If you’re someone who’s about to start a DIY project that involves wood, you may have come across the terms ‘treated wood’ and ‘pressure-treated wood’. But what do these terms actually mean? And more importantly, what’s the difference between them?
The short answer is that all pressure-treated wood is treated wood, but not all treated wood is pressure-treated. Essentially, ‘treated wood’ refers to any type of wood that has been chemically treated to increase its durability and resistance to decay. On the other hand, ‘pressure-treated wood’ is a specific type of treated wood, which involves a more intense and controlled chemical treatment process.
The main difference between the two lies in the level and type of treatment they undergo. Treated wood is typically immersed in a solution of water and a chemical preservative, which is then allowed to penetrate the wood through a process called ‘incising’. Pressure-treated wood, on the other hand, involves forcing the preservative solution into the wood cells under high pressure, using a special cylinder. This process ensures that all parts of the wood are treated, including the difficult-to-reach areas.
Definition of Treated Wood
Treated wood refers to any lumber that has undergone a process of chemical treatment to improve its durability, resistance to decay, and insect infestations. This means that the wood has been treated with chemicals to prevent rot, fungal decay, and insects, making it lasts longer and withstands harsh weather conditions.
The process of treating wood involves impregnating it with preservatives that protect it from rot and insects that can damage the wood. The chemicals penetrate the wood fibers, making it more resistant to decay. Different types of wood require various treatment processes, and the chemicals used also vary depending on the species of wood. Some of the species of wood that are commonly treated include pine, spruce, hemlock, and fir.
The use of treated wood is prevalent in the construction industry, especially in outdoor structures such as decks, fences, and playgrounds. Treated wood is also used in landscaping, including retaining walls, raised garden beds, and borders. It’s an affordable and long-lasting solution that is widely available in lumber stores and home centers.
Definition of Pressure Treated Wood
Pressure treated wood, also known as PT wood, is a type of lumber that goes through a process where chemicals are forced into the wood to protect it against insects, fungus, and decay. The process involves placing the wood in a vacuum chamber and then applying pressure to force chemicals to penetrate the wood fibers.
- The treatment process involves the use of chemicals such as Copper Azole, Alkaline Copper Quaternary (ACQ), and Micronized Copper Quaternary (MCQ).
- The chemicals used in pressure treated wood vary depending on the function and intended use of the wood.
- Pressure treated wood is commonly used in outdoor applications such as decks, fences, and landscaping for its ability to withstand extreme weather conditions and prevent decay.
One of the significant benefits of pressure treated wood is that it significantly extends the life of the wood, making it a popular choice for outdoor wood structures. PT wood is an economical option for homeowners as it is readily available, easy to work with, and can be painted or stained to match a specific design aesthetic.
However, it is essential to note that while pressure treated wood is treated to resist decay, it is not invincible, and the chemicals used in the process may pose some health risks if not handled carefully. It’s important to follow proper installation and maintenance practices, such as wearing safety gear and refraining from burning or ingesting the wood, to ensure the safety of all involved parties.
Types of Pressure Treated Wood
There are different types of pressure treated wood available in the market. The most common ones are:
- CCA (Chromated Copper Arsenate) treated wood: This type of pressure treated wood is not commonly used anymore due to its potential health hazards, as it contains arsenic, which is a known carcinogen.
- ACQ (Alkaline Copper Quaternary) treated wood: One of the most widely used types of PT wood, this type uses copper to protect the wood from decay and insects. It’s an excellent option for above-ground applications but is not recommended for water contact.
- MCQ (Micronized Copper Quaternary) treated wood: This type of PT wood uses a micronized copper preservative that penetrates the wood deeply, providing better protection against weather, insects, and decay. It is eco-friendly and safe for both humans and pets.
