Why is Pressure-Treated Wood Cheaper Than Untreated Wood?

Wood, in its many forms, is a staple in construction, crafting, and many other industries. Among the various types available, pressure-treated and untreated wood are two categories often discussed. This article aims to delve into the specifics of these two types of wood, focusing on their characteristics, how they’re produced, and, most importantly, why pressure-treated wood tends to be cheaper than untreated wood. So, let’s embark on this enlightening journey into the world of wood.

What is Pressure-Treated Wood?

As the name implies, pressure-treated wood undergoes a special treatment process to enhance its durability. This process involves infusing the wood with chemicals under high pressure; hence the term “pressure-treated”. The chemicals used are specifically designed to make the wood resistant to rot and insect infestation, two common issues that can significantly reduce the lifespan of wood.

The treatment begins with the wood being placed in a large cylindrical tank. The tank is then sealed and filled with the chemical solution. Once the tank is filled, pressure is applied, forcing the chemicals deep into the core of the wood. This infusion process ensures that every fiber of the wood is protected, providing a level of durability that untreated wood can’t match.

What is Untreated Wood?

Untreated wood, on the other hand, is wood in its most natural state. It doesn’t undergo any chemical treatments to enhance its durability. Instead, it’s typically air-dried or kiln-dried after being cut to remove excess moisture. This type of wood retains its natural beauty and texture, making it a popular choice for projects where aesthetics are a priority.

Untreated wood is commonly used in interior applications, such as furniture making, where the wood is less likely to be exposed to harsh weather conditions or insects. However, untreated wood requires more maintenance and care than its pressure-treated counterpart. It’s susceptible to rot, insects, and other forms of damage if not properly cared for.

Why is Pressure-Treated Wood Cheaper than Untreated Wood?

Regarding the cost of wood, one might naturally assume that untreated wood, being less processed, would be cheaper than its pressure-treated counterpart. However, this isn’t always the case. The price tag on wood isn’t just about the treatment it undergoes but a combination of factors, including the type of wood, its durability, and market dynamics. Let’s explore why pressure-treated wood often comes with a smaller price tag.

Type of Wood

Pressure-treated wood is typically made from less expensive yet abundant wood species like pine. These species are fast-growing, making them readily available and cost-effective. Untreated wood, on the other hand, can come from various species, including more expensive hardwoods. The type of wood used plays a significant role in determining the product’s final cost.

Durability and Maintenance

Pressure-treated wood boasts enhanced durability due to the chemical treatment it undergoes. This treatment makes it resistant to rot and insect damage, two common issues that can significantly shorten the lifespan of wood. On the other hand, untreated wood, while beautiful in its natural state, is more susceptible to these issues and may require more frequent replacement or repair. Pressure-treated wood’s longevity and lower maintenance needs can offset its initial costs, making it a more economical choice in the long run.

Supply and Demand

Market dynamics of supply and demand also play a crucial role in the cost of wood. Pressure-treated wood is popular for outdoor construction projects like decks and fences, leading to high demand. This high demand, coupled with efficient production methods, allows for large quantities of pressure-treated wood to be produced at a lower cost. When supply can meet demand in such a way, it often results in lower prices for the consumer.

Dangers and Disadvantages of Pressure-Treated Wood

While pressure-treated wood offers many advantages, it’s important to consider its potential drawbacks. The same chemical treatment enhancing its durability can also pose risks and disadvantages.

One of the primary concerns with pressure-treated wood is the potential health hazards associated with the chemicals used in its treatment. These chemicals are designed to resist rot and insects but can also harm humans and pets if ingested or inhaled. This is particularly a concern during the cutting or sanding, which can release these chemicals into the air.

Pressure-treated wood can also pose environmental concerns. Over time, the chemicals used in the treatment can leach out, especially when the wood is exposed to rain or moisture. This can potentially contaminate the surrounding soil and groundwater.

Another disadvantage of pressure-treated wood is its tendency to warp or crack over time. While this is a common issue with many types of wood, the pressure treatment process can sometimes exacerbate these issues, especially if the wood wasn’t properly dried before treatment.

Treated vs Untreated Wood for Decks

When it comes to building a deck, both pressure-treated and untreated wood have their own sets of pros and cons.

Pressure-treated wood is often the go-to choice for decks due to its resistance to rot and insects, which are crucial for outdoor structures. Its lower cost and availability in various dimensions also make it a practical choice. However, as mentioned earlier, pressure-treated wood can warp or crack over time, and requires regular maintenance to keep it in good condition.

Untreated wood, particularly when you opt for naturally durable species like cedar or redwood, can also be a great choice for decks. These types of wood are naturally resistant to rot and insects, and offer a beautiful, natural look that many homeowners prefer. However, untreated wood can be more expensive and require more maintenance to prevent weathering and decay.

When to Use Untreated Wood Instead of Treated Wood

While pressure-treated wood is a popular choice for many outdoor applications due to its durability and resistance to rot and insects, there are situations where untreated wood may be the better option.

One such scenario is in gardening, particularly when building raised garden beds. The chemicals used in pressure-treated wood can leach into the soil, posing a risk to plants and the overall ecosystem of your garden. Untreated wood, being free of these chemicals, is a safer choice for applications that come into direct contact with soil and plants.

