Outdoor Treatment

Core worker

Outdoor treatment, also known as Chromated Copper Arsenate treatment, is a wood preservation method used to protect wood from decay, insects, and other wood-damaging organisms. Outdoor treatment involves impregnating the wood with a solution of copper, chromium, and arsenic compounds.

Outdoor Treatment Process

1. Wood Preparation

The wood to be treated is typically first seasoned to reduce its moisture content. This helps ensure effective penetration of the preservative solution. The wood may also be surface cleaned to remove any dirt or debris.


2. Treatment vessel

The wood is placed in a treatment vessel, which can be either a pressure treatment cylinder or a vacuum chamber.

3. Vacuum phase

In the vacuum chamber method, air is removed from the chamber to create a vacuum. This step helps remove air from the wood cells, allowing better penetration of the preservative solution.

4. Pressure treatment

Once the vacuum phase is complete, the preservative solution is introduced into the treatment vessel. In the pressure method, pressure is applied to force the preservative solution into the wood cells. The pressure is maintained for a specific period to ensure adequate penetration.

5. Solution drainage

After the desired treatment time, the excess solution is drained from the treatment vessel, and the wood is allowed to drip dry.

6. Fixation

The treated wood is then left to fix or dry in a controlled environment. During this time, the preservative components react with the wood fibers, providing long-term protection against decay and insect infestation.

Outdoor Treatment Products

Utility Poles

Outdoor treated wood is commonly used for utility poles due to its durability and resistance to decay and insect attack. The treatment helps extend the lifespan of the poles, ensuring their structural integrity.


Fence Posts and Rails

Outdoor treated wood is widely used for fencing materials, including posts and rails. It helps protect the wood from rot caused by exposure to soil and moisture.

Decking and Outdoor Structures

Outdoor treated wood can be used for outdoor decking, pergolas, gazebos, and other outdoor structures. The treatment provides protection against weathering, decay, and insect damage.

Laying floorboards
Retaining wall

Retaining Walls:
Outdoor treated wood is suitable for retaining walls, where it helps withstand moisture and soil contact, preventing deterioration over time.

Marine Applications:
Outdoor treated wood is used in marine environments, such as for dock construction, boat ramps, and pilings. The treatment helps protect the wood from water-related damage, including decay and marine borers.

Boardwalk over water
Cow shelter

Agricultural Applications

Outdoor treated wood is used in agricultural settings for applications like vineyard posts, greenhouse structures, and livestock fencing. The treatment provides resistance to decay and insect attack in these demanding environments.