plaster systems brochure sa920 - cs stucco and plaster: north

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


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


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



–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)


–RefertoproductsubmittalsheetF218formoreinformation

impeRial®BrandGypsumBase

–Solidgypsumlathinlarge,drywall-sizedsheets,withbluefacepaper,designedforveneerplastersystems

–Inone-coatveneerapplications,onlyimpeRialandDiamonDFinishPlasterscanbeusedoverimpeRialBrand

GypsumBase

–impeRialBrandFiRecoDeGypsumBase,impeRialBrandFiRecoDeCCoreGypsumBase,impeRialBrandAbuse-Resistant

GypsumBaseorimpeRialBrandultRacoDe®CoreGypsumBasecanalsobeused


Monolithic MonolithicConcrete




–Two-coatveneerrecommended

UnitMasonry

–Mayserveassubstrateforatwo-coatveneersystemoninteriorwalls



–Concreteblockshouldbenewandunpainted,jointsstruckflush


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


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


Red topBrandGypsumPlaster

–Generalpurposebasecoatplasteravailableindifferentformstosuitregionalpreferences

–Requiresaddingaggregateandwateronthejob


Red topBrandWoodFiberPlaster

–Agypsumplastercontainingfineparticlesofselectedwoodfiber

–Recommendedasascratchcoatformetallath,butcanbeusedonallstandardlathsandmasonry

–100lbs.ofsandper100lb.ofplastermustbeaddedwhenmachineappliedoruseddirectlyonmasonry

–Aggregateadditionisoptionalwhenappliedovermetallath


Components


StRucto-baSe®GypsumPlaster

–Developshigherstrengths(2,800psi)thanconventionalplasters

–Forsecuritywalls,handballcourts,hospitalcorridors,high-performancesuspendedceilingsystems,schoolsand

wherevertheultimatecompressivestrengthplasterisnecessary

–Requiresadditionofaggregate


StRucto-lite®GypsumPlaster

–Mill-mixed,perlite-aggregatedplasterrequiresonlytheadditionofwateronthejob

–Lessthanhalftheweightofasandedbasecoat,butprovidesthreetimestheinsulationvalue(k=1.74)

–Masonryforunitmasonryonly(highsuction)


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)


impeRialBrandFinishPlaster

–Providesthehigheststrength(3,000psi)andthemostabrasion-resistantsurfaceofanyplasterfinish

–CanbeusedoverimpeRialBrandGypsumBaseinone-coatveneerplastersystems,overimpeRialBrandBasecoat

Plasterintwo-coatveneerplastersystems,asthefinishoverDiamonDBrandVeneerBasecoatorasthefinishina

two-coatveneerplastersystemoverDuRockBrandCementBoard

–Requiresonlytheadditionofcleanwater

–Notrecommendedforuseoverlightweightgypsumbasecoats


Red topBrandFinishPlaster

–Aneasy-workingmill-mixedgaugedplaster-limefinishforhighproductivity

–Excellentsmoothnessandtrowelingcharacteristics


PlasterFinishes AnyproperlypreparedconventionalplasterfinishmaybeappliedoverimpeRialBrandorDiamonDBrandVeneeroverVeneer Basecoat.Thissolutionoffershigherproductivity,easeofapplication,asmoothsurface,andawiderangeoftexturingBasecoats

options.Recommendedforlargecontinuoustexturedsurfacesorintegralcoloredfinishes.

GaugingPlasters

Speciallypreparedgypsumplastersdesignedtobemixedwithlimeputtytoproduceafinishplaster.Gaugingplasters

providepositivesetandstrengthtothefinishplaster.Theycanalsobeaggregatedfortexturing.

Red topBrandGaugingPlaster

–Agraytopinkplaster(dependingongypsumrocksource)

–AvailableinRegular(unaggregatedforsandedbasecoats)andQuality(withperliteorsandfines)forlightweightbasecoats


Components


Red topBrandKeenesCement

–Ahighlycalcined(“dead-burned”)gypsumgaugingplasterthatcanberetemperedonceduringapplication

–Idealforfloat-finishesandjobcoloring

–Extensivetrowelingnecessarytoattainstrength,surfacehardnessandimprovedresistancetoabrasion


StaRandchampionWhiteGaugingPlasters

–Whitegaugingplasterinquick-set(champion)andslow-set(StaR)formulations

–AvailableinRegular(unaggregatedforuseoversandedbasecoats)andQuality(aggregatedwithmill-mixedfine

aggregatesforuseoverlightweightbasecoats)


