s p e c i f i e r s a n d b u i l d e r s g u i d e · 2015. 1. 12. · as3566 class 3 and 4 are...
TRANSCRIPT
June 2010(Replaces November 2005)
S P E C I F I E R S A N D B U I L D E R S G U I D E
Description •
Quality Accreditation 1
Design for Durability 1
AnimalShelters 1
Corrosion 2
Run-offfromInertMaterials 3
DrinkingWater 4
EdgeSealingofCOLORSTEEL®Products 4
ExpansionAllowanceandTemperature 4
FixingsandFasteners 5
Flues–Domestic/Industrial 6
FootTrafficonRoofs 6
FumeExtractorsandVents 7
GeothermalAreas 7
MixingofBrands 8
Overpaintingof COLORSTEEL®PrepaintedSteelProducts 8
ProcessingPlants 8
ProfileBendDiameters– Roofing,WallCladdingandAccessories 9
SolarHeatingPanelsorRubberMats 9
SwarfStainingofRoofingandCladding 10
UnwashedAreas 10
WaterPonding 12
WeatheringofCOLORSTEEL®Products 12
New Zealand Steel Limited Products and the New Zealand Building Code 13
ConformingwiththeBuildingCode 13
ExternalMoistureE2/AS1 13
Fire:“OutbreakofFire”– BuildingCodeC/AS1 13
ControlofExternalFireSpread 14
Maintenance 14
Environmental Categories and Product Recommendations 15-18
SpecialEnvironments 19
CommercialWarranties 20
Installation Information 21
InformationtoHelpAvoidProblems 21
Technical Features 22
CorrosionProtection 22
UVProtection 22
Profile Design Information 23
How to Specify New Zealand Steel Limited Roofing and Cladding Products 23
FurtherCoating/SurfaceOptions 23
FurtherInformation •
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DESCRIPTIONDESCRIPTION
NewZealandSteelproducesarangeofcoatedsteelproducts.
COLORSTEEL®prepaintedsteeldescribesthosesteelbuildingmaterialswhichhaveoven-curedpaintappliedtoagalvanisedorZINCALUME®steelbaseonacontinuous‘coiltocoil’operationattheNewZealandSteelGlenbrookworks.
Theprepaintingprocessgivesexcellentadhesionofthecoatingtothesubstrate,allowingrollformingtobeperformedafterpaintingwithoutdelaminationordeteriorationofthepaintfilm.
AvarietyofCOLORSTEEL®prepaintedsteelcoatingtypesisoffered.AllCOLORSTEEL®productsareproducedusingeitheraZINCALUME®steelsubstratewithanAZ150orAZ200coatingclass,(i.e.:150g/m2or200g/m2ofzinc/aluminiumalloy),oragalvanisedsteelsubstratewithaZM275coatingclass(i.e.275g/m2ofzinc).
DatasheetsoneachoftheCOLORSTEEL®prepaintedsteelcoatingtypesmaybeobtainedfromNewZealandSteelLimitedoranystockistsofCOLORSTEEL®prepaintedsteel.
COLORSTEEL®MAXX™productshaveaZINCALUME®coatedsteelbase.ThisproductisintendedforVerySevereenvironments.
COLORSTEEL®ENDURA™prepaintedsteelhasaZINCALUME®coatedsteelbaseandisavailableinarangeofcolours,selectedfortheirabilitytoprovideoptimumperformance,durabilityandappeal.
ZINCALUME®zinc/aluminiumalloy–coatedsteelhasa45%zinc,55%aluminiumalloycoatingwhichofferssuperiorcorrosionresistancecomparedtogalvanisedsteelinmostenvironments(particularlycoastalenvironments).
TraditionalgalvanisedsteelisofferedunderthetradenameofGALVSTEEL™.Thismaterialhasa100%zinccoatingandisavailableinarangeofdimensions,grades,zinccoatingweightsandtypes.
AXXIS®SteelforFramingisabrandofgalvanised,high-tensilesteelsuppliedforsteelframesandtrusses,usedinresidentialandsimilarconstruction.
DatasheetsoneachoftheCOLORSTEEL®prepaintedsteelcoatingtypesmaybeobtainedfromNewZealandSteelLimitedoranystockistsofCOLORSTEEL®prepaintedsteel.
Wherethereisarequirementforaverydurableproductwithhighaestheticappealandlowcostsofinstallationandmaintenance,thenCOLORSTEEL®prepaintedsteelproductsshouldbespecified.
Eachproductisdesignedforapplicationinaspecificenvironment.Theseapplicationsarediscussedundertheheading“TheNewZealandBuildingCode”laterinthispublication.
QUALITY ACCREDITATIONQUALITY ACCREDITATION
TheNewZealandSteelLimitedPaintLinereceivedaccreditationtoISO9002inApril1992andhassubsequentlybeenupgradedtoISO9001sinceJuly1993.Anon-goingprogrammeofcontinuousimprovementwillensurethatpracticeatNewZealandSteelLimitedcontinuestoreflectthebestavailableinternationaltechnology.
DESIGN FOR DURABILITYDESIGN FOR DURABILITY
Designhasamajorimpactonthedurabilityofthebuilding.Agooddesignwillensurethatyouwillgetthebestpossiblelifefromyourbuildingandreducemaintenancecosts.
The following design elements are presented alphabetically with guides to provide improved durability.
ANIMAL SHELTERSANIMAL SHELTERS
Someagriculturalapplicationsmaycreateinternalenvironmentsinwhichthebuild-upofpollutantsorfumesisapotentialsourceofcorrosion.Acorrosiveammoniaenvironmentcandevelopwithinshedsusedforintensiveanimalfarming.
ZINCALUME®,COLORSTEEL®ENDURA™orCOLORSTEEL®MAXX™shouldnotbeusedforthisapplication.
Design Guide:Design Guide:
1. ContactNewZealandSteelLimitedforspecialistadvice.
2. ZINCALUME®STEELORCOLORSTEEL®SHOULDNOTBEUSEDINTHISENVIRONMENTDUETOEXTREMECORROSIONRISK.
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CORROSIONCORROSION
Dissimilar Metals CorrosionDissimilar Metals Corrosion
Whentwodifferentmetalsareincontactandmoistureispresent,onemetalisrelativelyprotectedwhiletheothersuffersacceleratedcorrosion.Thisisknownasgalvanicorbi-metalliccorrosion.Asimilareffectcommonlyoccurswithwaterflowingoverdissimilarmetals.
Thisformofcorrosioniscommonlyfound:
1. Wherewaterisdischargedfromcopperorbrasssystemsoveragalvanised,orCOLORSTEEL®prepaintedsteelorZINCALUME®coatedsteelroof.
2. WhereunpaintedleadflashingsareapplieddirectlytoZINCALUME®coatedsteelproducts.(ReferInformationBulletinNo.2“FlashingMaterials”).
