Back To Basics: What Is Treated Timber & Why Do We Need It?

Treated timber refers to timber that has undergone a process of preservative treatment to enhance its durability and resistance to decay, insect infestation, and other forms of deterioration. This treatment typically involves the application of preservatives to the surface or pressure treatment, where the preservatives are forced deep into the cell structure of the timber.

Treating timber is vital for ensuring its longevity and performance, particularly when used in outdoor or high-moisture environments. Untreated timber is susceptible to decay, rot, and insect damage, which can compromise its structural integrity and shorten its lifespan. By applying preservatives, you create a protective barrier that prevents these issues, prolonging the life of timber products and reducing the need for frequent replacement or repair.

Choosing the right use class is essential when selecting preservative treatments for timber. The Use Class system categorises timber usage based on the level of exposure to moisture and the risk of decay, helping to determine the appropriate level of protection required. Selecting the correct use class ensures that the treated timber is suitable for its intended application, whether it's for indoor use, above-ground exterior exposure, or ground contact.



One of the most critical use classes is Use Class 4 (UC4), which pertains to timber in ground contact exposed to soil or freshwater. This includes applications such as fence posts, retaining walls, and garden sleepers. Use Class 4 treatment involves a higher level of preservative treatment to protect the timber from decay organisms and moisture absorption. Typically, this treatment includes pressure impregnation with specialised preservatives that offer long-term protection against fungal decay and insect attack, ensuring the structural integrity and longevity of timber in contact with the ground.

In summary, treating timber with preservatives is essential for enhancing its durability and life span. By choosing the right use class and applying appropriate treatments, you can ensure that your timber products withstand the test of time and remain structurally sound for years to come. Whether it's a garden fence or a retaining wall, investing in preservative treatments is a proactive step towards preserving the integrity and longevity of your timber investments.

At the forefront of timber preservation, WJ Timber Treatments stands as a reliable provider of both low and high-pressure preservative treatments. With a commitment to quality, we offer comprehensive solutions to preserve timber. With expertise and large throughput capability, we play a crucial role in preserving the integrity and longevity of timber products, helping clients protect their investments for generations to come. We also have our own fleet of HGVs that can collect and deliver your timber, making us an all-in-one solution timber treatment service.