What's The Difference Between Treated And Untreated Wood?

Have you ever wondered the difference between treated and untreated wood?

Wood can be categorized into two main types: untreated (normal) and treated, each offering unique benefits depending on the project.

Untreated wood, also called natural wood, has been cut, shaped, and sometimes sanded, but hasn’t been chemically altered. This type of wood is ideal for indoor projects like furniture, cabinets, and decorative items where exposure to moisture, insects, or other outdoor elements isn’t a concern. While it has a natural look and is safe for indoor use, untreated wood is prone to warping, cracking, or rotting if exposed to rain, humidity, or pests, making it less suitable for outdoor structures.

Treated wood, however, undergoes a special process to increase its durability. Through a pressurized treatment, protective chemicals penetrate deep into the wood fibers, making it resistant to rot, insects, and moisture. This process commonly uses preservatives like copper azole or alkaline copper quaternary (ACQ), which are effective in preventing decay and repelling insects. Treated wood is often used in outdoor applications like decks, fences, and playgrounds because it can withstand exposure to weather conditions far better than untreated wood.

One major distinction is water resistance: treated wood is highly moisture-resistant, reducing the risk of warping, splitting, or rotting in rainy or humid conditions. However, due to the chemicals it contains, treated wood is generally not recommended for indoor projects that involve direct contact with food, such as cutting boards or countertops, to avoid potential health risks. Additionally, when working with treated wood, wearing gloves and a mask is advised, as cutting or sanding it can release chemical particles that may be harmful if inhaled or touched directly.

For projects exposed to outdoor elements, treated wood offers durability and protection against decay and insects, making it ideal for structural or high-use applications. For indoor use, untreated wood provides a safer, more natural look and feel. Knowing the strengths of each type helps ensure projects are safe, durable, and long-lasting.

In summary, both untreated and treated woods serve distinct purposes, and selecting the right type depends on the project’s environment and desired longevity.