3. Wherefastenersareincompatiblewiththeroofingmaterial.(SeeFixingsandFasteners,page5).
Design Guide:Design Guide:
1. SeparatedissimilarmetalsbyusingabarriersuchasPVCtape,neutralcuresiliconesealant oranappropriatepaintsystem.
2. Preventpotentialrun-offfromcopperorbrasspipesoverGALVSTEEL™,ZINCALUME®coatedsteelorCOLORSTEEL®prepaintedsteelsurfacesbydivertingthedischargeclearoftheroofing.CopperpipesmustbeisolatedfromAXXIS®SteelforFraming.
Note: Coastal areas
with high salt levels
and high humidity
will increase the
possibility of
dissimilar metals
corrosion.
Compatibility
More Active Metals
More Noble Metals
Thischartlistscommonlyusedmetalsina“GalvanicSeries”.Ifanyofthesemetalsareindampcontactorarun–offsituation,themetalhigheronthetablewillsacrificeitselftoprotectthemetalloweronthescale.Thereforethesimpleruleistorememberthatyoucanrunwaterdownbutnotuphill.Forexample,zinctocopperisalrightbutcoppertozincisnot.
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ZINC ZINCALUME®
ALUMINIUM
STEEL
LEAD
COPPER
STAINLESS STEEL
RUN-OFF FROM INERT MATERIALSRUN-OFF FROM INERT MATERIALS
Thezinccoatingongalvanisedsteelproductsdevelopsaprotectivesurfacefilmasaresultofnaturalweathering.ThisprovidesthelongevityofperformancewhichwehavecometoexpectfromGALVSTEEL™products.
Whenflowingovergalvanisedroofing,rainwaterdissolvessmallamountsofmineralsandsaltsfromthezincsurface.Thesemineralsandsaltspromoteandmaintaintheprotectivefilmandenhancethecorrosionresistanceofdownstreamgalvanisedsteelproducts(eg:lean-toroofs,guttersandvalleys).
Howeverwhenrainwaterflowsover,oriscollectedfromroofingmaterialswhichdonotpromotethisprotectivefilm(INERTMATERIALS),acceleratedcorrosionofunpaintedgalvanisedsteelroofsandgutterscanoccur.
SomeExamplesofInertMaterials:
•ZINCALUME®steel•Glass•Fibreglass•COLORSTEEL®prepaintedsteel•GlazedTiles•PVC•Acrylic•Aluminium
Design Guide:Design Guide:
1. Ongalvanisedroofing,runskylightsdowntothegutter.
2. ToachievemaximumlifefromyourrainwatergoodswerecommendthattheyaremanufacturedfromeitherZINCALUME®steelorCOLORSTEEL®prepaintedsteelproducts.
3. Unpaintedgalvanisedsteelmustnotbeusedforroofingorrainwatergoods,includingvalleysandgutters,tocollectwaterrun-offfromZINCALUME®coatedsteelproductsoranyotherinertmaterial.
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DRINkING WATERDRINkING WATER
RainwatercollectedfromroofscladwithproductsmadefromGALVSTEEL™,ZINCALUME®coatedsteelandCOLORSTEEL®prepaintedsteel,willcomplywiththeprovisionsofNZBCG12.3.1,providedthewaterisnotcontaminatedfromothersources.
Thefirst25mmofrainfallfromanewlyinstalledroofmustbediscardedbeforedrinkingwatercollectionstarts.
Whereapaintorpaintsystemisappliedtotheroof,itssuitabilityforthecollectionofdrinkingwatermustbeestablished.
EDGE SEALING OF COLORSTEELEDGE SEALING OF COLORSTEEL®® PRODUCTS PRODUCTS
EdgesealingofCOLORSTEEL®productsisnotrecommended.(SeeEnvironmentalCategoriesandProductRecommendationssection).
EXPANSION ALLOWANCE AND TEMPERATUREEXPANSION ALLOWANCE AND TEMPERATURE
Allroofingandcladdingissubjecttoexpansionandcontractionduetotemperatureextremes.Thisisparticularlyevidentwithdarkercoloursandlongspanswheretheexpansionmaybeasmuchas8.0mmfora10.0metresheet.Fixingsystemsmustallowforexpansionandaccommodatethelongitudinalmovementwhichresults.
Design Guide:Design Guide:
Typical Roof Temperatures Summer Average - Calm Conditions
INSULATED UNINSULATED
LightColours(egTitania)* 58˚C 48˚C
MediumColours(egMistGreen) 79˚C 67˚C
DarkColours(egKaraka) 92˚C 77˚C
*Light Colours include
unpainted galvanised
and ZINCALUME®
steel material.
Typical Roof Expansions
Basedon0.01mm/m/˚C
8METRERUN 12METRERUN 18METRERUN
LightColours* 5mm 7mm 11mm
MediumColours 6mm 10mm 14mm
DarkColours 7mm 11mm 17mm
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FIXINGS AND FASTENERSFIXINGS AND FASTENERS
Theselectionoftheappropriateformoffastenerisataskwhichshouldnotbesolelyinfluencedbycost.Fastenercostsareminimalrelativetotheoverallprojectandthereisnobenefittobegainedthroughtheuseofinferiorfixings.Thefastenerdurabilityshouldequalorexceedthatoftheroofingorcladdingproduct.
The“MetalRoofingandWallCladdingCodeofPractice”providessomeinformationonselection,fixingmethodsandplacementoffasteners.ThishandbookisavailableonrequestfrommembersoftheNewZealandMetalRoofingManufacturersIncorporatedorNewZealandSteelLimited.Moredetailedinformationcanalsobeobtainedfromfastenermanufacturers.
Design Guide:Design Guide:
1. FastenerperformanceshouldconformwiththerequirementsofAS3566(andAmendments)“Screws–SelfDrillingfortheBuildingandConstructionIndustries”.
2. Stainlesssteelandstainlesssteelcappedfastenersarenotrecommendedforusewith ZINCALUME®coatedsteelorCOLORSTEEL®prepaintedsteelproductsinallenvironmentsduetoincompatibility.
3. Lowcarbon,nonconductingsealingwashersarerequiredforusewithCOLORSTEEL®prepaintedsteelproductsandZINCALUME®coatedsteelproducts.
Theadviceofspecialistfastenermanufacturersisreadilyavailableandthesemanufacturers shouldbeconsulted,particularlywhereCOLORSTEEL®prepaintedsteelproductsaretobe fixedinVerySevereorSevereEnvironments.(seeEnvironmentalCategoriesandProduct Recommendations,page15).
4. Fastenerswithheavyzincorzinc-tincoatingsorzincalloycoatedheadscomplyingwithAS3566Class3and4arefullycompatiblewithallproducts.
5. FastenersusedonCOLORSTEEL®prepaintedsteelproductsshouldbefactorycoatedto provideanaccuratecolourmatchwithCOLORSTEEL®prepaintedfinishes.
