dauerfeuchte

Dauerfeuchte (permanent dampness) is a term used in building physics, construction practice and materials science to describe a condition in which a material or space remains damp over an extended period, as opposed to transient or seasonal moisture changes. It results from ongoing moisture input or retention, such as groundwater ingress, rising damp, leaks, insufficient insulation, condensation due to temperature differences or high external humidity, and poor ventilation.

In buildings, Dauerfeuchte leads to sustained elevated humidity levels within components and persistent surface dampness. This can cause an increase in moisture content of susceptible materials like wood, plaster, gypsum, organic insulation and textiles, and may compromise structural integrity or indoor air quality. Prolonged damp conditions favor deterioration processes such as mold growth, rot of timber, corrosion of metals, and degradation of construction materials, with potential health risks for occupants.

Assessment relies on measurements of relative humidity, moisture content of materials, dew point, and moisture-activity indicators for specific materials. Standards commonly distinguish Dauerfeuchte from Wechselfeuchte (temporary or cyclic moisture loads) and emphasize moisture control as part of building design and renovation.

Prevention and mitigation focus on removing moisture sources and pathways, improving drainage and waterproofing, enhancing envelope airtightness, and ensuring effective ventilation and moisture management. This may include optimizing thermal insulation to reduce condensation, installing appropriate vapor barriers, and implementing monitoring with hygrometers, moisture meters, or infrared imaging to enable early detection.

The concept applies across disciplines, including construction, renovation, archaeology and materials testing, wherever long-term dampness affects performance, durability, and indoor environmental quality.