Here comes my being an engineer again.
I know a lot of wood treatment. But, you don't even have to be an engineer to know that wood treatment protects wood from damage caused by insects, moisture, and decay fungi.
There are a number of different (chemical) preservatives and processes (also known as timber treatment or lumber treatment) that can extend the life of wood, timber, wood structures or engineered wood.
Three primary methods of wood treatment currently prevail: creosote pressure treated lumber, pentachlorophenol pressure-treated wood, and inorganic arsenical pressure-treated wood. The pressure-treating process is done by commercial facilities and made available to users in the final wood product. Copper napthenate, zinc napthenate, and tributyltin oxide are other wood treatment options that can be applied. All of these treatment processes involve dangerous chemicals.
Pressure treatments force preservative into wood under higher than atmospheric pressures. Treating wood with pressure is more common than all other methods combined. In many species, deeper and more uniform penetrations (especially across the grain) and higher retentions are possible than when using nonpressure methods. Penetration of 2.5 inches or more across the grain is possible in southern pine timbers. Properly pressure treated wood is recommended for use in situations of high decay hazard (ground line contact).
A wide variety of nonpressure treatments have been developed, each differing in the retentions and penetrations attained. Although some of the treatments give good results, they are generally not as satisfactory as pressure treatments. Nonpressure methods include the thermal process, vacuum treatment, double diffusion, cold soaking, and superficial applications.
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