what is K-factor, R-value and U-factor?

 K-factor represents the thermal conductivity of a material, measuring its ability to conduct the heat. The lower the K-value, the better the product is at insulating the envelope. 

 R-value measures a product’s thermal resistance to heat flow through a single material, like a single metal panel. Because R-value measures resistance to heat flow, the higher the R-value, the better the material is at insulating the building. 

 U-factor measures a product’s thermal transmittance of heat flow through a building envelope assembly, like an IMP system. Because U-value measures the transmittance of heat, the lower the U-value, the better the total system is at insulating the building.