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 preserve the natural structure and longevity of the wood, a high-quality decking oil is essential. However, decking oils vary significantly in composition and their impact on both wood and the surrounding environment.
In this article, we will analyze the differences between synthetic and natural decking oils, the chemical compounds that affect wood durability, and why natural oils provide better long-term protection.
How do decking oils work?
To prevent moisture absorption, cracking, and biological degradation, a durable protective layer is needed. Decking 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, allowing it to breathe, providing long-lasting elasticity and natural protection.
✔ Synthetic oils – often create a thin protective film on the surface that 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 decking oils often contain mineral oils and solvents such as petroleum distillates, which evaporate over time and pollute the environment. They may also contain chemical preservatives that can cause allergic reactions.
In contrast, natural decking oils consist of a blend of plant-based oils (tung oil, linseed oil, etc.), orange terpenes, natural resins, and waxes, which are fully biodegradable and environmentally friendly.
Thanks to their small molecular size, plant oils deeply penetrate the wood structure, helping to reduce moisture absorption and improve natural protection, while natural resins form a flexible protective layer that strengthens the wood surface.
2. Impact on Wood Structure
Natural oils penetrate the wood, making it hydrophobic while still breathable, meaning:
🔹 Moisture has a harder time entering the wood, while water vapor can escape freely, preventing swelling and cracking.
🔹 No sanding is required for reapplication, as the oil does not leave a film on the surface.
🔹 The wood retains its natural appearance without an "artificial gloss" or "plastic effect."
In contrast, synthetic oils often create a thin surface layer that can crack and peel, allowing moisture to accumulate and accelerating wood deterioration.
3. Protection Against Fungi, Mold, and UV Radiation
The biological degradation of wood is primarily caused by:
❌ Microorganisms and mold – thrive in humid environments, damaging wood structure.
❌ UV radiation – destroys lignin, making wood brittle and gray.
To avoid these issues, decking oil must protect wood from both moisture and sunlight. Natural oils containing plant resins and natural UV filters (pigments) provide effective long-term protection.
Some oil manufacturers add chemical fungicides, which can be toxic and cause allergic reactions. A natural alternative is plant-based resins and terpenes, which naturally repel mold and fungi without damaging the wood structure.
4. VOC Emissions and Air Quality Impact
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 irritation)
🚨 Increased fire hazards
Natural decking oils contain significantly fewer VOCs than synthetic alternatives, making them a safer choice for households and the environment.
AURO Decking Oil – The Power of Nature for Wood Protection
When choosing a decking oil, it is crucial to consider composition and long-term protection. AURO Decking Oil combines natural plant oils, resins, and orange terpenes, ensuring deep impregnation and long-lasting wood protection. It is available in three shades - Warm Brown (Teak), Mahogany Brown (Bangkirai), and Honey Gold (Larch).
✔ Free from synthetic chemicals – safe for the environment and humans
✔ Deeply penetrates the wood – prevents cracking and moisture absorption
✔ Protection against UV radiation and microorganisms without chemical fungicides
✔ Low VOC emissions – cleaner air and safer use