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The paper deals with the organization of the horizontal divide during the concreting of overlapping slab of the "Monofant" system. It is known that according to the Ukrainian State Building Codes (DBN) there should be no horizontal divide in flat developed in plan structures such as foundations or overlapping slabs. This investigation is aimed to approve that horizontal divide may take place in real construction conditions and according to the numerical studies there is no big difference between traditional “Monofant” slab and those one which have the divide discussed above. For this case, finite element models of overlapping slab with different variants of modeling of the divide with the help of flat and volumetric finite elements were constructed. The analysis of the proposed stuctures was performed by the method of comparison of the the overlapping slab of the "Monofant" system with and without divide in concreting. The slab with dimensions 6x6m and general thickness 200mm, which have lower and upper flanges with the thickness of 50mm is considered in numerical analysis. The middle part of the slab filled with insert void-former (for example, polystyrene). The width of monolithic ribs between inserts is 100mm. For all cases of the horizontal divide its thickness is adopted 10mm. In the first part of the investigation, a finite element models of the slabs made of flat finite elements with different modules of elasticity of the divide is considered. The presence of the divide leads to a slight increase in both the values of displacements and strain energy of the system, whereby, with the increase of the modulus of elasticity of the material of the divide, this difference in the values of the SSS components for two systems (with continuous and intermittent divide) is offset. In second part, the volumetric models of the traditional “Monofant” slab, a slab with continuous divide and a slab with shear bonds made of transverse reinforcement are considered. It should be