6. Rivets: Rivets:
• UsealuminiumrivetsforjoiningallNewZealandSteelLimitedroofingproducts. (Ensurerivetisofasuitablestrengthforthepurpose.Refertoyourrivetsupplier).
• Monelrivetsarenotrecommendedastheyareincompatibleduetotheircoppercontent.
NR:NewZealandSteelproductnotrecommendedforexteriorapplicationsfortheseEnvironmentalCategories.
4: Heavyzincorzinc-tincoatingsorzincalloycoatedheadscomplyingwithAS3566.2–2002Class4.
3: Heavyzincorzinc-tincoatingscomplyingwithAS3566.2–2002Class3.
*Seepage16fordefinitionsofEnvironmentalCategories.
Note:
1. StainlesssteelfastenersarenotrecommendedforusewithZINCALUME®coatedsteelor COLORSTEEL®prepaintedsteelproductsinallenvironments.
2. Sealingwashersthatcontaincarbonblackfillerlevelsofmorethan15%byvolumemayleadtocorrosionofZINCALUME®steelandCOLORSTEEL®prepaintedsteelproducts.Therefore,allfastenersforNewZealandSteelroofingproductsshouldhavelowcarbon,non-conductingsealingwashers.
3. RefertoInformationBulletin10.
Fastener Recommendations
Environmental ISO GALVSTEEL™ ZINCALUME® COLORSTEEL® COLORSTEEL® Category* ENDURA™ MAXX™
Coastal:VerySevere C5 NR NR NR 4Severe C4 NR NR 4 4Moderate C3 3,4 3,4 3,4 3,4
Industrial:VerySevere C5 NR NR NR 4Severe C4 NR NR 4 4Moderate C3 3,4 3,4 3,4 3,4
Inland:Moderate C2 3 3 3 3,4
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FLUES – DOMESTIC/INDUSTRIALFLUES – DOMESTIC/INDUSTRIAL
Naturalgas,wood,coaloroil-firedheatersgeneratehighlevelsofsulphurcompounds.Whenventedoveraroof,particularlyindampconditions,sulphuricacidformswhichwillleadtoprematurecorrosionoftheroof,gutteringanddownpipes.
Design Guide:Design Guide:
1. Designtheheightofthefluetoallowcombustionby-productstobedissipated.
2. SpecifyaCOLORSTEEL®prepaintedsteelproductdesignedforverysevereenvironments.
3. Ensurethatheatersarerunasefficientlyaspossibletoallowcompletecombustion.
4. Regularlywashtherooftoremovecontaminants.
FOOT TRAFFIC ON ROOFSFOOT TRAFFIC ON ROOFS
Repeatedfoottrafficandthedraggingofmaintenanceorcleaningequipment,maydamagetheroofwhichwillreduceitslifeexpectancy.
Design Guide:Design Guide:
1. Designandinstallcatwalksandplatformsovertheroofwherenecessary.
2. Aluminiumorgalvanisedsteelcatwalksarerecommended.
3. Designcatwalksandplatformssoasnottocreateanunwashedorpondingareaontheroof.
4. Timbercatwalksandplatformswillcausepreferentialcorrosionofunderlyingroof.
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FUME EXTRACTORS AND VENTSFUME EXTRACTORS AND VENTS
Corrosivedustandparticlescanbereleasedthroughroofventsanddischargedontotheroofsurface.Theimmediateareaoftheroofadjacenttotheventisthenatincreasedriskofcorrosion.
Design Guide:Design Guide:
1. Installfilterelementstocontainhazardousmaterial.
2. SpecifyaCOLORSTEEL®prepaintedsteelproductdesignedforverysevereenvironmentsto beinstalledadjacenttothevent.
3. Considerapplyingasuitableprotectivecoatingtotheaffectedareaoftheroof.
4. Maintaincoaloroilfiredboilersorincineratorssothattheydonotdischargehighsulphur levelsovertheroofsurface.
5. Regularlywashtherooftoremovecontaminants.
GEOTHERMAL AREASGEOTHERMAL AREAS
Inareasofgeothermalactivity,hydrogensulphidesassociatedwithboreemissionscancausecorrosionproblems.Althoughheavierthanair,hydrogensulphidecanbedrawnintorainwaterdown-pipesandaccumulateingutters.Thiscanleadtocorrosionoftheguttersandtheroofoverhangs.
Design Guide:Design Guide:
1. Installawatertrapatthebaseofdown-pipes.
2. SpecifytheappropriateCOLORSTEEL®prepaintedsteelproduct.
3. ContactNewZealandSteelLimitedforspecialistadvice.
MIXING OF BRANDSMIXING OF BRANDS
Wheredifferentbrandsofprepaintedmaterialareusedonthesamebuilding,differencesincolour,glossandweatheringperformancemayappearobviouswithinashortperiodoftime.Thiswillbeduetothedifferentpaintformulationsusedbydifferentmanufacturers.
NewZealandSteelLimitedwillnotacceptliabilityforproblemscausedbythemixingofbrands.
Design Guide:Design Guide:
1. SpecifyeitherCOLORSTEEL®ENDURA™orCOLORSTEEL®MAXX™products.
OVERPAINTING OF COLORSTEELOVERPAINTING OF COLORSTEEL®® PREPAINTED STEEL PRODUCTS PREPAINTED STEEL PRODUCTS
COLORSTEEL®prepaintedsteelproductsaredesignedfordurability.However,allpaintcoatingswilldeteriorateovertime.Therefore,atsomestage,itwillbenecessarytorepainttoavoidseriousdeteriorationoftheproduct.
Themainconsiderationisthepaintcoatingintegritytoperformasuitablebondfortheoverpaintedsystemsothatthedurabilityofthenewcoatingsystemismaintained.
NewZealandSteel’sexperiencewouldindicatethatthisperiodtofirstrepaintisaround15years.However,localclimaticconditions,buildingdesignandpaintcolourcanhaveasignificantinfluenceontheperformanceofthepaintsystem.ThereforeyoumayneedtoconsultNewZealandSteelorourpaintsuppliers,PPGIndustriesNZLtd,tohelpassessthemostsuitabletimetorepaint.
COLORSTEEL®prepaintedsteelproductsmaybereadilyoverpainted,aftersuitablepreparation,foraestheticreasons.DetailedinformationisavailableintheNewZealandSteelLimitedInformationBrochure:OverpaintingNewandWeatheredSteelRoofing.
PROCESSING PLANTS PROCESSING PLANTS (IncludingSwimmingPools)
Somecommercialapplicationsmaycreateinternalenvironmentsinwhichthebuild-upofpollutantsorfumesareapotentialsourceofcorrosion.Plantswherechlorinevapoursarereleased(includingenclosedswimmingpools)shouldhaveadequateventilationtominimisetherisks.
Design Guide:Design Guide:
1. Wherepollutantsorhumiditylevelsarelikelytobehigh,allowforfrequentairchanges.
2. Passiveventilationmaybeinadequatetocopewiththeproblemandtheinstallationoffan systemsshouldbeconsideredandincorporatedatthedesignstage.
