What must be done to the newly exposed surface of lumber cut in the field when treated according to AWPA C22?

The requirement for newly exposed surfaces of lumber cut in the field to be brushed, dipped, or soaked with copper naphthenate as per AWPA C22 is crucial for the preservation of the wood. Copper naphthenate is a wood preservative that helps protect the wood from fungal decay, insects, and other forms of deterioration that can occur when wood is cut and its protective treated surface is compromised. This treatment essentially re-establishes a protective barrier, ensuring that the integrity and longevity of the wood are maintained.

By applying copper naphthenate to the exposed surfaces, contractors prevent moisture intrusion and biological attack that can lead to significant structural issues over time. This practice is standardized because without it, the cut surfaces would be vulnerable to the same environmental factors that the original treatment aimed to protect against.

Choosing an alternative approach, such as leaving the wood untreated for natural weathering, would expose the lumber to risks that can lead to premature failure. Similarly, while painting with a sealant might seem protective, it does not provide the same level of protection against specific types of decay and pests as copper naphthenate does. Lastly, while sanding for smoothness can be important for aesthetic purposes, it does not address the need for protecting