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1、SECTIONTWELVEROOFSYSTEMSDaveFlickingerNationalRoofingContractorsAssociation(NRCA)TechnicalServiceSectionRosemont,IllinoisBuildingownersanddesignershavemanydeck,insulation,androofcoveringma-terialstochoosefromforlow-slopeandsteep-sloperoofsystems.Thevarioussystemsavailablecanfulfillawiderangeof
2、functions,suchasenergyconservation,acousticalandthermalinsulation,andwater,fire,andwindresistance.Theirabilitytodothisovertheirexpectedservicelifedependsongooddesign,qualitymaterials,goodapplication,andacommitmentbybuildingownerstomaintenance.Thissectionisintendedtogiveanoverviewofthefollowin
3、g:materialsforlow-slopeandsteep-sloperoofing(includingdeck,insulationandroofcoverings),keydesignconsiderations,application,warranties,maintenance,andreroofing.Attheendofthissection,alistoftradeassociations(Art.12.20)andalistofpublications(Art.12.21)isgivenforthosereadersinterestedinfurtherspec
4、ificinformation.ROOFMATERIALSAroofsystemisanassemblyofinteractingroofcomponentsdesignedtoweath-erproofand,normally,toinsulateabuilding’stopsurface.Theroofassemblyin-cludestheroofdeck,vaporretarderandroofinsulation(iftheyoccur),andtheroofcovering.12.1ROOFDECKSAgoodroofisdependentuponthestructu
5、ralintegrityofthedeckandcompatibilityofthedeckwiththeroofcoveringandothermaterialsattachedtoit.Followingaredescriptionsofcommonlyuseddecks.Cementitiouswood-fiberpanelsarecomposedoftreatedwoodfibersthatarebondedtogetherwithportlandcementorotherbinderandcompressedormolded12.112.2SECTIONTWELVEinfl
6、atpanels.Thesepanelsprovidesomeacousticalattenuationandsomethermalresistance.Lightweightinsulatingconcreteroofdecksandfillsareproducedonthejobsitebycombininginsulatingaggregates,suchasperliteorvermiculite,withportlandcementandwater.Anothervariationofthistypeofdeckisreferredtoas‘‘cellular,’’li
7、ghtweightinsulatingconcrete.Ratherthanusingaggregate,cellularconcreteisproducedwithafoamingagentthatcreatessmallaircellswithinthematrix.Thecompressivestrengthandthermalresistanceoflightweightinsulatingconcretedecksdependonthemixdesignandcomposition
