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What is pressure treated wood?

In this section, we explore everything you need to know about pressure treated decking. From the numerous advantages of using high-quality materials like Trex to essential maintenance tips for longevity, we’ll offer a comprehensive guide to help you make informed choices for your outdoor living area. Whether you're considering a new installation or looking to upgrade your existing space, understanding the benefits of composite decks will empower you to create the perfect outdoor retreat.

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So, what is pressure treated wood?

Pressure treated wood in Canada is commonly Spruce wood that has been treated with preservatives to protect it from rot, insects, and moisture. It's used in a variety of residential and commercial applications

How it's made 

  • Wood is placed in a cylinder and pressurized

  • A solution of water and preservatives is forced into the wood

  • The preservatives react with the wood fibers to slow decay

pressure treated deck

What are the pros of a pressure treated deck?

Key advantages of a pressure treated deck:

  • Durability:

    Due to the chemical treatment process, pressure treated wood is highly resistant to rot, fungal decay, and insect damage, ensuring a longer lifespan for your deck compared to untreated wood. 

  • Moisture resistance:

    The treatment helps repel water, making it suitable for outdoor use in areas with high humidity or frequent rain. 

  • Affordability:

    Pressure treated lumber is generally considered a cost-effective option for building a deck compared to some alternative materials. 

  • Versatility:

    A wide range of sizes and cuts are available to suit different deck designs and construction needs. 

  • Ease of use:

    Pressure treated wood is readily available at most lumber yards and is relatively easy to work with for DIY projects. 

Key points about the environmental benefits of a pressure treated deck:

  • Durability:

    The primary environmental benefit is its longevity, as the treatment protects the wood from rot and insects, meaning it lasts significantly longer than untreated wood, reducing the need to constantly replace the deck material. 

  • Reduced wood waste:

    By lasting longer, pressure treated wood generates less waste over its lifetime, minimizing the need to harvest new wood as frequently. 

  • Sustainable sourcing:

    When sourced from certified sustainable forestry practices, the wood used for pressure treating can contribute to the preservation of forests. 

old pressure treated deck boards.

Pressure-treated wood has several disadvantages, including environmental impact, chemical risks, and maintenance requirements

Now what about the disadvantages?

Environmental impact

  • The chemicals used to treat wood can harm the environment. 

  • Arsenic, a common chemical in treated wood, is poisonous and can cause severe illness or death. 

Chemical risks 

  • Pressure-treated wood can be hazardous if not handled correctly.

  • Inhaling dust from pressure-treated wood can be harmful.

Maintenance requirements

  • Pressure-treated wood requires regular maintenance, including staining, sealing, and pressure washing. 

  • The wood can crack, warp, and cup if not properly cared for. 

Other disadvantages

  • Fading: The wood can fade over time due to exposure to the sun. 

  • Splitting: Water can cause the wood to expand and contract, which can lead to splitting. 

  • Delamination: Layers of the wood can separate over time, which can lead to structural issues. 

  • Swelling: The wood can swell when exposed to moisture, which can lead to warping and other structural issues. 

  • Stick marks: Some treatment processes can leave marks on the wood's surface. 

Thats great, but how do I look after my pressure treated deck?

To maintain a pressure treated deck, regularly clean it with a deck cleaner and a soft-bristled brush, inspect for damage, and apply a thin coat of Osmo Decking Oil every year. Be sure to let your pressure treated lumber dry out for a season prior to application. Sand before first coat, then just a wash before reapplying annually. It really is that good!. Ensure you use a low pressure setting on a pressure washer when cleaning to avoid damaging the wood surface; always replace any damaged boards as needed.

 

Key steps for pressure treated deck maintenance:

  • Regular cleaning:

    Clean your deck at least once a year with a dedicated deck cleaner and a brush to remove dirt, debris, and mildew. 

  • Pressure washing:

    If using a pressure washer, use a low pressure setting to avoid damaging the wood. 

  • Inspection:

    Regularly check your deck for signs of rot, warping, loose boards, or other damage. 

  • Sealing or staining:

    Apply a water-repellent sealant or semi-transparent stain to protect the wood from weather damage and UV rays. 

  • Damaged board replacement:

    Replace any damaged or rotten deck boards promptly. 

  • Minimize water exposure:

       Ensure proper drainage and direct water away from the deck with gutters and downspouts. 

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