Section 6 · • Ease of cutting and fixing: Rock mineral wool ... light gauge steel angles. Knauf Insulation recommend the use of Knauf Drywall Screws, essential for fast construction,

Section 6

Fire Protection

April 2012

266

Fire Protection6.1

Technical Advice and Support Centre 01744 766666 www.knaufinsulation.co.uk

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

Fire protectionAnysteelsectionwhichisanelementofstructureandisdeemedbyanyofthefollowingregulationstorequirefireresistancecanbeprotectedwithafireprotectionsystemofdenserockmineralwoolslabsorfibrereinforcedgypsumbasedboards.

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.BuildingRegulationscoveringfiresafetyareconcernedwiththepreservationof life.

Withtheincreasinguseofstructuralsteelinconstruction,designersneedfireprotectionsolutionsthatprovideacombinationoffastinstallationandcost-effectivenesswhilstachievingthedesiredfinish.

WhatevertheapplicationKnaufInsulationhas arangeofboardproductsandsystemstocaterforanyproject.

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:Rockmineralwool slabsareeasytocutwitheitherasawora sharpknife,furthermoretherearefourfixing methods,allinvolvesquareedgebuttjoints betweentheboardswhichenablesafastand simplesystemtobeinstalledwithoutdelaying othertradesandactivities

Fibre reinforced gypsum•Smoothsurface–onlyrequiresdecorative finishesforcompletion

•Robustandimpactresistant–idealfor columnsandallexposedsurfaces

•Easytocuttosize–canbescoredand snappedtospeedupcuttingandreduce dustlevels

KnaufInsulationaremembersoftheAssociationforSpecialistFireProtection,andourfireprotectionproductsarelistedintheYellowBook,whichpresentseconomicalmethodsforthefireprotectionofstructuralsteelworktoprovidecompliancewithBuildingRegulations

267

Fire Protection 6.1


6.1

Fire protectionSolution optimiser and pathfinder

Fire protection

Period of fire resistance (mins)

Knauf Insulation solution

Mezzanine floorsProduct:RocksilkFireTechSlab

Seepage:280

0mins 30mins 60mins 90mins 120mins 150mins 180mins 210mins 240mins

Fp03

Key

Findonline.Visitknaufinsulation.co.ukandkeyinconstructioncodetofindthe

mostuptodateinformationonyourchosensolution.Pb01

Small cavity barriersProduct:EarthwoolCavityBarrier

Seepage:284

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

268

Fire Protection6.1


Fire protectionStructuralsteelwork

Knauf Fireboard

Typical constructionKnaufFireboardisusedinframelessencasements.Theproducthasbeenspeciallydevelopedtoacceptdirectedgefixings.CasingsconsistofKnaufFireboardscrewedorstapledtoitselfatabuttingcorners.

Forsteelworkencasedonallfoursides,KnaufFireboardisfixedateachcornerdirectlythroughthematerial,independentofthecolumnorbeam.Forpartialencasement,involvingwallorceilingabutments,KnaufFireboardisfixedtolightgaugesteelangles.

KnaufInsulationrecommendtheuseofKnaufDrywallScrews,essentialforfastconstruction,solidfixingandtightlyclosededgejoints.

ProductsKnauf Fireboardisagypsumbasedboardspeciallydevelopedforhighperformanceliningandencasement,providinguptotwohoursoffire protection.

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)

Edgefixtheboardsusing eitherKnaufDrywallScrewsatmaximum150mmcentresorproprietarystaplesat120mmcentres.

KnaufFireboard

KnaufDrywallScrewsatmaximum 100mmcentresintobackingstrips

Abutmentangles:lightgauge steelangleprovidessupportat soffitandwalljunctions.Fixedto adjoiningsoffitorsectionflange.

REFURBNEW BUILD

269

Fire Protection 6.1


6.1

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-combustible toBS476:Part4:1970(1984)andClass1surfacespreadofflametoBS476:Part7:1997.KnaufFireboardcomplieswiththeClass‘0’requirementsoftheBuildingRegulationswhentestedtoBS476:Part6:1989andPart7:1997andwiththelimitedcombustibilitydescribedintheBuildingRegulations.

Humidity Constanthumidityover95%orsubjectiontocontinuouswaterwillreducetheserviceabilityoftheboards.

OperatingtemperaturesContinuouslongtermexposuretotemperaturesover50ºCcaninduceachangeofstatewhichwouldreducethephysicalperformanceandserviceabilityoftheboards.

