After we installed lp techshield radiant barrier there was a noticeable difference in the attic space and the upper rooms of the house. Put simply emissivity is the action of not converting energy into heat. These images came from a presentation danny parker gave pdf on fsec s cool roof research the third graph shows attic temperatures from the middle of the attic for several different types of roofing as well as a sealed attic. 
				
			
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