Made with Xara Be Green.  Save Money. Radiant Barrier Reflective Attic Foil Insulation How does Radiant Barrier Reflective Foil Bubble Insulation work? Radiant Barrier is unlike mass insulation, which only slows down or resists heat transfer. Radiant Barrier reflects heat. Heat always moves towards cold by natural law—the problem is how to keep the heat in during the winter and how to keep it out during 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.  The surface of radiant barrier reflects this radiant heat. How much will I save on my energy bill with Radiant Barrier Reflective Foil Bubble Insulation? Radiant Barriers are expected to save approximately 3-10% on annual utility bills, and even up to 17% in some cases.  The savings will be greater if there is ductwork in the attic.  This savings varies by geographic location and insulation type installed. The Department of Energy has a calculator that can be used to estimate savings based on your unique situation (every house is different!).  Click this link and follow the instructions - Department of Energy Radiant Barrier Calculator. What is the difference between Radiant Barrier Attic Insulation and Reflective Foil Bubble Insulation? Both materials contain the same metallized aluminum layers and can be used as radiant barriers or reflective insulation.  The main difference is that the radiant barrier foil bubble insulation material has a layer of air bubbles between the aluminum layers.  This acts as an insulator (similar to conventional fiberglass insulation).  The radiant bubble product will have greater strength and structure and can be used for over 40 different types of applications.  The radiant barrier is primarily used in home attics and is a single foil layer without bubbles.  The radiant barrier is also perforated which is vital to let water vapor move across the product in an attic application. What is the “R” Value of Radiant Barrier Reflective Foil Bubble Insulation? The “R” value depends on the number and size of the airspaces surrounding the Radiant Barrier and on the direction of the heat flow. Since Radiant Barrier is usually installed on top of existing mass insulation, its R-value is a moot point. It is Radiant Barrier’s ability to reflect heat that makes it such an energy saver.  R-value is the measure on how much an object slows heat transfer.  Radiant barrier doesn’t slow heat transfer, it blocks heat transfer.  What if there is no air space present? If there is no air space on either side of the Radiant Barrier, there will be NO reflective benefit.  The air space is crucial to Radiant Barrier’s performance.  An air space of at least 1/4” (3/4” is ideal) is recommended on the side reflecting the heat. How does Radiant Barrier Reflective Foil Bubble Insulation keep me warmer in the winter? Just like wrapping a baked potato in aluminum foil keeps a potato warm longer by holding the heat in, covering your attic insulation with Radiant Barrier holds heat in the house. Another analogy would be that Radiant Barrier in the winter works just like a space blanket, which, although very thin and lightweight, holds your body heat in. How can Radiant Barrier Reflective Foil Bubble Insulation keep heat out in the summer? Just like a space suit, Radiant Barrier reflects the sun’s heat before it can warm up the insulation in your attic. When the insulation stays cooler, your house will stay cooler. It helps to understand how Radiant Barrier will work for you if you think of other things that work in much the same way. ASTRONAUTS’ SPACE SUITS—keep body heat and reflect the sun’s heat away. THERMOS BOTTLES—keep hot things hot and cold things cold. They are almost perfect insulators. The tight seal and air space prohibit heat transfer by conduction and convection. The reflective surfaces inhibit radiation heat transfer. If the bottle starts out hot, it stays hot because very little heat is transferred to the cooler outside. If it starts out cold, it stays cold because very little heat is transferred from the warmer outside. What if Radiant Barrier Reflective Foil Bubble Insulation collects dust over a period of time? This very issue has been studied by research institutes. Most attics don’t accumulate enough dust to affect Radiant Barrier’s ability to save energy costs. Thousands of homes and structures have had Radiant Barrier installed for as long as ten years or more with no significant accumulation. Won’t my roof get hotter when I have Radiant Barrier Reflective Foil Bubble Insulation in my attic? No. Radiant Barrier has been used extensively in the south, showing no difference in roof temperatures, as confirmed by field tests. Do I have to take out my old insulation to put Radiant Barrier Reflective Foil Bubble Insulation in? No. Radiant Barrier actually makes your present insulation more effective. Where do you install Radiant Barrier Reflective Foil Bubble Insulation? Radiant Barrier can be laid over your present insulation like a blanket or stapled under your rafters or crawl space. What about foil-faced fiberglass? Isn’t it just as good as Radiant Barrier? No. The foil on the fiberglass is in direct contact with the attic floor. Aluminum foil becomes more conductive when in contact with a solid surface. The air space facing the reflective surface is of primary importance. I already