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Yakisugi (, ) is a traditional, very old Japanese method of wood preservation. It is also referred to as , a term which uses the same kanji characters, but Kunyomi. The ban character means "plank". In the West it is known as burnt timber cladding. This old technique has several similarities with the modern thermal wood modification (2025). 9783030813147, Springer International Publishing. ISBN 9783030813147 methods used in Europe and elsewhere.
By slightly charring the surface of the wood without combusting the whole piece, the surface becomes water-resistant through the carbonization and at the same time its hygroscopy is decreased due to chemical cell-changing process during carbonization, which results in increased durability. It additionally protects the wood against insects, fungi and mold, as well as making the wood a rather fire-resistant material. However, some studies have shown that a mere charring of the surface does not improve durability or fire resistance. It also doesn't make the wood waterproof.
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