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Section 6.0Fire Protection
Structural steelwork
Product: Knauf Fireboard
Fp01
Small cavity barriers
Product: Earthwool Cavity Barrier
Mezzanine floors
Product: Rocksilk FireTech Slab
Fp03
Fp04
Structural steelwork
Product: Rocksilk FireTech Slab
Fp02
Large cavity barriers
Product: Rocksilk Smoke and Fire Barrier
Fp05
Refurbishment of timber separating/internal floor
Product: Earthwool Flexible SlabFp06
Steel Duct Encasement
Product: Rocksilk Pyroduct Slab
Fp07
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Fire protection of structural steelFire protection design
• Canbeinstalledpriortothebuildingbeing sealedandmadewatertight,inall temperatureandhumidityconditions–this isincontrasttopaintandsprayswhichare oftenrestrictedbynormalUKwinter conditions,causingpotentialdelayto siteprograms
• Arefast,clean,anddrytoinstall,with negligibledustlevels,allowingothertrades toworkincloseproximity
• Arequickandeasytocheck(byvisual inspection)thatallrelevantareashave beenprotected
• Arefullycompatiblewithdryliningsystemsandalloweasyintegrationwithpartitioningschemes
FireprotectionAnysteelsectionwhichisanelementofstructureandisdeemedbyanyofthefollowingregulationstorequirefireresistancecanbeprotectedwithafireprotectionsystemofdenserockmineralwoolslabsorfibrereinforcedgypsumbasedboards.
1.TheBuildingRegulations(EnglandandWales)ApprovedDocumentB(FireSafety)–Volumes1and2(2006)
2.TheBuilding(Scotland)Regulations, TechnicalBooklets,Section2,2011
3.TheBuildingRegulations(NorthernIreland) TechnicalBookletE,2005
4.TheBuildingRegulations(RepublicofIreland) TechnicalGuidanceDocumentB(2006)
Structuralsteelrequiresfireprotectionbecauseitlosesstructuralstrengthattemperaturesthatcanberapidlyreachedinabuildingfire.Thiswillconsequentlyhaveanegativeimpactonthestructuralintegrityofthebuilding.Protectingthestructuralsteelfromtheheatofafirewilldelaytheonsetofthislossofstrengthandthepossiblecollapseofthebuilding.Thisisessentialbecauseitallowsextratimeforboththeoccupantsofthebuildingtoescapeandfireservicestotacklethefire.Itcouldalsopreventtheactualcollapseofthebuildingminimisinginsurancelosses.BuildingRegulationscoveringfiresafetyareconcernedwiththepreservationoflife.
Withtheincreasinguseofstructuralsteelinconstruction,designersneedfireprotectionsolutionsthatprovideacombinationoffastinstallationandcost-effectivenesswhilstachievingthedesiredfinish.
WhatevertheapplicationKnaufInsulationhasarangeofboardproductsandsystemstocaterforanyproject.
Whenusedforthefireprotectionofstructuralsteelwork,boardsystemsofferseveralcompellingadvantagesoversiteappliedpaintandspraycoatingsystems.
Boardsystems:
•Aremanufacturedtofactorytolerances–this enablesthespecifiertobecertainthatthe correctthicknessoffireprotectionisbeing applied,bysimplycheckingthethicknessof materialssupplied
5.LossPreventionCouncilCodeofPracticefor ConstructionofBuildings
Steelsectionscanincludeuniversalbeams,columnsandjoists(plainandcastellated),structuralandrolledtees,angles,channelsandround,squareorrectangularhollowsections.
BenefitsBothrockmineralwoolslabsandfibrereinforcedgypsumboardsofferanumberofadvantagesforthefireprotectionofstructuralsteelworkthatmakethemidealforfasttrackprojects.
Rock mineral wool• Lightweightproduct–atlessthanhalfthe weightofcalciumsilicateslabs–rock mineralwoolfireprotectionboardsareeasy tohandleandfitonsiteparticularlyfor overheadwork
• Easeofcuttingandfixing:Rockmineralwoolslabsareeasytocutwitheitherasawora sharpknife,furthermoretherearefourfixing methods,allinvolvesquareedgebuttjoints betweentheboardswhichenablesafastand simplesystemtobeinstalledwithoutdelaying othertradesandactivities
Fibre reinforced gypsum•Smoothsurface–onlyrequiresdecorative finishesforcompletion
•Robustandimpactresistant–idealfor columnsandallexposedsurfaces
•Easytocuttosize–canbescoredand snappedtospeedupcuttingandreduce dustlevels
KnaufInsulationaremembersoftheAssociationforSpecialistFireProtection,andourfireprotectionproductsarelistedintheYellowBook,whichpresentseconomicalmethodsforthefireprotectionofstructuralsteelworktoprovidecompliancewithBuildingRegulations
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Fire protectionSolution optimiser and pathfinder
Fireprotection
Period of fire resistance (mins)
Knauf Insulation solution
Mezzanine floorsProduct:RocksilkFireTechSlab
Seepage:280
0 mins 30 mins 60 mins 90 mins 120 mins 150 mins 180 mins 210 mins 240 mins
Fp03
Key
Findonline.Visitknaufinsulation.co.ukandkeyinconstructioncodetofindthe
mostuptodateinformationonyourchosensolution.Pb01
Fp04
Large cavity barriersProduct:RocksilkSmokeandFireBarrier
Seepage:286
Fp05
Refurbishment of timber separating/internal floorProduct:EarthwoolFlexibleSlab
Seepage:292
Fp06
Steel Duct EncasementProduct:RocksilkPyroductSlab
Seepage:294
Fp07
Structural steelworkProduct:RocksilkFireTechSlab
Seepage:274
Structural steelworkProduct:KnaufFireboard
Seepage:268
Fp01
Fp02
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Fire protectionStructuralsteelwork
Knauf Fireboard
Typical constructionKnaufFireboardisusedinframelessencasements.Theproducthasbeenspeciallydevelopedtoacceptdirectedgefixings.CasingsconsistofKnaufFireboardscrewedorstapledtoitselfatabuttingcorners.
Forsteelworkencasedonallfoursides,KnaufFireboardisfixedateachcornerdirectlythroughthematerial,independentofthecolumnorbeam.Forpartialencasement,involvingwallorceilingabutments,KnaufFireboardisfixedtolightgaugesteelangles.
KnaufInsulationrecommendtheuseofKnaufDrywallScrews,essentialforfastconstruction,solidfixingandtightlyclosededgejoints.
ProductsKnauf Fireboardisagypsumbasedboardspeciallydevelopedforhighperformanceliningandencasement,providinguptotwohoursoffireprotection.
KnaufFireboardhasahighqualitywhitesmoothsurfacefinishideallysuitedasaselffinish.Itssurfaceallowsdirectdecorationwithmostpaintfinishesoritcanbeplastered*.
Knauf Drywall Screwsaregoldpassivatedscrewswithspoontipsand‘hi-low’threads.
KnaufFireboardcanalsobeinstalledusingproprietarystaples.
*Consultplastermanufacturerpriortoapplicationofplasterfinish.
Fp01• Quickandeasytoinstall
• Dryfixsystemprovidingupto2 hours fire protection
• Combinedfireprotectionand aesthetic finish
Knauf Fireboard
• Non-combustiblewithaEuroclass A1 reaction to fire rating
• ZeroOzoneDepletionPotential(ODP)
• ZeroGlobalWarmingPotential(GWP)
EdgefixtheboardsusingeitherKnaufDrywallScrewsatmaximum150mmcentresorproprietarystaplesat120mmcentres.
KnaufFireboard
KnaufDrywallScrewsatmaximum100mmcentresintobackingstrips
Abutmentangles:lightgaugesteelangleprovidessupportatsoffitandwalljunctions.Fixedtoadjoiningsoffitorsectionflange.
REFURBNEW BUILD
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TypicalspecificationKnaufFireboard,...…mmthick,tobeusedtoprovidefireprotectiontostructuralsteelwork.
Itistobeinstalledonbeam*/column*asacomplete4sided*/3sided*/2sided*encasement(*specifier’schoice)toprovide......minutesfireprotectionasdetailedintheInstallationsection.
