Why use Pressure Treated Lumber

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Are you planning to build a deck but unsure about the best wood to use? Pressure-treated wood is a popular choice for outdoor structures due to its durability and resistance to deterioration.

This article will help you understand the pros and cons of using pressure-treated wood for your deck, enabling you to make an informed decision. Keep reading to discover if pressure-treated lumber is the right fit for your decking project!

Key Takeaways

  1. Pressure-treated wood is a popular and cost-effective choice for decks, offering durability and resistance against rot, decay, and insect infestation. It can last 15-20 years with proper maintenance and costs around $15-$20 per square foot, compared to $30 or more for composite decking.
  2. The chemical treatment process for pressure-treated wood involves infusing lumber with preservatives like alkaline copper quaternary (ACQ) and micronized copper azole (MCA) under high pressure, providing long-lasting protection against the elements and pests.
  3. While pressure-treated wood requires regular maintenance such as annual cleaning and sealing every few years, it offers versatility in design and can be customized with stains or paints to match desired aesthetics.

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What is Pressure Treated Wood?

Pressure treated wood is lumber that has been chemically treated to resist rot, decay, and insect infestation. This type of wood is commonly used for outdoor projects such as decks, fences, and playgrounds due to its enhanced durability and resistance to the elements.


Pressure-treated wood is lumber that has been infused with chemical preservatives to enhance its durability and resistance against decay, rot, and insect infestation. The treatment process involves forcing these preservatives deep into the wood under high pressure, ensuring thorough penetration and long-lasting protection.

Common preservatives used in pressure treatment include chromated copper arsenate (CCA), alkaline copper quaternary (ACQ), and micronized copper azole (MCA). While CCA-treated wood has been phased out for residential use due to arsenic concerns, ACQ and MCA-treated lumber are considered safer alternatives that still provide excellent protection against the elements and pests.

Pros of Pressure Treated Wood for Decks

wood deck outside house

Pressure treated wood is an excellent choice for decks due to its durability and resistance to rot, decay, and insect damage. It’s also a cost-effective option compared to other materials, making it a popular choice for homeowners on a budget.


Pressure treated wood decking offers superior durability compared to untreated lumber, making it an ideal choice for decks exposed to the elements. The chemical treatment process infuses the wood with preservatives, protecting it from rot, decay, and insect infestations, ensuring your deck remains structurally sound for years to come.

This increased durability translates to long-term cost savings, as you won’t need to replace your deck boards as frequently as you would with non-pressure-treated wood. Pressure-treated decking can withstand harsh weather conditions, moisture, and heavy foot traffic, providing a reliable and long-lasting foundation for your outdoor living space.


Pressure-treated wood is a cost-effective option for building a deck. The treatment process allows for the use of less expensive lumber species, such as pine or fir, which are more affordable than naturally rot-resistant hardwoods like cedar or redwood.

This cost savings can be significant, especially for larger decks or those with intricate designs. Homeowners can expect to pay around $15 to $20 per square foot for a pressure-treated wood deck, compared to $30 or more per square foot for composite decking materials.

In addition to the initial cost savings, pressure-treated wood decks also offer long-term value. The chemical treatment helps protect the wood from decay, insect infestation, and moisture damage, extending the lifespan of the deck.

With proper maintenance, including regular cleaning and sealing, a pressure-treated wood deck can last 15 to 20 years or more. This durability means homeowners can enjoy their deck for many years without the need for costly repairs or replacements, making it a smart investment for outdoor living spaces.


Pressure treated wood offers homeowners a versatile material for their decking projects. Its ability to withstand harsh weather conditions and resist decay makes it suitable for various deck designs and styles.

From traditional rectangular decks to multi-level or curved layouts, pressure treated lumber provides the flexibility to bring your dream outdoor space to life.

Moreover, pressure treated wood can be easily customized to match your desired aesthetic. Whether you prefer a natural wood look or want to apply a stain or paint, this type of lumber readily accepts a variety of finishes.

This versatility allows you to create a deck that seamlessly complements your home’s exterior and reflects your personal style.

Alternatives to Pressure Treated Wood

two men installing a deck

If you’re looking for alternatives to pressure treated wood for your deck, composite decking, PVC decking, and other natural wood options are worth exploring to find the best fit for your specific needs and preferences.

Composite decking

Composite decking, a popular alternative to pressure-treated wood, combines wood fibers and plastic to create a durable, low-maintenance option for outdoor spaces. This engineered material resists rot, insect damage, and moisture, making it an ideal choice for homeowners seeking a long-lasting decking solution without the need for frequent staining or sealing.

While composite decking may have a higher upfront cost compared to pressure-treated wood, its extended lifespan and minimal upkeep requirements can make it a cost-effective choice in the long run.

Available in a variety of colors and textures that mimic the appearance of natural wood, composite decking allows homeowners to achieve their desired aesthetic without the drawbacks associated with traditional lumber.

PVC decking

PVC decking is a popular alternative to pressure-treated wood for decks. Made from polyvinyl chloride (PVC), this synthetic material offers excellent durability and low maintenance requirements.

PVC decking resists moisture, insects, and rot, making it an ideal choice for areas with harsh weather conditions. It also comes in a variety of colors and textures, allowing homeowners to achieve the desired aesthetic for their outdoor living space.

