FIELD: building, particularly construction of floor structures for low-story public and civil buildings. SUBSTANCE: floor slab includes upper and lower reinforced concrete layers and heat insulation layer located in-between. The layers are integrated into rigid box-like frame by counter ribs and discrete vertical connectors. Vertical connectors are made of heavy-weight concrete and formed by orifices created in heat insulation layer. The orifices are equidistant one from another in longitudinal and transverse directions. EFFECT: increased floor rigidity, simplified manufacturing technique. 4 dwg
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