Vaults of this kind are the result of placing moulds which later, once they have been filled, will serve to give shape to the concrete which is to be left exposed. In some cases the shuttering is used many times and in others only once, according to the characteristics of the vaults. In the second case one type of mould or another will be applied according to the forms that have to be made and, therefore, it will be composed of the most suitable material in terms of workability (wood, iron, plaster...).
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