The Various Forms of Radiant Barrier Insulation
There are several different ways to manufacture radiant barrier insulation, as well as different ways to have it installed. The radiant barrier can be made of any foil-faced reflective material that has a reflectivity of at least 90%. The material that is most often used is aluminum single-sided foil, double-sided foil, or multilayered foil. Reflective paint or paint chips called radiant barrier chips can also be used instead of a large piece of foil. The radiant barrier is constructed of a flat piece of cardboard, plastic or plywood and covered with the reflective material of choice. Ultra strong attic foil is another material that is often used for radiant barrier insulation. Whichever type of barrier you decide on, it should have perforated holes in it so that water vapor is able to move through so that condensation doesn't build up.
For a residential dwelling, radiant barrier insulation can be installed in the attic, above the roof, in the basement walls or underneath a crawl space and in stud walls. If a house is already constructed, the easiest method of installing the radiant barrier insulation is laying it on the attic floor. For areas with a predominantly warm climate, it is recommended to staple the reflective sheeting to the bottom of the roof rafters. For heat transfer the reflective side should be facing down, towards the attic floor. If you have double sided
insulation, it doesn't matter on which side it is applied.
In predominantly cold climates, the best way to install the radiant barrier insulation to an already existing home is to the attic floor. It is absolutely necessary for the insulation in cold climates to have perforation so that water vapor doesn't collect and freeze. The desired method of installation would be to install the radiant barrier insulation below the roof decking. If your home is already built, this isn't going to be an option.
If you are doing any significant remodeling, you can add the radiant barrier insulation to stud walls. This will give you extra protection against harsh temperatures and reduce your energy bill significantly. With the ability to reflect up to 97% of radiant heat, you will certainly see the benefits of the extra insulation immediately.
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