Kosteuspysähdys

Kosteuspysähdys refers to a phenomenon in building physics where moisture accumulates within a building's structure. This occurs when water vapor, typically from indoor air or external sources, encounters a surface within the building envelope that is colder than its dew point temperature. As the moist air cools, its capacity to hold water decreases, leading to condensation.

The most common locations for kosteuspysähdys are in poorly insulated areas, around thermal bridges, or within ventilation systems. Thermal bridges are parts of the building structure that have a higher thermal conductivity than surrounding materials, such as structural elements or window frames, which can lead to colder internal surfaces.

The consequences of kosteuspysähdys can be significant. Accumulated moisture can degrade building materials, leading to rot in timber elements, corrosion of metal components, and damage to insulation. Furthermore, damp conditions create an ideal environment for mold and mildew growth, which can pose health risks to occupants through poor indoor air quality.

Preventing kosteuspysähdys involves careful design and construction practices. This includes ensuring adequate insulation levels, minimizing thermal bridges, and implementing effective vapor control layers. Proper ventilation is also crucial to manage indoor humidity levels and remove moist air before it can condense. Understanding the principles of heat and moisture transfer is key to avoiding this detrimental building defect.