Buildings constructed with VST technology have high air tightness. The cement-bonded particle boards from which VST products are made have a heat-insulating effect compared to concrete. This allows for significant space and cost savings to be achieved in insulation. In principle, any type of insulation can be used in conjunction with VST products. VST walls (without insulation) have the following thermal resistance:
|Overall wall thickness||[m²K/W]||[W/mK]|
24 mm cement bonded particle boards have a thermal conductivity coefficient of 0,26 W/mK and a R value of 0,092 m²K/W.
To calculate the U-value, an exterior wall is assumed – and 0.04 + 0.13 = 0.17 m²K/W (according to DIN EN ISO 6946) is assumed as the rated values of the heat transfer resistances.