When used outdoors, wood is susceptible to moisture, insects, and decay, making preservation treatment particularly important. Common preservation methods include pressure treatment, heat treatment, and surface coating protection.

Pressure treatment is the most widely used method, injecting preservatives deep into the wood to improve durability; heat treatment enhances stability by altering the wood structure at high temperatures; coating protection is mainly used for surface protection.

Preserved wood is widely used in outdoor decking, landscaping projects, and garden construction, such as boardwalks, pavilions, and fences.

The choice of preservation method should be based on the specific environment and budget considerations.