It describes the material CLT, which is used for the manufacture of floor slabs. The required floor thickness is calculated from the condition of rigidity under a load of 2.4 kN / m2 for various spans. The values of deflections are determined from the stiffness condition. The calculated deflection values are compared with the standard values. Based on these results, the recommended floor thickness is assigned for each span.

Keywords: cross-laminated timber, timber constructions, floor, deflection, rigidity