3. ContactNewZealandSteelLimitedforspecialistadvice.
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PROFILE BEND DIAMETERS – ROOFING, WALL CLADDING AND ACCESSORIESPROFILE BEND DIAMETERS – ROOFING, WALL CLADDING AND ACCESSORIES
NewZealandSteelLimitedproductsarecustomdesignedtoensuremaximumcompatibilitywiththeroll-formingprocess.Thepaintsystemsaredesignedtobedurableandadheretothemetalsubstratesothattheyarenotaffectedbygoodroll-formingpractices.However,tighttensionbendsinthefinishedproductshouldbeavoidedassmallcracksmaybeformedwhichexposethemetalsubstratetotheatmosphere.
For optimum corrosion performance no visible microcracking should be present in the finished product. Therearemanyfactors,substrate,paint,benddiameterandformingpractice,thataffectthetendencytomicrocrack.Therefore,itisnotpracticaltohaveafixedbenddiameterthatguaranteesnomicrocracking.
Mostproducts,formedinwelldesignedandoperatedequipment,willnothavemicrocracksattensionbends.Itisimportantthatvisualchecksformicrocrackingbemadeonthefinishedproducttoensureahighqualitystandardismaintained.
Productswithmicrocrackingonthetensionbendswillshowearliersignsofcorrosionwhenusedinunwashedareasinsevereenvironments.
Design Guide:Design Guide:
1. Theuseofcorrugatedprofilesinsevereand‘specialconditions’(e.g.Geothermal)willhelptoensuregreaterdurability.
SOLAR HEATING PANELS OR RUBBER MATSSOLAR HEATING PANELS OR RUBBER MATS
Duringtheinstallationofsolarheatingsystems,careshouldbetakentopreventanydamagetotheroofingmaterial.Becauseofthehightemperaturescreatedandtheincreasedcondensationwhichmayresult,careshouldbetakentomaintainanairspacebetweentheroofandtheheatingunit.Followmanufacturers’recommendationsconcerningtubedirectionandtheuseoffixingsupportbrackets.
FailuretodothismayinvalidateaCOLORSTEEL®prepaintedsteelproductwarranty.
Design Guide:Design Guide:
1. Neverplaceheatingelementsorplumbingunitsdirectlyontheroofsurface.Followthesystemsupplier’srecommendationsconcerninginstallation.
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SWARF STAINING OF ROOFING AND CLADDING SWARF STAINING OF ROOFING AND CLADDING
Swarfisthetermgiventosteeldebrisarisingfromcuttingorpiercingoperationswhenusingfrictionsaws,abrasivediscs,drillsetc.,onsteelroofingandcladdingproducts.Whilstcomprisingmostlyfinesteelparticlesmixedwithabrasive,inthiscontextswarfmayalsobetakentoincludeanyotherdiscardedsteelobjectssuchasrivetshanks,nails,screwsandnuts,whichmaycomeintocontactwithcoatedproducts;ie:COLORSTEEL®prepaintedsteel,ZINCALUME®zinc/aluminiumalloy-coatedsteelandgalvanisedsteel.
Swarfparticles,ifleftonthesurface,willcorrodeandcauseruststainswhichwilldetractfromthefinishedappearanceofaproject.Thesestainsareoftenmistakenforearlydeteriorationoftheroofingandcladdingitself.
Design Guide:Design Guide:
1. Neverleaveswarfmaterialonthecoatedsurface.Followtherecommendationsincludedin theNewZealandSteelLimitedInstallersGuideorInformationBulletin7.
UNWASHED AREASUNWASHED AREAS
Whencontaminantssuchaswindblownsaltanddustaccumulateonpaintedsurfacesandbecomedamp,corrosionwilltakeplace.Manywindblowncontaminantsabsorbmoisturewhenexposedtohighhumidityandtheirpresenceonsteelacceleratescorrosion.
Forthisreason,areasonabuildingwhichareseldomwashedbyrainareparticularlypronetoearlybreakdownofthematerial.
Thiseffectmayfirstbenoticedasawhitecorrosionproduct,typicallyseenontheundersideofgutters,canopies,roofventsoronshelteredareasandtheundersideofprofilesusedhorizontallyaswallcladding.Itwillbemorenoticeablewheretighterradiusbendshavebeenusedinrollforming.
Evenoncoatedsteelwherecorrosionreactionsaremuchslower,thepresenceofcontaminantsoverlongperiodsoftimewillincreasetherateofcorrosion.
Themaintenanceregimesforunwashedareas,necessarytomeetthedurabilityrequirementsoftheBuildingCode,areshownonpages17and18ofthispublication.
WhentheundersideofZINCALUME®steelandCOLORSTEEL®prepaintedsteelproductsisexposedinanunwashedarea,e.g.:canopies,verandas,eaves,leantobuildingsetc.,additionalmaintenance,abovethatspecifiedonpages17and18,isrequiredtoensuresatisfactoryperformanceoftheproduct.
Design Guide:Design Guide:
1. Everyeffortmustbemadeduringthedesignofthebuildingtoeliminateorminimiseshelteredoroverhangingareas.
2. ConsiderationshouldbegivenduringthedesignstagetoensuretheundersideofZINCALUME®steelandCOLORSTEEL®prepaintedsteelisenclosedandthereforenotexposedtotheenvironment.
3. Whereunwashedareascannotbedesignedout,specifyregularwashingoftheseareasas partofanongoingmaintenanceprogramme.Refertopages17and18forNewZealandSteelLimitedrecommendations.
4. Designconsiderationforeasyaccessmustbegiventoareasthatrequireregularmaintenance.
5. Ensureprofilebendsarenottighterthanthoserecommendedundertheheadingof“Profile BendDiameters–Roofing,WallCladdingandAccessories”,andthattherearenomicrocracksinthefinishedproduct.
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WATER PONDINGWATER PONDING
RoofsRoofs
Wheretheroofpitchislow,changesinroofloadingsmayresultinanegativepitchandconsequentlyleadtowaterponding.WaterpondingisdetrimentaltotheperformanceofCOLORSTEEL®prepaintedsteelproducts.Thefollowingconditionscommonlycausewaterponding:
• Over-spacedpurlins.
• Deformationoftimberpurlins.
• Placementofexternalloadssuchasairconditioningunits.
• Rigidfixingonlongspanswhichcausesdeformationoftheprofileasaresultof thermalexpansion.
Design Guide:Design Guide:
1. Neveruseapitchoflessthan3degreesortheminimumrecommendedfortheprofile,whicheverisgreater.Pitchesoflessthanthisinvalidatethewarranty.
