Installation GuideCement Board

Lightest Cement Board

Easiest to Cut and Fasten

20% Faster Installation

1/2" and 5/8"Outstanding base for floors, walls, ceilings and countertops

1/4"Floors and countertops only (1/4" Durock® cement board is not for walls or ceilings)

Lighter. Easier. Faster.

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Formorethan25years,Durockcementboardhassetthestandardfor provenperformanceinthebackerboardcategory.Nowthisgreatproduct isevenbetter.ThenextgenerationofDurockcementboardnotonly continuesthebrand’straditionofqualityandreliability,butnowinstallsup to20%faster—andthatprovidesabigboosttoyourproductivity. Otherbenefitsinclude:

–Lightestcementboardforeasierhandling–Easiesttocutandfasten–30-yearwarranty

Waterdurableandmoldresistant,withbettertilebondthanfiber-cement boardsorbareplywood,Durockisanoutstandingbackerboardforawide varietyofmaterials.Choosethishighperformancealternativetofiber-cement boardsorbareplywoodsurfacesfor:

Superior Tile Bond Preventstilepopsandgroutcracks,upto40%greatertile bondthanfiber-cementboard.

The Strength of Portland Cement Willnotswell,soften,rot,warp,delaminateor disintegrateifexposedtowater.Noncombustible.Backedbya30-year limitedwarranty.

Superior Mold Resistance NomoldgrowthastestedperASTMG21.

Discover the Next Generation of Durock® Brand Cement Board

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What You’ll Need

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Requirements

Floors 1/4", 1/2", 5/8" thickness–Subfloorshouldbeminimum5/8" exterior-gradeOSBorplywood.

Countertops 1/4", 1/2", 5/8" thickness–Minimum3/4"exterior-grade plywoodbase.–CoverbasewithDurock™brand tilemembrane,15lb.feltor4-mil polyethyleneandattachwith1/4" galvanizedstaples.

Walls and Ceilings 1/2" and 5/8" thickness only–Maximumstudspacing:16"o.c. Maximumallowabledeflection, basedonstudpropertiesonly, L/360.Maximumfastener spacing:8"o.c.forwoodand steelframing;6"o.c.forceiling applications.

Waterproofing Ifwaterproofingisdesired,use Durocktilemembrane.SeeUSG literaturepieceCB492for Durock tilemembraneproduct information.

Cutting Durockpanelsshouldbecutto sizewithaknifeandstraightedge. Apowersawshouldbeused onlyifitisequippedwithadust collectiondevice.Alwaysweara NIOSH/MSHAapprovedmaskand eyeprotectionwhencutting Durockpanels.–Utilityknife:Usingastraight edge,scorepanelfacewith utilityknifeandcutthrough glass-fiberreinforcingmesh, thensnapandcutbacksidemesh tobreakcleanly.Usearaspto smoothanyroughedges.

–Powersaw:Usealow-RPM portablesawwith3-1/2" carbide-tippedblade.Tomake cutoutsforpipesandfixtures, useutilityknifetocutthrough meshonbothsidesofpaneland punchoutwithahammerfrom backside.Or,useanelectricdrill withahole-sawbit.

WARNING:Dustcancontainsilica. Prolongedbreathingcancause lungdamageandcancer.See MSDSformoreinformation.

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Positioning Fitendsandedgesofpanels closelybutnotforcedtogether, maintaining1/4"spacebetween panelsandperimeterwalls. Staggerjointsaminimum16" sothatfourcornersnevermeet. Offsetpaneljointsaminimum8" fromsubfloorjoints.

Leveling Bed Applytype1organicadhesivewith 5/32"v-notchedtrowel,latex- fortifiedmortarwith1/4" square-notchedtrowel.Combout adhesiveormortarinstraight, parallelrows(asshownbelow) andimmediatelycoverwithpanel. Adherepanelstosubfloor,one panelatatime.

Fastening Securepanelswhileadhesiveis stillwet.Spacefasteners8"o.c. aroundtheperimeterandinthe fieldoftheboard.

Woodframingandcountertops: fastenwith1-1/2"11-gaugehot- dippedgalvanizedroofingnails, orDurock™brandtilebacker screwsforwoodframingor 1-1/4"Durock tilebackerscrews forwoodframingorequivalent.

Joining Filljointswithlatex-fortified mortarorType1organicadhesive andimmediatelyembedalkali- resistant,fiberglassmesh jointtape.

Finishing Tileoralmostanyflooring material.*

* Notforusewithvinylflooring.

