Attic Insulation Installation Cost Guide

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How Much Does it Cost to Insulate an Attic?

Your attic may be out of sight most of the time, but it affects the rest of your home nonetheless. Because of this, one of the best things you can do for your home is install insulation in your attic. Attic insulation comes with a variety of benefits, including reduced energy bills, less air leakage, more stable temperatures throughout the home, and better air quality.

Cost and Considerations

Average Cost of Attic Insulation Installation

Attic insulation installation ranges from $1.50 sq/ft. to $2.45 sq/ft.

The average cost of attic insulation installation is $1.80 sq/ft.

Service pros removing old attic insulation

Additional Considerations That Cause Pricing to Vary

The price of attic insulation installation will vary depending on a number of factors. These factors include:

Attic size
Vent chute requirements
Material (cellulose, fiberglass, foam, or wool)
Brand

Types of Attic Insulation

Blown-in

Blown-in Insulation Installation

Blown-in attic insulation uses loose material such as cellulose or fiberglass to cover any area of your attic in need of insulation. The loose material is spread with a hose to fill gaps, cavities, wall joists, and other spaces.

The installation process is fast and minimally disruptive, usually requiring just a few hours and a few installers.

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Foil Radiant

Foil Radiant Insulation Installation

Foil radiant barriers are excellent supplements to attic insulation, effectively reducing the amount of heat that can enter the home. These radiant barriers use aluminum foil to reflect heat, preventing heat from accumulating in your attic and traveling through the home.

If you live in a region with an especially warm or hot climate, a foil radiant barrier will keep things cool.

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Spray-on Radiant

Spray-on Radiant Insulation Installation

Spray-on radiant barriers are a coating with heat reflective properties that will help prevent heat from entering or leaving the home. This coating is sprayed throughout your attic to ensure minimal heat transfer between the inside and outside of your home.

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What is R-Value?

R-value is a measurement of how well a material can resist conducting heat. Different types of insulation have different R-values, with higher R-values meaning more resistance to heat flow. R-value is determined by the type of material used, as well as the thickness and density of the insulation. The right R-value for your home depends on a number of factors, including your climate, HVAC system, and the area of your home you would like to insulate.

Our qualified attic insulation installers will identify the best R-value for your home based on the region you live in, the HVAC system you use, and the space you want insulated.

Frequently Asked Questions

What factors affect the cost of insulating an attic?

The main considerations affecting attic insulation cost are attic size, the insulating material used, the brand of the insulation, and any vent chute requirements you may have. However, other factors may include how difficult it is to access the attic and damage to existing insulation/attic space from rodents or ice dams.

How do I determine the size of my attic for insulation?

The simplest way to measure your attic size is to multiply the length and width of your attic to get its square footage. Alternatively, you can use the length and width of your home's footprint, including the garage and porches, to find the square feet of your attic. Also, you may need to account for the angle of your roof. To do this, multiply the attic's square footage by a pitch factor of 1.1 to 1.5, depending on the slope of your roof.

What types of insulation are available for attics?

The types of insulation available through The Home Depot are:

Blown-in
Foil Radiant
Spray-on Radiant

Is it worth it to insulate an attic?

Quality attic insulation can reduce heating and cooling costs by helping regulate the temperature of your home. Just as well, it will help protect your roof by preventing ice dams from forming in cold weather.

Can I insulate my attic myself to save money?

Yes, you can insulate your attic yourself. If you choose to do so, ensure the space is clean before working, check for damage or potential air leaks, and properly measure the space so you don't leave any gaps in coverage when installing your insulation. When in doubt, be sure to hire a professional installer.