Health and safetyKnaufFireboardmustbeinstalledwithcare.Ensureadequateventilationduringinstallation,particularlywhencuttingboards.Avoidharshbodycontactwithsharpcutedgesofmetalcomponents.RefertoKnaufInsulationMaterialSafetyDataSheetsandtotheHealthandSafetyExecutivepublications.

ForHp/Atablespleasevisit knaufinsulation.co.uk

KnaufFireboardcasing

Staggerjointsby300mmminimum

Directedge-fixingwithKnaufDrywallScrewsat200mmcentresorproprietarystaplesat120mmcentres

270

Fire Protection6.1


1 2 Holdinplacethe first2boards

withclamps.3 Aftermeasuringthe

sizeoftheremaining2sides,cutanothertwotothedepthofthecolumnplustwicethethickness oftheboard.

4 Applytheremainingboards,adjusting thelengthofadjoiningboardstoensurethatboardjointsarestaggeredbyatleast300mm.

5 Edge-fixtheboards usingeitherself

drillingKnauf FireboardGripper Screwsat200mm centresorproprietary staplesat120mm centres.Knauf FireboardGripper Screwsshould penetrate into the casingbyatleast 30mm

Installationsequence

Fire protectionInstallation of column system

Partial column encasementAssumingatypicalthree-sidedencasementwhereoneofthecolumnflangesstraddlesawall,followthesameprocedureasoutlined forfour-sidedencasementwiththefollowingdifferences:

•Fix25x25mmlightgaugesteelangles, incontinuouslengths,toeithertheabuttingwallfaceortheinnerflangeofthecolumn.Useappropriateproprietaryfixingsat600mmcentres

Double layer applicationInstallthefirstlayerasdescribedforeitherfullorpartialencasement.Securethesecondlayertothefirstwithfixingsspacedasforthefirstlayerbutavoidcoincidentfixingpositions.

Itisgoodpracticethatboardjointsarestaggered–aswiththefirstlayer–betweenadjoiningboardsandalsobetweenthetwolayers.Inthecaseofstructuralsteelwork,doublelayerencasementwillobviatetheneedforjointbackingstrips.

InstallationSteelworkencasementsmustbeinstalledinfullaccordancewithKnaufInsulation’srecommendationsandincompliancewith BS8212:1995andBS8000:Part8:1994.Theinstallationproceduresoutlinedhererelatetonormalsinglelayerapplications.

Knauf Drywall ScrewsKnaufDrywallScrewsshouldpenetrateintothecasingbyatleast30mm.

Four-sidedcolumnencasement•Cuttwoboardstothewidthofthecolumn

flange.Cutanothertwotothedepthofthecolumnplustwicethethicknessoftheboard

•Adjustthelengthofadjoiningboardstoensurethatboardjointsarestaggeredbyatleast300mm

•Edge-fixtheboardsusingeitherKnaufDrywallScrewsat200mmcentresorproprietarystaplesat120mmcentres

Cuttwoboardsto thewidthofthe columnflange.

271

Fire Protection 6.1


6.1

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-fixthesetotheangles at150mmcentreswith

35mmKnaufDrywall Screws.

3 Cutasoffitboardtothe widthofthesteelflange.

Thelengthofthisboardmust differfromthesideboardsto ensureadjacentboardjoints arestaggeredbyatleast 300mm.

Edge-fixhorizontalboardto thetwoverticalboardsusing

eitherKnaufFireboard GripperScrewsat150mm centresorproprietarystaples at120mmcentres.

4 Cutboardoff-cuts100mm wideasjointbackingstrips.

Fitthese,halflapped,behind allbuttjointsatthesides andsoffitofthebeam.

FixwithKnaufFireboard GripperScrewsatmaximum

100mmcentres.

6.1

nominal150mmcentres,screwlengthsshouldbeequaltothethicknessofthesecondlayer,plus30mm.WheretwodifferentthicknessesofFireboardareapplied,thethickerlayerisinstalledfirst.

272

Fire Protection6.1


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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Fire Protection 6.1


6.1

Columnwithpartitionabutment

KnaufC-Studtoggle-fixedtoKnaufFireboardcasing

KnaufWallboardnotfixedtothisC-Stud


Continuous25x25mmKnaufFireboardangleateachcorner



Columnwithwallliningabutment

274

Fire Protection6.1


Fire protectionStructuralsteelwork

Rocksilk FireTech Slab

NogginofRocksilkFireTechSlab orRocksilkFireTechDryFixNogginSlab

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


• Non-combustiblewithaEuroclassA1 reaction to fire rating



Pigtailscrews

REFURB

275

Fire Protection 6.1


6.1

TechnicalspecificationRocksilkFireTechSlab,...…mmthick,tobeusedtoprovidefireprotectiontostructuralsteelwork.

