The MB-59S system is intended for realisations requiring thermal and acoustic insulation of the exterior building elements, such as: various types of windows, doors, vestibules, display windows, etc. The structural depth of the window sections is equal to 50 mm for frames and 59 mm for casements. The external surfaces of these sections lie in one surface. The structural depth of the door sections both for frames and the leafs is equal to 50 mm. This enables achieving the effect of facing the leaves with frames both from the external and the internal side.