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Radiant Barrier


Radiant Barrier: 

Attic Radiant BarrierA reflective radiant barrier is used in attics primarily to reduce summer heat gain and reduce cooling costs. The barrier consists of a highly reflective material that reflects radiant heat rather than absorbing it.
Radiant barriers are more effective in hot climates than in cool climates, especially when cooling air ducts are located in the attic. A good barrier can reduce cooling costs 5% to 10% when used in a warm, sunny climate and as we all know, heating and cooling contribute the most to your electric bill!

Attic Insulation: Is it time to upgrade your attic insulation? Properly insulating your attic is essential to reducing energy bills. A well-insulated attic helps keep temperatures inside the home stable as exterior temperature fluctuates throughout the day and the year.

How does radiant barrier work?

Radiant barrier is unlike mass insulation which only slows down or resists heat transfer. Radiant barrier reflects heat. Heat always goes cold by natural law—the problem is how to keep the heat in in the winter and how to keep it out in the summer. There are three ways in which heat goes from warm spaces to cold spaces: conduction is direct heat flow through a solid object such as a wall or a ceiling. Convection is heat movement through air, occurring when air is warmed. The warm expands, becoming less dense and rising. Radiation is the movement of heat rays across air spaces from one warm object to a cooler object. The heat we feel from a wood stove or a quartz space heater is radiant heat. All objects and bodies give off radiant heat. Even the insulation in your attic gives off radiant heat to the cold attic space in the winter, and to the living space in the summer. Regular insulation won’t stop radiant heat loss. Radiant heat must be reflected with a radiant barrier.

Attic insulation

Will prevent heat transfer via conduction (R-Value), will be applied to fully fill attic cavities (preventing heat loss via convection), and will be densely packed (preventing heat loss via air infiltration and radiation). “Blown-in” Cellulose insulation meets all four of these critical performance criteria!

Attic InsulationDensely packed cellulose limits air movement and prevents drafts much better than fiberglass insulation. This is well documented by the University of Colorado in their 1990 evaluation of identical homes insulated with fiberglass and cellulose. The results of their study showed cellulose reduced air leakage by 38% and required 26% less money to heat and cool than the fiberglass home.

aND Attic insulation