dampgjennomgang

Dampgjennomgang is a Norwegian term that translates to "vapor transmission" or "vapor permeance" in English. It refers to the rate at which water vapor can pass through a material. This property is crucial in building construction and design, particularly in relation to controlling moisture within structures.

Different building materials have varying degrees of vapor transmission. For example, materials like concrete and certain types of insulation have low vapor transmission rates, meaning they are relatively impermeable to moisture. Other materials, such as wood or some types of vapor barriers, can allow for a higher rate of vapor transmission. Understanding these rates is essential for preventing condensation, mold growth, and structural damage caused by excessive moisture.

In building science, vapor transmission is often considered alongside air leakage. Both can contribute to moisture problems. The concept is used to design effective building envelopes that manage indoor humidity levels and protect the building from external weather conditions. Building codes and best practices often specify requirements for vapor transmission rates based on climate zone and the specific application within a building.