In the pressure-treating process, lumber is sealed in a tank, then a chemical solution is added to the tank. Pressure is thenapplied using a pump, which allows the chemicals to penetrate deep into the cell structure of the lumber. This makes pressure treating one of the most effective lumber preservation techniques.The purpose of pressure treated lumber is to preserve the lumber from rot and decay when it is outdoors or exposed. Pressure treated lumber will outlast untreated lumber due to its resistance against rot and decay caused by insects, mold and other elements.

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