2. Designtheroofaccordingtotheprofilemanufacturer’sspecifications.
3. Onminimumpitchroofs,ensurethatthegutterendofprofiledsheetsisturneddown.
4. Allowforthermalexpansiontopreventprofiledistortion.
5. Considertheuseofwalkwaystopreventdamagewheretheroofmaybesubjecttoheavyfoottraffic.
6. Ensureroofpenetrationsdonotblocktheflowofwaterfromtheroof.
Note:Pleasereferto“NewZealandSteelLimitedProductsandtheNewZealandBuildingCode”onpage13ofthispublicationunder“E2/AS1ExternalMoisture”
GuttersGutters
Guttersmustbeinstalledwithadequatefalltoensureallwateristransportedtoappropriatelylocateddownpipes.Pondingoccurswhenwaterremainsinthegutterwhenthefallisinadequate.Overtime,thiscausesdegradationtothecoatingandultimatelyleadstogutterperforation.Perforationofthegutterasaconsequenceofinadequatefallorpondinginvalidatesboththemanufacturerandproducerwarranties.Theinstallationanddownpipeconstructionshouldallowtheguttertodraincompletely.
Regularguttercleaningandmaintenanceisrequiredtoremoveleavesandotherdebristhatmayrestrictwaterflowtodownpipes.Particularcareshouldbetakenattheentrancetodownpipesandcorners,toavoidblockagesleadingtowaterponding.
Agutterprotectionsystem(oranyotherproduct)thatentrapswaterbetweenitselfandanysteelproductsurfaces,restrictingthecoatedsteel’sabilitytodry,isnotrecommendedandisanexclusionintheproductwarranty.
WEATHERING OF COLORSTEELWEATHERING OF COLORSTEEL®® PRODUCTS PRODUCTS
Allbuildingproductswillweatherovertime.TheweatheringofCOLORSTEEL®prepaintedsteelproductswillresultinchangestoglossandcolour.Factorswhichinfluencethechangeareenvironmentalpollution,UVlevels,buildingorientationandpaintcolour.
Design Guide:Design Guide:
1. Whenaddingtoanexistingbuilding,considerationshouldbegiventotheweathered appearanceoftheCOLORSTEEL®prepaintedsteelproductsintheolderpartofthebuilding.
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NEW ZEALAND STEEL LIMITED PRODUCTS AND THE NEW ZEALAND STEEL LIMITED PRODUCTS AND THE NEW ZEALAND BUILDING CODENEW ZEALAND BUILDING CODE
The New Zealand Building Code defines durability requirements for many elements of buildings. These requirements are outlined in section B2 Durability. In general, most roofing and cladding is required to last a minimum of 15 years (or a nominated period), to water penetration, but in some cases where the material has a structural function, the requirement may be for 50 years. This can be achieved with suitable maintenance.
The New Zealand Building Code calls for durability performance which is relative to both maintenance and to working environments. The following information will assist specifiers to relate these variables to New Zealand Steel Limited products.
CONFORMING WITH THE BUILDING CODECONFORMING WITH THE BUILDING CODE
ZINCALUME® steel and the substrate used to produce COLORSTEEL® prepainted steel products, have met the requirements of AS1397:2001 and are manufactured under a quality management system to monitor ongoing compliance with this Standard. ZINCALUME® steel has been appraised by BRANZ as being suitable as feed stock for the manufacture of roof and wall cladding systems, cladding accessories, spouting, downpipes and other rainwater goods.
EXTERNAL MOISTURE E2/AS1 EXTERNAL MOISTURE E2/AS1
Adequate PitchAdequate Pitch
The New Zealand Building Code provides an Acceptable Solution to the problem of roof pitch. The pitch figures shown in paragraph 8.4.5 of Acceptable Solution E2/AS1 are reproduced, in part, below for your convenience.
Refer specific enquiries to the Profile Manufacturer who may have an Alternative Solution.
Source: New Zealand Building Code: Acceptable Solution E2/AS1
Note: Where manufacturers have more stringent requirements, these should be followed to optimise performance and to avoid invalidating guarantees.
OUTBREAK OF FIREOUTBREAK OF FIRE
ZINCALUME® steel and COLORSTEEL® prepainted steel need not be separated from flues and chimneys. However, when formed into cladding products and associated accessories that are used in conjunction with or attached to heat sensitive materials, the heat sensitive material must be separated from chimneys and flues in accordance with the requirements of NZBC Acceptable Solution C/AS1 Part 9 for the protection of combustible materials.
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ROOF PITCH REQUIREMENTS
Product Minimum Pitch
For profiled metal roof cladding Sheet Length ≤ 18m > 18m
Corrugated (with end laps present) ≥ 10˚ Refer manufacturer
Corrugated (no end laps present) ≥ 8˚ Refer manufacturer
Trapezoidal (where the crest height is less than 27mm) ≥ 4˚ Refer manufacturer
Trapezoidal (where the crest height is 27mm or higher) ≥ 3˚ Refer manufacturer
Trough profile ≥ 3˚ Refer manufacturer
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CONTROL OF EXTERNAL FIRE SPREADCONTROL OF EXTERNAL FIRE SPREAD
ZINCALUME® steel and COLORSTEEL® prepainted steel formed into roof cladding profiles are suitable for use as an external roof cladding in all purpose groups in accordance with NZBC Acceptable Solution C/AS1 Paragraph 7.11.1.
ZINCALUME® steel and COLORSTEEL® prepainted steel formed into wall cladding profiles are suitable for use as an external wall cladding on all buildings in accordance with NZBC Acceptable Solution C/AS1 Paragraph 7.11.2a. This statement is conditional on any applied surface finish being no more than 1mm in thickness.
Specifiers should be familiar with the Acceptable Solution C/AS1 Part 7: Control of External Fire Spread, which covers vertical and horizontal spread of fire.
MAINTENANCEMAINTENANCE
All roofing and cladding products are subject to the cumulative effects of weather, dust and other deposits. Normal rain washing will remove most accumulated atmospheric contaminants from roofs. For wall cladding, manual washing every 3 to 12 months, depending on the paint system, is recommended in moderate to very severe environments to prevent accumulation of dirt, debris or other material not removed by rain washing. For areas that do not receive any or adequate rain washing (called unwashed areas) such as soffits, wall cladding under eaves, underside of gutters, fascias, sheltered areas of garage doors and unwashed roof areas, more extensive manual washing is required. Similarly, other High Risk areas, around flues, under television aerials or overhanging trees and sites prone to mould, lichen, bird droppings or debris, need to have regular manual washing.
Regular washing of COLORSTEEL® prepainted steel products increases the durability by reducing attack from airborne salts and pollutants. GALVSTEEL™ products and ZINCALUME® steel products will also benefit from routine washing.
COLORSTEEL® prepainted steel surfaces should be manually washed with water and a sponge or a soft nylon-bristled brush. For large areas it may be more appropriate to use water blasting at pressures up to 20MPa.
Overpainting of COLORSTEEL® prepainted steel products is discussed on Page 8 of this publication.
