Premium 4x6 CCA Treated Lumber – Strong, Durable & Built to Last Our 4x6 CCA Treated Lumber is engineered for exceptional durability, strength, and weather resistance, making it an ideal choice for deck framing, fence posts, retaining walls, and structural supports. Pressure-treated with Chromated Copper Arsenate (CCA), this lumber provides long-lasting protection against rot, decay, termites, and fungal damage, ensuring reliable performance in outdoor environments. Whether for residential commercial or agricultural projects these sturdy beams deliver superior stability and longevity.? CCA Pressure Treatment &ndash Protects against moisture Available at MDH Lumber - Crofton Lumber in Nebraska and Akron Lumber in Iowa. Fast local delivery available.