Decking Oil – How to Choose the Best Protection for Wooden Terraces in 2025

Wooden terraces are exposed to various external factors – moisture, UV radiation, temperature fluctuations, and biological damage. To maintain the natural structure and longevity of the wood, a high-quality terrace oil is necessary. However, oils can differ significantly in composition and their impact on both wood and the environment.

In this article, we will analyze the differences between synthetic and natural terrace oils, which chemical compounds affect wood longevity, and why natural oils provide better long-term protection.

How do terrace oils work?

To prevent moisture absorption, cracking, and biological degradation, a durable protective layer must be created. Terrace oil penetrates the wood fibers, impregnating them and forming a hydrophobic protective layer. However, not all oils work the same way – the differences lie in the composition:

  • Plant-based oils – deeply penetrate the wood, allow it to breathe, provide long-lasting flexibility, and natural protection.
  • Synthetic oils – often form a thin protective layer on the surface, which can crack and peel over time.

Modern terrace protection products combine natural plant oils with natural resins, ensuring long-term wood protection without synthetic additives.

Comparison of natural and synthetic terrace oils

1. Chemical composition and environmental impact

Synthetic terrace oils often contain mineral oils and solvents such as petroleum distillates, which evaporate over time and pollute the environment. They may contain chemical preservatives, biocides, and fungicides – toxic substances that can cause allergic reactions.

In contrast, natural terrace oils consist of a blend of plant oils (linseed oil, castor oil, etc.), natural resins, and waxes, which are fully biodegradable and environmentally friendly.

2. Impact on wood structure

Natural oils penetrate the wood, making it hydrophobic while still allowing it to breathe, meaning that:

  • Moisture has a harder time penetrating the wood, while water vapor can freely escape from the wood pores, preventing swelling and cracking.
  • No sanding is needed during reapplication since the oil does not leave a surface film.
  • The wood retains its natural appearance, without an "artificial shine" or "plastic effect."

On the other hand, synthetic oils often form a thin surface layer that can crack and peel, promoting moisture buildup and accelerating wood deterioration.

3. Protection against fungi, mold, and UV radiation

The biological degradation of wood is mainly caused by:

  • Microorganisms and mold – develop in a humid environment, damaging the wood structure.
  • UV radiation – destroys lignin, making wood brittle and gray.

To prevent this, terrace oil must protect the wood from both moisture and sun exposure. Natural oils containing plant resins and natural UV filters (pigments) provide effective long-term protection.

Some oil manufacturers add chemical fungicides, which can be highly toxic and cause allergic reactions. A natural alternative is plant-based resins, which naturally repel mold and fungi without damaging the wood structure.

4. VOC emissions and impact on air quality

Volatile organic compounds (VOCs) are hazardous to both human health and the environment. High VOC levels can cause:

  • Air pollution and unpleasant odors.
  • Health issues (allergies, respiratory inflammation).
  • Increased fire hazard.

Natural terrace oils typically contain significantly lower VOC levels than synthetic alternatives, making them a safer choice for both households and the environment.

OLI-NATURA Yacht & Teak Oil – the power of nature for wood protection

When choosing terrace oil, it is essential to consider composition and long-term protection. OLI-NATURA Yacht & Teak Oil combines natural plant oils and resins, ensuring deep impregnation and long-lasting wood protection:

  • Natural formula – contains no biocides, fungicides, synthetic resins, or preservatives.
  • Child-safe – meets DIN EN 71-3 (toy safety standard), safe for wooden surfaces that children come into contact with.
  • Deeply penetrates wood without clogging pores – allows the wood to "breathe," preventing cracking.
  • Protection against moisture and UV radiation – prevents mold and blue stain formation.
  • Does not peel or crack like synthetic coatings – long-lasting, natural effect.
Back to blog