Timber Fence Treatment Processes

Timber is widely used in construction, landscaping, and fencing, and it performs well when it is protected against weathering, insects, and decay. Several treatment processes are used to strengthen and preserve wood, and each method has its own benefits depending on where the timber will be used.

Also read our blog on the different treatments used by UK manufacturers

Pressure Treatment

Pressure treatment is one of the most reliable ways to protect timber for outdoor use and performed when manufactured. The timber is placed in a sealed vessel where air is removed before a preservative solution is forced into the wood. This gives long lasting protection against moisture, insects, and rot. It is commonly used for fence posts, panels, decking, and any timber that may come into contact with the ground.

Vacuum Treatment

Vacuum treatment draws preservative into the surface of the wood without the deep penetration achieved through pressure treatment and performed when manufactured. It provides a fast and efficient surface level coating that protects against general weathering. It is often used for cladding, external joinery, and timber that does not require full depth protection.

Creosote Treatment

Creosote has been used for many years in industrial settings. It is applied under pressure and gives strong protection against rot and insect attack. Creosote treated timber is mostly used for agricultural fencing, utility poles, and railway sleepers. It is not usually chosen for domestic projects due to its strong smell and oily finish.  Read our blog on Creosote Fencing

Thermal Modification

Thermal modification uses controlled heat to change the structure of the timber and performed when manufactured. This improves stability and reduces moisture absorption without using chemicals. It is suitable for cladding and decorative outdoor features where a natural appearance is preferred. It is not recommended for timber that will be in direct contact with the ground.

Natural Oils and Stains

Natural oils, stains, and surface preservatives are applied to the outer layer of timber to improve resistance to weathering and enhance appearance. These treatments bring out the colour and grain of the wood and help protect against UV fading. They must be reapplied over time to maintain performance.

Choosing the Right Treatment

The best treatment depends on the environment the timber will be used in, whether ground contact is expected, and how long the timber is required to last. Pressure treatment is usually the strongest choice for structural or ground contact applications, while vacuum treatments, oils, and stains are often suitable for decorative or lighter use.

This blog was updated in February 2026