Alternatively,consulttheNationalBuildingSpecifications,Standardversionclause/clauses…K10/265……………
KnaufInsulationspecificationclausescanbedownloadedfromknaufinsulation.co.uk/nbs
PerformanceFire performanceThesystemcanprovideupto2hoursfireprotection.Forprecisecalculationoffireprotectionperiods,pleasecontactKnaufInsulationTechnicalAdviceandSupportCentre.
KnaufFireboardisnon-combustibletoBS476:Part4:1970(1984)andClass1surfacespreadofflametoBS476:Part7:1997.KnaufFireboardcomplieswiththeClass‘0’requirementsoftheBuildingRegulationswhentestedtoBS476:Part6:1989andPart7:1997andwiththelimitedcombustibilitydescribedintheBuildingRegulations.
Humidity Constanthumidityover95%orsubjectiontocontinuouswaterwillreducetheserviceabilityoftheboards.
OperatingtemperaturesContinuouslongtermexposuretotemperaturesover50ºCcaninduceachangeofstatewhichwouldreducethephysicalperformanceandserviceabilityoftheboards.
Health and safetyKnaufFireboardmustbeinstalledwithcare.Ensureadequateventilationduringinstallation,particularlywhencuttingboards.Avoidharshbodycontactwithsharpcutedgesofmetalcomponents.RefertoKnaufInsulationMaterialSafetyDataSheetsandtotheHealthandSafetyExecutivepublications.
ForHp/Atablespleasevisitknaufinsulation.co.uk
KnaufFireboardcasing
Staggerjointsby300mmminimum
Directedge-fixingwithKnaufDrywallScrewsat200mmcentresorproprietarystaplesat120mmcentres
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1 2 Holdinplacethe first2boards
withclamps.3 Aftermeasuringthe
sizeoftheremaining2sides,cutanothertwotothedepthofthecolumnplustwicethethicknessoftheboard.
4 Applytheremainingboards,adjustingthelengthofadjoiningboardstoensurethatboardjointsarestaggeredbyatleast300mm.
5 Edge-fixtheboards usingeitherself drillingKnauf FireboardGripper Screwsat200mm centresorproprietary staplesat120mm centres.Knauf FireboardGripper Screwsshould penetrateintothe casingbyatleast 30mm
Installationsequence
Fire protectionInstallation of column system
Partial column encasementAssumingatypicalthree-sidedencasementwhereoneofthecolumnflangesstraddlesawall,followthesameprocedureasoutlinedforfour-sidedencasementwiththefollowingdifferences:
•Fix25x25mmlightgaugesteelangles,incontinuouslengths,toeithertheabuttingwallfaceortheinnerflangeofthecolumn.Useappropriateproprietaryfixingsat600mmcentres
Double layer applicationInstallthefirstlayerasdescribedforeitherfullorpartialencasement.Securethesecondlayertothefirstwithfixingsspacedasforthefirstlayerbutavoidcoincidentfixingpositions.
Itisgoodpracticethatboardjointsarestaggered–aswiththefirstlayer–betweenadjoiningboardsandalsobetweenthetwolayers.Inthecaseofstructuralsteelwork,doublelayerencasementwillobviatetheneedforjointbackingstrips.
InstallationSteelworkencasementsmustbeinstalledinfullaccordancewithKnaufInsulation’srecommendationsandincompliancewithBS8212:1995andBS8000:Part8:1994.Theinstallationproceduresoutlinedhererelatetonormalsinglelayerapplications.
Knauf Drywall ScrewsKnaufDrywallScrewsshouldpenetrateintothecasingbyatleast30mm.
Four-sidedcolumnencasement•Cuttwoboardstothewidthofthecolumnflange.Cutanothertwotothedepthofthecolumnplustwicethethicknessoftheboard
•Adjustthelengthofadjoiningboardstoensurethatboardjointsarestaggeredbyatleast300mm
•Edge-fixtheboardsusingeitherKnaufDrywallScrewsat200mmcentresorproprietarystaplesat120mmcentres
Cuttwoboardsto thewidthofthecolumnflange.
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Fire protectionInstallation of beam system
Beam encasementAssumingatypicalthree-sidedencasement,whereabeamisexposeddirectlybelowalevelsoffit,fixlightgaugesteelanglestoeithertheadjoiningsoffitorthetopflangeofthebeam.Installcontinuouslengthsof25x25mmangleusingappropriateproprietaryfixingsat600mmcentres.
•Fixfurtherlengthsof25x25mmangleatanyendabutment
•Cuttwoboardstothedepthofthesectionplustwicethethicknessoftheboardplusl0mm.Screw-fixthesetotheanglesat150mmcentreswith35mmKnaufDrywallScrews
•Cutasoffitboardtothewidthofthesteelflange.Thelengthofthisboardmustdifferfromthesideboardstoensureadjacentboardjointsarestaggeredbyatleast300mm.Edge-fixthishorizontalboardtothetwoverticalboardsusingeitherself-drillingKnaufDrywallScrewsat150mmcentresorstaplesat120mmcentres
•Cutboardoff-cuts100mmwideasjointbackingstrips.Fitthese,half-lapped,behindallbuttjointsatthesidesandsoffitofthebeamfixedwithKnaufDrywallScrewsatmaximum100mmcentres
Double layer applicationInstallthefirstlayerasdescribedforeitherfullorpartialencasement.Securethesecondlayertothefirstwithfixingsspacedasforthefirstlayerbutavoidcoincidingfixingpositions.
Itisgoodpracticethatboardjointsarestaggered–aswiththefirstlayer–betweenadjoiningboardsandalsobetweenthetwolayers.Inthecaseofstructuralsteelwork,doublelayerencasementwillobviatetheneedforjointbackingstrips.
Thesecondlayerofboardsacrossthewebsarefixedtotheangleattachedtotheupperflangeusing55mmlongKnaufDrywallScrewsat150mmcentresandthesecondlayeracrossthebottomflangeusingKnaufDrywallScrewsat
Installationsequence
1 Installcontinuouslengthsof 25x25mmangleusing
appropriateproprietary fixingsat600mmcentres,fix furtherlengthsof25x25mm angleatanyendabutment.
2 Cuttwoboardstothedepth ofthesectionplustwicethe
boardthicknessplusl0mm.
Screw-fixthesetotheanglesat150mmcentreswith
35mmKnaufDrywall Screws.
3 Cutasoffitboardtothe widthofthesteelflange.
Thelengthofthisboardmust differfromthesideboardsto ensureadjacentboardjoints arestaggeredbyatleast 300mm.
Edge-fixhorizontalboardtothetwoverticalboardsusing
eitherKnaufFireboard GripperScrewsat150mm centresorproprietarystaples at120mmcentres.
4 Cutboardoff-cuts100mm wideasjointbackingstrips.
Fitthese,halflapped,behind allbuttjointsatthesides andsoffitofthebeam.
FixwithKnaufFireboardGripperScrewsatmaximum
100mmcentres.
6.1
nominal150mmcentres,screwlengthsshouldbeequaltothethicknessofthesecondlayer,plus30mm.WheretwodifferentthicknessesofFireboardareapplied,thethickerlayerisinstalledfirst.
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Fire protectionApplication details for beams
25x25mmanglesecuredtotopflangeofbeam,oralternativelytosoffit
Beamwithpartitionabutment
Beamwithwallabutment
25x25mmanglesecuredtotopflangeofbeam,oralternativelytosoffit
KnaufDrywallScrewsatmaximum100mmcentres
Fireboardcasing
Backingstrip
10mmgap
DirectedgefixingwithKnaufDrywallScrewsatmaximum150mmcentresorstaplesat120mmcentres
C-StudpartitionwithstandardU-Channelheadtrack
KnaufDrywallScrewsatmaximum100mmcentres
Fireboardcasing
DirectedgefixingwithKnaufFireboardGripperScrewsatmaximum150mmcentresorstaplesat120mmcentres
Continuous25x25mmKnaufFireboardAnglesecuredtosubstrateusingappropriatefixings
Masonrywall
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Columnwithpartitionabutment
KnaufC-Studtoggle-fixedtoKnaufFireboardcasing
KnaufWallboardnotfixedtothisC-Stud
DirectedgefixingwithKnaufDrywallScrewsatmaximum200mmcentresorstaplesat120mmcentres
Continuous25x25mmKnaufFireboardangleateachcorner
KnaufWallboardnotfixedtothisC-Stud
DirectedgefixingwithKnaufDrywallScrewsatmaximum200mmcentresorstaplesat120mmcentres
Columnwithwallliningabutment
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Fire protectionStructuralsteelwork
Rocksilk FireTech Slab
NogginofRocksilkFireTechSlaborRocksilkFireTechDryFixNogginSlab
RocksilkFireTechSlab
InstallationRocksilkFireTechSlabcanbeusedwithfourtypesoffixingmethodsforthefireprotectionofstructuralsteelworkandeachsystemhasitsownperformancecharacteristics.
