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How Much Is Insulation Per Square Foot?

Insulation keeps your home at a comfortable temperature, saving you energy and money. It also reduces noise and mold. It warms a house in the winter and cools it in the summer by slowing down heat transfer through walls, floors, and ceilings.

Costs vary by installation method and material type. Fiberglass and cellulose are inexpensive, while spray foam and rock wool are more expensive.


The cost to add insulation will vary depending on the type of material and the size of the space. You can also factor in the installation method. Some methods require professional expertise, such as foam board insulation, while others are more DIY friendly, like fiberglass roll and batting.

Insulation costs per inch of thickness will vary, too. You’ll need to determine the R-value that you want – the higher the R-value, the more expensive the insulation will be. The R-value measures how well the insulation prevents heat loss in winter and heat gain in summer.

Choosing the right type of insulation will help you keep your home energy-efficient and comfortable. It will also increase your home’s value and save you money on your energy bills. In addition, you may qualify for a tax credit for installing insulation.

The minimum cost for an insulation project is $1,000, but the contractor will likely suggest insulating other areas at the same time to improve the overall efficiency of your home. This will ensure you get the best return on your investment and maximize your energy savings. This includes insulating your attic, exterior walls, garage ceiling, basement, and crawl space.


The cost of materials used to install insulation can vary widely depending on the type and material. The R-value of the insulation and its thickness will also influence the price per square foot.

Roll and batt insulation is made from flexible fibers such as fiberglass, mineral (rock and slag) wool, and cellulose. It is inexpensive, easy to install, and effective at preventing heat loss in the winter and heat gain in the summer. It is a good option for insulated walls and attics.

Blown-in insulation is more expensive than other types of insulation. It can be installed in existing homes or new construction. It is ideal for attics, basements, and crawl spaces. Its thickness helps to block moisture. It is available in open-cell and closed-cell varieties. The former is more breathable but has less R-value, while the latter is denser and provides an air and moisture barrier.

Fiberglass blown-in insulation is the most popular. It costs $0.40 to $0.60 per square foot. Owens Corning is the leading manufacturer of fiberglass insulation. Its blown-in product is called AttiCat and can be purchased from most hardware stores. Its material contains 85% recycled content and is treated to prevent insect activity and fungus growth. Other companies make blown-in insulation from recycled and natural materials such as slag and wood fibers.


The installation process for insulation can be time-consuming and complicated. However, the investment is worth it when you see the energy savings on your utility bills. In addition, you can add to your home’s value when you install new insulation.

The cost to insulate walls varies according to the type of insulation used and how easy it is to get to the wall cavities. Rigid foam boards and spray foam typically have the highest cost per square foot, while fiberglass batts and blown cellulose have the lowest. It’s also important to consider whether you need faced or unfaced insulation, and if it’s a good idea for your climate zone.

When adding insulation to existing homes, it’s important to clear the area and remove any nails or screws that might be in the wall cavity. A professional contractor can handle this task for you, but it’s best to hire one who is licensed and insured. This way, you can be sure that the insulation is properly installed and that the contractor complies with local and state safety regulations.

If you choose to install insulation on your own, it’s a good idea to rent a machine that feeds the material into the wall cavities. These machines are available at most large box stores for about $125 a day. This is a fraction of the cost to have a contractor do it for you.

Energy savings

Insulating your home is a smart investment that saves energy, money, and reduces greenhouse gas emissions. The cost of the insulation may be offset by lower energy bills, and you can usually recoup your investment within a few years. You can also get tax rebates and other incentives to help pay for the insulation.

There are many different types of insulation, and the costs vary depending on the type and materials chosen. Traditional insulation, such as fiberglass batts or rolls, is the least expensive. It is made of flexible fibers such as fiberglass, mineral (rock and slag) wool, cotton, and cellulose. It is effective at preventing heat loss in the winter and heat gain in the summer, but it is less effective at keeping moisture out of a home.

Other forms of insulation are more expensive, including wood fiber, foam boards, and spray foam. Foam board insulation is rigid and typically used as a supplementary layer of insulation on ceilings or interior walls. It is made of liquid polyurethane and is sprayed into cavities where it expands and hardens to form a thick, dense layer of insulation.

The cost of insulating your home depends on many factors, including the material, thickness, and R-value (the resistance to the transfer of heat). The higher the R-value, the more effective the insulation. The cost of installing insulation can also vary depending on the climate in which you live and whether or not you need to remove existing insulation before adding new insulation.