Pressure treated lumber is lumber that has gone through a process that forces a chemical preservative deep into the wood. The wood product is placed into a large cylindrical holding tank, and the tank is depressurized to remove all air. The tank is then filled with the preservative under high pressure, forcing it deeply into the wood. After the tank is drained, the wood is removed from the tank and prepared for shipment to your local lumberyard (the remaining preservative is reused).
Kiln dried lumber is lumber that has been heated in a kiln so that it has a low moisture content. When the drying process is complete, the lumber usually has a moisture content of between 6% and 8%, making it significantly dryer than green lumber or air dried lumber. Many hardware stores and lumber companies stock such lumber for their clients, and this type of wood is ideal for a wide range of woodworking tasks.
When lumber is first harvested and cut, it is known as “green” because it has not been dried or treated. Green lumber is very moist, and if it is used as-is, it tends to warp as it dries and contracts. Therefore, most lumber companies dry their wood before offering it for sale, so that it will be ready to use. Drying it in a controlled environment is important, as it allows the wood to contract without warping. The lumber may also be treated with chemicals so that it will resist insects, mold, mildew, and rot; treated lumber tends to be slightly more expensive.
Engineered lumber is a high performance, consistent, reliable and environmentally responsible choice for building construction.
Engineered lumber products are fabricated wood pieces used to improve upon the normal capabilities of construction lumber. These products are composed of wood particles (veneer, wood chips, oriented strands, wafers, laminated dimensional lumber, and combinations thereof) bonded by long-lasting adhesives to ensure the structural integrity. Engineered lumber is available in both structural and architectural (appearance) grades that maintain physical uniformity and longevity