If New Zealand Steel Limited products are maintained according to the following recommendations, the requirements of the New Zealand Building Code B2 for 15 year durability for roofs and exterior walls will be met or exceeded.
Note:
1. TheNewZealandBuildingCodedurabilityrequirementdoesnotincludeaestheticappearance.
2. TheNewZealandBuildingCoderequiresadurabilityof15yearsminimum(withmaintenance)forroofing,includingvalleys,andwallcladdingproducts.Thismeansnomoisturepenetration duetoproductfailure.
3. TheNewZealandBuildingCoderequiresadurabilityof5yearsminimum(withmaintenance)forrainwaterproducts,guttersanddownpipes.Thismeansnoperforationduetoproductfailure.
4. NewZealandSteelLimitedproductsaredesignedtoexceedtheNewZealandBuildingCodeB2:durabilityrequirements.Continuedmaintenanceandoverpaintingwillgreatlyextend theultimatelifeofallproducts.
5. Wherea50yeardurabilityisrequiredORwhereaproductistobeusedinaggressiveinternalenvironments,NewZealandSteelLimitedshouldbeconsulted.
6. InIndustrialEnvironments,thetypeofpollutiongeneratedmayaltertheaboverecommendations.Ifindoubt,consultNewZealandSteelLimited.
ThefollowingmaintenanceinformationintheEnvironmentalChartisforguidanceonly.Eachproprietarybuildingproductshouldcarryitsownmanufacturers’recommendationsforusage.
NewZealandSteelLimitedwillnotacceptresponsibilityforproprietaryroofingandcladdingproductswhichdonotconformtoourrecommendationsformanufacturing,environmentaluseormaintenance.
ENVIR ONMENTAL CATEGORIES AND PRODUCT RECOMMENDATIONSENVIR ONMENTAL CATEGORIES AND PRODUCT RECOMMENDATIONS
Important:Asproductuseisdictatedbylocalconditions,seekadvicefromyourroofingsupplierorfixerforthebestNewZealandSteelLimitedproducttosuityourspecificenvironment.
ThefollowingfourpagespresentaguidetoNewZealand’senvironmentalcategories,theproductsrecommendedforspecificconditionsandresidentialroofingwarranties.
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ENVIRONMENTAL CATEGORIES AND PRODUCT RECOMMENDATIONSENVIRONMENTAL CATEGORIES AND PRODUCT RECOMMENDATIONS
SEVERE – ISO CATEGORy 4Characterisedby:• Lightsaltdeposits.
• Afrequentsmellofsaltintheair.
• Typicallystarts100-500metresfrombreakingsurfsuchasisfoundonexposedcoasts.
• Intheimmediatevicinityoflargeexpansesofcalmsaltwatersuchasharbourforeshores.
Thisenvironmentmaybeextendedinlandbyprevailingwindsandlocalconditions.
VERy SEVERE – ISO CATEGORy 550mfromhighwateronEastCoast,100mfromhighwateronWestCoast.
Characterisedby:• Heavysaltdeposits.
• Thealmostconstantsmellofsaltsprayintheair.
• Closetobreakingsurf(typically50-100metres)suchasisfoundonexposedcoasts.
Thisenvironmentmaybeextendedinlandbyprevailingwindsandlocalconditions.
COMMERCIAL WARRANTyCOMMERCIAL WARRANTySuchasschools,warehousesandbuildings,refertoNewZealandSteelLimitedfordetailsofcommercialwarranties.Maximumwarrantyofferedoncommercialbuildingsis15years.
IMPORTANTIMPORTANT•• Asproductuseisdictatedbylocalconditions,seekadvicefromyourroofing
supplierorfixerforthebestNewZealandSteelLimitedproducttosuityourspecificenvironment.
•• Guttersshouldbeinstalledaccordingtomanufacturer’sinstructions.
•• Unwashedandhighriskareas–manualwashingevery3months.
INTRODUCTION INTRODUCTION NewZealandhasawiderangeofenvironmentalconditions,fromtheharshWestCoastbeaches,totherelativeshelteroftheWaikatofarmingregion.Therefore,NewZealandSteelLimitedoffersarangeofsteelproductswhicharesuitableformostlocations.
Roofing
Wall Cladding
Gutters/downpipes
Fascia
Roofing
Wall Cladding
Gutters/downpipes
Fascia
Roofing
Wall Cladding
Gutters/downpipes
Fascia
50 metres0 metres
MODERATE INLAND – ISO CATEGORy 2Characterisedby:• Noobviousmarineorindustrialinfluences.
• Typicallymorethan1000metresfromtheexposedcoastsormorethan500metresfromindustrialemissions.
MODERATE COASTAL – ISO CATEGORy 3Characterisedby:• Littleornosaltdeposits.
• Theoccasionalsmellofsaltintheair.
• Typicallystarts500-1000metresfrombreakingsurfsuchasisfoundonexposedcoasts,ORintheimmediatevicinityofcalmsaltwatersuchasestuaries.
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VERy SEVERE COASTAL SEVERE COASTAL
100 metres 500 metres
18 years:coveringthepaintsurfaceagainstflaking,peelingandexcessivefade.30 years:againstperforationasaresultofcorrosion.15 years:coveringthepaintsurfaceagainstflaking,peelingandexcessivefade.15 years: againstperforationasaresultofcorrosion.10 years: coveringthepaintsurfaceagainstflaking,peelingandexcessivefade. 10 years: againstperforationasaresultofcorrosion.
10 years: coveringthepaintsurfaceagainstflaking,peelingandexcessivefade.15 years: againstperforationasaresultofcorrosion.
15 years:coveringthepaintsurfaceagainstflaking,peelingandexcessivefade.15 years: againstperforationasaresultofcorrosion.Not recommended
5 years: coveringthepaintsurfaceagainstflaking,peelingandexcessivefade. 10 years: againstperforationasaresultofcorrosion.5 years: coveringthepaintsurfaceagainstflaking,peelingandexcessivefade.15 years: againstperforationasaresultofcorrosion.
Notrecommended
15 years: coveringthepaintsurfaceagainstflaking,peelingandexcessivefade.20 years: againstperforationasaresultofcorrosion.15 years: coveringthepaintsurfaceagainstflaking,peelingandexcessivefade.15 years: againstperforationasaresultofcorrosion.10 years: coveringthepaintsurfaceagainstflaking,peelingandexcessivefade.10 years: againstperforationasaresultofcorrosion.10 years: coveringthepaintsurfaceagainstflaking,peelingandexcessivefade.15 years: againstperforationasaresultofcorrosion.
15 years: coveringthepaintsurfaceagainstflaking,peelingandexcessivefade.30 years: againstperforationasaresultofcorrosion.15 years: coveringthepaintsurfaceagainstflaking,peelingandexcessivefade.15 years: againstperforationasaresultofcorrosion.10 years: coveringthepaintsurfaceagainstflaking,peelingandexcessivefade.10 years: againstperforationasaresultofcorrosion.