Fixingmethods:
•DryFixNogginSystem
•AdhesiveNogginFixingSystem
•CombinationFixingSystem
•WeldedPinFixingSystem
Typical constructionTheexposedsurfacesofanysteelsectionarefullyenclosedinRocksilkFireTechSlab,usinganyofthefixingsystemsshownonthefollowingpages.
RocksilkFireTechSlabcanbeusedtoprovideupto4hoursfireprotectiontostructuralsteelandcastironcolumns,beamsandtrusses.Steelsectionsmayincludeuniversalbeams,columnsandjoists(plainandcastellated),structuralandrolledtees,angles,channelsandround,squareorrectangularhollowsections.
Product Rocksilk FireTech Slabisadenserockmineralwoolslab.ItisavailableunfacedorfacedwithabrightClass‘0’reinforcedaluminiumfoil,forapplicationsabovecleanrooms,withinairplenums,orforaestheticpurposes.
Plastermanufacturersadviceandguidanceshouldbefollowedregardingpre-treatmentofRocksilkFireTechSlabsbeforeapplicationofplasterfinishes
RocksilkFireTechDryFixNogginSlabisanultrahighdensityrockmineralwoolslabusedforthenogginintheRocksilkFireTechDryFixNogginSystem.
Fp02• Flexiblesystemwithfourinstallation methods
• Maintenancefree,passivesystem
• Cleaninstallationprocesswith negligible dust generation
Rocksilk FireTech Slab
• Non-combustiblewithaEuroclassA1 reaction to fire rating
• ZeroOzoneDepletionPotential(ODP)
• ZeroGlobalWarmingPotential(GWP)
Pigtailscrews
REFURB
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TechnicalspecificationRocksilkFireTechSlab,...…mmthick,tobeusedtoprovidefireprotectiontostructuralsteelwork.
Itistobeinstalledusingthedryfixnogginsystem*/adhesivenogginfixingsystem*/combinationfixingsystem*/weldedpinfixingsystem*(*specifier’schoice)asdetailedintheInstallationsection.
Alternatively,consulttheNationalBuildingSpecifications,Standardversionclause/clauses…K11/885……………
KnaufInsulationspecificationclausescanbedownloadedfromknaufinsulation.co.uk/nbs
PerformanceFire performanceRocksilkFireTechSlabisclassifiedasnon-combustibletoBS476:Part4:1970(1984),Class1surfacespreadofflametoBS476:Part7:1997,andClass‘0’totheBuildingRegulations.RocksilkFireTechSlabisdesignedtoprovideupto4hoursfireprotectiontostructuralsteelwork,therebysatisfyingtheBuildingRegulationsandinsurancedemandsforperiodsoffireresistance.
DurabilityRocksilkFireTechSlabisrotproof,doesnotsustainverminandwillnotencouragethegrowthoffungi,mouldorbacteria.
RocksilkFireTechSlabisodourlessandnon-hygroscopic.
RocksilkFireTechSlabisnon-wickingwhentestedtoBS2972:1989:Section12.
Whenexposedto90%relativehumidityand20ºC,RocksilkFireTechSlababsorbslessthan0.004%ofmoisture.
ForHp/Atablespleasevisitknaufinsulation.co.uk
NogginofRocksilkFireTechSlaborRocksilkFireTechDryFixNogginSlab
PigTailScrews
RocksilkFireTechSlab
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Fire protectionInstallation of Rocksilk FireTech Slab
AdhesiveNogginFixingSystemUpto2hoursfireprotection
Attachwebpiecestonogginswithpigtailscrewsat100mmcentres.
DryFixNogginSystemUpto2hoursfireprotection
WeldedPinFixingSystemUp to 4 hours fire protection
CombinationFixingSystemUp to 3 hours fire protection
Attachwebpiecestonogginswithpigtailscrewsat100mmcentres.
Theuseofadenserockmineralwoolslabrequiresnospecialveecuts,drillingorsub-frames,makingitfastandeasytoinstall.Rockmineralwoolslabscanbeeasilycutusinghandorpowertools.
Note:RocksilkFireTechDryFixNogginSlabhasadensityof200kg/m3.
TheCombinationFixingSystemCanbeusedtoprovideupto2hoursfireprotectiontoallsizesofstructuralsteelwork,andupto3hoursfireprotectiontosteelworkwithsectionfactors(Hp/A)ofupto133m-1forcolumnsand143m-1forbeams.
TheWeldedPinFixingSystemCanbeusedtoprovideupto3hoursfireprotectiontoallsizesofstructuralsteelwork,andupto4hoursfireprotectiontosteelworkwithsectionfactors(Hp/A)ofupto172m-1forcolumnsand184m-1forbeams.
Ifsectionfactorsareabove260m-1contactourTechnicalAdviceandSupportCentre.
Alternative installation methodsTheDryFixNogginSystemIsafastandefficientfrictionfitnogginsystemthatdoesnotrequireadhesive.Itcangiveupto2hoursfireprotectiontoBS476:Part21.Wheninstalling20,25and30mmRocksilkFireTechSlab,nogginsshouldbecutfroma30mmRocksilkFireTechDryFixNogginSlab.WhengreaterthicknessesofRocksilkFireTechSlabareused,thenogginsarecutfromacorrespondingthicknessofRocksilkFireTechDryFixNogginSlab.
TheAdhesiveNogginFixingSystemCanbeusedtoprovideupto2hoursfireprotectiontoallsizesofstructuralsteelwork.
100mmwidenogginsofRocksilkFireTechDryFixNogginSlabfrictionfittedbetweentheflanges.
Attachflangepiecestowebpiecesusingpigtailscrewspositioned25mminfromeachendandat150mmcentres.
Attachflangepiecestowebpiecesusingpigtailscrewspositioned25mminfromeachendandat150mmcentres.
100mmwidenogginofRocksilkFireTechSlabgluedintoplaceusingsuitableadhesive
AttachtheRocksilkFireTechSlabwebpiecesbyimpalingovertheweldedpinsandsecuringinplacewith38mmspringsteelwashers.
Attachflangepiecestowebpiecesusingpigtailscrewsat150mmcentres.
Adhesiveshouldbeusedatthejointbetweensubsequentwebpieces.
AttachtheRocksilkFireTechSlabwebandflangepiecesbyimpalingoverthe3mmdiameterweldedmildsteelpinsandsecuringinplacewith38mmspringsteelwashers.
Adhesiveshouldbeusedatthejointbetweensubsequentwebpieces.
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Adhesive noggin fixing systemNogginsarecut100mmwidefrom20mmthickRocksilkFireTechSlab.Theyshouldbecuttoasuitablelengthrelativetothewebsizetogiveatightcompressionfit.
Nogginsaregluedtopandbottomusingatypicaladhesivethicknessof0.5mmandfrictionfittedbetweentheflangesat600mmcentres.
Thenogginsshouldbeinstalledinsuchawaythattheyareslightly'proud'oftheflange(byabout2mm)andsuchthattheycoincidewithjointsbetweentheboards.
Itispreferabletoleavethenogginsinpositionfor4hourstoallowtheadhesivetocure.However,wherethisisimpracticalRocksilkFireTechSlabcanstillbefittedbeforetheadhesivecuressincethenogginsareessentiallyfrictionfitted.
Forwebdepthsgreaterthan500mm,T-shapedorsolidnogginsshouldbeused,formedfromRocksilkFireTechSlab,andscrewedtogetherusingpigtailscrews.
Attachwebpiecestonogginsusingpigtailscrewsat100mmcentres
SolidnogginformedfromoneormorepiecesofRocksilkFireTechSlab
Greaterthan
500mmFull
depth
100mm
T-shapednogginformedfromtwopiecesofRocksilkFireTechSlabjoinedatrightanglesusingpigtailscrews
Insertnogginsasdescribedat600mmcentresandifpracticableleavefor4hoursforadhesivetocure.