Itistobeinstalledusingthedryfixnogginsystem*/adhesivenogginfixingsystem*/combinationfixingsystem*/weldedpinfixingsystem*(*specifier’schoice)asdetailedintheInstallationsection.



PerformanceFire performanceRocksilkFireTechSlabisclassifiedasnon-combustibletoBS476:Part4:1970(1984),Class1surfacespreadofflametoBS476:Part7:1997,andClass‘0’totheBuildingRegulations.RocksilkFireTechSlabisdesignedtoprovideupto4hoursfireprotectiontostructuralsteelwork,therebysatisfyingtheBuildingRegulationsandinsurancedemandsforperiodsoffireresistance.

DurabilityRocksilkFireTechSlabisrotproof,doesnotsustainverminandwillnotencouragethegrowthoffungi,mouldorbacteria.

RocksilkFireTechSlabisodourlessand non-hygroscopic.

RocksilkFireTechSlabisnon-wickingwhentestedtoBS2972:1989:Section12.

Whenexposedto90%relativehumidityand20ºC,RocksilkFireTechSlababsorbslessthan0.004%ofmoisture.

ForHp/Atablespleasevisit knaufinsulation.co.uk

NogginofRocksilkFireTechSlabor RocksilkFireTechDryFixNogginSlab

PigTailScrews


276

Fire Protection6.1


Fire protectionInstallation of Rocksilk FireTech Slab

AdhesiveNogginFixingSystemUpto2hoursfireprotection

Attachwebpiecestonogginswithpigtailscrewsat100mmcentres.

DryFixNogginSystemUpto2hoursfireprotection

WeldedPinFixingSystemUp to 4 hours fire protection

CombinationFixingSystemUp to 3 hours fire protection

Attachwebpiecestonogginswithpigtailscrewsat100mmcentres.

Theuseofadenserockmineralwoolslab requiresnospecialveecuts,drillingor sub-frames,makingitfastandeasytoinstall.Rockmineralwoolslabscanbeeasilycutusinghandorpowertools.

Note:RocksilkFireTechDryFixNogginSlabhasadensityof200kg/m3.

TheCombinationFixingSystemCanbeusedtoprovideupto2hoursfireprotectiontoallsizesofstructuralsteelwork,andupto3hoursfireprotectiontosteelworkwithsectionfactors(Hp/A)ofupto133m-1 for columnsand143m-1forbeams.

TheWeldedPinFixingSystem Canbeusedtoprovideupto3hoursfireprotectiontoallsizesofstructuralsteelwork,andupto4hoursfireprotectiontosteelworkwithsectionfactors(Hp/A)ofupto172m-1 for columnsand184m-1forbeams.

Ifsectionfactorsareabove260m-1 contact our Technical Advice and Support Centre.

Alternative installation methodsTheDryFixNogginSystem Isafastandefficientfrictionfitnogginsystemthatdoesnotrequireadhesive.Itcangiveupto2hoursfireprotectiontoBS476:Part21.Wheninstalling20,25and30mmRocksilkFireTechSlab,nogginsshouldbecutfroma30mmRocksilkFireTechDryFixNogginSlab.WhengreaterthicknessesofRocksilkFireTechSlabareused,thenogginsarecutfromacorrespondingthicknessofRocksilkFireTechDryFixNogginSlab.

TheAdhesiveNogginFixingSystem Canbeusedtoprovideupto2hoursfireprotectiontoallsizesofstructuralsteelwork.

100mmwidenogginsofRocksilkFireTechDryFixNogginSlabfrictionfittedbetweentheflanges.

Attachflangepiecestowebpiecesusingpigtailscrewspositioned25mminfromeachendandat150mmcentres.

Attachflangepiecestowebpiecesusingpigtailscrewspositioned25mminfromeachendandat150mmcentres.

100mmwidenogginofRocksilkFireTechSlabgluedintoplaceusingsuitableadhesive

AttachtheRocksilkFireTechSlabwebpiecesbyimpalingovertheweldedpinsandsecuringinplacewith38mmspringsteelwashers.

Attachflangepiecestowebpiecesusingpigtailscrewsat150mmcentres.

Adhesiveshouldbeusedatthejointbetweensubsequentwebpieces.

AttachtheRocksilkFireTechSlabwebandflangepiecesbyimpalingoverthe3mmdiameterweldedmildsteelpinsandsecuringinplacewith38mmspringsteelwashers.

Adhesiveshouldbeusedatthejointbetweensubsequentwebpieces.

