#Japan #Osaka #Guinness World Record #Taiyo Kogyo #Sunbud Sauna

A Historic Moment: The Tallest Membrane Sauna

In a significant announcement that has thrilled sauna enthusiasts and innovation advocates alike, the 'Sunbud' sauna, a collaborative project by Taiyo Kogyo Co., Ltd., has been officially recognized by Guinness World Records™. The accolade for being the tallest membrane-structure sauna building was awarded on October 8, 2025, during a ceremony attended by various dignitaries and representatives of the Expo event.

The 'Sunbud' sauna, strategically positioned within the Future Life Zone of the Osaka-Kansai Expo, showcases a remarkable structural design utilizing advanced membrane technology honed by Taiyo Kogyo over the years. Rising to an impressive height of 8.4 meters, this sauna not only magnifies the beauty of modern architecture but also encapsulates the essence of natural energy and well-being. The sauna's exterior is wrapped in a specialized ETFE (ethylene tetrafluoroethylene) film, allowing abundant natural light to filter through while providing the benefits of high durability and insulation.

A Sauna Unlike Any Other

What sets the 'Sunbud' sauna apart extends beyond its impressive dimensions. Designed to create a holistic experience, the sauna invites guests to engage with their surroundings and forge connections with nature, humanity, and the planet itself. According to Yuuki Nomura, president of Taiyo Kogyo, the sauna embodies the concept of 'Earth Resonance,' which aims to foster a sense of unity among individuals and their environment. Nomura expresses pride in this achievement, highlighting that the efforts of his team culminated in a notable success on the international stage.

Innovative Design and Technology

One of the defining features of the sauna is its tetrahedral shape, which maximizes the internal air volume using minimal structural components. This not only contributes to the building's lightweight construction but also enhances insulation, aligning with contemporary standards for energy efficiency. The incorporation of ETFE film, which is only 0.25 mm thick yet durable for over two decades, positions it as a revolutionary material that rivals traditional glass in construction.

The sauna building includes various facilities, including a management office, relaxation lounges, and a water bath area, all designed with care to create a serene atmosphere. The architectural ingenuity of the sauna has caught the attention of visitors and experts alike, contributing to its recognition as a landmark within the Expo.

Celebrating the Achievement

The official certificate presentation was a moment of pride not just for Taiyo Kogyo, but also for the broader community involved in the Expo. Participants included Jun Takashina, Vice Secretary-General of the 2025 World Expo Association, event producer Kenji Kobayashi, and notable figures in design and sauna production. This gathering not only celebrated an architectural marvel but also cemented the commitment to innovative experiences at the Expo.

With an eye towards the future, Nomura revealed that plans are underway to relocate the 'Sunbud' sauna post-Expo to allow an even broader audience to enjoy its unique offerings. This endeavor reflects Taiyo Kogyo's commitment to exploring new ideas and aesthetics in sauna experiences, aiming to contribute to a kinder and more connected world.

In light of this record-setting achievement, the 'Sunbud' sauna stands as a testament to the potential for architecture to enhance well-being and communal experiences.

Conclusion

As visitors flock to the Expo, the 'Sunbud' sauna serves as both an innovative piece of engineering and a space for reflection and relaxation. With its Guinness World Record standing, this sauna not only demonstrates Taiyo Kogyo's technical prowess but also invites guests to experience a deeper connection with themselves and the world around them. Visitors are anticipated to leave not just refreshed but also inspired by the possibilities that lie ahead in the fusion of technology and human experience.