CutRocksilkFireTechSlabtosizeasfollows:
Beams:flangepiecestodimensionX,webpiecestodimensionY+t(t=thicknessofboard)
Columns:flangepiecestodimensionX,webpiecestodimensionY+2t
100mm
Greaterthan
500mm
Y
X
Attachflangepiecestowebpiecesusingpigtailscrewspositioned25mminfromeachendat150mmcentres.
Note:Forflangesgreaterthan400mmuseweldedpinandspringsteelwasherstoprovideextraretentionoftheflangepieceofinsulation.Theweldedpinsshouldbelocatedalongthecentrelineoftheflangeat300mmcentres.
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Fire protectionApplication details for beams
Partitionabutmentusinganogginfixingsystem
Wallabutmentusinganogginfixingsystem
Pigtailscrewsatmaximum100mmcentres
Directedgefixingwithpigtailscrewsatmaximum150mmcentres
Attachflangepiecetowebpiecebyimpalingoverweldedpinsandsecuringtheboardtoboardjointwithpigtailscrewsat150mmcentres.Springsteelwashersareusedovertheweldedpinstoretaintheinsulation,anyexcesspinlengthbeingtrimmedoff
RocksilkFireTechSlab
C-StudpartitionwithstandardU-Channelheadtrack
Pigtailscrewsatmaximum100mmcentres
Attachflangepiecetowebpiecebyimpalingoverweldedpinsandsecuringtheboardtoboardjointwithpigtailscrewsat150mmcentres.Springsteelwashersareusedovertheweldedpinstoretaintheinsulation,anyexcesspinlengthbeingtrimmedoff
Directedgefixingwithpigtailscrewsatmaximum150mmcentres
RocksilkFireTechSlab
Masonrywall
RocksilkFireTechnoggin
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Columnwithwallliningabutment
Columnwithpartitionabutment
Adhesive detailTheadhesiveusedforgluingRocksilkFireTechSlabsshouldbeathixotropicpastetypebasedonsolublesolidsofsilicateandpotassiummixedwithclayorrefractorymineralfillertoanapproximateratioof70:30byweight.Steelworkshouldideallybedrybutthepresenceofcondensationwillmerelyprolongthecuretime,notweakenthebondstrength.
Sinceonlythetopandbottomsurfaceofeachnogginisgluedwithatypicaladhesivethicknessof0.5mm,excellentratesofusageareachievable.Note:Steelworkshouldbecleanandfreefromgreasepriortotheapplicationofadhesive.
*ForfurtherdetailscontactourTechnicalAdviceandSupportCentre.
RocksilkFireTechSlab
Masonrywall
KnaufWallboardnotfixedtothisC-Stud
Directedgefixingwithpigtailscrewsatmaximum150mmcentres
Directedgefixingwithpigtailscrewsatmaximum150mmcentres
RocksilkFireTechSlab
KnaufWallboardnotfixedtothisC-Stud
Pig tail screwsThespirallywoundorpigtailscrewsaremadefrom16gaugegalvanisedwireandareavailablefromstockists.AspecificationisavailableonrequestfromourTechnicalAdviceandSupportCentre.
Thescrewsshouldbeinstalledflushat150mmcentresonboardtoboardjointsand100mmcentresovernoggins,usingeitherpowerorhandtools.Thereisnoneedtocountersinkthescrewheads.
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Fire protectionMezzaninefloors
Rocksilk FireTech Slab
• Simple,cleanandquicktoinstall • Providesupto3hoursfireresistance• Systemcoverssectionfactorsupto 310Hp/A-(A/V)
Rocksilk FireTech Slab
• Non-combustiblewithaEuroclassA1 reaction to fire rating
• ZeroOzoneDepletionPotential(ODP)
• ZeroGlobalWarmingPotential(GWP)
PerformanceFire performanceRocksilkFireTechSlabisclassifiedasnon-combustibletoBS476:Part4:1970(1984).Class1SurfaceSpreadofFlametoBS476:Part7:1977,andClass‘O’totheBuildingRegulations.RocksilkFireTechSlabisdesignedtoprovideupto3hoursfireprotectiontothemezzaninefloorcolumnsupportsystem,therebysatisfyingthecurrentBuildingRegulationsandinsuranceindustryfireresistanceperformancestandards.
PerformanceRocksilkFireTechSlabisrotproof,doesnotsustainvermin,willnotencouragethegrowthoffungi,mouldorbacteriaandisodourlessandnon-hygroscopic.
ProductRocksilk FireTech Slab isadenserockmineralwoolslabspecificallydesignedforthefireprotectionofstructuralsteelwork.
Typical constructionTheexposedsurfaceofasteelsectionisfullyenclosedinRocksilkFireTechSlab,usingametalclip,snap-locksystem.
InstallationThecolumncaseispre-fabricatedtosuitthespecificbeamorcolumn.ItislinedwithRocksilkFiretechSlabwhichispre-bondedtothesteelskin.Notethatnoadhesiveisappliedtothejointsbetweenindividualslabs.ThecolumncaseismadeofgalvanizedorPVCcoatedsteelminimum0.7mmthick.Forcolumns,thecasingisnormallysuppliedintwopieceswiththeclosingfacefixedwithsnap-lockjoints.
Three-sidedencasementsaresecuredat300mmcentrestocontinuousgalvanizedsteelangles,ortheflangeofthesteelsection,ortothewallorfloorat500mmnominalcentres.Alternativelythecasingmaybesecuredusinganintegralliponthecasing.
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TechnicalspecificationRocksilkFireTechSlab….mmthick,tobeusedtoprovidefireprotectiontostructuralsteelworkinamezzaninefloorsystem.
Alternatively,consulttheNationalBuildingSpecifications,Standardversionclause/clauses…K11/885…………
KnaufInsulationspecificationclausescanbedownloadedfromknaufinsulation.co.uk/nbs
Table 1 - Mezzanine floors
Time-mins BoardThickness(mm) Hp/A
60 20 224
25 260
30 310
35 310
40 310
45 310
90 20 91
25 115
30 139
35 165
40 190
45 217
50 244
55 260
60 270
65 310
120 20 57
25 72
30 87
35 102
40 117
45 133
50 149
55 165
60 181
65 198
180 30 49
35 58
40 66
45 75
50 84
55 92
60 101
65 110
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Cavity barriersCavitybarrierdesign
DesignconsiderationsEverybuildingmustbedesignedandconstructedinsuchawaythatintheeventofanoutbreakoffirewithinthebuilding,theunseenspreadoffireandsmokewithinconcealedcavitiesinitsstructureandfabricisinhibited.TheBuildingRegulationsrequirecavitybarrierstosub-dividevoidsiftheyextendbeyondcertaindimensions.
Inadditioncavitybarriersarealsorequiredtobeplacedabovefireresistingpartitions.Bothglassandrockmineralwoolproductsareidealtoactascavitybarriersduetotheirinherentnon-combustibility.
Inthecaseoffirestoppingminorimperfectionsoffitbetweenconstructionelementsorcomponents,itisacceptabletosealsmallgapswithunfacedglassorrockmineralwoolproducts.However,forspecificperiodsoffireresistanceinsmallandlargevoids(asrequiredbytheBuildingRegulations)itisnecessarytousespecificproductsthathavebeentestedandassessedtooffertherequiredperformancewheninstalledinaspecificway,ifnecessary,usingspecificfixingcomponents.
ConcealedcavitiesFireandsmokespreadinconcealedspacesisparticularlyhazardousbecausefirecanspreadquicklythroughoutabuildingandremainundetectedbytheoccupantsofthebuilding.
Cavitybarriersareusedtosubdividecavitiesandsopreventsmokeandflamefromby-passingfire-resistingwallsandpartitions.Themaximumdistancebetweenbarriersmustbeappropriatetothelocationofeachcavity.Also,dueconsiderationmustbegiventotheclassofsurfaceexposedwithinthecavity.
Cavitybarriersshouldachieveatleast30minutesfireresistance,providingaminimumof30minutesintegrityand15minutesinsulation.
Detailedrequirementsarecomplex.ForfulldetailsaboutthepositionandspacingofcavityfirebarriersrefertotherelevantsectionsoftheappropriateBuildingRegulations.
SmallcavitybarriersSmallvoidsincludethecavitiesinexternalwallsandvoidsbeneathraisedaccessfloors.Largervoidsincludethespacesbetweensuspendedceilingsandsoffitsorroofs.
