1)   Raise efficiency of ventilation, additionally heat the rooms, exclude humidifying sources, and clear air vent.

2)   Clear the places covered with a black mould by spittle. Treat with a vitriol solution (100g of vitriol on 1litre of water) and dry up. (Or treat the damaged place with a formalin solution: 0,25litres of 40% formalin on 10litres of water). After full drying-out the surface anew plaster and bleach with a fresh slaked lime.

3)   Improve the thermal protection of external walls. For this purpose, external walls from inside cover by thermal insulation materials as a fiberboard, a polystyrene complex, a formaldehyde polyfoam. Polyfoam is glued on the cleared wall, for example, with cement-latex solution (3 parts of latex, 1 part of cement). Seams between slabs paste over with a gauze by means of latex and plaster. The good result is given by a sheet work of walls by gypsum cardboard. In this case, the space (~ 4cm) between a wall and gypsum cardboard is filled with mineral cotton.  

4)   Restore tightness of seams of slabs (panels of wall) of external walls from outside: seams fill with cement slurry or front putty for exterior works. Glue from above with a tape (for example, a net roller) by means of saturn red or other weatherproof paint.

Close up outside clearance spaces between window sashes and a wall, especially in the bottom part (for this purpose it is possible to use joint sealants or fitting foams). 

5)   Improve the ventilation of communication mines. Regularly check of integrity of water pipes and the water drain (it is not recommended to sheathe the communication pipes in a dwelling unit). Provide dryness in basements.

6)   Cover by a waterproofing material the ceilings and walls of utility cores and kitchen (by tile and where it is possible by plastic material. The bath ceiling should be well heat-insulated.)