IS HeatBloc ULTRA PERMEABLE TO WATER?
Yes! HeatBloc allows water vapor to permeate, and does not trap water vapor within roof decks or sidewalls. This is vitally important in attic conditions. DO RADIANT HEAT BARRIERS LOWER HEATING COSTS? While they are most effective at lowering cooling costs, studies performed by the University of Kansas have showed a 15% reduction in heat loss through the attic when radiant barriers are used. WHAT IS THE COVERAGE RATE FOR HeatBloc ULTRA ? Recommended coverage for HeatBloc is 325 – 500 square feet per gallon depending on the porosity of the substrate. CAN HeatBloc ULTRA BE USED ON SIDEWALLS? Yes, but HeatBloc is normally more effective when used under roofs. Roof surfaces are generally much hotter than sidewalls. Up to 80% of the summer heat gain is from above. Low e surfaces become more effective in controlling radiant heat transfer as the temperature of the radiant heat source increases. However, in tropical climates where no insulation is used in sidewalls, HeatBloc can substantially