Incavitiesinexternalwallstheresilientpropertiesofglassmineralwoolmeanthatitcanbecompressionfitted,betweentheouterleafandtheinnerleaforframe.Thenon-combustiblenatureofglassmineralwoolallowsittoresisttheeffectsoffire,enablingittoremaininplaceduringthefireandeffectivelyblockthetransferoffirethroughthecavity.
LargecavitybarriersInEngland,WalesandNorthernIreland,allcavitybarriersshouldbeconstructedtoprovideatleast30minutesfireresistanceand15minutesinsulation.InScotlandlargecavitybarriers,whicharedefinedasbeinggreaterthan1mx1minsize,mustprovidethesame.
FixingsystemsAnyproductusedforfireprotectioncanonlybeconsideredtobeofferingaspecificperiodoffireprotectionwhenitisinstalledinthemannerspecifiedintheappropriatefiretestreport.Thisincludesthespecificationofallassociatedfixingsandsupportingframework.
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DefinitionsThefollowingdefinitionsaretakenfromApprovedDocumentB(Firesafety)-Volume2:Buildingsotherthandwellinghouses(2006)
CavitybarrierAconstruction,otherthansmokecurtain,providedtocloseaconcealedspaceagainstpenetrationofsmokeorflame,orprovidedtorestrictthemovementofsmokeorflamewithinsuchaspace.
Fire stopSealprovidedtocloseanimperfectionoffitordesigntolerancebetweenelementsorcomponents,torestrictthepassageoffireorsmoke.Anyunfacedglassorrockmineralproductcanbeusedasafirestop.
50mmRocksilkSmokeandFireBarrier 50mmRocksilk
SmokeandFireBarrier
50mmcavity
Suspendedceilingof12.5mmplasterboard
30minutesfireresistance 1hourfireresistance
Photograph courtesy of Henley Building Systems
Smallcavitybarriers-tobedeleted
Large cavity barriersProduct:RocksilkSmokeandFireBarrierSeepage:286
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Period of fire resistance (mins)
Knauf Insulation solution 0 mins 30 mins 60 mins 90 mins 120 mins 150 mins 180 mins 210 mins 240 mins
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• MeetsBuildingRegulation requirementsforfire,acousticsand party wall bypass applications
• Simple,cleanandquicktoinstall
• Colourcodedforeasyidentification
EarthwoolCavityBarrier
• Non-combustiblewithaEuroclassA1 reaction to fire rating
• A+GenericBREGreenGuiderating
• ZeroOzoneDepletionPotential(ODP)
• ZeroGlobalWarmingPotential(GWP)
Fire protectionSmallcavitybarriers
EarthwoolCavityBarrier
InstallationInverticalapplications,bothflangesoftheEarthwoolCavityBarriershouldbefixedtotheinnerleaf.
Inhorizontalapplications,thetopflangeofthepolythenesleeveshouldbefixedtotheinnerleaf.
AlljointsandintersectionsofEarthwoolCavityBarriersshouldbecloselybutted.
Typical constructionEarthwoolCavityBarriersareengineeredtopreventthespreadofsmokeandfirethroughwalls,floorsandcavitiesintimberframe,metalframeandmasonrybuildings.
Theyarealsosuitableforreducingflankingnoisetransmissionintheseconcealedcavities.
TheuseofthecorrectsizeofEarthwoolCavityBarrierisessential.EarthwoolCavityBarriersaredesignedtocompresstoatightfitincavitiesandintheeventoffirebreakingintothecavity,EarthwoolCavityBarriersdonotrelyonthepolytheneflangestoholdtheminplace,butontheircompressionbetweentheinnerandouterleaf.
Itis,therefore,essentialtospecifytheEarthwoolCavityBarrierbyreferencetotheactualconstructedcavitywidth.
ProductEarthwoolCavityBarrierismanufacturedfromacontinuouslengthofnon-combustibleglassmineralwoolwhichiscompressedwithinaresilientpolythenesleeveincorporatingtwoflangesdesignedforeaseoffixing.
Thepolythenesleeveiscolourcodedtosuitavarietyofcavitywidthsfrom50mmto100mmandeliminatestheneedforweatherprotectionduringinstallation.
Thebarriersare1200mmlongandcanbeusedinbothverticalandhorizontalapplications,andareavailableintwostandardwidths(100mmand300mm).100mmbarriersareusedfornormalfirestoppingandnoisereductionapplications.300mmbarriersareusedwherehigherperformancelevelsarespecifiedandatpartywall/externalwallcavityjunctions.
Fp04
EarthwoolCavityBarrierstapledthroughtopflangetosheathingtofullyfillthecavity
Brickouterleaf
NEW BUILD
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TechnicalspecificationTimber frame constructionEarthwoolCavityBarrier100mm*/300mm*wide,colouredyellow*/blue*/white*tobefrictionfittedinthepositionsshownonthedrawings.EarthwoolCavityBarriertofullyfillthedepthofthecavity.
Polytheneflangestobestapledtothetimber*/sheathingboard*toholdthecavitybarrierinplace.
AlljointsandintersectionsofEarthwoolCavityBarriersshouldbecloselybuttedtogether.
Alternatively,consulttheNationalBuildingSpecifications,Standardversionclause/clauses…P10/420……………
KnaufInsulationspecificationclausescanbedownloadedfromknaufinsulation.co.uk/nbs
Masonry constructionEarthwoolCavityBarrier100mm*/300mm*wide,colouredyellow*/blue*/white*tobefrictionfittedinthepositionsshownonthedrawings.
EarthwoolCavityBarriertofullyfillthedepthofthecavity.
AlljointsandintersectionsofEarthwoolCavityBarriersshouldbecloselybuttedtogether.
Alternatively,consulttheNationalBuildingSpecifications,Standardversionclause/clauses…P10/420……………
KnaufInsulationspecificationclausescanbedownloadedfromknaufinsulation.co.uk/nbs
PerformanceFire performanceEarthwoolCavityBarriersaremanufacturedfromglassmineralwoolwhichhasaEuroclassA1ratingwhenclassifiedinaccordancewithBSEN13501-1.EarthwoolCavityBarriershavebeentestedforfireresistanceinaccordancewithBS476:Part8:1972andwillprovide60minutesstability,integrityandinsulation.
Acoustic performance
BuildingRegulationsrequiretheuseofacavityclosertoreduceflankingnoisetransmissionalongpartywallcavitiesandexternalwallcavitiesinmasonryandtimberframeconstructions.
EarthwoolCavityBarriersmeetthegenericdescriptionforcavityclosersandwillthereforeensurecompliancewithPartEandRobustDetailsintimberframeandmasonrywallconstructions.
Table 2 - Colourcoding
Cavitywidth(mm) Colour
50-65 yellow
66-80 blue
81-100 white
Typicaljunctionwithpartywall
300mmwideEarthwoolCavityBarrier-stapledtosheathingboardeithersideofpartywall
EarthwoolTimberFramePartyWallSlab
EarthwoolFrameTherm
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Fire protectionLargecavitybarrier
RocksilkSmokeandFireBarrier
• Simple,cleanandquicktoinstall
• Providesbothfireandacoustic performance
• Versatile,flexibleandadaptable system
RocksilkSmokeandFireBarrier
• Non-combustiblewithaEuroclass A1 reaction to fire rating
• ZeroOzoneDepletionPotential(ODP)
• ZeroGlobalWarmingPotential(GWP)
For one hour fire resistanceTwolayersof50mmRocksilkSmokeandFireBarrier,separatedbya50mmairspace,appliedasahangingcurtainwithwiremeshtotheoutside,supportedcontinuouslyfromaboveandbothsides,usingthefixingslistedinTable3.Atthebaseitiseitherlappedfreelyontothebackofasuspendedceiling,orfixedtoapartitionhead.
UsefoilfacedRocksilkSmokeandFireBarrierwhentheceilingvoidisusedasanairplenum.
InstallationSeepage288-291forinstallationdetails.SeeTable3forspecificationoffixingsandsupportingmetalwork.
Typical constructionFor half an hour fire resistanceAsinglelayerof50mmRocksilkSmokeandFireBarrier,appliedasahangingcurtain,supportedcontinuouslyfromaboveandbothsides,usingthefixingslistedintheTable3.