10 years: coveringthepaintsurfaceagainstflaking,peelingandexcessivefade.15 years: againstperforationasaresultofcorrosion.
15 years: coveringthepaintsurfaceagainstflaking,peelingandexcessivefade.15 years: againstperforationasaresultofcorrosion.15 years: coveringthepaintsurfaceagainstflaking,peelingandexcessivefade.15 years: againstperforationasaresultofcorrosion.10 years: coveringthepaintsurfaceagainstflaking,peelingandexcessivefade.10 years: againstperforationasaresultofcorrosion.10 years: coveringthepaintsurfaceagainstflaking,peelingandexcessivefade.15 years: againstperforationasaresultofcorrosion.
Notrecommended
• Rainwashing
• Rainwashingplusmanualwashingeveryyear.
• Manualwashingevery6months.
• Manualwashingevery6months.
• Rainwashing
• Rainwashingplusmanualwashingevery3months.
• Manualwashingeverymonth.
• Manualwashingeverymonth.
• Rainwashing
• Rainwashingplusmanualwashingeveryyear.
• Manualwashingevery6months.
• Manualwashingevery6months.
• Rainwashing
• Rainwashingplusmanualwashingevery6months.
• Manualwashingevery3months.
• Manualwashingevery3months.
• Rainwashing
• Rainwashingplusmanualwashingevery6months.
• Manualwashingevery3months.
• Manualwashingevery3months.
WARRANTIES MAINTENANCE WARRANTIES MAINTENANCE
Greaterthan50mfrombreakingsurfontheEastCoast.Greaterthan100mfrombreakingsurfontheWestCoast.
MODERATE COASTAL MODERATE INLAND
15 years: againstperforationasaresultofcorrosion.
15 years: againstperforationasaresultofcorrosion.
10 years: againstperforationasaresultofcorrosion.
10 years: againstperforationasaresultofcorrosion.
Notrecommended
Notrecommended
• Rainwashing
• Rainwashingplusmanualwashingevery6months.
• Manualwashingevery3months.
• Manualwashingevery3months.
Notrecommended
Notrecommended
WARRANTIES MAINTENANCE
Nowarrantyapplies
Notrecommended
Notrecommended
• Rainwashing
• Rainwashingplusmanualwashingevery6months.Paintingmaybeadvisabledependingonthespecificlocation.
• Manualwashingevery3months.Paintingmaybeadvisabledependingonthespecificlocation.
• Manualwashingevery3months.Paintingmaybeadvisabledependingonthespecificlocation.
Notrecommended
Notrecommended
WARRANTIES MAINTENANCE
1000 metres
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SPECIAL ENVIRONMENTSSPECIAL ENVIRONMENTS
InNewZealandthereareareaswherelocalconditionscreateanincreasedlikelihoodofcorrosion.Specialconsiderationshouldbegiventomaterialselectionintheseareas.Theyinclude:
1. Geothermal Areas Hydrogensulphideassociatedwithgeothermalactivitycreatesacorrosiveenvironment.Variationsin
naturalactivityordraw-offfromsteamboresplustheeffectsofweatherconditionsmakethehighriskareashardtodefine.PleaseconsultNewZealandSteelLimitedforfurtherdetails.
2. West Coast, South Island Inthisarea,smokefromthecoalburningfiresmaycausehighconcentrationsofsulphurdioxideinthe
air.ThecombinationofthisandthehighrainfallfortheregioncreatesanaggressivesituationwhichmustbeconsideredwhenchoosingtheappropriateCOLORSTEEL®prepaintedsteelcoating.Theeffectsofaseverecoastalenvironmentaggravatethesituation.
Thisareacombinesthemostseverefeaturesofbothindustrialandcoastalenvironments.PleasecontactyourlocalsupplierforthebestCOLORSTEEL®prepaintedsteelproducttouse.
3. Internal Environments Somecommercialoragriculturalapplicationsmaycreateinternalenvironmentsinwhichthebuild-upof
pollutantsorfumesisapotentialsourceofcorrosion.Similarlyacorrosiveenvironmentcandevelopwithinshedsusedforintensiveanimalfarming.PleaseconsultNewZealandSteelLimitedforfurtherdetails.
4. Industrial Environments Closetocorrosiveindustrialemissionsandsubjecttoheavyfalloutfromthem.Pleaseconsult
NewZealandSteelLimitedforfurtherdetails.
Further AssistanceFurtheradviceontheselectionoftheappropriateproducttosuityourparticularlocationcanbeobtainedfromNewZealandSteelLimitedoryourlocalCOLORSTEEL®prepaintedsteelsupplier.
VERy SEVERE SPECIAL ENVIRONMENTS
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COMMERCIAL WARRANTIESCOMMERCIAL WARRANTIES
CommercialwarrantiesareissuedthroughtheRollformerbyNewZealandSteelLimitedandthetermsarespecifictoeachcontract.
Inordertoensuretheappropriateproductisspecifiedfortheintendedservicelifeinanygivenenvironment,NewZealandSteelLimitediskeentobeconsultedasearlyaspossibleinthedesignstagetoensurecorrectmaterialselectionandbackingbyanappropriatewarranty.
WarrantyapplicationsaregenerallymadethroughtheroofingmanufacturerandwarrantyperiodsandconditionsareassessedbyNewZealandSteelLimited.
Factorssuchasroofdesign,roofpitch,profile,coatingtype,internalandexternalenvironmentsandspecialconditions(suchasrequirementfor“CleaninPlace”)areallassessedatthetimeofthewarrantyapplication.Maintenancerequirementswillbespecifiedaspartofthewarranty.
DraftwarrantiesareavailablefromNewZealandSteelLimitedtosupporttendersforspecificprojects.Thetermsandconditionsofthedraftwillremainunchangedprovidingthatthetermsoftheprojectareunaltered.
Awarrantyisissuedonthesatisfactorycompletionofthecontract.InstallationmustbecarriedoutinaccordancewithNewZealandSteelLimited’srequirementsandaccordingtogoodtradepracticesasdetailedinthe“MetalRoofingandWallCladdingCodeofPractice”.
AsiteinspectionbyNewZealandSteelLimitedmaybecarriedoutpriortotheissuingofanywarranty.
Themaintenanceprogrammespecifiedinthewarrantymustbecompliedwithtovalidatethewarranty.P
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INSTALLATION INFORMATIONINSTALLATION INFORMATION
Detailsrelatingtotheinstallationofallproductsareprovidedinthe“InstallersGuide”.ThisbookletcoversNewZealandSteelLimited’srecommendationsforhandling,cutting,fixing,sealing,sitestorage,etc.AdditionalcopiesofthispublicationmaybeobtainedfromNewZealandSteelLimited.
