Adversely, U-value measures the rate of heat transfer. R-value is essentially a product’s resistance to heat flow which means that the higher the product’s R-value, the better it is at insulating the home and improving energy efficiency. Knowing what R-value and U-values mean is key to following energy issues and to selecting products that best suit the climate zone you are building in. PDF,DOC and PPT Free Download for Construction and Architecture Engineering Students. Seminar Topics for Civil Engineering Students. Amazon Currency Converter Let Us Help You. Traditionally a building material of hot climate zones in Asia and Latin.