AtthebaseRocksilkSmokeandFireBarrieriseitherlappedfreelyontothebackofasuspendedceilingorfixedtoapartitionhead.Suitablefordropsupto7metres.
ProductRocksilkSmokeandFireBarrierismadefromrockmineralwoolandformedintoaflexiblemattressfacedononesidewithgalvanisedwiremeshstitchedinposition.
RocksilkSmokeandFireBarrierisalsoavailablefoilfacedononeorbothsides.
RocksilkSmokeandFireBarriermustbeinstalledinaccordancewiththespecificationsdetailedbelowandonthefollowingpages.Ifthesespecificationsarenotstrictlyfollowedtheinstallationcannotbedeemedtoofferanyspecificperiodoffireprotection.
Fixingcomponents:Angle:Mildsteel-50mmx50mmx2mmor60mmx40mmx2mm
Strip:Mildsteel-40mmx2mm
SeeTable3forsuitablemethodoffixinganglesandstripstosubstrate.
Fp05
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Metalanglefixedtosoffit
RocksilkSmokeandFireBarrier
50mmairgap
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Metalanglesfixedtosoffit
RocksilkSmokeandFireBarrier
RocksilkSmokeandFireBarrierfixedtotimberspacer
TechnicalspecificationHalf hour cavity barrierAsinglelayerof50mmRocksilkSmokeandFireBarrier(*foilfaced)tobeinstalledinthepositionsmarkedonthedrawings,andfixedinaccordancewiththemanufacturer’srecommendations.Alljointseithertightlybutted,overlapped,orwithedgesreturned,andstitchedinacontinuousspiralloopwith1mmdiametergalvanisedlacingwire.(*deleteasappropriate)
OnehourcavitybarrierTwolayersof50mmRocksilkSmokeandFireBarrier(*foilfaced),separatedbya50mmairspacetobeinstalledinthepositionsmarkedonthedrawings,andfixedinaccordancewiththemanufacturer’srecommendations.Alljointseithertightlybutted,overlapped,orwithedgesreturned,andstitchedinacontinuousspiralloopwith1mmdiametergalvanisedlacingwire.(*deleteasappropriate)
Alternatively,consulttheNationalBuildingSpecifications,Standardversionclause/clauses…K10/545……………
KnaufInsulationspecificationclausescanbedownloadedfromknaufinsulation.co.uk/nbs
PerformanceFire performanceRocksilkSmokeandFireBarrierismadefromrockmineralwoolandisclassifiedasnon-combustibletoBS476:Part4:1970.RocksilkSmokeandFireBarrierhasaClass1SurfaceSpreadofFlametoBS476:Part7:1997andisClass‘0’totheBuildingRegulations.
WhensubjectedtofullscalefireresistanceteststoBS476:Part22:1987,asystemcomprisingonelayerof50mmRocksilkSmokeandFireBarrier,fixedbyusingthecomponentsandmethodsdetailedonthefollowingpagesachieved19minutesinsulation,andretaineditsintegrityfor35minutes,afterwhichtimethetestwasdiscontinued.50mmRocksilkSmokeandFireBarriertherebysatisfiesthecriterialaiddownintheBuildingRegulationsforcavitybarriers,byexceedingtheminimumrequirementof15minutesinsulationand30minutesintegrity.
WhensubjectedtofullscalefireresistanceteststoBS476:Part22:1987,asystemcomprisingadoublelayerof50mmRocksilkSmokeandFireBarrier,fixedbyusingthecomponentsandmethodsdetailedonthefollowingpages,achieved61minutesinsulation,andretaineditsintegrityfor66minutes,afterwhichtimethetestwasdiscontinued.
Adoublelayerof50mmRocksilkSmokeandFireBarriertherebysatisfiesthecriterialaiddownintheBuildingRegulationsforonehourcavitybarriers.
Thesetestsincorporatedverticalandhorizontaljointsbetweenbarriers.Fireresistanceiseffectivefromeithersideofthebarrier.Whentested,thewiresidewasexposedtothefurnaceasthisisthesidemostvulnerabletofire.
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Fire protectionInstallation of half hour cavity barrier
80mmminimum
1.Metalanglefixedtopurlin 2.Fixedtopurlin 3.Fixedtoribofcofferedslab
4.Fixedacrosscofferedceiling 5.Perimeterfixingwithsteelstrip 6.Junctionwithceiling
Attheceilingjunction,RocksilkSmokeandFireBarrieriscutanddrapedonandbetweenthejoists,andsecuredbyfixingtosteelangle,whichisitselffixedtothejoists(Figure6).Forsuspendedceilings,seeFigure11.
Atpartitionsorwallheads,ifasecurefixingisavailable,asatsoffits,RocksilkSmokeandFireBarriershouldbeclampedwithasteelstrip
Twolayersof50mmRocksilkSmokeandFireBarrierwitha50mmairspacebetweenthemareneededforonehourfireresistance.Ingeneraltwoseparatelayersshouldbeinstalledbacktoback,eachinamanneridenticaltothatshownforhalfhourfireresistance.ThejointsinthetwolayersshouldbestaggeredandRocksilkSmokeandFireBarrierreturnedoutwardatthetopandbottom.Thewirereinforcedsidesshouldbeplacedoutward,seeFigure7.
Concretedecks RocksilkSmokeandFireBarrierisclampedbetweenthedeckandsteelanglesecuredbyexpandingbolts.Ifthedeckiscoffereditshouldusuallybepossibletolocatethecavitybarrieralongoneoftheribs(Figure3).Iffittedacrossthecofferingitshouldbeclampedbysteelstrip,tothesteelanglewhichissecuredtotheribs.
Ifthedepthofcofferingislessthan100mm,RocksilkSmokeandFireBarriershouldbereturnedatthetopby300mm,toallowforcuttingattheribsandpushedsecurelyintothecoffering(Figure4).Ifthedepthofcofferingisgreaterthan100mm,RocksilkSmokeandFireBarriershouldbefixedaroundthecofferingusingsteelangle,asdescribedabove.Alternatively,proprietaryprofilefillersmaybeused.
Theperimeterofthebarriershouldbesecuredwithsteelstrip(Figure5).
InstallationThefollowinginformationandillustrationsoutlinetypicaldetailsfortheinstallationoflargecavitybarriers.Incaseofuncertainty,refertoKnaufInsulation.
Metal deck with overdeck insulation
IfRocksilkSmokeandFireBarrierrunswiththeslopeoftheroof,asupportingsteelangleshouldbefixedbetweenpurlinsandthesmokeandfirebarrierclampedtothiswithsteelstrip(Figure1).Theinsulationshouldproject80mmbeyondthestriptoensureagoodseal.
Iffittedacrossthesheetingprofile,RocksilkSmokeandFireBarriershouldbeboltedtothepurlins(Figure2).Itisreturnedatthetop,toalengthequivalentto3timestheprofiledepth,toallowforcuttingattroughsandpushingsecurelyintoprofiles.Alternatively,proprietaryprofilefillersmaybeused.
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7.Fixedtoconcreteslab 8.Fixingtowallhead
10.Fixingatperimeter9.Fixingtotimberspacer
Partitions and wall heads Ifpossible,RocksilkSmokeandFireBarriershouldbesecuredwithsteelstriptothepartitionorwallheadsoastomaintainthe50mmairspace(Figure8).Ifthisisnotpossible,itshouldbedrapedwithareturnofatleast150mm,orfixedtoatimberspacerwhichisfixedtothepartitionorwallhead(Figures6and9).
PerimeterfixingRocksilkSmokeandFireBarriershouldbesecuredwithsteelstriptothesidesoftheperimeterwall,soastomaintainthe50mmairspace(Figure10).
Fire protectionInstallation of one hour cavity barrier
Steelstripfixings: Tomasonryandconcrete BuildexTapcon4Hmasonryanchors Totimber BuildexHTrangeoffixings Tosteelangle Steelbolts
MinimumreturnofRocksilkSmokeandFireBarrier-Whenclampedtoflatsurface(verticalorhorizontal)80mm.Whenlooselaidoverhorizontalsurface-150mm.
