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Some more info for you to read about Insulation - http://www.energysavers.gov/your_home/insula...
See the different types of insulation and the purposes they serves and where they are applied.
Also the jury is out on the radiant barrier. They can be tricky to install, and can trap moisture if they are not punched with tiny holes to allow for moisture transfer. As they act as a 2nd vapor barrier and can cause the insulation to become damp.
Once the radiant barrier becomes dusty, it looses some of its ability to prevent the heat gain into the attic area.
Fiberglass insulation also has several drawbacks. It allows for air to move freely through it. As this occurs it lowers the ability of the insulation to stop the heat loss or gain.
If your planning to insulate, you should really look into foam. Its a bunch higher in cost over the fiberglass, but its R value and its ability to stop air flow and stop moisture makes it a great choice.
A good example is the foam cup you put your coffee in. That little 1/8 inch thick cup prevents the scalding water from burning your hand. Imagine what five or six inches can do?
W.E. is correct about the type or manufacturer of the barrier. Their are a few attic foil manufacturers that are heavy duty and perforated. Foam is best if applied correctly. Attic foil can be DIY to cut cost.
They work together and compliment each other to provide maximum defense against heat gain/loss. Check out the website www.AtticFoil.com for install pictures, videos and complete information or my blog at http://www.radiantbarrierguru.com/ - hope this helps.