The way timber is treated has a major impact on how long your fence will last. The two most common types of preservative treatment are pressure treatment and dip treatment, and it is important to understand the difference so you can choose the right option for your garden.

Pressure-treated timber undergoes a process where preservatives are forced deep into the wood under high pressure inside a sealed chamber. This ensures thorough penetration, giving long lasting protection against rot, fungi and insect attack. The result is timber that can last many years longer than standard untreated or dip-treated wood. Pressure-treated fencing is often slightly greenish in colour due to the preservatives and is the preferred choice for closeboard fencing, heavy duty panels and structural posts.

Dip-treated timber is immersed in a tank of preservative liquid, coating only the outer surface. Although this adds a layer of protection, it does not penetrate deeply. As a result, dip-treated fencing requires more frequent re-treatment, and if the coating wears away or is damaged, moisture can begin to penetrate the wood. Dip-treated fences may be more affordable upfront, but they tend to have a shorter lifespan, especially in damp climates like York.

The difference becomes even more important at ground level, where water exposure is highest. This is one of the reasons gravel boards are essential – they help protect panels from sitting directly in damp soil, prolonging the life of both pressure-treated and dip-treated boards.

Pressure-treated fencing is a better long-term investment and has become the industry standard for quality installations. Whether you’re choosing closeboard, heavy duty panels or timber posts, pressure treatment provides greater peace of mind and reduces the need for future maintenance.

During your site visit we can explain the differences in cost, lifespan and suitability for your specific project so you can choose the most durable and cost-effective option for your garden.