b'MOST CATHODIC / LEAST LIKELY TO CORRODEPlatinumGold isACQ(alkalinecopperquat),which Graphite appears a darker brown in colour. The key concernisthecoppercomponent,which Silver willdeteriorateuncoatedfasteners.The 316 Stainless steel (passive) CanadianWoodCouncilrecommendsa 304 Stainless steel (passive) minimumelectroplatedG-185designation coatedfastenerorhotdippedgalvanized Monel inaccordancewithASTM123(replacing Inconel (passive) ASTM A153). This should provide a level Nickel (passive) of protection against the preservative treat-ment, however, add in exposure to salt spray 70-30 cupro-nickel and the recommendation increases to stain-Silicon bronze less steel Type 304/305 or 316 to offer the Copper best service life. Note this also applies to any metals in contact with ACQ or copper azole Red brass (CA) PTW. Admiralty bronzeFastenersinstalledintoconcretehave Admiralty brass similar challenges, with the inherent mois-Yellow brass ture levels of concrete and various PH levels having an affect on the fasteners. In many Hastelloy C (active) cases, the resultant PH has a minimal effect, Inconel (active) however the physical act of driving into the Nickel (active) concrete can scrape some of the corrosion resistant coating.Naval bronzeMuntz metal Factor 3: Building LocationTin BC Building Code does not define where Lead acoastalenvironmentmayresultinsalt spray or when greater levels of anti-corro-316 Stainless steel (active) sive fasteners must be used. The only refer-304 Stainless steel (active) ence is made in Division B in 9.26.2.3 Nails, 400 Series stainless steelsentence 1: Nails used for roofing shall be corro- 50-50 lead-tin solder sion-resistantroofingorshinglenails 13% Cr stainless steel (active) conformingtoa)ASTMF1667, Niresist DrivenFasteners:Nails,Spikes,and Staples, or b) CSA B111, Wire Nails, Cast iron Spikes and Staples.Wrought iron A coastal environment for roofing entails Mild steel exposuretosodiumchloride,basically Cadmium airborne salts. Although there are a number of coatings/protection systems for fasteners Alclad available on the market, in the roofing envi-Aluminum ronment for attachment of sheet metal flash-Aluminum 2024 ings we generally have a choice of galvanized {G-60orG-90},electroplating{G-185 Aluminum 3003 coating} fasteners or stainless steel {Type Aluminum 6053 304/305, Type 316}. The use of galvanizing Galvanized steel / electroplating is more commonly seen in attachment of metal flashings for both ease Zinc ofuseandcost.Althoughcoatingsoffer Magnesium alloys a high level of protection, they are prone Magnesium todamagebothfromhandlingandfrom their intended use; being installed through MOST ANODIC / LIKELY TO CORRODE layersofmetalflashingand/ormaterial 34lROOFINGBC l FALL 2020'