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Fire Protection 6.1


6.1

Adhesive noggin fixing systemNogginsarecut100mmwidefrom20mmthickRocksilkFireTechSlab.Theyshouldbecuttoasuitablelengthrelativetothewebsizetogive atightcompressionfit.

Nogginsaregluedtopandbottomusingatypicaladhesivethicknessof0.5mmandfrictionfittedbetweentheflangesat600mmcentres.

Thenogginsshouldbeinstalledinsuchawaythattheyareslightly'proud'oftheflange(byabout2mm)andsuchthattheycoincidewithjointsbetweentheboards.

Itispreferabletoleavethenogginsinpositionfor4hourstoallowtheadhesivetocure.However,wherethisisimpracticalRocksilkFireTechSlabcanstillbefittedbeforetheadhesivecuressincethenogginsareessentiallyfriction fitted.

Forwebdepthsgreaterthan500mm,T-shapedorsolidnogginsshouldbeused,formedfromRocksilkFireTechSlab,andscrewedtogetherusingpigtailscrews.

Attachwebpiecestonogginsusingpigtailscrewsat100mmcentres

Solidnogginformedfromoneormorepieces ofRocksilkFireTechSlab

Greaterthan

500mmFull

depth

100mm

T-shapednogginformedfromtwopiecesofRocksilkFireTechSlabjoinedatrightanglesusingpigtailscrews

Insertnogginsasdescribedat600mm centresandifpracticableleavefor4hours foradhesivetocure.

CutRocksilkFireTechSlabtosizeasfollows:

Beams:flangepiecestodimensionX,webpiecestodimensionY+t(t=thicknessofboard)

Columns:flangepiecestodimensionX, webpiecestodimensionY+2t

100mm

Greaterthan

500mm

Y

X

Attachflangepiecestowebpiecesusingpigtailscrewspositioned25mminfromeach endat150mmcentres.

Note:Forflangesgreaterthan400mmuseweldedpin andspringsteelwasherstoprovideextraretentionof theflangepieceofinsulation.Theweldedpinsshould belocatedalongthecentrelineoftheflangeat300mmcentres.

278

Fire Protection6.1


Fire protectionApplication details for beams

Partitionabutmentusinganogginfixingsystem

Wallabutmentusinganogginfixingsystem

Pigtailscrewsatmaximum100mmcentres

Directedgefixingwithpigtailscrewsatmaximum150mmcentres

Attachflangepiecetowebpiecebyimpalingoverweldedpinsandsecuringtheboardtoboardjointwithpigtailscrewsat150mmcentres.Springsteelwashersareusedovertheweldedpinstoretaintheinsulation,anyexcesspinlengthbeingtrimmedoff


C-StudpartitionwithstandardU-Channelheadtrack

Pigtailscrewsatmaximum100mmcentres

Attachflangepiecetowebpiecebyimpalingoverweldedpinsandsecuringtheboardtoboardjointwithpigtailscrewsat150mmcentres.Springsteelwashersareusedovertheweldedpinstoretaintheinsulation,anyexcesspinlengthbeingtrimmedoff

Directedgefixingwithpigtailscrewsatmaximum150mmcentres


Masonrywall

RocksilkFireTechnoggin

279

Fire Protection 6.1


6.1

Columnwithwallliningabutment

Columnwithpartitionabutment

Adhesive detailTheadhesiveusedforgluingRocksilkFireTechSlabsshouldbeathixotropicpastetypebasedonsolublesolidsofsilicateandpotassiummixedwithclayorrefractorymineralfillertoanapproximateratioof70:30byweight.Steelworkshouldideallybedrybutthepresenceofcondensationwillmerelyprolongthecuretime,notweakenthebondstrength.

Sinceonlythetopandbottomsurfaceofeachnogginisgluedwithatypicaladhesivethicknessof0.5mm,excellentratesofusageareachievable.Note:Steelworkshouldbecleanandfreefromgreasepriortotheapplicationofadhesive.

*ForfurtherdetailscontactourTechnicalAdviceandSupport Centre.


Masonrywall


Directedgefixingwithpigtailscrewsat maximum150mmcentres

Directedgefixingwithpigtailscrewsat maximum150mmcentres



Pig tail screwsThespirallywoundorpigtailscrewsare madefrom16gaugegalvanisedwireand areavailablefromstockists.Aspecification isavailableonrequestfromourTechnicalAdvice and Support Centre.

Thescrewsshouldbeinstalledflushat150mmcentresonboardtoboardjointsand100mmcentresovernoggins,usingeitherpowerorhandtools.Thereisnoneedtocountersinkthescrewheads.

