Which type of wood treatment ensures long-lasting wood protection?

Deep penetration with preservatives is considered the most effective type of wood treatment for ensuring long-lasting protection. This method involves applying preservatives that penetrate deeply into the wood fibers, providing thorough protection against decay, insects, and other forms of deterioration. The deep penetration ensures that the preservative is not just on the surface but reaches the inner layers of the wood, extending the life of the material significantly.

Surface coatings primarily provide a barrier on the wood's exterior, which can wear away over time due to environmental exposure, leading to a need for frequent reapplication. Thermal treatment modifies the wood through heat, which can improve its resistance to certain pests and moisture, but may not be as effective against all types of decay in the long term. Pretreatment with synthetic oils can offer some level of protection, but typically does not penetrate as deeply as preservatives, making it less effective for long-term durability in comparison to methods that ensure deep penetration. Therefore, using preservatives that penetrate deeply offers a comprehensive solution, resulting in extended protection against various wood-destroying factors.