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This roof is standing with no steel beams or concrete support 🧱😱 You’re watching a Catalan vault, also called a timbrel vault. It’s a traditional masonry technique that’s hundreds of years old. The builder lays thin bricks and mortar in layers, creating a curved roof that supports itself. No steel reinforcement. No wooden formwork underneath. The arch shape redirects all the weight into compression forces along the curve. Each brick locks the others in place. The structure gets stronger as mor