Hinoki wood, also known as Japanese Cypress, is one of the most valued and revered types of wood in Japan. Its scientific name is Chamaecyparis obtusa, and it belongs to the cypress family (Cupressaceae). In Japanese, Hinoki is written as 檜 or 桧, symbolizing its deep connection to Japan’s spiritual and architectural heritage. Hinoki is not merely a construction material; it is a symbol of purity, reverence, and the enduring essence of nature in Japanese spiritual life [1].
Hinoki possesses outstanding biological and physical characteristics, making it a top choice for warm and humid environments like bathrooms, saunas, or traditional Japanese wooden bathtubs (ofuro).
Naturally Antibacterial & Mold-Resistant
Hinoki contains hinokitiol and phytoncide – compounds with antibacterial, antifungal, and insect-repellent properties, requiring no chemical treatment. This ensures optimal hygiene in humid, high-temperature environments like saunas, where other types of wood might deteriorate [2], [3].
Heat-Resistant & Thermally Insulating
Hinoki retains its shape and structure under high heat without warping or cracking. Additionally, it absorbs and releases heat slowly, so the surface remains safe to touch – a critical safety feature in sauna design [1].
Natural Aroma with Health Benefits
Hinoki’s light, citrus-like aroma helps calm the nervous system, reduce heart rate and blood pressure, and elevate mood. Studies show that essential oils from Hinoki enhance parasympathetic nervous system activity – providing deep relaxation within minutes of exposure [3].
Elegant and Meditative Aesthetics
With its creamy yellow to ivory white hue, fine grain, and straight fibers, Hinoki lends a refined, bright, and clean feel to any space. In sauna settings, it creates a luxurious, meditative atmosphere closely connected to nature [2].
Hinoki’s history is closely tied to Japan’s most iconic structures. The Hōryū-ji temple – one of the oldest wooden buildings in the world – and the Ise Grand Shrine – a sacred site in Shintoism – were both built primarily using Hinoki. Historically, Hinoki has been considered a “sacred wood,” used in religious structures, palaces, public baths (onsen), and traditional bathtubs (ofuro).
Today, many modern Japanese architects continue to incorporate Hinoki into sauna and spa designs. For example, the handcrafted sauna project in Keihoku (Kyoto) by Studio 2M26 uses Hinoki alongside traditional carpentry techniques to create a natural and minimalist sauna experience [1].
Due to its rarity and the strict harvesting controls, companies like Hinoki Soken in Gifu Prefecture now supply products made from Kiso-Hinoki – a premium grade of Hinoki that is carefully selected by hand to preserve traditional Japanese woodworking quality and culture [3].
Benefits
Antibacterial and Moisture-Resistant → Ensures a hygienic sauna environment, prevents odors and mold.
Safe for Skin Contact → Does not overheat, non-allergenic, ideal for direct contact.
Natural Fragrance → Promotes deep relaxation, improves breathing, and reduces anxiety.
High Aesthetic Value → Bright color, beautiful grain, perfect for spas and meditative spaces.
Durable When Properly Maintained → Long lifespan; retains scent and structure for decades.
Drawbacks
High Cost: As a premium imported wood from Japan, Hinoki is significantly more expensive than common types of wood.
Limited Supply: Mostly sourced from strictly managed plantations in Japan, and often subject to counterfeiting.
Requires Careful Maintenance: Needs regular cleaning and protection from standing moisture or prolonged sun exposure.
Not Suitable for Outdoor Use Without UV Treatment: Prolonged exposure to sunlight and harsh weather may cause fading and scent loss.
Sources:
[1] R. Rowell, Wood and Cellulosic Chemistry, 2nd ed. Boca Raton, FL: CRC Press, 2005. [Online]. Available:
https://books.google.com.vn/books?hl=vi&lr=&id=KRHGj8fm9psC&oi=fnd&pg=PA6&dq=hinoki+for+sauna+room&ots=VbU1mOLuMa&sig=A73xiSBwCFBtoB82cYXiJNpWN80&redir_esc=y#v=onepage&q=hinoki%20for%20sauna%20room&f=true
[2] Hinoki Soken, "Hinoki Wood Materials." [Online]. Available: https://www.hinokisoken.jp/en/material.html. [Accessed: Aug. 1, 2025].
[3] Irasshai Store, "Hinoki Wood & Japanese Wellness Products," Irasshai Store, 2022. [Online]. Available: https://irasshai.store/blogs/news/hinoki-wood-japanese-products. [Accessed: Aug. 1, 2025].
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Members is a precious type of wood native to Japan, known for its light color, fine grain, and pleasant natural aroma. Thanks to its antibacterial, moisture-resistant, and heat-resistant properties, Hinoki has long been used in traditional architecture, such as temples, onsen bathtubs, and especially saunas. With its calming fragrance and exceptional durability, Hinoki is increasingly favored in modern bathroom design, offering a luxurious and serene){kind=link}