StRucto-GauGeGaugingPlaster

–Apremiumgaugingthatprovidesgreaterstrength,hardness,andresistancetosurfaceabrasionthanstandard

gaugingplasters

–Useonlyoverhigh-strengthbasecoats

–AvailableinQuick-SetandSlow-Setformulations


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


StaRandchampionWhiteGaugingPlasters

–Whitegaugingplasterinquick-set(champion)andslow-set(StaR)formulations

–AvailableinRegular(unaggregatedforuseoversandedbasecoats)andQuality(aggregatedwithmill-mixedfine

aggregatesforuseoverlightweightbasecoats)


StRucto-GauGeGaugingPlaster

–Apremiumgaugingthatprovidesgreaterstrength,hardness,andresistancetosurfaceabrasionthanstandard

gaugingplasters

–Useonlyoverhigh-strengthbasecoats

–AvailableinQuick-SetandSlow-Setformulations


Finishing Limes

Whenfinishlimesaremixedwithwateronthejob,theresultislimeputty(acomponentoffinishplasters).Limeputty

addsplasticitytothefinishplaster,improvingworkabilityandsurfacesmoothness.

GRand pRizeSingleHydrateFinishLime

–Single-hydratelimerequiresovernightsoakingbeforeblendingwithgaugingplaster

ivoRyandSnowdRiFtFinishLimes

–Autoclaveddoublehydratelimevirtuallyeliminatespossiblefutureexpansioninthefinishcoatfromunhydrated

magnesiumoxides

–Noslakingrequired


Special Interior Plasters

USGAcousticalPlasterFinish

–Attractivesprayplastertextureforapplicationtogypsumbasecoats,interiormonolithicconcrete,metaldecksand

gypsumpanelceilings

–Foruseonnewconstructionorrenovation,noncontactsurfaces

–Surfaceburningcharacteristics:flamespread10,smokedeveloped25

–SoundratedNRC0.55forconcreteandconventionalplasterat1/29finishthickness;NRC0.75forconcreteand

conventionalplasterat19finishthickness;NRC0.50forgypsumpanels


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


–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


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




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


impeRialBrandTape

–Highlycrack-resistantglassfibertape

–DesignedtoreinforcejointsofimpeRialBrandGypsumBaseoverwoodframingonly

–Openweaveallowsforcompleteencasementduringembedding

–Availableinpressuresensitive(P)andstaple-attached(S)


FramingandFurringAccessoriesandScrews


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


impeRialBrandTape

–Highlycrack-resistantglassfibertape

–DesignedtoreinforcejointsofimpeRialBrandGypsumBaseoverwoodframingonly

–Openweaveallowsforcompleteencasementduringembedding

–Availableinpressuresensitive(P)andstaple-attached(S)


FramingandFurringAccessoriesandScrews


Components


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



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


1/2",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


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


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.


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.


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.


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.


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.


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.


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.


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



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



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


35⁄8"

Baseeachside orU412 –1-5/8925gaugesteelstuds249o.c. –facelayerjointsfinished •optionalveneerplaster






wt.11 •5/89impeRialBrandFiRecoDeCoreGypsum ULDesU419 SA920 1�

5"

Base,orFibeRockBrandPanels orU411 –1-5/8925gaugesteelstuds249o.c. –facelayerjointsfinished •optionalveneerplaster


55⁄8"

Base orU45� –3-5/8920gaugestuds249o.c. –39theRmaFibeRSAFB –RC-1channelorequivalentonesidespaced

249o.c. –single-layergypsumpanelsscrew-attached

tostuds –doublelayerscrew-attachedtochannel –facelayerjointsfinished •optionalveneerplaster


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


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







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


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


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



1HourFire-ratedConstruction Loadbearing AcousticalPerformance Reference


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


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


Wood FramedPartitions

1HourFire-ratedConstruction Loadbearing AcousticalPerformance Reference


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


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"



Furred PartitionsPartitions

�HourFire-ratedConstruction AcousticalPerformance Reference


•1/29impeRialBrandFiRecoDeCCoreGypsum ULDesU914 SA920 �� Base –concreteblock(ULClassified) –7/89deepmetfurchan249o.c. –jointsfinished •optionalveneerfinish


•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


clg.wt.4 •5/89ReD topBrandGypsumPlaster,sanded GA-FC-1180 SA920 �5 1:2-1:3 –3/89riblathmetallath –29concreteonriblathoverjoist –steelbarjoists249o.c.


