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How often have you heard such a categorical statement from an insulation salesman or contractor who knows his craft? Hearing those words, a cold sweat covers you and a shiver runs through your body, because what could be more important than "breathing" for a person? At that moment, all other advantages of insulation take a back seat. A troubling thought appears in your mind: "What if I run out of air in my house—what could be worse? It's so scary! Oh God, and I almost bought it..."
Over the past five years, the pace of development in building material technologies has gradually increased, and especially in thermal insulation design, the issue of wall vapor permeability and the importance of this factor in the room’s microclimate has been heavily emphasized. It has reached the point where the vapor permeability of thermally insulated walls is considered almost the primary parameter that characterizes the thermal insulation structure, pushing into the background the main reason for the existence of the thermal insulation layer—namely, resistance to the penetration of external temperatures, the so-called thermal protection.
By analyzing existing publications on the topic of "healthy wall breathing," we can conclude that the positioning of insulation products based on this principle is simply a marketing strategy that has nothing to do with reality. Debunking this myth must happen sooner or later! Let’s examine how water diffusion occurs through walls and what effect it has on the room’s microclimate.
The physical principles of this process are as follows: In the atmosphere inside and outside the building, there is a difference in partial pressure. If this difference is positive, due to the diffusion of water through the wall, moisture moves from the room to the outside. If the difference is negative, some of the water will diffuse from the outside into the room.
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