The quality mark of preservative treated wood must include which of the following?

The quality mark of preservative treated wood must include comprehensive information to ensure proper identification and safety. This includes the identification of the treating manufacturer, which helps in tracing the source of the wood and understanding the standards adhered to during the treatment process. Knowing the type of preservative used is crucial because different preservatives have varying levels of effectiveness against decay and insect damage. Additionally, indicating the minimum preservative retention (measured in pounds per cubic foot or pcf) ensures that the treated wood meets the necessary protection specifications for its intended use. By combining all of these elements—manufacturer identification, type of preservative, and minimum retention—the quality mark provides a complete overview of the wood's treatment which is essential for ensuring its reliability and safety in construction applications.