Expo 2025 Osaka, set to take place on the artificial island of Yumeshima, will feature its most iconic landmark — the Grand Roof. In 2024, this groundbreaking project was officially recognized by the Guinness World Records as the largest wooden structure in the world.
Contents :
1.The Grand Roof
2.A Circle of Connection and Coexistence
3.Where Technology Meets Tradition
4.The Future Value of Wood
The Grand Roof
The circular design stretches over 2 kilometers in length with a total area exceeding 60,000 square meters. Functioning as both a shaded canopy and elevated walkway, the structure not only impresses with its scale and engineering but also symbolizes the Expo’s theme of “Unity in Diversity.”
A Circle of Connection and Coexistence
Led by Japanese architect Sou Fujimoto, the Grand Roof embraces the exhibition pavilions with a continuous ring-shaped pathway, creating a symbolic gateway to the world. Inspired by the Zen concept of the ensō (circle), the design conveys that even in uncertain times, the world can come together, connect, and shape a better future.The lower level provides shaded walkways and circulation routes for visitors, while the upper deck — an 8-meter-wide elevated promenade — allows people to stroll above the site, enjoy panoramic views of the Expo grounds, Osaka Bay, and even the Kobe skyline. It embodies the idea that architecture itself becomes part of the landscape.
Where Technology Meets Tradition
Built with sustainability at its core, the Grand Roof uses approximately 27,000 cubic meters of laminated timber, including about 6,600 cubic meters supplied by WOODCORE in Namie, Fukushima. The timber, made primarily from cedar, cypress, and larch, has undergone strict radiation monitoring to ensure safety. Beyond structural use, it also represents Fukushima’s forest industry revival following the 2011 earthquake and nuclear disaster.
The construction applies the traditional Japanese “kanawatsugi” beam-penetration method, often seen in shrines, combined with modern metal fasteners to enhance earthquake resistance — a perfect blend of heritage and innovation.
The Future Value of Wood
Through the Grand Roof, we see the potential of wood as a primary material for large-scale public buildings. It also highlights how local forestry and sustainable materials can bring new value to cities, industries, and the environment.
At bestwood, we have long promoted the use of diverse timber products and offer a wide range of engineered wood and heavy timber solutions — including glulam beams, structural timber, and outdoor landscape wood. We welcome architects, designers, and builders to connect with us and explore how timber can shape the future of sustainable construction.
Together, let us build a greener future with the timeless strength of natural wood.
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