How Wood is Pressure Treated

In the pressure-treatment process, lumber is loaded into a horizontal cylinder. The cylinder door is sealed, and a liquid preservative solution is pumped in. The pressure in the cylinder is then raised, forcing the preservative into the wood. At the end of the process, the excess treatment solution is pumped back to a storage tank for reuse. Because this treatment renders the wood useless as a food substance for fungi, termites and other wood-destroying agents, the wood is protected and is much less subject to deterioration. ​

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