The cost of insulating an attic is between $1.01 and $1.71 per square feet, figures are based on a 500 square foot space. Price of insulation varies per home location and size of attic.
The Department of Energy estimates when an attic is properly insulated, overall energy costs can be reduced anywhere from 10 to 50 percent during colder months. Proper insulation has similar affects in warmer months by keeping the interior temperature stabilized. It is advised to hire an energy specialist who can pinpoint problem areas and help estimate exact installation costs whenever possible.
One of the easiest and most cost effective ways to insulate an attic is to add material to the floor. To make this a possibility, any items must be removed from the floor and stored elsewhere. It is not possible to put enough insulation below sub flooring to make it efficient, even if the home is located in a warmer climate. Typically, the old attic flooring must be removed and new insulation can be placed on top of the old.
The majority of insulation fibers are loosely packed in bags or can be blown into spaces by machine. Insulation machines can typically be rented from a local home improvement store. Machine installed insulation works best for attics that have irregular spaces.