Uses of Pressure Treated Wood
Pressure treated wood is an ideal option for outdoor structures that require protection against moisture, weather, and insects. Some popular uses include:
- Decks and porches
- Fences and gates
- Landscaping features such as retaining walls and flower beds
- Outdoor furniture
- Structures for playgrounds and outdoor recreational areas
| Benefits | Drawbacks |
|---|---|
| – PT wood is durable and resistant to decay which saves you money in the long run – It’s a versatile, economical, and readily available option – It can be easily painted or stained to match the desired aesthetic |
– If not installed and maintained correctly, it may pose health risks – Certain types of PT wood contain chemicals that are harmful to the environment and should not be burned or disposed of improperly – It may cause galvanic corrosion if used with certain types of metal fasteners |
Pressure treated wood is a popular option for homeowners due to its many benefits. With proper installation, maintenance, and care, PT wood can last for decades, making it an affordable and practical choice for outdoor wood structures.
Common Uses of Treated Wood
Treated wood is a type of lumber that has been infused with chemicals to enhance its durability and performance. This type of wood is commonly used in outdoor projects such as decks, fences, and landscaping structures. Here are some common uses of treated wood:
- Decking: Treated wood is a popular material for decking because it is resistant to rot, decay, and insects. It can withstand harsh weather conditions and can last for many years with proper maintenance.
- Fencing: Treated wood is also commonly used for fencing due to its resistance to decay and insect damage. It can provide privacy and security, and can be painted or stained to match the surrounding landscape.
- Landscaping: Treated wood can be used to construct various landscaping structures such as garden beds, retaining walls, and walkways. It is a cost-effective and durable option for outdoor projects.
In addition to these common uses, treated wood can also be used for building outdoor furniture, playground equipment, and other outdoor structures. It is important to note that not all treated wood is suitable for every application, so it is important to choose the right type of treatment and grade of lumber for your specific project.
Treated Wood vs. Pressure-Treated Wood
It is important to note that treated wood and pressure-treated wood are not the same thing. Treated wood has been treated with chemicals to enhance its durability and performance, while pressure-treated wood has been treated with chemicals under pressure to force them deeper into the wood. This process makes pressure-treated wood more resistant to decay, insects, and rot than regular treated wood.
While both types of wood are suitable for outdoor use, pressure-treated wood is usually the best choice for projects that will be in direct contact with the ground or exposed to moisture. Treated wood is more suitable for projects that are above ground and not exposed to moisture.
| Type of Wood | Uses |
|---|---|
| Treated Wood | Decks, fencing, landscaping structures |
| Pressure-Treated Wood | Ground contact, outdoor structures exposed to moisture |
Overall, treated wood and pressure-treated wood are both excellent choices for outdoor projects. They are cost-effective, durable, and easy to work with. By choosing the right type of wood and treatment for your specific project, you can ensure that your outdoor structures will last for many years to come.
Common Uses of Pressure Treated Wood
Pressure treated wood is a type of lumber that has undergone a preservative treatment process to protect it from damage caused by insects, fungi, and rot. But what are the common uses for this type of wood? Here are the top uses for pressure treated wood:
- Decking: One of the most common uses for pressure treated wood is for outdoor decking. Constructing a new deck with this type of wood ensures that it will have a long lifespan, even in harsh weather conditions.
- Fencing: Pressure treated wood is also a great material for fencing. It can withstand moisture and UV rays, making it a durable option.
- Landscaping: Pressure treated wood can be used for retaining walls, garden beds, and other landscaping features. Its durability and resistance to decay make it a popular choice for these projects.
Another popular use for pressure treated wood is for structural framing in building construction. But what makes pressure treated wood different from other types of treated wood?
While all types of treated wood are designed to resist decay and rot, pressure treated wood undergoes a more thorough treatment process. This involves placing the wood into a pressurized chamber and impregnating it with preservatives. This process ensures that the preservatives penetrate deep into the wood fibers, creating a more long-lasting protection against decay.
Here is a breakdown of the different types of pressure treated wood and their common uses:
| Type of Pressure Treated Wood | Common Uses |
|---|---|
| Ground Contact | Landscaping, retaining walls, posts, structural framing |
| Above Ground | Decking, fencing, exterior building lumber |
| Marine | Boat docks, piers, seawalls |
Now that you know the common uses for pressure treated wood, you can make an informed decision about whether or not it is right for your next project.
