Thermal insulation – k-factor

Thermal insulation – Please explain, which means the k-factor The k-value is an abbreviation of the heat transfer coefficient.
It means the amount of heat, yak within 1 s penetrates through 1 m2 of the building partition depending on its thickness, at the temperature difference between the inside and outside 1 K (1°C). The heat transfer coefficient from the inside and outside is also taken into account.
The smaller the value of the k-factor, the better is the thermal insulation of the partition. The greater the value of the k-factor, the greater the heat loss.

What is the difference between the heat transfer coefficient k and thermal insulation??
While the coefficient k determines the amount of heat loss, the thermal insulation coefficient is understood as the resistance to heat flow, Ie. resistance of the building partition to the flow of heat flux. Again, it is a partition with a surface 1 m2, specific thickness, at the temperature difference between the inside and outside of the partition equal 1 K (1°C).

What k-factor value is required for an exterior wall?
The smaller the value of the k-factor, the better is the thermal insulation of the partition. Is required, that the value of the k-factor is less than 1,39 W/(m2K). However, this value is far from optimal. A value for the k-factor below is recommended 0,40 W/(m2K).

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