Bradford Gold Hi-Performance insulation are specifically designed and manufactured to deliver optimal performance the roofs of commercial and residential buildings. The climate zone which the building is in, is definitely one of the most important factors to determine the R-Value is required. R-Value, also referred to as R-Rating, is a measurement of the thermal resistance of the insulation – the higher the R-rating, the higher the resistance of the insulation to the transfer of heat. Or in other words, the higher the R-Value, the stronger the performance of the insulation.