Building physics

Avoiding mold indoors or minimizing noise in apartment buildings: Building physics provides important clues as to how the construction elements must be designed in order to implement your building project ideally and, above all, safely. With the contents listed here, we would like to offer you information on the subject of building physics.

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The field of sound insulation includes room acoustics and building acoustics.

Room acoustics measures serve to reduce the reverberation time. The aim can be to improve speech intelligibility, for example in the case of electroacoustic announcements in rooms that fall under the regulations of the Directive on Places of Assembly, or to reduce the noise level in work rooms. The perforation of trapezoidal or cassette profiles allows sound to penetrate into the cavity behind them, where it is absorbed by mineral fiber absorbers or acoustic fleeces.

The term "building acoustics" describes the sound insulation properties of building components and buildings with regard to the transmission of airborne and structure-borne sound. In the case of the components for wall and roof structures considered here, only statements on airborne sound insulation are of interest. Depending on the insulation material, the sheet thickness, the construction and (in the case of perforated profiles) the proportion of perforated surfaces, weighted sound insulation values of up to more than 50 decibels are possible.

More detailed information on sound insulation or absorption capacity is provided, for example, in IFBS Guideline 4-06 "Building physics - sound insulation in lightweight steel construction" (


In a certain indoor climate with a corresponding indoor temperature ti and a different outdoor temperature ta, there is a risk of condensation forming on metal roofs and walls without thermal insulation or with insufficient thermal insulation. This applies in particular to single-shell constructions of water-bearing shells.

The cause of such condensate formation is due to the fact that the warmer interior air, which is enriched with more water, cools down on the colder metal, causing water vapor to precipitate as condensate on the cold surface on the room side.

By applying a condensate storage coating to the room side of the metal surface, the precipitating condensate is completely or partially bound. According to DIN 53923, up to 490 g/m² of condensate can be absorbed until saturation. With appropriate ventilation for the fleece coating, the absorbed water quantity is released back into the ambient air.