Why Do Even Impregnated Decking Boards Need Protection with Natural Decking Oil?

When building a terrace, impregnated boards are often chosen with the assumption that they are already well-protected against moisture, UV rays, and biological threats. However, this belief is not entirely accurate. To ensure maximum durability and aesthetics, even impregnated wood boards should be treated with a suitable natural decking oil.

🌿 Impregnation may not be enough

Impregnation (usually with salt solutions using pressure or vacuum methods) helps protect the wood against insects, mold, and fungi, but it cannot provide:

  • Protection against UV rays, which fade the wood and break down lignin – a key structural component of wood.
  • Moisture regulation – impregnated wood still absorbs and releases water vapor, which can eventually cause cracking and warping.
  • Visual protection – impregnated wood can quickly turn gray if not properly protected from weather conditions.

🔬 Impact of outdoor conditions

Wood is a hygroscopic material – it absorbs and releases moisture from its surroundings. This cycle, intensified by sun and rain, leads to cracking, surface splintering, and the development of mold.

UV rays degrade lignin, making the surface of the wood brittle and gray. This process occurs even on impregnated wood, as impregnation typically does not protect against sun exposure.

🌱 Why choose natural decking oil?

Natural decking oil – such as OLI-NATURA Decking Oil – provides:

  • Deep penetration into the wood, balancing moisture and preventing cracking.
  • UV protection with the help of natural pigments and UV filters.
  • Breathability of the wood surface, unlike synthetic coatings that clog the pores.
  • Safety for people and the environment, as it contains no harmful substances and is safe for children and pets.

Ūdens piles uz eļļota terases dēļa

🛠 How to properly treat impregnated boards with oil?

  1. Wait 4–8 weeks after installing the impregnated boards to allow excess moisture and chemicals to evaporate.
  2. Clean the surface thoroughly from dirt and dust.
  3. Apply the natural decking oil using a brush or cloth, let it absorb, and wipe off any excess after 20 minutes.
  4. Reapply oil once per season, especially in areas exposed to sun and rain.

✅ Conclusion

Whether you use impregnated or untreated decking boards, natural decking oil is an essential layer of protection. It helps preserve the wood’s structure and natural color while extending the life of your terrace for many years.

👉 Take a look at our OLI-NATURA Decking Oil – a premium-quality natural oil that offers outstanding protection against outdoor elements. If it can protect yacht decks, it can

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