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What is AC2 Lumber: A 2026 Technical Guide to Micronized Copper Azole Treated Wood

"Understanding treated wood products is critical for contractors, architects, and DIY homeowners embarking on outdoor building projects. When evaluating construction materials for decks, fences, and landscaping structures, AC2 lumber stands out as a primary industry standard. This comprehensive guide details the chemistry, structural ratings, fastener requirements, and practical applications of AC2 lumber to ensure structural longevity and compliance with modern building codes. AC2 lumber refers to wood that has been treated with Micronized Copper Azole (MCA), a pressure-treatment technology designed to protect wood from fungal decay and termi..."

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