280

Fire Protection6.1


Fire protectionMezzaninefloors


• Simple,cleanandquicktoinstall • Providesupto3hoursfireresistance• Systemcoverssectionfactorsupto 310Hp/A-(A/V)





PerformanceFire performanceRocksilkFireTechSlabisclassifiedas non-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.

Fp03


REFURB

281

Fire Protection 6.1


6.1

TechnicalspecificationRocksilkFireTechSlab….mmthick,tobe usedtoprovidefireprotectiontostructuralsteelworkinamezzaninefloorsystem.

Alternatively,consulttheNationalBuildingSpecifications,Standardversionclause/clauses…K11/885…………


Table1-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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Fire Protection6.1


Cavity barriersCavitybarrierdesign

DesignconsiderationsEverybuildingmustbedesignedandconstructedinsuchawaythatintheeventofanoutbreakoffirewithinthebuilding,theunseenspreadoffireandsmokewithinconcealedcavitiesinitsstructureandfabricisinhibited.TheBuildingRegulationsrequirecavitybarrierstosub-dividevoidsiftheyextendbeyondcertaindimensions.

Inadditioncavitybarriersarealsorequiredtobeplacedabovefireresistingpartitions.Bothglassandrockmineralwoolproductsareidealtoactascavitybarriersduetotheirinherentnon-combustibility.

Inthecaseoffirestoppingminorimperfectionsoffitbetweenconstructionelementsorcomponents,itisacceptabletosealsmallgapswithunfacedglassorrockmineralwoolproducts.However,forspecificperiodsoffireresistanceinsmallandlargevoids(asrequiredbytheBuildingRegulations)itisnecessarytousespecificproductsthathavebeentestedandassessedtooffertherequiredperformancewheninstalledinaspecificway,ifnecessary,usingspecificfixingcomponents.

ConcealedcavitiesFireandsmokespreadinconcealedspacesisparticularlyhazardousbecausefirecanspreadquicklythroughoutabuildingandremainundetectedbytheoccupantsofthebuilding.

Cavitybarriersareusedtosubdivide cavitiesandsopreventsmokeandflamefromby-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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Fire Protection 6.1


6.1

DefinitionsThefollowingdefinitionsaretakenfromApprovedDocumentB(Firesafety)-Volume2:Buildingsotherthandwellinghouses(2006)

CavitybarrierAconstruction,otherthansmokecurtain,providedtocloseaconcealedspaceagainstpenetrationofsmokeorflame,orprovidedtorestrictthemovementofsmokeorflamewithinsuchaspace.

Fire stopSealprovidedtocloseanimperfectionof fitordesigntolerancebetweenelementsorcomponents,torestrictthepassageoffire orsmoke.Anyunfacedglassorrockmineralproductcanbeusedasafirestop.

50mmRocksilkSmokeandFireBarrier 50mmRocksilk

Smokeand Fire Barrier

50mmcavity

Suspendedceiling of12.5mmplasterboard

30minutesfireresistance 1hourfireresistance

Photograph courtesy of Henley Building Systems

Small cavity barriersProduct:EarthwoolCavityBarrier

Seepage:284

Large cavity barriersProduct:RocksilkSmokeandFireBarrier Seepage:286

Fp04

Fp05

Period of fire resistance (mins)

Knauf Insulation solution 0mins 30mins 60mins 90mins 120mins 150mins 180mins 210mins 240mins

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Fire Protection6.1


• MeetsBuildingRegulation requirementsforfire,acousticsand party wall bypass applications

• Simple,cleanandquicktoinstall

• Colourcodedforeasyidentification

EarthwoolCavityBarrier


• A+GenericBREGreenGuiderating



Fire protectionSmallcavitybarriers

EarthwoolCavityBarrier

InstallationInverticalapplications,bothflangesoftheEarthwoolCavityBarriershouldbefixedtotheinner leaf.

Inhorizontalapplications,thetopflangeof thepolythenesleeveshouldbefixedtothe inner leaf.

AlljointsandintersectionsofEarthwoolCavityBarriersshouldbecloselybutted.

Typical constructionEarthwoolCavityBarriersareengineeredtopreventthespreadofsmokeandfirethroughwalls,floorsandcavitiesintimberframe,metalframeandmasonrybuildings.

Theyarealsosuitableforreducingflankingnoisetransmissionintheseconcealedcavities.

TheuseofthecorrectsizeofEarthwoolCavityBarrierisessential.EarthwoolCavityBarriersaredesignedtocompresstoatightfitincavitiesandintheeventoffirebreakingintothecavity,EarthwoolCavityBarriersdonotrelyonthepolytheneflangestoholdtheminplace,butontheircompressionbetweentheinnerandouter leaf.

