by 
The Curious Bag
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<h4 class="dechead">On One Hand: Assess Your Situation
Different insulation materials produce a variety of "R-values," which is the resistance that the insulation has to heat conduction. Warmer climates and lower ceilings require lower R-values. The most common materials used are cellulose, fiberglass and rock wool, with cellulose providing the highest R-value per inch of thickness.
On the Other: At Least Meet Minimum Requirements
The Department of Energy suggests a minimum R-value of 30 for a typical household attic. Using 11 inches of fiberglass, 11 inches of rock wool or 8 inches of cellulose should achieve this. Colder environments may require an R-value of up to 60. Then, in order to determine the total square footage, measure the width and length of your attic and multiply.
Bottom Line
There are several factors to consider when insulating your attic, including your locale's climate, the design of your house and your budget. Regardless, try to meet minimum suggested requirements, as reducing the loss of heat through your attic could provide significant cost savings.
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