SteepRoofs/-,,whichfastentheroofingtothedeck,:56:48AM688/Chapter16•-:56:51AMSteepRoofs/-:56:53AM690/Chapter16•Roofing•Zinc-,duetotheabsenceofhasadarker,dullerappearancethanhigh-anic(paint-)coatingsthatextendtheirlifebetweengaugeandactualmetalthick-isverysimilarinappearanceto—andexpectancyandprovideawiderangeness,ASTMstandardsdiscouragetheissometimesconfusedwith—alead--useofgaugenumberstospecifysheettinalloycoatedmetalcalledterne-num,metallic-coatedsteel(-coatedstainlesssteelthatisnolongerwithalloysofzincorzinc-aluminum),mendrelianceondecimalorfrac-manufacturedbutmaystillbefoundorzinc-tinalloycoatedsteel,andeven,,ferroussteelwithoutanyThethicknessofcoppersheetisnor-protective,oating.(Formallyspecifiedbyweight,expressedThemetalslistedaboveallformmoreaboutarchitecturalmetals,seeinouncespersquarefoot().self-protectingoxidecoatings(pa-pages505–508.)Aluminumisspecifiedsimplyindeci-tinas)thatprovidelong-lastingre-Thethicknessofsteelsheettra-,-ditionallyhasbeenspecifiedbygaugesheetsarelonger-lasting,lessproneallyinstalleduncoatedandallowed(alsospelledgage),asystemofwholetowavinessor“oilcanning,”,lessnumbersinwhichlowernumbersmoredifficulttoformintoshapes,expensivemetals,whicharenotascorrespondtogreatermetalthick-andmoreexpensivethanthinnerlong-l
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