Absence of Problem of Condensate Formation on the Inner Surface of Wallswith Fastened Heat Insulation
Possibilities to define an everyday expression “breathing walls” from the point of view of air-permeability and resistance to vaporpermeability are considered. Itis noted that enclosing structures that fall under these definitions do not meet the requirements of SNiP “Heat protection of buildings”. The types of methods forcalculation of humidity conditions are described. Calculations of non-stationary humidity conditions of multi-layer structures with the use of main types of efficientheat insulating materials (mineral wool, formed foam polystyrene, extruded foam polystyrene) in different cities of Russia arepresented. It is demonstrated thatthe humidity on the inner surface of the wall, when mineral wool and extruded foam polystyrene are used as a heat insulators, does not exceed 1%, when formedfoam polystyrene is used - 2%. This work debunks the existing opinion that when some types of efficient heat insulator are used “the walls are not breathing”and the condensate can form on the inner surface. It is shown that this does not happen even in the period of the greatest moisture accumulation in any climaticzone of construction.