Fixing system specifications
Table 3 - Specification of angles and stripsAngle:Mildsteel-50mmx50mmx2mmor60mmx40mmx2mmStrip:Mildsteel-40mmx2mm
Anglefixingstoconcretedecksandsteelsections:angles50x50x2mmFireresistance Maximumspacingoffixings(m)forthefollowingdropheights(m)period(mins) 3 3.5 4 4.5 5 5.5 6 6.5 730 2 2 2 2 2 2 2 2 260 2 2 1.75 1.5 1.5 1 1 0.75 0.75Key: M8
boltsM6bolts
Anglefixingstotimberbeamsandtrusses:angles50x50x2mmFireresistance Maximumspacingoffixings(m)forthefollowingdropheights(m)period(mins) 3 3.5 4 4.5 5 5.5 6 6.5 730 2 2 2 2 2 2 2 2 260 2 2 1.75 1.5 1.5 1 1 0.75 0.75Key: BuildexHTscrews,minimum25mmthreadpenetrationintotimber
BuildexHTscrews,minimum40mmthreadpenetrationintotimber
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Fire protectionJointing Rocksilk Smoke and Fire barrier
Suspended ceilingsWithsuspendedceilingswherepositivefixingtowallheadsorpartitionheadsisnotpossible,theweightofRocksilkSmokeandFireBarrierandthestiffnessofwirefacingaresuchthatitwillformaneffectivesealifitlapsthehorizontalsurfacebyaminimumof150mm.Lappedjointsareonlypermissiblewherethesuspendedceilinghasthesamefireresistanceasthecavitybarrier.RocksilkSmokeandFireBarriermustbeslitandfittedaroundanycrossingteestoeliminategapsandensurethatexcessiveloadsarenottransferredtotheceiling(Figure11).
JointingThissectiondescribestheapprovedmethodsforjoiningadjacentpiecesofRocksilkSmokeandFireBarrier.Themethodsareapplicabletobothhalfandonehourlargecavitybarriers.
12.Verticalbuttjoint 13.Verticalreturnedjoint 14.Verticallapjoint
500mmminimumoverlap
15.Perpendicularjoint 16.Horizontaljointatadrop
VerticalandhorizontaljointsThreemethodsofsecuringthejointsbetweenadjacentpiecesofRocksilkSmokeandFireBarrierareapproved.
Jointsaretightlybuttedtogetherandstitchedinacontinuousspiralloopwith1mmdiametergalvanisedlacingwire.Thestitchingshouldpassthroughthereinforcementmeshandthewooloneachsideofthebuttjointatcentresnotexceeding100mm(Figure12).
AlternativelytheRocksilkSmokeandFireBarrieredgesarereturnedatleast80mmandwiredtogether(Figure13),ortheymaybelappedatleast100mmandwiredtogether(Figure14).
PerpendicularjointsThejunctionbetweentwobarriersshouldbesecurelywiredtogether(Figure15)withareturnofatleast80mm.
DropsAllbarrierscanbeusedfordropheightsupto5mwithoutadditionalsupport.Fordropsbetween5mand7mitisnecessarytointroduceadditionalsupportingmembersinordertosupporttheweightofthefirebarriers(Figure16).
ServicesServiceswhicharepermittedbyBuildingRegulationstopenetratebarriers,shouldbeprovidedwithcollarsofRocksilkSmokeandFireBarrieratleast300mmlong,sewntothemainbarrierandthenstrappedorwiredsoastoavoidanypossibilityofgaps(Figure17).
Ahalfhourbarrierrequiresacollarononesideofthebarrier.Aonehourbarrierrequiresonecollaronbothsidesofthebarriersystem.
11.Junctionwithsuspendedceiling
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Penetrating steelwork ThisshouldbeprovidedwithacollarofRocksilkSmokeandFireBarrieratleast300mmlong(Figure18).Thecollarisfixedtotheconcreteormetaldeckbyclampingagainstthesesurfacesbehindsteelangle.ThevoidsinthesteelworkarefilledwithRocksilkSmokeandFireBarrier(figure18).Ahalfhourbarrierrequiresacollarononesideofthebarrier.Aonehourbarrierrequiresonecollaronbothofthelayersofthebarriersystem.
AccessWherepermanentaccessisneededthroughthebarrier,afiredoorandframe,ratedtotheappropriatefireresistance,mustbeused.RocksilkSmokeandFireBarriershouldbefixedsecurelytotheframe.
300mmminimum
17.Penetratingpipe
19.Temporaryframeworktoeasehandling
18.Penetratingsteelwork
HandlingDependingonthesizeofthebarrierandtheworkingspaceavailable,itissometimesdifficulttoholdthematerialinplacewhiletopfixingsarebeingsecured.Itwillbefoundhelpfultomakeatemporarypropfrom,e.g.slottedangle.ThismaycompriseacrosspieceoflengthappropriatetothewidthoftheRocksilkSmokeandFireBarrier,withstudsonthetopwhichwillhookintothewiremeshoftheRocksilkSmokeandFireBarrier.Thismaybeswivelledonthetopofahandle,andsecuredhorizontallyortotheangleoftheroofbyanadjustablebrace.ItisusedtoholdtheRocksilkSmokeandFireBarrierup,100mmorsobehindthefixinglocation,whilefixingisbeingcarriedout.Whenfixingtoaslopingdeck,thetopoftheRocksilkSmokeandFireBarriershouldbetrimmedtothecorrectangletoensurethatjointsaretrulyvertical(Figure19).
Following tradesTheintegrityofbarriersmustberestoredifdisturbedbyfollowingtrades,eitherduringthebuildingprocessoraftercompletion.Thisinstructionshouldbeincorporatedintothebuildinghandbook.
Fire protectionPenetrating pipes and ducts
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Internal floorRefurbishmentoftimberseparating/internalfloor
EarthwoolFlexibleSlab
Minimum18mmChipboardEarthwoolFlexibleSlab
Supportmeshstapledtojoists
Existingceiling
• Existingceilingcanbe retained,avoidingdisruption to rooms below
• Providesthermalandacoustic insulation as well as fire resistance
• Meetstherequirementsof Approved Document E for sound resistance of internal floors
EarthwoolFlexibleSlab
• Non-combustiblewithaEuroclassA1 reaction to fire rating
• A+GenericBREGreenGuiderating
• ZeroOzoneDepletionPotential(ODP)
• ZeroGlobalWarmingPotential(GWP)
InstallationAfterremovalofthefloordeck,linethevoidsinthefloorwith25mmwiremesh,toformasupporttrayfortheinsulation.Staplethewiremeshtothesidesofthejoists,atleast40mmupfromceilinglevel.
Cut100mmEarthwoolFlexibleSlabstosizeandlayontothewiremeshsupport,sothattherearenogapsbetweentheinsulationandthejoists.Buttjointtheinsulationslabssotherearenogapsbetweenthem.
Fixachipboardfloordeck,atleast18mmthick,overtheentirefloorarea.
Typical constructionTheuseofEarthwoolFlexibleSlabinasuspendedtimberfloorachievesonehourfireresistance,whilstallowingtheexistingceilingtoberetained.
Toachieveonehoursfireresistance:
•Thefloordeckshouldbeatleast18mmthicktonguedandgroovedchipboardortimberboarding
•Thejoistsmustbeatleast200mmdeepand37mmwide
•Thewiremeshshouldbestapledtothesidesofthejoistsatleast40mmabovetheceilinglevel
•Anyceilingcanbeused
ProductsEarthwoolFlexibleSlabisamulti-purposerockmineralwoolslabdesignedtobefrictionfittedinawiderangeofacoustic,thermalandfireresistantapplications.
IntroductionWheretheloftspaceofatwostoreyhouseisconvertedintohabitableaccommodation,thefloortothenewroomsmusthave30minutesfireresistanceoveranypartoftheescaperoutedirectlybelow.Thisisoftenthecasewhen,forexample,thefloorofthenewroomextendsoveralandinginthestairwayenclosurebelow.Thesolutiononthispageprovidestherequiredperiodoffireprotectionwithouthavingtoupgradetheexistingceiling.
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TypicalspecificationLay100mmEarthwoolFlexibleSlabon25mmchickenwiremesh,stapledtosidesofjoistsatleast40mmupfromceilinglevelandat600mmcentres.Thejoistsshouldbeatleast200x37mmandspacedatnotmorethan600mmcentres.Theflooringboardtobeatleast18mmthick.
