frombaselayer
screws.Applycornerbeadatcornersand1/169veneerfinish.
5. ULDesignX524—2hour
Providefireprotectiontoallcolumnswiththreelayers1/29impeRialBrandFiRecoDeCCoreGypsumBase,screw-attached
to1-5/89steelstudspositionedatcolumncorners.Cutstuds1/29to3/49lessthancolumnheight.Forcolumnshaving
depthof369orless,applypanelsverticallyandstaggerjointsbetweenlayersatleast309.
Whencolumndepthexceeds369,installadditional1-5/89studsineachwebrecessinsideandalongcolumn
flangesandatthewebcenter.Setstudsinrunnersplacedhorizontally,paralleltowebbetweencolumnflangesand
spacedmax.88o.c.vertically.Fastenstudstorunnersattopandbottomwith1/29type S-12pan-headscrews.
Applygypsumbasehorizontallyandstaggerjointsbetweenlayersatleast129.
B. CagedBeamFireproofing
Positionceilingrunnersatleast1/29fromandparalleltobeam,andfastentofloorunitswith1/29type S-12panhead
screwsspaced129o.c.Fabricatehangerbracketsfrom1-5/89steelrunnersallowing19clearanceatbottomofbeam.
Spacebrackets249o.c.alongbeamandattachtoceilingrunnerswith1/29type S-12screws.Installlowercorner
runnersparalleltobeamandfastentobracketswith1/29type S-12screws.Screw-attach(two)(three)layersof5/89
�0 USGPlasterSystems
Application Guide Specifications
impeRialFiRecoDeCoreGypsumBasetochannelbracketsinstallingverticalpanelsfirst,withbottompanelsoverlapping
loweredgesofverticalpanelsineachlayer.Attachpanelstochannelbracketswith(19)(1-1/49)type Sscrews169o.c.
forbaselayer,1-5/89type Sscrews129o.c.formiddlelayer,and(1-7/89)(2-1/49)type Sscrews89o.c.forfacelayer.
For3-hourassembly,installwiremeshoverbottommiddle-layerpanel,extend1-1/29upeachsideandfastenwith
1-5/89screwsusedtofastenpanels.
C. SolidStudlessMetalLathPartition
Applyscratchcoattosideoppositebracing,andallowtosetandpartiallydry.Thenapplybrowncoattosideopposite
braces,allowingittosetthoroughlybeforeremovingtemporarybraces.Nextapplybrowncoattopreviouslybraced
sidetobringplasterouttogrounds.Straightentoatruesurfacewithrodanddarbywithoutuseofadditionalwater,
andleavesurfaceroughtoreceivefinishcoat.
D. SolidChannelStudMetalLathPartition
Applyscratchcoattolathsideandallowtosetandpartiallydry.Thenapplyback-upcoattochannelsidetofullgrounds,
1/29overchannels,innotlessthantwooperations;allowtoset.Applybrowncoatonlathsidetobringplasteroutto
grounds.Straightentoatruesurfacewithrodanddarbywithoutuseofadditionalwater,andleavesurfaceroughand
opentoreceivefinishcoat.
E. StRuctocoReSecurityWallSystem
SeeproductspecificationsinSA1119,Security Wall Systems.
F. Handball/RacquetballCourts
Seeproductdescriptions,technicaldata,andspecificationsinPM14.
G. PortlandCementBasecoats
ShallbeproportionedasspecifiedinSection2.9E,andappliedintwocoats.Rakescratchcoatperpendicularto
framing;afterset,damp-curefornotlessthan48hours.Damp-curebrowncoataftersetfornotlessthan48hours.
H. SteelDoorFrames
Groutallsteeldoorframeswithsandedplaster(seeGoodDesignPractices,No.2)insteelstudpartitionspriortolathing.
�.14 Executeornamentalplasterinaccordancewithscaledetailsshownonthedrawings.Runcornicesandmouldingsfull,Ornamental straight,andtruewithmouldingplaster,usingclean-cutmetalconformingtotheprofilesshownonthedrawings.AlignPlastering
linesaccuratelywithsquareintersections,andaccuratemitersatcornersandangles.Prepareenrichedornamental
workthatcannotberuninplacewithWhitehyDRocalGypsumCementcastingelatinmolds.Backtheworksolidly
withjuteorburlapandproperlyreinforcewithgalvanizedsteel.Makealljointscarefullyandpointneatlysoastobe
invisible.Sandpaperroughspotsandleaveentireworkreadyfordecoration.
�.15 Pointuparoundtrimandotherwork.Cutoutandpatchdefectiveanddamagedplaster.PatchplastertomatchPatching existingworkintextureandfinishflushandsmooth.
�.1� Atthecompletionofthefinishplasterwork,cleanallplasterfrombeads,screeds,metalbase,andmetaltrim,leavingCompletion workreadyfordecorationbyothers.Removeallplasterrubbish,excessmaterial,scaffolding,toolsandequipmentfrom
thebuilding,leavingfloorsbroom-clean.
About the cover:
Project
St. Ignacius
Seattle, WA
Recipient of the 1998 AIA Honor Award
Architects
Steven Holl Architects
New York, NY
Photographer
©Andy Ryan
Technical Service
800 USG.4YOUWeb Site
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888 874.2450Samples/Literature E-mail
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Manufactured by United States Gypsum Company550 West Adams StreetChicago, IL 60661
SA920/ECM/rev. 7-07© 2007, 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 Company or a related company: Acri-Add, Bridjoint, chAmpion, diAmond, durABond, durock, EAsy sAnd, FiBErock, FirEcodE, hydrocAl, impEriAl, rc-1, rEd top, rocklAth, shEEtrock, stAr, structo-BAsE, structocorE, structo-GAuGE, structo-litE and USG. BondcrEtE, GrAnd prizE, ivory, mortAsEAl and snowdriFt are trademarks of GemLime Group L.P. typE S and typE S-12 are trademarks of ITW Buildex. tyvEk is a trademark of DuPont. colortrEnd and AmBiAncE are trademarks of Creanova, Inc.
NoticeWe shall not be liable for inci-dental and consequential dam-ages, directly or indirectly sus-tained, nor for any loss caused by application of these goods not in accordance with current printed instructions or for other than the intended use. Our liability is expressly limited to replacement 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 geo-graphic markets. Consult your local sales office or represen-tative for information.Safety First!Follow good safety and indus-trial hygiene practices during handling and installation of all products and sytems. Take necessary precautions and wear the appropriate personal pro-tective equipment as needed. Read material safety data sheets and related literature on products before specifica-tion and/or installation.
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