Abstract: There is provided a form of assembled elements for pouring concrete, the form consisting primarily of elements made of synthetic materials. These elements include a molding face of elastomer, a rear face having grooves, an envelope filler of rigid foam, and edges having a reinforced lip and attachment points for assembly means. The form includes a reinforcing framework made of metallic profile members. It is maintained in place by a support scaffold of triangular trellis construction. The elements have a size and weight which permits them to be handled by a single person.