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What is AC2 Lumber: A 2026 Technical Guide to Pressure-Treated Wood Standards

"AC2 is a proprietary brand name for a specific type of pressure-treated lumber that utilizes an Alkaline Copper Quaternary (ACQ) preservative system. As of 2026, understanding the distinction between generic pressure-treated wood and branded systems like AC2 is essential for contractors, architects, and DIY homeowners tasked with structural integrity and long-term durability in outdoor construction. The Chemistry Behind AC2 Preservation The core of the AC2 system is its chemical composition. Unlike older formulations that utilized arsenic (CCA), AC2 relies on copper as the primary biocide to protect wood fibers against fungal decay, rot, and..."

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