Itis,therefore,essentialtospecifytheEarthwoolCavityBarrierbyreferencetotheactualconstructedcavitywidth.

ProductEarthwoolCavityBarrierismanufacturedfromacontinuouslengthofnon-combustibleglassmineralwoolwhichiscompressedwithinaresilientpolythenesleeveincorporatingtwoflangesdesignedforeaseoffixing.

Thepolythenesleeveiscolourcodedtosuitavarietyofcavitywidthsfrom50mmto100mmandeliminatestheneedforweatherprotectionduringinstallation.

Thebarriersare1200mmlongandcanbeusedinbothverticalandhorizontalapplications,andareavailableintwostandardwidths(100mmand300mm).100mmbarriersareusedfornormalfirestoppingandnoisereductionapplications.300mmbarriersareusedwherehigherperformancelevelsarespecifiedandatpartywall/externalwallcavityjunctions.

Fp04

EarthwoolCavityBarrierstapledthroughtopflangetosheathingtofullyfillthecavity

Brickouterleaf

NEW BUILD

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Fire Protection 6.1


6.1

TechnicalspecificationTimber frame constructionEarthwoolCavityBarrier100mm*/300mm*wide,colouredyellow*/blue*/white*tobefrictionfittedinthepositionsshownonthedrawings.EarthwoolCavityBarriertofullyfillthedepthofthecavity.

Polytheneflangestobestapledtothetimber*/sheathingboard*toholdthecavitybarrierinplace.

AlljointsandintersectionsofEarthwoolCavityBarriersshouldbecloselybuttedtogether.

Alternatively,consulttheNationalBuildingSpecifications,Standardversionclause/clauses…P10/420……………


Masonry constructionEarthwoolCavityBarrier100mm*/300mm*wide,colouredyellow*/blue*/white*tobefrictionfittedinthepositionsshownon thedrawings.

EarthwoolCavityBarriertofullyfillthedepth ofthecavity.

AlljointsandintersectionsofEarthwoolCavityBarriersshouldbecloselybuttedtogether.



PerformanceFire performanceEarthwoolCavityBarriersaremanufacturedfromglassmineralwoolwhichhasaEuroclassA1ratingwhenclassifiedinaccordancewithBSEN13501-1. EarthwoolCavityBarriershavebeentestedforfireresistanceinaccordancewithBS476:Part8:1972andwillprovide60minutesstability,integrityandinsulation.

Acoustic performance

BuildingRegulationsrequiretheuseofacavityclosertoreduceflankingnoisetransmissionalongpartywallcavitiesandexternalwallcavitiesinmasonryandtimberframeconstructions.

EarthwoolCavityBarriersmeetthegenericdescriptionforcavityclosersandwillthereforeensurecompliancewithPartEandRobustDetailsintimberframeandmasonrywallconstructions.

Table2-Colourcoding

Cavitywidth(mm) Colour

50-65 yellow

66-80 blue

81-100 white

Typicaljunctionwithpartywall

300mmwideEarthwoolCavityBarrier-stapledtosheathingboardeithersideofpartywall

EarthwoolTimberFramePartyWallSlab

EarthwoolFrameTherm

286

Fire Protection6.1


Fire protectionLargecavitybarrier

RocksilkSmokeandFireBarrier

• Simple,cleanandquicktoinstall

• Providesbothfireandacoustic performance

• Versatile,flexibleandadaptable system


• Non-combustiblewithaEuroclass A1 reaction to fire rating



For one hour fire resistanceTwolayersof50mmRocksilkSmokeandFireBarrier,separatedbya50mmairspace,appliedasahangingcurtainwithwiremesh totheoutside,supportedcontinuouslyfrom aboveandbothsides,usingthefixingslistedin Table3.Atthebaseitiseitherlappedfreelyontothebackofasuspendedceiling,orfixedtoapartition head.

UsefoilfacedRocksilkSmokeandFireBarrierwhentheceilingvoidisusedasanairplenum.

InstallationSeepage288-291forinstallationdetails. SeeTable3forspecificationoffixingsandsupportingmetalwork.

Typical constructionFor half an hour fire resistanceAsinglelayerof50mmRocksilkSmokeandFireBarrier,appliedasahangingcurtain,supportedcontinuouslyfromaboveandbothsides,usingthefixingslistedintheTable3.

AtthebaseRocksilkSmokeandFireBarrieriseitherlappedfreelyontothebackofasuspendedceilingorfixedtoapartitionhead.Suitablefordropsupto7metres.

