![]() ![]() Pressure-treated bottom plates in slab-on-grade construction also offer weak links. Deck flashings will have to be either galvanized or copper. The weak links in the system with the new treatments are instances where there's a significant chance of using the wrong fastener or flashing. Aluminum corrodes quickly in the presence of high copper concentrations. Perhaps the most important point to keep in mind relating to copper-based wood treatments and galvanic corrosion is to avoid aluminum flashings altogether. As for nails and screws, many of the composite coatings that are currently available are still good for the new treatments (see to read about fastener recommendations), but you should verify this by carefully reading the label. Simpson's ZMax line and USP Structural Connectors' Triple Zinc line both are rated at G-185. But engineers suggest stepping up to the heavier G-185 coatings for hot-dipped galvanized products, and they recommend class ratings of 40 or above when using electrogalvanized fasteners, such as expansion bolts.Ĭurrently, G-185 is the best galvanized protection that you can buy. The G-60 and G-90 hot-dipped coatings are what we've been using until now. For example, a G-60 rating means that there's 0.60 oz. Hot-dipped galvanization ratings are based on the actual weight of the coating. Unfortunately, the fastener grades aren't always marked on the boxes of nails and screws.Įlectrogalvanized stock is rated with a class scale that ranges from 5 to 110. At the very least, you need to use better grades of galvanized fasteners. ![]() Due to the high risk of galvanic reaction between the copper-impregnated wood and any dissimilar metals, fasteners and flashings should be stainless steel and copper whenever possible. Most people already know that they should use corrosion-resistant nails, screws, and connectors when they're building with pressure-treated wood. Here is some info on pressure treated fastners. Good thing you don't get high winds like hurricanes or such in Georgia. Well you said you had just started to bolt down the sill so I assume there are no walls up yet. ![]()
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