How is the wood treated with CCA?
Prior to treatment, small cuts are made into the surface of the wood to improve penetration of the preservative solution. The wood is then stacked and loaded into a sealed pressurization chamber where the wood’s natural moisture is removed by vacuum and replaced with the treatment solution which gives the wood a greenish tinge. The chamber is then pressurized, forcing the solution into the wood. A vacuum is used to extract any excess solution; the wood is removed from the chamber and left to dry naturally, at which time the wood preservative binds to the wood in the fixing process.