Chemicals Used in Treated Wood
Treated wood is typically made by applying chemicals to wood to improve its strength, durability, and resistance to decay, insects, and other hazards. These chemicals help to extend the longevity of wood and reduce the need for frequent maintenance, making treated wood ideal for outdoor projects, such as decks, fencing, and landscaping. The chemicals used in treated wood fall into four main categories:
- Alkaline Copper Quaternary (ACQ)
- Chromated Copper Arsenate (CCA)
- Copper Azole (CA)
- Micronized Copper Azole (MCA)
Alkaline Copper Quaternary (ACQ)
ACQ is a chemical blend of copper and quaternary ammonium compounds that protect against decay and insects. ACQ is widely used for residential and commercial applications and is considered safe for human contact and the environment. ACQ-treated wood has a greenish-brown color, but it can be stained or painted to match the desired look.
Chromated Copper Arsenate (CCA)
CCA is a chemical mix of chromium, copper, and arsenic compounds that provide excellent protection against decay, insects, and fungi. However, concerns about the toxicity of arsenic have led to a decrease in the use of CCA. CCA has a characteristic green color and is commonly used for industrial applications, such as marine structures and utility poles.
Copper Azole (CA)
CA is a copper-based chemical that is less toxic than CCA and offers excellent protection against decay and insects. CA-treated wood can be stained or painted and has a light brown color that will weather to a grayish color over time.
Micronized Copper Azole (MCA)
MCA is a micronized copper-based chemical that penetrates the wood deeper than other copper-based treatments, providing long-term protection against decay and insects. MCA-treated wood has a natural wood color that can be stained or painted.
| Chemical Treatment | Protection Against | Color |
|---|---|---|
| ACQ | Decay and insects | Greenish-brown |
| CCA | Decay, insects, and fungi | Green |
| CA | Decay and insects | Light brown |
| MCA | Decay and insects | Natural wood color |
When choosing treated wood, it’s essential to select the one that is safe for use in your intended application and meets the required building codes. It’s also essential to follow safety guidelines, such as wearing gloves, eye protection, and a dust mask, when handling treated wood to avoid exposure to the chemicals. Properly maintained treated wood can last for several years and provide a beautiful and durable outdoor living space.
Chemicals used in pressure treated wood
When it comes to treated wood, many homeowners and contractors may not be aware of the specific chemicals used in pressure treated wood. Pressure treated wood is infused with chemicals to make it resistant to pests, rot, and decay. These chemicals provide a long-lasting and durable product, but it is important to understand what they are and how they may affect the environment and human health.
- Copper-based chemicals: Copper is the most commonly used chemical in pressure treated wood. Copper-based chemicals include copper azole, copper quat, and ACQ. These chemicals penetrate the wood and protect against rot, decay, and termites. However, they can also leach into the soil and water, potentially causing harm to plants and aquatic life. Additionally, prolonged exposure to copper can cause health problems such as headaches, anemia, and kidney damage.
- Alkaline copper quat (ACQ): ACQ is a type of copper-based chemical that is treated with an alkaline solution. It is a popular choice for outdoor projects as it is effective against rot, decay, and termites. However, like other copper-based chemicals, it can potentially harm the environment and human health if not handled properly.
- Chromated copper arsenate (CCA): CCA was one of the most commonly used chemicals in pressure treated wood until it was phased out due to concerns about its toxicity. CCA contains arsenic, which can pose health risks if inhaled or ingested. It also poses environmental risks if it leaches into the soil and water.
It is important to note that pressure treated wood should never be burned as the chemicals released can be harmful if inhaled. Additionally, when handling pressure treated wood, it is important to wear protective gear such as gloves and a mask to minimize exposure to the chemicals.
