The R-value of insulation is a measurement of how much heat resistance the material has per inch of depth, so even if the insulation R-value for one material is lower than it is for another ...

Building insulation materials are often evaluated by its R-value, a measure of thermal resistance. However, R-value does not account for the quality of construction of a building, or local ...

Rooflight performance varies with pitch, which affects the U-value. For instance, Stella rooflights achieve a U-value of 1.5 ...

By installing a layer of foam insulation on or inside any surface, it creates a thermal envelope thanks to their relatively high R-value, which is the material's thermal resistance to heat flow.