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. Structural arches replace beams to sustain rooftops. Click to enlarge
. When they are repetitive they are made with a wooden shape, adjustable by two wooden wedges. The mason lays the first row of rubble stones on this shape. Click to enlarge

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A closed arch is blocked. When the mortar is dry, the mason moves up the qooden shapes to use them to build other arches. Click to enlarge
. Row of structural arches. Click to enlarge
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