Overall, while pressure treated wood is a durable and long-lasting option for outdoor projects, it is essential to understand the potential risks associated with its use. By being aware of the chemicals used in pressure treated wood, homeowners and contractors can make informed decisions about the products they use and how they handle them.
| Chemical Name | Risks |
|---|---|
| Copper azole | Leaches into soil and water, prolonged exposure can cause health problems |
| Copper quat | Leaches into soil and water, prolonged exposure can cause health problems |
| ACQ | Leaches into soil and water, prolonged exposure can cause health problems |
| CCA | Contains arsenic, poses health and environmental risks |
Understanding the chemicals used in pressure treated wood is essential for making safe and informed decisions about outdoor projects. By taking the proper precautions and handling pressure treated wood responsibly, homeowners and contractors can create durable and long-lasting structures while minimizing the potential environmental and health risks.
Safety precautions when handling treated wood and pressure treated wood.
Treated wood and pressure treated wood are commonly used in construction projects as they have added resistance against decay, insects, and natural elements.
However, it’s important to take certain safety precautions when handling these types of wood to avoid potential harm.
- Wear protective gear – When working with treated or pressure treated wood, it’s essential to wear protective gear such as gloves, safety glasses, and respiratory masks to prevent contact with harmful chemicals.
- Do not burn the wood – Burning treated or pressure treated wood releases toxic chemicals into the air that can cause respiratory irritation. It’s important to dispose of such wood in accordance with local regulations.
- Wash your hands – After handling pressure treated or treated wood, it’s important to wash your hands thoroughly with soap and water to avoid any contact or ingestion of chemicals.
These safety precautions should always be taken when handling treated or pressure treated wood to avoid any potential harm that can be caused by exposure to the chemicals present in these types of wood.
Comparison between treated wood and pressure treated wood
Treated wood and pressure treated wood are often confused with each other, but there are significant differences between the two.
Treated wood refers to wood that has been treated with a water-based solution that penetrates the wood surface to provide protection from termites, decay, and rot. This type of wood is commonly used for decking, fencing, and outdoor furniture.
On the other hand, pressure treated wood is made by placing the wood in a vacuum chamber, where a solution is forced into the wood surface under pressure. This process creates a more durable and water-resistant wood that is excellent for outdoor construction projects.
| Treated Wood | Pressure Treated Wood |
|---|---|
| Water-based solution | Vacuum chamber solution under pressure |
| Resistance against decay, termites, and rotting | Durable and water-resistant |
| Individual board can be replaced if damaged | Difficult to replace individual boards |
Both types of wood can be used for outdoor construction and have their own unique benefits. It’s important to understand the differences between the two types of wood and choose the one that best suits your specific project needs.
What is the difference between treated wood and pressure-treated wood?
Q: What is treated wood?
A: Treated wood is timber that has been impregnated with chemical preservatives to protect it against fungal decay and insect attacks.
Q: What is pressure-treated wood?
A: Pressure-treated wood is similar to treated wood in that it has been treated with chemical preservatives. However, what makes it different is that it has undergone a process where the preservatives have been forced into the wood fibers at high pressure.
Q: How is pressure-treated wood made?
A: Pressure-treated wood is made through a process where the wood is placed in a large cylinder and sealed. The cylinder is then filled with a preservative solution and the pressure is increased to force the solution into the wood fibers.
Q: Is pressure-treated wood better than treated wood?
A: It depends on the intended use of the wood. Pressure-treated wood is generally considered to be more durable and long-lasting, making it ideal for outdoor projects, such as decks and fences. Treated wood, on the other hand, may be more suitable for interior use or projects that do not require as much durability.
Q: Are there any safety concerns with pressure-treated wood?
A: There have been some concerns raised about the safety of certain types of pressure-treated wood, as they may contain harmful chemicals, such as arsenic and chromium. However, most pressure-treated wood sold today is considered safe for use in outdoor projects as long as proper precautions are taken.
Closing Thoughts
Now you know the difference between treated wood and pressure-treated wood. Whether you are building a deck, a fence, or any other outdoor structure, understanding the advantages and disadvantages of each type of wood can make a big difference in the success of your project. Thanks for reading and be sure to visit us again for more helpful articles.