Product RocksilkSmokeandFireBarrierismadefromrockmineralwoolandformedintoaflexiblemattressfacedononesidewithgalvanised wiremeshstitchedinposition.

RocksilkSmokeandFireBarrierisalsoavailablefoilfacedononeorbothsides.

RocksilkSmokeandFireBarriermustbeinstalledinaccordancewiththespecificationsdetailedbelowandonthefollowingpages.Ifthesespecificationsarenotstrictlyfollowedtheinstallationcannotbedeemedtoofferanyspecificperiodoffireprotection.

Fixingcomponents:Angle:Mildsteel-50mmx50mmx2mmor60mmx40mmx2mm

Strip:Mildsteel-40mmx2mm

SeeTable3forsuitablemethodoffixinganglesandstripstosubstrate.

Fp05

RocksilkSmokeand FireBarrierfixedto50mm timberspacer

Metalanglefixedtosoffit


50mmairgap

REFURB

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Fire Protection 6.1


6.1

Metalanglesfixedtosoffit

RocksilkSmokeand Fire Barrier

RocksilkSmokeandFireBarrierfixedtotimberspacer

TechnicalspecificationHalf hour cavity barrierAsinglelayerof50mmRocksilkSmokeandFireBarrier(*foilfaced)tobeinstalledinthepositionsmarkedonthedrawings,andfixedinaccordancewiththemanufacturer’srecommendations.Alljointseithertightlybutted,overlapped,orwithedgesreturned,andstitchedinacontinuousspiralloopwith1mmdiametergalvanisedlacingwire. (*deleteasappropriate)

OnehourcavitybarrierTwolayersof50mmRocksilkSmokeand FireBarrier(*foilfaced),separatedbya50mmairspacetobeinstalledinthepositionsmarkedonthedrawings,and fixedinaccordancewiththemanufacturer’srecommendations.Alljointseithertightlybutted,overlapped,orwithedgesreturned,andstitchedinacontinuousspiralloopwith1mmdiametergalvanisedlacingwire.(*deleteasappropriate)



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.

288

Fire Protection6.1


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.

289

Fire Protection 6.1


6.1

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

Table3-Specification of angles and stripsAngle:Mildsteel-50mmx50mmx2mmor60mmx40mmx2mm Strip: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

290

Fire Protection6.1


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

VerticalandhorizontaljointsThreemethodsofsecuringthejointsbetweenadjacentpiecesofRocksilkSmokeandFireBarrier are approved.

Jointsaretightlybuttedtogetherandstitchedinacontinuousspiralloopwith1mmdiametergalvanisedlacingwire.Thestitchingshouldpassthroughthereinforcementmeshandthewooloneachsideofthebuttjointatcentresnotexceeding100mm(Figure12).

AlternativelytheRocksilkSmokeandFireBarrieredgesarereturnedatleast80mmandwiredtogether(Figure13),ortheymaybelappedatleast100mmandwiredtogether(Figure14).

PerpendicularjointsThejunctionbetweentwobarriersshouldbesecurelywiredtogether(Figure15)withareturnofatleast80mm.

DropsAllbarrierscanbeusedfordropheightsupto5mwithoutadditionalsupport.Fordropsbetween5mand7mitisnecessarytointroduceadditionalsupportingmembersinordertosupporttheweightofthefirebarriers(Figure16).

ServicesServiceswhicharepermittedbyBuildingRegulationstopenetratebarriers,should beprovidedwithcollarsofRocksilkSmokeandFireBarrieratleast300mmlong,sewntothemainbarrierandthenstrappedorwiredsoastoavoidanypossibilityofgaps(Figure17).

Ahalfhourbarrierrequiresacollaron onesideofthebarrier.Aonehourbarrierrequiresonecollaronbothsidesofthebarriersystem.

11.Junctionwithsuspendedceiling

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Fire Protection 6.1


6.1

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

292

Fire Protection6.1


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



• A+GenericBREGreenGuiderating



InstallationAfterremovalofthefloordeck,linethevoidsinthefloorwith25mmwiremesh,toformasupporttrayfortheinsulation.Staplethewiremeshtothesidesofthejoists,atleast40mmupfromceilinglevel.

Cut100mmEarthwoolFlexibleSlabstosizeandlayontothewiremeshsupport,sothattherearenogapsbetweentheinsulationandthejoists.Buttjointtheinsulationslabssotherearenogapsbetweenthem.

Fixachipboardfloordeck,atleast18mmthick,over the entire floor area.

Typical constructionTheuseofEarthwoolFlexibleSlabinasuspendedtimberfloorachievesonehourfireresistance,whilstallowingtheexistingceilingtoberetained.

