Folding roof (architecture)

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A folding roof , rarely a folding roof , is a roof shape made up of usually four equally large, mostly irregular pairs of diamond halves on a building with a square or octagonal floor plan and four triangular gables (shield gables) as a wall end. The modified tent roof resembles a half-open umbrella.

The pairs of diamond halves that abut one another with their long sides have an interior angle ( valley ) on the edge facing inwards towards the roof structure and create four longitudinally "folded" diamonds. A pair of diamond halves consists of two mutually mirror-inverted , obtuse-angled triangles , the upper tip angle (roof tip) of which is usually smaller than the lower one. If the point angles are equal, there are regular pairs of diamond halves or "folded diamonds". The four “folding diamonds”, offset by 45 ° compared to the four gables , butt against each other , like the flat “regular” diamonds on the rhombic roof , with their upper tips and the adjacent eight outer sides and thus form the roof tip (in European churches usually with a dome, weather valve , Roof cross or flagpole finally) and the four roof ridges (roof edges) that run from the top of the roof to the four respective gable tips. The four lower "folding diamond" peaks lie on the four corners of the wall between two over-corner gables (eaves), the eight lower outer diamond sides on the eight gable sides.

As with the rhombic roofs, the main application was the tower helmets of mostly sacred buildings. They were made of a wooden beam construction covered with slate , in rare cases made of stone. There were also folding roofs with six- and eight-sided geometry. In modern buildings there are folding roofs made of reinforced concrete .