Japan's 1,400-Year-Old Kigumi Joinery Keeps Ancient Temples Standing Without Nails

Japanese craftsmen continue to restore centuries-old temples using kigumi, a traditional woodworking technique that joins timber without any metal fasteners. The method relies on precisely carved wooden interlocks designed to flex and absorb stress, making structures resilient against earthquakes and high humidity. Skilled artisans called miyadaiku have preserved and transmitted this craft across generations for over 1,400 years. Beyond structural durability, the approach is considered environmentally sustainable as it significantly reduces construction waste. The continued use of kigumi helps safeguard Japan's historic architectural heritage while avoiding reliance on modern materials.