Why do the new pressure-treatment preservatives (such as ACQ, CA-B, and ACZA) cause corrosion?
Galvanic corrosion occurs when two dissimilar metals come in contact in the presence of moisture. ACQ, CA-B, and ACZA are copper-based. Most metal deck components are galvanized, i.e. they are coated with zinc to improve their durability. When in direct contact and in the presence of moisture, the copper in the wood corrodes the zinc galvanizing layer.
Related Questions
- If the surface decking boards are also pressure-treated with ACQ, CA-B, and ACZA, would the fasteners attaching them to the joist corrode?
- How much more corrosive are the new pressure-treated wood preservatives (i.e. ACQ, CA-B, and ACZA)?
- Why do the new pressure-treatment preservatives (such as ACQ, CA-B, and ACZA) cause corrosion?
