The invention relates to an assembly for the placement of concrete, said assembly including a screed guide/control joint (100) having a linear shape and comprising a base member (102) and two walls (118, 120) extending upwardly from the base member and joined at an apex, forming a generally triangular-shaped longitudinal cavity (134). The screed guide/control joint also comprises an extension member (126), vertically extending upwards from the apex; and the assembly also comprises a longitudinal cap member (130) able to be removably fitted onto said extension member, so as to provide a removable height extension to the screed guide/control joint.
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