Pressure-treated wood is one of the building materials that have lots of myths and misconceptions. If you’re considering it for your new renovation project, you’ve come to the right place. Do you hate investing lots of money in lumber that won’t fit? Everyone does! Keep reading, and you’ll discover if you can use pressure-treated wood indoors and what the recommended process is. I will break down all of its features so you can make an informed decision! Without further ado, let’s jump right in!
What Is Pressure Treated Wood?
Pressure-treated wood is wood that has been treated with chemicals to help protect it from rot, insects, and other types of damage. The process of pressure treating wood involves placing the wood in a chamber where it is exposed to high pressure. This pressure forces the chemicals into the wood, where they bond to the cellulose fibers.
Until recently, the most common type of chemical used in pressure-treated wood was chromated copper arsenate (CCA). CCA-treated wood was often used in construction projects, such as decks, fences, and even playground equipment. Luckily, the Environmental Protection Agency (EPA) restricted the use of CCA in treated lumber in residential and commercial construction on January 1, 2004, as part of a voluntary agreement with the industry. This restriction applies to residential and commercial building projects, both large and small.

While CCA-treated wood is effective at protecting against damage, it is very toxic and harmful to the environment and human health. As a result, many companies have developed alternative treatments that are less toxic.
Nowadays, alkaline copper quaternary (ACQ) is the most widely used wood preservative for residential applications. Borates, copper azole, copper naphthenate, copper-HDO (Bis-(Ncyclohexyldiazeniumdioxy-copper)), and polymeric betaine, on the other hand, are approved for use in the treatment of residential lumber and timber.
MCA-Micronized Copper Azole-treated wood is a newer technology that offers many benefits over ACQ-treated wood. MCA-treated wood has a smaller environmental footprint because it uses fewer chemicals than ACQ-treated wood. MCA-treated wood is also safer to work with because the chemicals are locked inside the wood and don’t get into the air or water.
What Are the Dangers of Using Pressure Treated Wood Indoors?
Chemicals can be harmful if the treated wood is used indoors. The chemicals can off-gas, causing respiratory problems. They can also be absorbed through the skin. In addition, the treated wood may release harmful toxins if it is burned. Because of these things, you should think carefully about the risks before using pressure-treated wood indoors.
The most common chemical used in old pressure-treated wood is chromated copper arsenate (CCA). When CCA-treated wood is cut or burned, arsenic fumes are released into the air. Inhaling these fumes can cause irritation to the lungs and throat, and long-term exposure has been linked to cancer.
The most popular chemical currently used in pressure-treated wood is ACQ. Although ACQ does not contain arsenic, it releases fumes that can cause eye and skin irritation. In addition, ACQ-treated wood is more likely to splinter than other types of treated wood, which can pose a danger to children and pets. For these reasons, it is important to take care when using pressure-treated wood indoors.
Where Can I Use Pressure Treated Wood Indoors?
While it is most commonly used for outdoor projects like decks and fences, pressure-treated wood can also be used indoors in limited situations.
One common use for pressure-treated wood indoors is in basements and laundry rooms, where the wood can help to resist mold and mildew growth. Additionally, pressure-treated wood can be used for some framing applications, such as around windows and doors. However, it is important to note that pressure-treated wood should not be used for any application where it will come into direct contact with food or cooking surfaces, as the chemicals in the wood can be dangerous if ingested. Overall, pressure-treated wood is not a good choice for every indoor use, but it can be useful in some cases.
Are there Non-Toxic Pressure Treated Wood Types?
When it comes to pressure-treated wood, many people are concerned about the potential health risks associated with the chemicals used in the treatment process. In particular, the use of chromated copper arsenate (CCA) has come under scrutiny in recent years. However, it is important to note that there are now several arsenic-free and non-toxic alternatives to CCA on the market. These include ACQ, Copper Azole, Borates, Cyproconazole, and Propiconazole. Additionally, there are also a variety of viable substitutes for pressure-treated wood in the construction industry. Because of this, you don’t have to give up safety to get the benefits of pressure-treated wood.
What Are the Best Indoor Alternatives to Pressure Treated Wood?
When it comes to building materials, pressure-treated wood is often seen as the best option for outdoor use. However, there are a number of reasons why you might want to consider using alternative materials for your next indoor project. Pressure-treated wood is treated with chemicals that can be harmful to your health, and it may also off-gas over time, causing indoor air quality problems. In addition, pressure-treated wood is often considered to be less attractive than other options.
If you’re looking for an alternative to pressure-treated wood for your next indoor project, consider one of these options:
- Bamboo: Bamboo is a fast-growing grass that is naturally resistant to pests and rot. It’s also eco-friendly and sustainable, making it a great choice for eco-conscious builders.
- Composite lumber: Composite lumber is made from recycled plastic and wood fibers, and it doesn’t require any chemical treatments. It’s long-lasting and easy to take care of, and it can work just as well as pressure-treated wood.
- Hardwood: Hardwood is a classic building material that is prized for its beauty and durability. While it’s not as resistant to rot and pests as pressure-treated wood, it can be protected with regular sealant treatments. Some of the best indoor alternatives include white oak, cedar, cypress, and redwood. These woods are naturally resistant to rot and pests, making them a safe choice for indoor use. In addition, these woods are also very beautiful, adding a touch of elegance to any home.
Whatever material you choose for your next project, make sure to do your research to ensure that it will meet your needs. Pressure-treated wood has its place, but there are many great alternatives that may be better suited for your next indoor project.
Frequently Asked Questions about Pressure Treated Wood
Is It Safe to Burn Pressure-Treated Wood in a Fireplace?
No. Due to the fact that it is treated with chemicals, you should avoid burning pressure-treated wood in your fireplace. These chemicals can be released into the air when burned, and they can be harmful to your health. In addition, the chemicals can damage the lining of your chimney, and they can also pollute the environment. If you must dispose of pressure-treated wood, consult with a local waste management company.
What Are the Precautions when Working with Pressure Treated Wood?
The chemicals used in the treatment process are highly toxic and can be dangerous if not handled properly.

When working with pressure-treated wood, it is important to take the following precautions:
Always wear gloves when handling pressure-treated wood. The chemicals can be absorbed through the skin and cause irritation or even poisoning.
If you must cut pressure-treated wood, always wear a dust mask to avoid inhaling the sawdust. The chemicals in the wood can be released into the air when the wood is cut and breathed in, causing serious health problems.
Pressure-treated wood should never be burned, as the chemicals will be released into the air and pose a danger to both humans and animals. If you need to throw away pressure-treated wood, call your local waste management company to find out how to do it right.
By taking these simple steps, you can avoid health risks when working with wood that has been treated with chemicals.
Conclusion
The EPA does not recommend using pressure-treated wood indoors due to the potential risks associated with exposure to the chemicals used in the treatment process. If you choose to use pressure-treated wood indoors, take steps to reduce your exposure to the chemicals by wearing gloves and a dust mask and sealing any cuts or drilled holes.