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


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



Steel FramedFloor/Ceilings

�HourFire-ratedConstruction SteelBarJoistFraming AcousticalPerformance Reference


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


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"


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






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"





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"



Steel FramedRoof/Ceilings

1-1/2HourFire-ratedConstruction SteelBarJoistFraming AcousticalPerformance Reference


clg.wt.4 •USGDGLDrywallSuspensionSystem ULDesP510 SA920 5� •5/89impeRialBrandFiRecoDeCCore GypsumBase –jointsfinished –min19roofinsuland5/89gypsumboardon steeldeck •1hr.ratingbasedonassemblywith 1/29SheetRockBrandFiRecoDeCCore GypsumPanels –steelbarjoists •optionalveneerplaster

271⁄4"


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"



ColumnStructural Fireproofing

�HourFire-ratedConstruction Reference


–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


–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"


BeamStructural Fireproofing

�HourFire-ratedConstruction Reference


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


–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


–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


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


steelstuds

locatejambanchorsasrequired–onstrikesidetooccurdirectlyoppositehingeside

runnerfastenedwithscrewstostuds

flooranchorssecuredwithminimumoftwofasteners

cripplestud1/2"min.clearance

Note:SeeUSGtechnicalliteratureforreinforcingrequirementsofdoorsover50lb.andupto200lb.

Steeldoorframe

Elevation

Conventional Plaster Systems

CeilingAttachment SteelDoorFrame

Jambs–StandardDoors


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


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


Design Details

Veneer Plaster Systems

WallPlan CeilingAttachment

PlasterChalkboard PerimeterRelief–CeilingIntersection PerimeterReliefandControlJoint


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


3/8"

21/2"

1/2"

screw

steelstud

steelrunner


veneerfinish

Perimeterreliefceilingintersection

SHEETROCKBrand701-Bmetaltrim

SHEETROCKBrandzinccontroljointno.093

4"max.

Perimeterreliefandcontroljointwallorcolumnintersection

3/8"



gypsumbasejoint

1"drywallscrew

SHEETROCKBrandno.800orno.900cornerbead

SHEETROCKBrand701-AorBmetaltrim

steelstud steelstud

Partitioncorner

Wallplansections

Intersection

2"min.6"max. SHEETROCKBrand

jointtapecornerreinforcement

Partitioncorner Intersection

Wallorcolumnintersecion


WallPlanSections

CeilingAttachment

adjustablebracket


SHEETROCKBrandzinccontroljountno.093

SHEETROCKBrandjointtape

mineralfiberinsulation

steelstud

2"max.

steelstudsingle-layerIMPERIAL

Brandgypsumbase

double-layer(laminated)IMPERIALBrandgypsumbase

double-layerIMPERIALBrandgypsumbase

IntersectionPartitionterminal Outletbox Wallcontroljoint

Wallplansections



1/2"min.

RC-1resilientchannelorequivalentspaced16"or24"o.c.andatceilings




1/2"

RC-1resilientchannelorequivalent(maybeinvertedtoeaseattachmentofbase)

Ceilingattachment

Floorattachment


veneerfinish

THERMAFIBERSAFB

2x4woodstud

resilientchannel

resilientchannel




1/2"


Ceilingattachment

Floorattachment


veneerfinish

THERMAFBERSAFB

2x4woodstud

Partitionterminal Outletbox Wallcontroljoint Intersection

Floorattachment Floorattachment



Design Details


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


CeilingAttachment

GrillageSuspension WallIntersection ControlJoint

SHEETROCKBrandjointtreatment

11/2"channel


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




1/2"


Ceilingattachment

Floorattachment


veneerfinish

THERMAFIBERSAFB

2x4woodstud

Note:Ifpartywall,extendboardflushtoceiling

extrachannelrequiredforcabinetsover24"high

11/4"typeWscrew

1/2"IMPERIALBrandgypsumbase

centerhangersoverRC-1resilientchannelorequivalent

1"typeSscrew

2x2woodsoffitframe


cabinethangerstrip

21/4"TYPESscrew(locatescrewsbetweenstuds)

Ceilingattachment



Design Details


WallControlJoint

ExteriorCornerFraming Jamb

doubleZ-furringchannels

Jamb

SHEETROCKBrandZ-furringchannels

sealant metaltrimorSHEETROCKBrandzinccontroljointno.093

1/4"min.

Wallcontroljointsteelstudsetinrunner

SHEETROCKBrandZ-furringchannels

3/8"TYPESpanheadscrew–24"o.c.


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


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



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.


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.


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.


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.


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.


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. 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


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).



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.


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).



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


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.



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.


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.



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.


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


2. GRand pRizeLime


3. FinishPlaster

Shallbemixedinproportionbydryweightof______partsofgaugingto________partsoflime(specifyfrom

coveragedata),accordingtoapplicablebagdirections.Overlightweightaggregatebasecoats(suchasStRucto-lite

GypsumPlaster),add1/2cu.ft.ofperlitefinesor50lb.ofsilicasandtomeetASTMC35per100lb.ofgaugingplaster

orusemill-aggregatedgaugingplaster.



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.)


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


3. GRand pRizeorRed topLime




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.


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



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

usg.comSamples/Literature

888 874.2450Samples/Literature E-mail

[email protected]/Literature/Fax

888 874.2348Customer Service

800 950.3839

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.

plaster systems brochure sa920 - cs stucco and plaster: north

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