Natural Beauty of Untreated Thermo Ayous

Untreated Thermo Ayous starts with a golden-brown tone that gradually weathers to a silvery grey when exposed to sunlight and rain.

• Ideal for those who prefer a natural, weathered aesthetic.
• Still offers strong dimensional stability due to the thermal modification process.
• However, without treatment, it becomes more susceptible to surface checking and faster colour change.

If you love the greyed look, it’s best to let it weather evenly. Consistent exposure to light and rain helps maintain a uniform finish.

Benefits of Treating Thermo Ayous

When treated with a high-quality oil like Osmo UV Protection Oil 420, the surface gains several long-term benefits:

• UV protection that slows greying and colour fading.
• Water repellence that reduces moisture absorption and surface cracking.
• Enhanced grain depth and richer tone that highlights the Ayous’ natural beauty.
• Easier future maintenance, as the oil nourishes the wood rather than forming a film.

Durability and Maintenance Comparison

Which Option Is Right for You?

It depends on your project’s look and location.

• Modern designs often prefer the oiled finish for a warm, rich tone.
• Coastal or exposed areas benefit more from UV protection and water resistance.
• Minimalist weathered looks may choose to leave it untreated intentionally.

Both options have their place, but if you want to preserve that beautiful golden tone and protect your investment from UV and moisture, treating your Thermo Ayous with Osmo 420 UV Protection Oil is a smart choice. You can watch our recent video of Thermo Ayous being treated here, or explore our full range of Thermo Ayous cladding options here.