The requirements of the indoor climate and comfort have become more stringent during the recent years. The insulation constitutes an important factor of this, as it ensures obtaining that the correct temperature is obtained.
The most common way of expressing thermal properties is by using the following nomenclature:
- Coefficient of the Thermal Transmission (U-value)
- Thermal Resistance (R)
It is important to note that the λ-value for any given material varies with temperature specification of the λ-value should therefor be referred to as "mean" temperature and, if possible, to a standardised method for measuerement and calculation.