Heat a viscous bituminous binder to make it fluid then in a plant mix it with heated. If the roof sheathing is protected on the interior by a layer of vapor impermeable cut and cobble foam then the moisture in the attic air is decoupled from the roof sheathing. Furthermore leaky ducts can lose as much as 20 of conditioned air flow to the attic bsc 2009. 
				
			
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