The article is devoted to particularly important contemporary problems, namely
usage of energy-saving and ecological materials in load-bearing structures of buildings.
This issue is discussed in the paper in respect of floor slabs. We propose to
combine traditional materials (concrete and steel reinforcement) with energy-
-efficient material (non-autoclaved foamed concrete) in floor slabs structure. It is
assumed that employment of precast-monolithic reinforced concrete floor slab with
usage of non-autoclaved foamed concrete can afford to decrease dead weight of floor
and foundation loading, and to guarantee good thermal and acoustic insulation
between storeys.