How Wood is Treated

HOW WOOD IS TREATED

PRESSURE TREATING WOOD

Pressure treatment is a process that forces chemical preservatives into the wood. A treatment facility uses regionally specific wood such as Southern Yellow Pine, Douglas Fir, and Western Red Cedar.

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PRESSURE TREATING WOOD

Pressure treatment is a process that forces chemical preservatives into the wood. A treatment facility uses regionally specific wood such as Southern Yellow Pine, Douglas Fir, and Western Red Cedar.

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Pressure Treatment Process

  1. The wood is cut to size and then loaded into a large cylinder that has doors and rails on both ends.
  2. The cylinder is sealed, and an industrial vacuum removes all air from the cylinder.
  3. The cylinder is flooded with the preserve solution.
  4. Pressure is applied to the contents in order to force the preservatives into the wood.
  5. The cylinder is drained, and the industrial vacuum removes excess chemicals from the wood.
  6. The cylinder is then drained again, (removing excess chemicals,) and the wood is removed.
  7. End tags are placed on the treated wood and the wood is shipped to different vendors for resale.

Pressure treatment processes are commonly considered as the best solution to preserve timber life. Since the treatment environment is highly controlled wood penetration level can be adjusted and the same treatment process is used to make utility poles, railroad ties, structural framing, fence pickets, deck boards, and ground contact posts.

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