Although both wooden and steel moulds can be used to construct the Xbloc formwork, steel moulds are preferred as they can be used repetitively to produce large numbers of armour units. Various mould designs, consisting of 2 sections, are applied. The moulds are either vertically or horizontally assembled. Pouring and compaction of concrete is done simultaneously. An appropriate formwork design is facilitating the stripping of the moulds at an early stage and prevents to large extent from honey combing, surface bubbles and striking damages.