Treated wood is commonly used in construction for its durability and resistance to decay and pests. However, it’s important to be able to identify treated wood to ensure proper handling and disposal.

One way to identify treated wood is by looking for markings or labels on the wood itself. Treated wood will often have a stamp or marking indicating the type of treatment it has undergone, such as “ACQ” for alkaline copper quaternary or “CA” for copper azole.

Another method is to check the color of the wood. Treated wood tends to have a greenish or brownish tint, which is a result of the chemicals used in the treatment process. Untreated wood, on the other hand, will have a more natural wood color.

It’s also important to be aware of the potential hazards associated with treated wood, as some treatments contain chemicals that can be harmful if ingested or inhaled. Always wear gloves and a mask when handling treated wood, and be sure to follow proper safety precautions when working with or disposing of treated wood.

Check for Markings

One of the easiest ways to identify treated wood is by checking for markings on the surface. Look for stamps or tags that indicate the type of treatment used.common markings include “ACQ,” “CA,” “MCQ,” or “CBA,” which stand for different types of chemical treatments. These marks are usually found on the end grain of the wood or on the packaging.

Look for Specific Codes

Some treated wood may have specific codes or labels that indicate the level of treatment and the intended use of the wood. For example, wood treated for ground contact will have a different marking than wood treated for above-ground use. Check for these codes to ensure that you are working with the correct type of treated wood for your project.

Look for Green or Dark Stains

One way to identify treated wood is by looking for green or dark stains on the surface. These stains are typically caused by the chemical treatment process used to protect the wood from decay and insects.

In some cases, the stains may be more subtle and appear as darker areas on the wood. It is important to inspect the entire surface of the wood to ensure that the treatment is consistent.

Inspect the Color of the Wood

One way to identify treated wood is by inspecting the color of the wood. Treated wood often has a greenish tint or hue due to the chemicals used in the treatment process.

Untreated wood, on the other hand, typically has a natural brown or tan color. If you notice a greenish tint on the surface of the wood, it is likely that it has been treated with preservatives to protect it from decay and insects.

Smell the Wood

Another way to identify treated wood is by its smell. Treated wood often has a distinct chemical odor that can be easily detected. If you smell a strong, pungent odor when you are near the wood, it is likely treated with chemicals.

You can also try scratching the surface of the wood slightly and then smelling it. If you notice a strong chemical smell after scratching, it is a good indicator that the wood has been treated.

Table: Smelling Treated Wood

Method:	Result:
Smelling the wood directly	Strong chemical odor
Scratching the wood and smelling	Strong chemical smell after scratching

Ask for Documentation

When in doubt, always ask the supplier or retailer for documentation to confirm if the wood has been treated. Look for a stamp or label indicating the type of treatment used, such as “Copper Azole” or “ACQ”. It’s important to have proof of treatment to ensure the safety and quality of the wood you are using for your projects. If the supplier is unable to provide documentation, it is best to consider alternative sources for treated wood.

Use a Moisture Meter

One way to identify treated wood is by using a moisture meter. Treated wood often has a higher moisture content compared to untreated wood. By using a moisture meter, you can measure the moisture level of the wood to determine if it has been treated.

How to Use a Moisture Meter:

Step 1: Turn on the moisture meter and select the appropriate setting for wood.

Step 2: Press the pins of the moisture meter into the wood to obtain a reading. Make sure to test different areas of the wood to ensure accuracy.

Examine the Texture of the Wood

One way to identify treated wood is by examining the texture of the surface. Treated wood often has a smoother and more uniform texture compared to untreated wood. Treated wood may also have a slightly glossy or shiny appearance due to the chemicals used during the treatment process. Run your hand along the surface of the wood to feel for any slickness or residue, which can also be an indication that the wood has been treated.

Consider the Environment

When trying to identify treated wood, it’s important to consider the environmental factors that may have influenced the appearance of the wood. Treated wood may have a greenish tint due to the chemicals used in the treatment process or may have a shiny or oily appearance.

Chemical Smell

Another indicator of treated wood is a distinct chemical smell. If you notice a strong odor coming from the wood, it may be an indication that it has been treated with chemicals to protect it from rot and decay.

Consult a Professional

When in doubt about whether the wood you are dealing with has been treated, it is always best to consult with a professional. An experienced contractor or wood specialist will have the knowledge and expertise to accurately identify treated wood based on its appearance, smell, or markings. They can also provide guidance on how to safely handle and dispose of treated wood if necessary.

Benefits of Consulting a Professional

By consulting a professional, you can avoid potential health risks associated with treated wood exposure. They can help you make informed decisions about how to proceed with the wood in question, whether it is safe to use for your project, or if it needs to be removed and replaced with untreated wood. Additionally, a professional can offer advice on alternative options for your project that may be safer and more environmentally friendly.

Identify treated wood accurately	Receive guidance on safe handling	Avoid potential health risks
Make informed decisions	Explore alternative options	Ensure the safety of your project

Test the Wood

To determine if the wood has been treated, you can perform a simple test using a small amount of water. Place a drop of water on the surface of the wood and observe how it reacts. If the water beads up and sits on top of the wood, it is likely that the wood has been treated. If the water absorbs into the wood quickly, it is likely untreated. Additionally, you can also check for any signs of greenish tint, odor, or sticky residue on the wood, which are all indicators of treated wood.

Final Tips for Identifying Treated Wood

• Check for a greenish tint or staining on the wood surface, which can indicate the presence of copper-based treatments.
• Look for incisions or punctures in the wood, as treatment chemicals may have been injected into these areas.
• Examine the wood for any tags or stamps that indicate it has been treated, such as a stamp from the American Wood Protection Association (AWPA).
• If you suspect the wood has been treated, avoid burning it or using it for projects that involve direct contact with food or animals.
• When in doubt, consult with a professional or contact the manufacturer for information about the treatment process used on the wood.