One of the main advantages of PVC decking is its ease of maintenance. Unlike pressure-treated wood, which requires regular staining or sealing to maintain its appearance and protect it from the elements, PVC decking only needs occasional cleaning with soap and water to keep it looking fresh.

This low-maintenance feature makes PVC decking an attractive option for homeowners who want to spend more time enjoying their deck rather than maintaining it. However, it is important to note that PVC decking may be more expensive upfront compared to pressure-treated wood.

Other natural wood options

In addition to pressure-treated wood, composite decking, and PVC decking, there are several other natural wood options available for decks. Cedar, redwood, and tropical hardwoods like ipe and mahogany are popular choices due to their natural resistance to decay and insects.

These woods are often more expensive than pressure-treated lumber but offer a beautiful, rich appearance that can enhance the overall look of your outdoor living space. When selecting a natural wood for your deck, consider factors such as durability, maintenance requirements, and cost to ensure you choose the best option for your specific needs and budget.

How to Choose the Right Material for Your Deck

couple deciding what to pick

When choosing the right material for your deck, consider factors like your location, climate, and maintenance requirements. Your budget and personal preferences will also play a role in selecting the best option for your deck project.

Maintenance requirements

Maintaining your deck is crucial for its longevity and appearance, regardless of the material you choose. Pressure-treated wood requires regular maintenance to keep it looking its best and to prevent deterioration.

This includes cleaning the deck annually with a pressure washer or a specialized deck cleaner to remove dirt, grime, and algae. Applying a water-repellent sealer or stain every few years is also essential to protect the wood from moisture and sun damage.

It’s important to note that pressure-treated wood may require more frequent sealing than other materials due to its porous nature.

In contrast, composite and PVC decking require less maintenance than pressure-treated wood. These materials are designed to resist fading, staining, and moisture damage, making them a low-maintenance option for homeowners.

However, they still need to be cleaned occasionally to remove dirt and debris. Depending on the specific product, composite and PVC decking may also benefit from an occasional light sanding to remove any surface imperfections or scratches.

When comparing maintenance requirements, it’s essential to consider the time and effort you’re willing to invest in upkeep to ensure your deck remains in top condition for years to come.


When planning a deck, it’s crucial to consider your budget and choose materials accordingly. Pressure-treated wood is a cost-effective option compared to alternatives like composite or PVC decking, making it a popular choice for homeowners looking to build a deck without breaking the bank.

While the initial cost of pressure-treated lumber may be lower, it’s important to factor in the long-term maintenance costs, such as regular cleaning, staining, and sealing, to protect the wood from the elements and extend its lifespan.

Ultimately, the right material for your deck will depend on your specific budget and the trade-offs you’re willing to make between upfront costs and long-term maintenance. If you have a limited budget and don’t mind the additional upkeep, pressure-treated wood can be an excellent choice for your deck.

However, if you’re willing to invest more initially for a low-maintenance option, composite or PVC decking might be worth considering.

Personal preference

Personal preference plays a significant role when selecting the right material for your deck. Homeowners should consider their individual taste and desired aesthetic when making this decision.

Pressure-treated wood offers a classic, natural look that many find appealing, while composite and PVC decking come in a variety of colors and textures to suit different styles.

Ultimately, the choice between pressure-treated wood and alternative materials for your deck depends on your priorities and what you find most visually pleasing. Take the time to explore different options and visualize how each material would look in your outdoor space before making a final decision.

With careful consideration of your personal preference and the other factors mentioned, you’ll be well on your way to creating the perfect deck for your home.


Pressure-treated wood is an excellent choice for your deck, offering durability, cost-effectiveness, and resistance to the elements. While alternatives like composite and PVC decking have their merits, pressure-treated lumber remains a reliable and budget-friendly option for most homeowners.

Ultimately, the decision comes down to your specific needs, climate, and personal preferences, but rest assured that a pressure-treated wood deck can provide years of enjoyment and value to your outdoor living space.



1. What is pressure treated wood and why is it used for decking?

Pressure treated wood undergoes a special treatment process that infuses preservatives deep into the wood, making it resistant to rot, decay, and insect damage. This durability makes pressure treated wood an ideal choice for decking, especially in areas with high moisture or ground contact.

2. Can I use non-pressure treated wood for my deck?

While you can use untreated wood for your decking, it is not recommended. Non-pressure treated wood is more susceptible to moisture damage, rot, and insect infestations, which can significantly shorten the lifespan of your deck. Investing in pressure treated wood ensures a longer-lasting and more durable deck.

3. Is pressure treated wood safe for use in residential decks?

Yes, modern pressure treated wood is safe for use in residential decks. The wood treatment process now uses copper-based preservatives, which are EPA-approved and considered safe for both humans and the environment. However, it’s essential to follow proper handling and installation guidelines when working with pressure treated wood.

4. How long does a pressure treated deck typically last?

A well-maintained pressure treated deck can last up to 40 years or more, depending on factors such as the quality of the wood, the level of maintenance, and the environmental conditions. Regular cleaning, staining, and sealing can help extend the life of your pressure treated deck and keep it looking great for decades.

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