Reflective insulation
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Reflective insulation

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What is Reflective Insulation?
Reflective insulation is typically made up of aluminium and also well-known as a DIY radiant barrier. It appears like metallic foil and has a reflective covering. It is very handy and very easy to install.

In the use of reflective insulation, its primary purpose is to prohibit radiant heat from transmitting across open spaces. Reflective insulation decreases energy bills in the summer, particularly in the warmer climates. This can also be used in some cases to reduce heating costs.

Every type of insulation on the market comes with an R-value. The R-value is rated corresponding to a piece of insulation's thickness and density. The R-value of reflective insulation is calculated by how the heat flows in the home.

Reflective insulation is same in principle to every other forms of insulation considering that they reduce the amount of heat that penetrates or exits a home. Various kinds of insulation trap air within the insulation, not permitting it to escape. Reflective insulation is effective to minimize the flow of heat throughout an open airspace.

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    Reflective insulation Reflective insulation Document Transcript

    • REFLECTIVE INSULATIONIntroductionWhat is Reflective Insulation?Reflective insulation is typically made up of aluminium and also well-known as a DIYradiant barrier. It appears like metallic foil and has a reflective covering. It is very handyand very easy to install.In the use of reflective insulation, its primary purpose is to prohibit radiant heat fromtransmitting across open spaces. Reflective insulation decreases energy bills in thesummer, particularly in the warmer climates. This can also be used in some cases toreduce heating costs.Every type of insulation on the market comes with an R-value. The R-value is ratedcorresponding to a piece of insulations thickness and density. The R-value of reflectiveinsulation is calculated by how the heat flows in the home.Reflective Insulation © The DIY Green Store
    • Reflective insulation is same in principle to every other forms of insulation consideringthat they reduce the amount of heat that penetrates or exits a home. Various kinds ofinsulation trap air within the insulation, not permitting it to escape. Reflective insulationis effective to minimize the flow of heat throughout an open airspace.How it works?In order to understand how reflective insulation works, you’ll need to understand thethree methods of heat transfer. Conductive: the transfer of heat from one body to another. The bodiesmust be in contact for this to occur. Convective: the transfer of heat from one body to another using themovement of air or fluid. In this case the bodies are not in contact with each other. Theenergy is in the moving air.Reflective Insulation © The DIY Green Store
    • Radiant: the transfer of heat from one body to another by absorptionor emission of electromagnetic radiation.Conventional insulation (the pink stuff) works to slow down Conductive and Convectiveheat transfer. It resists this flow of energy. In fact the R value that is used to measureand compare these types of insulation is a measure of how much resistance theseproducts provide against the heat transfer. The higher the R value the more the productslows down the transfer.However, fiberglass insulation and other conventional insulation do not prevent radiantheat transfer. In fact what happens is at some point; the insulation absorbs as muchenergy as it can. When it is saturated in this way, it radiates the energy back out. So ona typical hot summer day, the pink stuff in the attic will start to radiate the heat from theroof into the attic.What is not well known is that radiant heat transfer accounts for the largest amount ofheat loss or gain in a structure or building. This is where reflective insulation (alsoknown as radiant barrier) comes in.Reflective Insulation © The DIY Green Store
    • Reflective Insulation Reflects the Radiant HeatReflective insulation uses a foil surface to reflect the heat rays back and prevent theradiant transfer. The perfect radiant barrier reflects 100% of the heat rays. While theproducts on the market today are not perfect, they are very close and reflect nearly 97%of the radiant heat.Consider that we want to keep the house is at a fixed temperature year round – say 68degrees. In the summer, what happens is the sun beats down on the roof so the atticheats up. The heat in the attic eventually transfers to the attic floor and to the main livingarea. Air conditioning simply takes the heat from the inside of the house and moves it tothe outside. Naturally, the more the inside of the house heats up, the more the airconditioner will have to work to move the heat out of the box. In the winter the heaterheats up the inside of the house. Now the outside of the house is cold and the heatReflective Insulation © The DIY Green Store
    • gradually escapes from the inside of the house to the outside. The colder it is outside,the more the heater will have to work to keep the inside at this temperature.Now let’s look at these two situations when reflective insulation is installed. Let’s saythat the reflective insulation is installed in the attic. When the heat beats down on theroof, the radiant heat that comes in is reflected back to the roof. The result here is thatthe attic temperature is lower. Less heat has transferred from the roof to the attic. As aresult, the air conditioner does not need to work as hard since there is less heat toremove.Similarly in winter months, the reflective insulation serves to prevent radiant heattransfer from the inside of the house to the outside. The heat is reflected back inside thehouse. Thus the heater needs to work less.Installation One of the great advantages that reflective insulationhas over conventional insulation is how much easier it is to install. There is no specialReflective Insulation © The DIY Green Store
    • clothing or gear to be worn. The two tools that you will need are scissors and a staplegun. In most cases, it’s measure, cut, lay, and staple.Don’t sweat getting it perfect. Another great thing about reflective insulation is it’sdealing with the radiant heat which travels in straight lines. It’s not going to snakearound corners. If there’s a truss in the way, make a scissor cut to allow for it and moveon.Below we have instructions for each of the typical applications of reflective insulation. Ifyour particular application is not covered here, please call us at 314-246-9349 and we’llbe delighted to help you.Reflective Insulation Installation in an Existing Home Retro FitThe simplest method here is to staple the insulation to the underside of your rafters.This will automatically create the required air-gap between the fiberglass insulation andthe reflective insulation. We don’t recommend installing reflective insulation by laying itdirectly on top of fiberglass. That results in two problems. First, there’s no air-gap.Second, it tends to collect dust which will reduce the effectiveness of the insulation.Reflective Insulation © The DIY Green Store
    • Reflective Insulation Installation in New Construction New ConstructionWhen installing during new construction, you will put the reflective insulation in-betweenthe roof decking and the top side of the rafters. The key is to drape the reflectiveinsulation so that there is space for airflow between the decking and the reflectiveinsulation.BenefitsSavings Let’s face it. This is where therubber meets the road. If there is not an impact in your pocket book, there’s nothing toReflective Insulation © The DIY Green Store
    • talk about. Here’s the short answer: Typical overall energy cost savings in both winterand summer are 17% to 25% of total costs.*Do we need to change the headline or do we have supporting evidence for it?*These savings make sense since the attic temperature is reduced in the summermonths by up to 30 degrees. That’s a lot less air conditioning required. Similarly in thewinter, the attic temperature is raised although not as much. Again, if less heat isescaping your house, your heater will run less frequently.The other area where savings occurs is with the government. At the moment (2011), theUS government is offering a tax incentive for certain home improvements that increaseenergy efficiency. Specifically, there is a 10% tax credit up to $500 for insulation.Seehttp://www.energystar.gov/index.cfm?c=tax_credits.tx_index for more details on thattax credit. SummerReflective Insulation © The DIY Green Store
    • Winter For More Information For more information about Reflective Insulation, visit our web site at http://www.thediygreenstore.com/ or call us at 314-246-9349.Reflective Insulation © The DIY Green Store