Alternatively,consulttheNationalBuildingSpecifications,Standardversionclause/clauses…P10/250……………
KnaufInsulationspecificationclausescanbedownloadedfromknaufinsulation.co.uk/nbs
PerformanceFire performanceEarthwoolFlexibleSlabisclassifiedasEuroclassA1toBSEN13501-1andnon-combustibletoBS476:Part4:1970(1984),Class1SurfaceSpreadofFlametoBS476:Part7:1997andClass‘0’totheBuildingRegulations.
AcousticTheacousticperformanceofaninternalfloorcontaining100mmofEarthwoolFlexibleSlab(and12.50mmstandardplasterboardceiling)willbeatleast40dBandtherefore,meettherequirementsofApprovedDocumentEoftheBuildingRegulations.
Existingwall
Minimum18mmchipboard
EarthwoolFlexibleSlab
WiremeshstapledtojoiststoprovidesupportforEarthwoolFlexibleSlab
Existingceiling
EarthwoolFlexibleSlabcutandfrictionfittedbetweenlastjoistandwall
Typicalwallfloorjunction
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•Lightweight,mineralwoolhas approximatelyonehalftoonethirdof the weight of traditional silicate and vermiculite boards•Fastandsimplefixingsystemmakesthe slabsquickandeasytoinstall •Providesexcellentacousticandthermal performance insulation
Rocksilk Pyroduct Slab
•Non-combustiblewithaEuroclassA1 reaction to fire rating
•ZeroOzoneDepletionPotential(ODP)
•ZeroGlobalWarmingPotential(GWP)
ProductRocksilk PyroDuct Slabisa160kg/m3densityrockmineralwoolslab.TheslabsarefacedwithabrightClass‘O’reinforcedaluminiumfoil,makingitsuitableforapplicationsabovecleanrooms,withinairplenumsorforaestheticpurposes.
Typical constructionTheexposedsurfacesofsteelductworkarefullyenclosedinRocksilkPyroDuctSlabusingthefixingsystemshownonthefollowingpages.RocksilkPyroDuctSlabcanbeusedtoprovideupto2hoursfireprotectiontosteelductwork.
InstallationRocksilkPyroDuctSlabisappliedinasinglethickness,removingtheneedformultilayerapplications.Thisprovidesassuranceofauniformthicknessandthereforetheintegrityofthesystemandallowsforeasyverificationofcorrectinstallationonsite.
Individualslabsare1200mmlongand600mmwidemakingthemeasytocarryaroundsite.Theirlightweightnaturealsomakesthemeasytouse.Thefixingsystemofweldedpinsandsquareedgebuttjoints givesafastandsimplesystemwhichrequiresnospecialveecuts,drillingorsub-framesandalsomakestheslabsfastandeasytoinstall.
PerformanceFireRocksilkPyroDuctSlabisclassifiedasnon-combustibletoBS476:Part4:1970(1984),Class1surfacespreadofflametoBS476:Part7:1997andClass‘O’totheBuildingRegulations.
RocksilkPyroDuctSlabhasbeentestedinaccordancewithBS476:24:1987andcanprovideuptotwohoursfireresistanceforsteelductworkexposedtofireeitherinsideoroutsideoftheduct.
Moisture resistanceRocksilkPyroDuctSlabisnon-wickingwhentestedtoBS2972:1989:Section12.Whenexposedto90%relativehumidityand20ºC,RocksilkPyroDuctSlababsorbslessthan0.004%ofmoisture.
Fire protectionSteelDuctEncasement
Rocksilk Pyroduct Slab
NEW BUILD REFURB
Fp07 Blockworkcompartmentwall
RS33Slabaspacking
Steelanglerivettedat150mmcentres
RocksilkPyroductfixedtoduct
RocksilkPyroductgluedtowallandinsulation
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TypicalspecificationRocksilkPyroDuctSlab...........mmthicktobeusedtoprovideupto2hoursfireprotectiontosteelductworkasdetailedinthisschedule(specifiertostatewhichductsrequirefireprotection).
Itistobeinstalledusingthefixingsystemasdetailed,andatathicknesswithdueregardtotheductsize,orientationandperiodoffireprotectionrequired.
Table 4 - RequiredthicknessofRocksilkPyroDuctSlab
Thicknessofinsulation(mm)
Periodoffireresistance(hours)
Verticalducts Horizontalducts Kitchenextractducts
0.5 - - 45
1.0 45 45 90
2.0 90 90 -
Table 5 - Weightofslabs
Thickness(mm)
Weight(kg/m2)
45 7.20
90 14.40
WeightTable5showstheweightpersquaremetreofRocksilkPyroDuctSlab.
Fire protectionAnyverticalorhorizontal,rectangularorsquaresteelductworkassociatedwithventilationand/orairconditioningsystems,includingductedsupplyandextractsystems(whetherthroughductsorplenums),mechanicallyassistedsystemsandthoserelyingonnaturalconvectioncanbeprotectedwithRocksilkPyroDuctSlabstoprovidetherequireddegreeoffireprotection.
Achieving the required fire performanceTherequiredthicknessofRocksilkPyroDuctSlabdependsupontheorientationoftheductandtheperiodoffireresistancerequired.Table4displaysthethicknessesrequiredforverticalandhorizontalductsandalsoforkitchenextractductsforthecommonestperiodsoffireresistance.
Foilfacingomittedforclarity
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Fire protectionSteel Duct Encasement
Greaterthan1000mm
350mm
350mm
50mm
500mmmax
350mm 50mm
500mmmax
X
Y
Greaterthan1000mm
350mm
350mm
50mm
500mmmax
350mm 50mm
500mmmax
Greaterthan1000mm
350mm
350mm
50mm
500mmmax
350mm 50mm
500mmmax
X
Y
X
Y1.Weld3mmdiametersteelpinsat350mmlongitudinalcentres alongthecentrelineoftheverticalsidesoftheductwork.
2.Wherethedimensionoftheverticalsidesexceed1000mm, thesteelpinsshouldbeinrowsstarting50mminfromtheedge andspacedapartatamaximumof500mmcentres.
3.Weld3mmdiametersteelpinsat350mmlongitudinalcentres alongthehorizontalsurfacesoftheductworkinrowsstarting 50mminfromthelongitudinaledgeandspacedapartata maximumof500mmcentres.
4.CutRocksilkPyroDuctSlabtosizeasfollows: horizontalsurfacestodimensionX, verticalsurfacestodimensionY+2t, wheret=thicknessofinsulation.
5.Attachtheinsulationbyimpalingovertheweldedpinsand securingwith38mmspringsteelwashers.
6.Glueallboardtoboardjointsusingathixotropicsilicate basedadhesive.7.Trimoffpinlengthstoabout30mmexcessandbendthis excesstoformarightanglewiththeinsulation.8.Althoughnotessential,itisgoodpracticetooffsetthejoints foreachsurface.
6
7
8
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Fire protectionSteel Duct Encasement
Vertical ductsTheinstallationdetailonthepreviouspagesforhorizontalductsisalsorelevantforverticalductwork,thoughthehorizontalandverticalsurfacesreferredtoforhorizontalductworkwillbethelongestandshortestsurfacesrespectivelyinverticalductwork.
Ductwork passing through compartmentwalls or floorsInaccordancewithTheBuildingRegulations,whenductworkpassesthroughanyelementofconstructionwhichhasadesignatedperiodoffireresistance,theintegrityofthatcompartmentshouldbemaintained.Inthesesituations,theductworkintheimmediatevicinityofthepenetrationshouldbestiffenedasfollows:
–
a) When the flange is within 100mm of the penetration then a50 x 50 x 3mm steel angle should be rivetted to the top edgeof the duct using a single row of rivets with washers starting50mm from the edge and at 150mm centres.
Earthwool Building Slab RS33 should be used to pack any gapbetween the main insulation and the blockwork.
120 x 90mm sections of Rocksilk Pyroduct Slab is glued to the wall and main Pyroduct insulation.
b) When the flange is greater than 100mm from the penetration,two angles should be used, fixed as described in a) above, and45mm Rocksilk Pyroduct Slab installed perpendicular to the duct at the penetration.
Knauf Insulation Ltd Customer Service (Sales) Technical Advice and Support Centre LiteraturePO Box 10 Tel: 0844 800 0135 Tel: 01744 766 666 Tel: 08700 668 660Stafford Road Fax: 01744 612007 Fax: 01744 766 667 Fax: 0870 400 5797St Helens Email: [email protected] Email: [email protected] Email: [email protected] www.knaufinsulation.co.ukWA10 3NS