370 Piercy Rd.
San Jose, CA 95138
Contractor's License #969772
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How does EnerG Shield High performance Reflective Insulation work?
EnerG Shield High performance Reflective Insulation is unlike mass insulation which only slows down or resists heat transfer. EnerG Shield 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 EnerG Shield High performance Reflective Insulation.
What is the “R” Value of EnerG Shield High performance Reflective Insulation?
The “R” value depends on the number and size of the airspaces surrounding the EnerG Shield High performance Reflective Insulation and on the direction of the heat flow. Since EnerG Shield High performance Reflective Insulation 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.
How does EnerG Shield High performance Reflective 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 EnerG Shield High performance Reflective Insulation holds heat in the house. Another analogy would be that EnerG Shield High performance Reflective Insulation in the winter works just like a space blanket, which, although very thin and lightweight, holds your body heat in. A thin space blanket can keep you warmer than several heavy blankets.
OKAY, EnerG Shield High performance Reflective Insulation keeps heat in in the winter, how can it keep heat out in the summer?
Just like a space suit, EnerG Shield High performance Reflective Insulation 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 EnerG Shield High performance Reflective Insulation 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 EnerG Shield High performance Reflective Insulation collects dust over a period of time? Will it still work?
This very issue has been studied by research institutes. Most attics don’t accumulate enough dust to affect EnerG Shield High performance Reflective Insulation’s ability to save energy costs. Thousands of homes and structures have had EnerG Shield High performance Reflective Insulation installed for as long as ten years or more with no significant accumulation.
Won't my roof get hotter when I have EnerG Shield High performance Reflective Insulation in my attic?
No. EnerG Shield High performance Reflective Insulation 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 Reflective Insulation in?
No. EnerG Shield High performance Reflective Insulation actually makes your present insulation more effective.
Where do you install EnerG Shield High performance Reflective Insulation?
EnerG Shield High performance Reflective Insulation 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 EnerG Shield High performance Reflective Insulation?
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 EnerG Shield High performance Reflective Insulation?
Regardless of how much insulation you have in your attic, adding EnerG Shield High performance Reflective Insulation 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. Your EnerG Shield High performance Reflective Insulation dealer has been trained to evaluate your home or business and advise you of your savings potential.
Has EnerG Shield High performance Reflective Insulation been tested by a qualified independent laboratory or government agency?
The Florida Solar Energy Center at Cape Canaveral has 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 product hurt its effectiveness over a period of time?
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 if my home is already well insulated?
"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.
If we have failed to answer your question, please contact us so that we can add your question to this page.
I have insulation, but why is it still so uncomfortable?
Typical insulation only slows heat transfer, it doesn't stop it. So heat is slowed during the day, trapped in the insulation and is then released into your home during the night. There are several
solutions to this problem and combined can provide you maximum comfort.
High Performance Reflective Insulation and High Performance Window Film reflect heat instead of just slowing it down. These barriers are typically used in the attic or on windows. When appropriate, the Reflective Insulation Coatings can even be sprayed on similar to paint.
Since heat rises, and most attic insulation is installed just above the living space but not at the top of the attic, heat is trapped in the attic. A solar powered attic fan not only can remove that trapped heat from your home but do it with no energy cost since it is solar powered.
There are a lot of companies and a lot of options around energy conservation, how can I make the right choice to reduce my total energy bill?
There are so many areas in your home or business that either waste energy or can be used for energy production, a holistic approach is critical. The most important first step is to get a comprehensive energy audit that looks everywhere including attics, windows, doors, walls, lighting, heating and air conditioning.
Using a company that can analyze your energy situation and then can provide a full array of solutions such as solar cells, window film, reflective insulation, cellulose insulation, hydrogen energy cells and weatherization will have a dramatic impact on the project. A one stop shop for home energy conservation and production is not only easier but also less expensive and more effective.
[The] availability of credible, whole house contractors remains limited. Most contractors do not train in holistic building science, rather they specialize in a single construction procedure (e.g., HVAC or windows). The contractor market is highly fragmented … making it difficult for homeowners to identify which contractors perform relatively well compared to others and have the capabilities to complete the full retrofit.
Unlocking Energy Efficiency in the U. S. Economy, McKinsey & Company, July 2009
You wouldn't take your car to one mechanic for a diagnosis and then other individual shops for an oil change, brake work, etc.?
Energy conservation is so expensive initially even if it saves money. How can I reduce the up-front cost?
EnerG Shield has several programs that can substantially decrease the cost of the initial investment while still saving you money and making you more comfortable.
I own a business can you help with my building?
Absolutely, we have products that are specific to business buildings including retrofit solutions for apartments, offices and industrial sites.