have plenty of insulation in my attic. Do I really need Radiant Barrier? Regardless of how much insulation you have in your attic, adding Radiant Barrier will save on your heating and cooling expense, and keep you much more comfortable. Energy savings for heating and cooling can be as much as 17%, depending on a number of factors, including climate, building configuration, materials used, site, family size and lifestyle. Has Radiant Barrier been tested by a qualified independent laboratory or government agency? Both the Oak Ridge National Laboratory in Tennessee and the Florida Solar Energy Center at Cape Canaveral have tested radiant barriers in both small scale laboratory and full scale building models. Their results indicate that radiant barriers provide significant resistance to heat transfer. Current tests conducted by the Tennessee Valley Authority and the University of Mississippi support the findings of the Florida Solar Energy Center. Northeastern Illinois University conducted winter tests in residential and commercial structures using infra-red thermograph photography. The photos showed significant resistance to heat transfer over the regular insulation. Will dust collecting on the top of the Reflective Foil Bubble Insulation hurt its effectiveness? A1 “Aluminum foil exposed in a vertical position since 1929 to the dust and fumes in the Heat Measurements Laboratory, M.I.T. Samples of this foil have been removed from time to time and the emissivity determined. Over a period of 10 years no appreciable change in emissivity was found.” American Society of Heating and Air Conditioning Engineers’ Journal Section, Jan. 1940, Professor Wilkes, M.I.T. A2 “Thin layers of dust readily visible to the eye do not cause very serious lowering in the reflective power. The appearance of the surface is not a reliable guide as to its reflectivity for radiant heat, and foil which appears dark or discolored may have lost little in insulating value if the surface film is thin.” -The National Bureau of Standards, U.S. Dept. of Commerce, Letter Circular - 535. Will the aluminum corrode and lose its effectiveness? A1 “Hundreds of samples of aluminum foil have been stored in the laboratory for various periods of time up to 10 years with no visible signs of deterioration.” American Society of Heating & Air Conditioning Engineers’ Journal Section  A2 “Aluminum is highly resistant to the effect of corrosion… Aluminum is constantly being used where it is exposed to weather, salt spray and other conditions, which would adversely affect most metals.” The United States Rubber Co. Booklet, Serving You Through Science, Page 5. Do I need a radiant barrier Reflective Foil Bubble Insulation if my home is already well insulated? A1 SUMMER: “A radiant barrier system can stop 97 percent of the thermal radiation across an attic space. If it is not stopped, that radiant energy would be absorbed by the ceiling insulation and eventually be transferred to the living space below.” The Solar Collector, Quarterly Newsletter of the Florida Solar Energy Center. “The heat storage capacity of reflective insulation is low. As a result, it does not store heat during summer days, only to pass it on down into the rooms of the house from the attic at night when coolness is most apt to be desired from the point of view of sleeping comfort.” Progressive Architecture, Nov. 1949, Page 76. A2 WINTER: “CONCLUSIONS: Reflective foil retrofitted to fiberglass insulated…buildings is demonstrably effective in reducing heat loss… Installation of foil in uninsulated buildings would show even more pronounced reduction in heat loss.” Effects Of Reflective Foil On Heat Loss in Attic Floors and Metal Building Installations, Northeastern Illinois University, Prof. Charles Shabica, May 20, 1986. 1. How does Radiant Barrier Reflective Foil Bubble Insulation work? 2. How much will I save on my energy bill with Radiant Barrier Reflective Foil Bubble Insulation? 3. What is the difference between Radiant Barrier Attic Foil and Reflective Foil Bubble Insulation? 4. What is the “R” Value of Radiant Barrier Reflective Foil Bubble Insulation? 5. What if there is no air space present? 6. How does Radiant Barrier Reflective Foil Bubble Insulation keep me warmer in the winter? 7. How can Radiant Barrier Reflective Foil Bubble Insulation keep heat out in the summer? 8. What if Radiant Barrier Reflective Foil Bubble Insulation collects dust over a period of time? 9. Will my roof get hotter when I have Radiant Barrier Reflective Foil Bubble Insulation in my attic? 10. Do I have to take out my old insulation to put Radiant Barrier Reflective Foil Bubble Insulation in? 11. Where do you install Radiant Barrier Reflective Foil Bubble Insulation? 12. What about foil-faced fiberglass? Isn’t it just as good as Radiant Barrier ? 13. I already have plenty of insulation in my attic. Do I really need Radiant Barrier? 14. Has Radiant Barrier been tested by a qualified independent laboratory or government agency? 15. Will dust collecting on the top of the product hurt its effectiveness over a period of time? 16. Will the aluminum corrode and lose its effectiveness? 17. Do I need a Radiant Rarrier Reflective Foil Bubble Insulation if my home is already well insulated? Frequently Asked Questions
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