Pressure Treated Lumber
Pressure treated lumber or wood, is any wood which has gone through a preservation process in which pressure is used in order to force the preservatives into the wood. Pressure treated lumber will be placed into cylinders which are then closed, and pressure or a vacuum is applied to the wood.
The reason pressure is used in creating pressure treated lumber is that a deeper and higher level of absorption of the preservative occurs in the wood.
Sometimes pressure treated lumber undergoes several treatments, in order to insure deepest penetration of preservatives into the pressure treated lumber. In the final step, a vacuum will be used to remove excess preservatives.
When to use Pressure Treated Lumber
It is always advisable to use pressure treated lumber in any exterior construction or in any situation where the wood or lumber might be exposed to moisture or humidity.
Pressure treated lumber resists water and is found in outside decks, ocean or fresh water piers, park benches, or any outdoor structure which has constant exposure to the elements. The preservatives in pressure treated lumber also are designed to resist insect infestation or fungal growth.