Schlagregendichte

Schlagregendichte refers to the resistance of a building material or construction assembly to the penetration of wind-driven rain. It is a critical performance indicator for building envelopes, particularly in regions prone to heavy rainfall and strong winds. The concept is directly related to water permeability under dynamic pressure conditions.

In practical terms, a high Schlagregendichte means that a material or assembly is less likely to allow water to pass through it when subjected to the combined forces of wind and rain. This is essential for preventing water damage to interior finishes, structural components, and insulation, which can lead to issues like mold growth, rot, and reduced thermal performance.

Testing for Schlagregendichte typically involves simulating wind-driven rain on a sample under controlled laboratory conditions. Various standards and testing methods exist, often specifying different levels of wind pressure and water application rates. A common testing procedure involves spraying water onto a test specimen while simultaneously applying a differential air pressure across it, mimicking the effects of a storm.

Materials and construction details with good Schlagregendichte are crucial for maintaining the durability and longevity of buildings. This includes considerations for facade elements such as cladding, windows, doors, and roofing. Proper detailing and installation are as important as the inherent properties of the materials themselves in achieving effective resistance to wind-driven rain.