INFORMATION TO HELP yOU AVOID PROBLEMSINFORMATION TO HELP yOU AVOID PROBLEMS
Inalmostallapplications,ZINCALUME®coatedsteelandCOLORSTEEL®prepaintedsteelwillout-performgalvanisedsteel.Therearehowever,asmallnumberofapplicationsforwhichgalvanisedsteelismoresuitable.
ZINCALUME® coated steel and COLORSTEEL® prepainted steel products must not be used for:
• Formworkincontactwithwetconcrete.
• Productstobeembeddedinconcrete.However,whereverysmallvolumesof concreteareinvolved(e.g.splashes)whichareabletocurequickly,thereislittle corrosiveeffect.
• Fertiliserstorageshedsandcontainers.
• Culverts,orwhereZINCALUME®coatedsteelmaterialisburiedintheground.
• Watertanks.
• Highlyalkalineenvironments(e.g.cementmanufacture).
• Coolroomproducts.
• Buildingsforintensiveanimalfarming.
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TECHNICAL FEATURESTECHNICAL FEATURES
CORROSION PROTECTIONCORROSION PROTECTION
Thelongestablishedmethodofprotectingsteelagainstcorrosionhasbeentoapplyacoatingofzinc(galvanising).Thezincsurfaceformsahard,imperviouslayerwhichlimitsfurthercorrosion.Thisprovidesforthelongevityofperformancewhichwehavecometoexpectfromgalvanisedsteelproducts.
Thezinccoatingalsopossessesanotherveryusefulproperty.Smallexposedsurfacesoftheunderlyingsteelsuchasscratchesorcutedgesdonotcorrodebecauseofaneffectknownassacrificialprotection.
ZINCALUME®steel,azinc/aluminiumalloycoating,providesasuperiorperformancetothatofgalvanisedsteel.Itcombinesthebarrierprotectionofaluminiumandthesacrificialprotectionofzinc,thusgivingthebestofbothworlds.
Itfollowsthatbycoatingthesesubstrateswithanaddedpaintsystem,thesteelcorewillbeprotectedforalongerperiod.ItisforthisreasonthattheCOLORSTEEL®prepaintedsteelcoatingsystemsweredeveloped.Eachcoatingisdesignedtoprotectthesubstratefromspecificenvironmentalconditions.
Cross Section of ZINCALUMECross Section of ZINCALUME®® Coated Steel Coated Steel
UV PROTECTIONUV PROTECTION
NewZealandexperiencessomeofthemostextremeUVconditionsintheworld.UVlightcancausebreakdownoftheresinusedinsomepaints.Thisleadstoerosionandchalkingofthepaintfilm.UVlightcanalsocausethebreakdownofpigments(particularlyorganicbasedpigments)resultinginfading.
Inresponsetothisthreat,anon-goingprogrammeofproductimprovementhasledtotheformulationofthecurrentCOLORSTEEL®prepaintedsteelpaintsystems.Thesesystemsutilisepigmentsandresinswhichhavebeenselectedfortheircolourstability,flexibilityanddurability.
ZINCALUME®
Steel Cladding.
PROFILE DESIGN INFORMATIONPROFILE DESIGN INFORMATION
Specificationsrelatingtoroofingandcladdingprofilesandpricingdetailsshouldbesoughtfromthespecialistroofingmanufacturersconcerned.New Zealand Steel Limited does not provide a rollforming service.
ProfiledesignsfromyourlocalsupplierwillspecifythegradeandBMTappropriatetoanycontract.
DefinitionsDefinitions
1. BMT:Basemetalthicknessisthethicknessoftheuncoatedsteelcore.Thefinishedthickness ofthematerialwillincreasebytheaccumulationofcoatingsduringmanufactureby NewZealandSteelLimited.
2. Grade:Themechanicalstrengthofthesteelsubstrateisexpressedinyieldstrengthvalues measuredinMPa.LowstrengthsteelmayberatedasG1,G250orG300.Astheyield strengthofthematerialincreases,sodothevalues,sothatG550hasthehigheststrength.
3. Span:Thedistancebetweenpurlins,asrecommendedbytheRollformerforeachparticularprofile.
HOW TO SPECIFY NEW ZEALAND STEEL LIMITED HOW TO SPECIFY NEW ZEALAND STEEL LIMITED ROOFING AND CLADDING PRODUCTSROOFING AND CLADDING PRODUCTS
• Product(ZINCALUME®,GALVSTEEL™,COLORSTEEL®ENDURA™,COLORSTEEL®MAXX™)
• Profile
• Colour(Whereapplicable)
• BMT(eg:0.40or0.55mm)
• Grade(eg:G300orG550)
FURTHER COATING/SURFACE OPTIONSFURTHER COATING/SURFACE OPTIONS
InadditiontotheproductsmakingupthestandardCOLORSTEEL®prepaintedsteelproductrange,NewZealandSteelLimitedproducenon-standardcoatingsforspecialapplications(eg:highreflectancefinishes).ForspecialisedoptionspleasecontactNewZealandSteelLimited.
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S P E C I F I E R S A N D B U I L D E R S G U I D E
NewZealandSteelLimited,PrivateBag92121,Auckland1142,NewZealand. Ph0-9-3758999 Fax0-9-3758213
BH957795W4347Y O U R L O C A L S U P P L I E RY O U R L O C A L S U P P L I E RY O U R L O C A L S U P P L I E R
NOTE: WithNewZealandSteelLimited’scommitmenttocontinuousimprovement, informationprovidedinthispublicationmaybesubjecttomodification.Atthetimeofpublicationwebelievetheinformationcontainedinthisdocumentisthebestavailable.Nonetheless,wereservetherighttomodifyanyproduct,technique,equipmentorstatementtoreflectimprovementsinthemanufactureandapplicationofcoilcoatedproducts.TheinformationissuppliedwithoutprejudicetoNewZealandSteelLimited’sstandardtermsandconditionsofsale. In theeventofanyconflictbetweenthis informationandthestandard termsandconditions, thestandardtermsandconditionsshallprevail.
ThiseditionoftheNewZealandSteelSpecifiersandBuildersGuidesupersedesallpreviouseditions.
Copyright©2010NewZealandSteelLimited.
FURTHER INFORMATION
Foradditionalinformation,literatureortechnicalassistance,pleasecontact:
COLORSTEEL®andZINCALUME®MarketingNewZealandSteelLimited PrivateBag92121,Auckland1142Telephone:0-9-3758999Facsimile:0-9-3758213FreePhone:0800100523EmailAddress:[email protected]://www.colorsteel.co.nz
GALVSTEEL™isatrademarkofNewZealandSteelLimited.
COLORSTEEL®isaregisteredtrademarkofNewZealandSteelLimited.
MAXX™isatrademarkofNewZealandSteelLimited.
isaregisteredtrademarkofNewZealandSteelLimited.
ENDURA™isatrademarkofNewZealandSteelLimited.ZINCALUME®isaregisteredtrademarkofBlueScopeSteelLimited.
AXXIS®isaregisteredtrademarkofNewZealandSteelLimited.