The lower the material density is, the higher is the k-value.
The k-value of the samples is affected by the temperature at the mid-thickness of the insulation.
The change of the k-value can exhibit as much as 9.4% and 20% increase in k-value of the wall and roof.
The change in heat accumulated within the wall and roof are 4% and 14% compared with the heat based on k24.