Another situation where untreated wood shines is when aesthetics are a priority. Untreated wood retains its natural beauty and texture, making it a popular choice for projects where the look and feel of the wood are important. This can include furniture making, interior design projects, or any application where the natural grain and color of the wood are desired features.

Pressure-Treated Wood vs Pine

When comparing pressure-treated wood and pine, it’s important to note that pine is often the type of wood that is pressure treated. However, for the sake of comparison, let’s consider untreated pine and pressure-treated wood.

Untreated pine is a softwood that is inexpensive and easy to work with. It has a beautiful grain and color, making it a popular choice for indoor projects and furniture. However, untreated pine is not naturally resistant to rot and insects, making it less suitable for outdoor applications without additional treatment or maintenance.

Pressure-treated wood, often made from pine or similar species, undergoes a chemical treatment process that enhances its resistance to rot and insects, making it a more durable option for outdoor applications like decks and fences. While it may not have the same natural beauty as untreated pine, its durability and lower maintenance needs often make it a more cost-effective choice for outdoor projects.

Pressure-treated wood is often cheaper than untreated pine, particularly when considering the potential maintenance or replacement costs associated with using untreated wood outdoors. However, the final decision should always consider your project’s requirements, including aesthetics, durability, and budget.

Environmental Impact of Pressure-Treated Wood

The use of pressure-treated wood carries certain environmental implications that are important to consider. The primary concern lies in the chemicals used in the treatment process. While effective in protecting wood from rot and insects, these chemicals can potentially harm the environment.

Over time, these chemicals can leach out of the wood, especially when it’s exposed to moisture or decomposes. This can lead to soil and groundwater contamination. Moreover, the disposal of pressure-treated wood requires special care. It should not be burned in open fires or residential stoves, as this can release toxic chemicals into the air.

However, it’s worth noting that the wood treatment industry has made significant strides in reducing the environmental impact of its products. For instance, arsenic, a highly toxic chemical once common in wood treatment, has been phased out in many countries.

Maintenance of Pressure-Treated and Untreated Wood

Both pressure-treated and untreated wood require proper maintenance to ensure their longevity, although the specifics may vary.

While resistant to rot and insects, pressure-treated wood still requires regular care. This includes cleaning with a mild detergent and water to remove dirt and mildew. Despite its treatment, pressure-treated wood can still be susceptible to weathering and UV damage. To protect against this, applying a water-repellent sealant is recommended annually.

Untreated wood, on the other hand, requires more intensive maintenance. It should be regularly checked for signs of rot or insect damage, particularly if used outdoors. Applying a protective finish, such as paint or a clear sealant, to protect untreated wood from these issues can be beneficial. This enhances the wood’s appearance and protects against moisture and UV rays.

Regardless of the type of wood, regular maintenance is key to keeping your wood looking its best and ensuring it lasts for years. Always remember, a little care goes a long way!

Practical Examples: Using Pressure-Treated and Untreated Wood for Projects

Let’s consider a couple of hypothetical projects to illustrate the practical use of pressure-treated and untreated wood.

Project 1: Outdoor Deck

For an outdoor deck project, pressure-treated wood would be an excellent choice. Given its resistance to rot and insects, it can withstand the outdoor elements, providing a durable and long-lasting structure. The deck, once completed, stands up to rain, sun, and insects, requiring minimal maintenance apart from regular cleaning and annual sealing.

Project 2: Indoor Furniture

Untreated wood would be the go-to option for an indoor furniture project, such as a dining table or bookshelf. The natural beauty and texture of untreated wood, such as oak or maple, add a touch of elegance and warmth to the furniture. With regular care, including dusting and occasional polishing, the furniture retains its charm and serves its purpose for years.


Is treated wood safe?

Pressure-treated wood is safe for many applications, including decks, fences, and other outdoor structures. However, due to the chemicals used in the treatment process, it’s not recommended for use in applications where it will come into direct contact with food or the skin for extended periods. It’s also important to take precautions when cutting or sanding pressure-treated wood to avoid inhaling or ingesting the dust.

Can untreated wood be used outdoors?

Untreated wood can be used outdoors, but it’s generally less durable than treated wood when exposed to the elements. Untreated wood is more susceptible to rot, insects, and weather damage. However, certain types of wood, like cedar and redwood, resist these issues and can be used outdoors with regular maintenance.

How long does pressure-treated wood last?

With proper care and maintenance, pressure-treated wood can last 20 years or more, making it a durable choice for outdoor structures like decks and fences.

Can untreated wood be painted or stained?

Yes, untreated wood can be painted or stained. Applying a coat of paint or stain can provide a layer of protection against moisture and UV damage, extending the lifespan of the wood.


The choice between pressure-treated and untreated wood is crucial, influenced by cost, durability, aesthetics, and environmental impact.

Pressure-treated wood, with its enhanced durability and resistance to rot and insects, is a cost-effective choice for outdoor projects like decks and fences. However, it’s important to be mindful of the potential health and environmental implications of the chemicals used in its treatment.

On the other hand, untreated wood, in its natural and unaltered state, offers a unique aesthetic appeal that’s hard to replicate. While it may require more maintenance and isn’t as resistant to the elements as treated wood, it’s a popular choice for indoor projects and situations where the natural beauty of the wood is a priority.