Toachieveonehoursfireresistance:

•Thefloordeckshouldbeatleast18mmthicktonguedandgroovedchipboardortimberboarding

•Thejoistsmustbeatleast200mmdeepand37mmwide

•Thewiremeshshouldbestapledtothesidesofthejoistsatleast40mmabovetheceilinglevel

•Anyceilingcanbeused

ProductsEarthwoolFlexibleSlabisamulti-purposerockmineralwoolslabdesignedtobefrictionfittedinawiderangeofacoustic,thermalandfireresistantapplications.

IntroductionWheretheloftspaceofatwostoreyhouseisconvertedintohabitableaccommodation,thefloortothenewroomsmusthave30minutesfireresistanceoveranypartoftheescaperoutedirectlybelow.Thisisoftenthecasewhen,forexample,thefloorofthenewroomextendsoveralandinginthestairwayenclosurebelow.Thesolutiononthispageprovidestherequiredperiodoffireprotectionwithouthavingtoupgradetheexistingceiling.

Fp06REFURB

293

Fire Protection 6.1


6.1

TypicalspecificationLay100mmEarthwoolFlexibleSlabon25mmchickenwiremesh,stapledtosidesofjoistsatleast40mmupfromceilinglevelandat600mmcentres.Thejoistsshouldbeatleast200x37mmandspacedatnotmorethan600mmcentres.Theflooringboardtobeatleast18mmthick.



PerformanceFire performanceEarthwoolFlexibleSlabisclassifiedasEuroclassA1toBSENISO13501-1andnon-combustibletoBS476:Part4:1970(1984),class1SurfaceSpreadofFlametoBS476:Part7:1997andClass‘0’totheBuildingRegulations.

AcousticTheacousticperformanceofaninternalfloorcontaining100mmofEarthwoolFlexibleSlab(and12.50mmstandardplasterboardceiling)willbeatleast40dBandtherefore,meettherequirementsofApprovedDocumentEoftheBuildingRegulations.

Existingwall

Minimum18mmchipboard


WiremeshstapledtojoiststoprovidesupportforEarthwoolFlexibleSlab

Existingceiling

EarthwoolFlexibleSlabcutandfrictionfittedbetweenlastjoistandwall

Typicalwallfloorjunction

294

Fire Protection6.1


•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.

RocksilkPyroDuctSlabhasbeentestedinaccordancewithBS476:24:1987andcanprovideuptotwohoursfireresistanceforsteelductworkexposedtofireeitherinsideoroutsideof the duct.

Thermal RocksilkPyroDuctSlabhasathermalconductivityof0.035W/mK.

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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Fire Protection 6.1


6.1

TypicalspecificationRocksilkPyroDuctSlab...........mmthicktobeusedtoprovideupto2hoursfireprotectiontosteelductworkasdetailedinthisschedule(specifiertostatewhichductsrequirefireprotection).

Itistobeinstalledusingthefixingsystemasdetailed,andatathicknesswithdueregardtotheductsize,orientationandperiodoffireprotectionrequired.

Table4-RequiredthicknessofRocksilkPyroDuctSlab

Thicknessofinsulation(mm)

Periodoffire resistance(hours)

Verticalducts Horizontalducts Kitchenextractducts

0.5 - - 45

1.0 45 45 90

2.0 90 90 -

Table5-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 Protection6.1


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

297

Fire Protection 6.1


6.1

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.

Rocksilk Universal 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.

Ref: GB045012

Knauf Insulation LtdPO Box 10 Stafford RoadSt HelensMerseysideWA10 3NS

www.knaufinsulation.co.uk

Tel: 01744 766 600

DisclaimerKnauf Insulation have a policy of continuous product development, therefore product information may change without notice.

Wherever possible, products are manufactured to the appropriate British Standard (BS), or harmonised European Standards, (BS EN) and are supplied subject to our Terms and Conditions of Sale, a copy of which is available on request. Information within this bookThe designs and detailing shown in this publication are illustrative only, although every effort has been made to ensure the accuracy of all textual and pictorial content.

Knauf Insulation, its employees and authorised agents can accept no liability whatsoever, either indirectly or directly arising from the use of its products in connection with any information or advice contained in this book. It is the responsibility of Designers, Clients and Installers to check that installations achieve the appropriate standard and comply with the relevant Building Regulations. The most up to date British or European standards should be referenced at all times.

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

Email: [email protected]

Documents

Section 6 · • Ease of cutting and fixing: Rock mineral wool ... light gauge steel angles. Knauf Insulation recommend the use of Knauf Drywall Screws, essential for fast construction,