Yakisugi is an ancient Japanese technique of surface charring wood to naturally protect it from moisture, mold, insects, and weather – without the use of harsh chemicals. The surface layer becomes carbonized but not fully burnt, making the wood more durable and visually expressive. Though rooted in Japan, this method fit beautifully into my project of building a treehouse for children – nestled in the heart of the Lika region.

With the help of my family, we burned and treated the beams ourselves, which will soon become the treehouse’s structure. The process was intuitive, physically demanding, yet incredibly rewarding. It involved lightly charring the wooden planks with a gas torch, brushing away the loose soot, and finishing with a natural oil produced locally. This final step enhanced the texture of the wood and created a protective layer that handles moisture and rain exceptionally well.

Why yakisugi?

In addition to extending the lifespan of the wood and contributing to sustainability, the technique also delivers a strong aesthetic effect—dark, almost velvet-like surfaces with pronounced grain patterns. In combination with the surrounding environment—forest, soil, and trees—the final result doesn’t feel like an artificial addition, but rather an extension of nature itself.

I’m grateful we had the chance to try this method on our own. Beyond the protection and knowledge gained, we were left with an unforgettable experience—connecting with nature through fire, scent, and hands-on work.

If you’re looking for an authentic, sustainable, and visually striking way to protect wooden elements—yakisugi is something I wholeheartedly recommend.