Wood sold at home improvement retailers that has undergone a preservation process involving the infusion of chemical solutions under pressure is designed for exterior use. This treatment protects the wood from decay, insect infestation, and fungal growth. The composition of these protective agents varies, but historically included chromated copper arsenate (CCA). Current formulations primarily utilize alkaline copper quaternary (ACQ), copper azole, and other copper-based preservatives, chosen for their effectiveness and reduced environmental impact compared to earlier treatments.
This treatment extends the lifespan of wood products significantly, reducing the need for frequent replacements and conserving natural resources. Its development and refinement have played a crucial role in enabling the construction of durable outdoor structures such as decks, fences, and playground equipment. Earlier formulations containing arsenic raised environmental and health concerns, leading to the adoption of safer alternatives while maintaining comparable levels of protection. The availability of treated lumber allows for cost-effective and long-lasting construction in environments where untreated wood would rapidly deteriorate.
