It consists of a monolithic slab with a two-row brick base, brick width and wooden walls. Airways in the brick is not, the height of the basement turns out about 14 cm, the question arises, how to arrange floors on this slab? Wood you probably can not put, there are no vents – will suffocate, what can you advise?
If there is sand under the slab, put insulation on top – EPS. And on top of the slab – better with a warm floor.
Do not forget the insulation on the inside walls of the basement.