Floor Installation1/4", 1/2", 5/8"

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Countertop Installation1/4", 1/2", 5/8"

Wall and CeilingInstallation1/2" & 5/8" only

–CoverplywoodbasewithDurock

tilemembrane,15lb.feltor4mil polyethyleneandattachwith1/4" galvanizedstaple.

Position Fitendsandedgesofpanels closelybutnotforcedtogether. Staggerpaneljointsfromplywood basejoints.

Fasten Spacefasteners8"o.c.around theperimeterandinthefieldof theboard.

Joining Filljointswithlatex-fortified mortarorType1organicadhesive andimmediatelyembedalkali- resistant,fiberglassmeshjoint tape.

Finish Installtile.

Note: Becausecementboardfasteners mayprotrudethroughtheplywood basewhen1/4"cementboardis used,1/2"or5/8”cementboard ispreferredinthisapplication.

Fastening Fastentostudsspaced16"o.c. Spacefasteners8"o.c.forwalls, 6"o.c.forceilings.Fitendsand edgesofpanelscloselybutnot forcedtogether.–Woodframing:1-1/2"hot-dipped galvanizedroofingnailsor1-1/4" Durocktilebackerscrewsfor woodframingorequivalent.–Steelframing:1-1/4"Durock™

brandtilebackerscrewsforsteel framingorequivalent.

Joining Filljointswithlatex-fortified mortarorType1organicadhesive andimmediatelyembedalkali- resistant,fiberglassmeshjoint tape.

Shim Placea1/4"spacerstriporshim aroundlipofbathtuborshower pantoholdbottomedgeofpanel offthefixture.

Finish Installtile.

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Wheretilewillnotcoverentirewall surface,suchasabovetuband showersurrounds,determine whereyouwantthetiletoendand drawalevellineatthisheight.Be suretoallowforheightoftilecap, ifapplicable.

Onwallswheretilewillreachthe floor,determinewhetherflooris levelbymeasuringdistanceto desiredtileheightonbothsidesof areatobetiled.Ifthereisadiffer- ence(e.g.,thefloorisloweronone side),layoneverticalrowoftile fromhighestpointdowntofloor. Affixtileswithdabsofmastic.

Usethisfirstrowasaguideto keeptilesandgroutlinesleveland ensurealignmentwithtilesof adjacenttuborshowersurround. Ifnewflooringwillbeinstalled, leaveasufficientgapbetween lowesttileandsubfloor.

Onbathroomfloors,startby placingfulltilesinfrontofbathtub orshowerandalongtheadjoining walltoavoidcuttilesinthishighly visiblearea.

Planning YourTile Installation1/2" & 5/8" only

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Installing Ceramic Tile

Applylatex-fortifiedmortaror Type1organicadhesivewitha notchedtrowel.Holdtrowelat anangletomaintainuniform thickness.Refertosettingmaterial manufacturerforspecific informationrelatedtotroweltype andsize.

Workingasmallareaatatime, presstileintoplacewithaslight twistingmotiontoseatproperly. Preventadhesivebuildupon tileedgeandingroutspace. Ifadhesivesqueezesfromunder tile,removeexcessbeforeitdries.

Keeptilesandjointsstraight anduniform.Usetilespacers ifdesired.

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NoteProductsdescribedheremaynotbeavailableinallgeographicmarkets.ConsultyourUnitedStatesGypsumCompanysalesofficeorrepresentativeforinformation.

NoticeWeshallnotbeliableforincidentalandconsequentialdamages,directlyorindirectlysustained,norforanylosscausedbyapplicationofthesegoodsnotinaccordancewithcurrentprintedinstructionsorforotherthantheintendeduse.Ourliabilityisexpresslylimitedtoreplacementofdefectivegoods.Anyclaimshallbedeemedwaivedunlessmadeinwritingtouswithinthirty(30)daysfromdateitwasorreasonablyshouldhavebeendiscovered.

Safety First!Followgoodsafety/industrialhygienepracticesduringinstallation.Wearappropriatepersonalprotectiveequipment.ReadMSDSandliteraturebeforespecificationandinstallation.

WARNING!Dustcancontainsilica.Prolongedandrepeatedbreathingofsilicadustcancauselungdamageandcancer.Ifcuttingwithapowertool,useawetorvacuumsawtoreducetheamountofdustgenerated.Dustcanbecorrosivetoeyes,skin,andrespiratorytract.Contactcancauseseverechemicalburns.Weareye,skinandrespiratoryprotection.Ifeyecontactoccurs,flushimmediatelywithwaterfor30minutes.Ifingested,callphysician.Productsafetyinformation:800-507-8899orusg.comCustomerService:800USG-4-YOU(800874-4968).

For warranty or productinformation and literature:800USG.4YOU(874-4968)

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