Radiant Barrier Insulation Video
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Radiant barrier chips are plastic chips that are coated with a highly reflective coating. They reflect heat back to its source. So in the summer, it reflects the heat from the sun back out of the attic. In the winter, the heat is reflected back down into the house. They are very effective.
A powered blower, much like a leaf blower, sucks the chips from a cardboard box and blows them into the attic. You want to achieve a layer of 7 - 8 layers of barrier chips. The advantage of this is if the top layer gets covered with dust, which blocks its reflective ability, the lower layers will continue to reflect the heat.
It is a great barrier insulation and is very easy to install.