I just stumbled onto this and it may be good to know if you build or repair decks.
The new ACQ CA-B or ACZA wood is 2.5 to 4 time more corrosiove than the old CCA. The galvanic corrosion is caused by the copper in the preservative. In very wet conditions the corrosion can start in a matter of weeks instead of years. The recommendation seems to be to wrap the ends of the joists and the length of the ledger board with a ice and water shield type membrane to separate the galvanized metal from the wood. Because the corrosion starts from the inside out its not noticeable until the strength of the hangers is compromised.
Anybody heard of this? wrapping the ends of joists and length of ledgers sounds like a PITA to me.
I just stumbled onto this and it may be good to know if you build or repair decks.
The new ACQ CA-B or ACZA wood is 2.5 to 4 time more corrosiove than the old CCA. The galvanic corrosion is caused by the copper in the preservative. In very wet conditions the corrosion can start in a matter of weeks instead of years. The recommendation seems to be to wrap the ends of the joists and the length of the ledger board with a ice and water shield type membrane to separate the galvanized metal from the wood. Because the corrosion starts from the inside out its not noticeable until the strength of the hangers is compromised.
Anybody heard of this? wrapping the ends of joists and length of ledgers sounds like a PITA to me.
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