The aesthetic function of masonry cladding, must be conceived and designed without aggravating the deterioration of the building, since the primary factor of building deterioration is moisture. This means that it must hinder the entry of weather and promote the exit of water vapor.

Künzel's theory is used in the field of building physics and in particular to evaluate the performance of materials in terms of their resistance to vapor diffusion. It states that a façade building material will not suffer damage over time if its ability to yield water, by the diffusion process, is greater than its ability to absorb water by capillary action.

The SD value is an important parameter in construction for measuring the resistance of a material to the passage of water vapor. It is calculated by multiplying the vapor migration by the thickness of the material expressed in meters.

Example on the panel Nobilium Thermalpanel heart of the dehumidifying coating Dwall:

 The SD value is calculated using the formula:

SD=μ ×d

Where:

- μ is the vapor diffusion resistance coefficient of the material.

- d is the thickness of the material in meters.

Thermal insulation Nobilium Thermalpanel

- μ is 3

- d is 9 mm = 0.009 m

Applying these values in the formula:

SD=3×0.009

Let us proceed with the calculation:

SD=0.027 Thus, the value of the material is 0.027 meters.

New plaster, including dehumidifying plaster, is not sufficient to completely dry out damp walls. In construction, the breathability of a material refers to its ability to be traversed by moist air. Breathability is generally related to the porosity of the material: the greater the breathability, the less likely it is that condensation will form on the surface of the material. In addition, good breathability contributes to better thermal insulation, since dry air in stagnant conditions is an excellent thermal insulator.

Using Künzel's theory, the value of a plaster and equal SD of the material is 0.03 meters.

From this we can evidently understand that the SD value of Nobilium Thermalpanel and 11% faster in disposing moisture and keeping the finishing package intact.

Water vapor can change the behavior of the insulation, increasing the thermal conductivity value and, therefore, increasing energy losses and the risk of condensation. The thermal conductivity of water is 0.56 W/mK, a significantly high value compared to that of Nobilium Thermalpanel 0.032 W/mK.

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