What type of wood treatment uses pressure to force preservatives into the wood?

Pressure treatment is the correct answer because it involves using high pressure to drive preservative solutions deeply into the wood fibers. This method is highly effective in enhancing the wood’s resistance to moisture, insects, and decay, making it suitable for outdoor and exposed applications. The process typically occurs in a pressure chamber, where wood is placed and then subjected to a vacuum followed by pressurized preservative application, ensuring that the preservatives penetrate thoroughly.

Other methods, such as surface treatment, only apply preservatives to the outer layer of the wood and do not provide the same depth of protection. Dip treatment involves immersing wood in a preservative solution but does not ensure full penetration as effectively as pressure treatment. Brush treatment applies preservatives directly onto the wood surface with a brush, which again results in limited penetration and protection compared to the depth achieved through pressure treatment. Thus, pressure treatment is recognized as one of the most effective means of enhancing wood durability through the deep infusion of preservatives.