The Ultimate Guide To Types Of Attic Insulation

Are your energy bills higher than you’d like here in Wisconsin? Do you feel too cold during the winters and too hot in the summer? Your attic might be the issue. Poor attic insulation can cause significant heat loss or gain, affecting your home’s comfort and energy efficiency. That’s why it’s essential to understand the importance of attic insulation and the different options you have to make your home more comfortable and energy-efficient.

In this blog post we will explain everything you need to know about attic insulation to help you choose the right one for your home and climate. 

*Please note that price ranges listed in this article may not reflect the final cost of your project. Prices are subject to change based on various factors such as local labor rates, material quality, and more. All costs established in this article are rough estimates based on average industry rates. 

Understanding Attic Insulation

What Is Attic Insulation?

For any homeowner, attic insulation plays a crucial role in enhancing a home’s energy efficiency and comfort by regulating indoor temperatures. Installed in the attic space, it prevents heat transfer between living areas and the attic, reducing the need for excessive heating and cooling. 

Effective attic insulation can save homeowners up to 15% on heating and cooling expenses, translating to an average savings of 11% on total energy costs.

Why Insulate Your Attic?

• Saves You Money: Reduces heating and cooling costs significantly.
• Increases Comfort: Maintains consistent indoor temperatures.
• Improves Air Quality: Keeps out outdoor pollutants.
• Preserves The Home: Prevents moisture damage.
• Extends HVAC Lifespan: Reduces strain on heating and cooling systems.

How Does Attic Ventilation Work?

Attic insulation is a barrier preventing heat transfer between the attic and living spaces. It traps heat indoors during winter, reducing energy loss through the roof. In summer, it blocks heat from entering the attic and spreading through the house. This maintains a comfortable indoor temperature year-round, cutting energy use and lowering utility bills.

The Importance of R-Value in Attic Ventilation

The R-value is an essential indicator of how well house insulation will perform. Insulating the attic with high R-value materials is critical for increasing a home’s energy efficiency and comfort. Attic insulation with a recommended R-value of 49 to 60 can significantly reduce heat transfer, lower energy costs, and ensure year-round indoor temperatures.

Also Read: Understanding the Key Components of a Roof

What Are The Different Types Of Attic Insulation?

Now that you know everything about attic insulation, let’s delve in to learn about the different types of attic insulation that are available for your home:

#1. Fiberglass Batt Insulation

R-Value: R-2.9 to R-3.8 per inch

Cost: $1 to $1.50 per square foot

The first option on our list is fiberglass batt insulation, which is popular for attics due to its affordability and versatility. It’s made from flexible fiberglass fibers formed into batts or rolls, which come in various thicknesses and R-values. Easy to install and cut to fit around obstacles, it provides cost-effective thermal and acoustic insulation, improving energy efficiency and reducing noise.

• Cost-effective
• Easy to install
• Widely available
• Provides good thermal and acoustic insulation

#2. Cellulose Insulation

R-Value: R-3.5 per inch

Cost:  $0.60 to $4.20 per square foot 

The second option, cellulose insulation, made from recycled paper treated with fire retardants, is blown into attics and walls as a loose-fill material. It effectively fills gaps, offers good thermal performance, and dampens sound. Even though it requires professional installation for optimal density, it’s eco-friendly and offers long-term energy savings.

• Made from recycled materials
• Provides excellent air sealing
• Effective in enclosed spaces
• Helps reduce noise transmission

#3. Blown-In Fiberglass Insulation

R-Value: R-3.2 to R-4 per inch

Cost: $0.50 to $2.50 per square foot

Similar to cellulose, blown-in fiberglass insulation is also blown into attics to fill gaps and conform to irregular spaces. It’s easy to install, provides consistent thermal resistance, and is ideal for retrofitting existing homes without major renovations. Professional installation ensures uniform coverage and maximum efficiency.

• Fills cavities and hard-to-reach areas
• Ideal for retrofitting existing walls
• Maintains R-value over time
• Provides uniform coverage

#4. Spray Foam Insulation

R-Value: R-3.6 to R-3.9 per inch

Cost: $1 to $2 per square foot

Spray foam attic insulation expands and hardens upon application, creating an air-tight seal. It’s effective for attics, walls, and cavities, reducing air leaks and improving thermal efficiency. While more expensive, it offers superior insulation for complex attic shapes and enhances indoor air quality by minimizing allergens and pollutants.

• Excellent air-sealing properties
• High R-value per inch
• Adds structural strength to walls
• Moisture and mold resistant

#5. Rigid Foam Board Insulation

R-Value: R-6.5 and R-6.8 per inch

Cost: $0.60 to $2 per square foot

Rigid foam boards like EPS or XPS resist heat transfer and are installed on attic floors or against the roof decking. Durable and moisture-resistant, they provide excellent thermal performance and help prevent mold growth. Though they can also be expensive, they offer long-term energy savings and enhanced attic comfort.

• High R-value per inch
• Ideal for exterior walls and foundations
• Moisture and mold-resistant
• Provides a continuous layer of insulation

#6. Reflective Foil Insulation

R-Value: R-3 to R-17 per inch

Cost: $0.25 to $2 per square foot

This type of insulation uses a layer of reflective foil to minimize heat transfer by redirecting radiant heat away from the insulated area, unlike traditional house insulation materials that absorb heat. 

It’s typically constructed by backing a foil layer with paper or plastic, creating an air gap that enhances the foil’s ability to reflect heat. This type of insulation is especially beneficial in hot climates, where it effectively reduces heat gain in attics and other spaces.

• Reflects up to 93% of radiant heat
• Reduces cooling costs in hot climates
• Prevents heat loss in cold climates
• Lightweight and flexible

#7. Structural Insulated Panels (SIPs)

R-Value: R-5 to R-7 per inch

Cost: $10 to $18 per square foot

Another great option is SIPs, which are prefabricated panels with a foam core between structural facings like OSB or metal. They combine insulation and structural support, offering high thermal performance and an air-tight seal. 

SIPs streamline the construction process and reduce material waste, but they involve higher initial costs, making them ideal for new constructions or major attic renovations aiming for energy efficiency and durability.

• Provide excellent thermal and structural performance.
• Faster construction time
• Airtight and energy-efficient
• Suitable for walls, roofs, and floors

Factors To Consider When Choosing Attic Insulation

When you’re selecting attic insulation for your home, it’s important to think about a few different factors to ensure your choice performs well and lasts for the long-term. 

1. Insulation Strength (R-value):

The R-value measures how well the insulation can resist heat flow. Higher R-values mean better insulation. Choose insulation with an appropriate R-value for your climate to keep indoor temperatures comfortable and energy costs low.

2. Climate and Location:

Where you live affects which insulation is best. Wisconsin’s cold climate requires insulation with high R-values to keep warmth in, while you may want insulation with a lower R-value in locations that experience frequent warmth. If you live somewhere humid, you also want to ensure that the insulation you choose is able to resist moisture damage. 

3. Installation Needs:

Different types of insulation require different installation methods. Some, like spray foam, need professional installation in order to make sure it’s installed correctly and works effectively.

4. Sealing Air Leaks

Before installing any type of insulation, seal air leaks in the attic. Leaks let air escape, making insulation less effective. Use caulk or weatherstripping to keep air in and maintain your home’s temperature.

6. Cost vs. Benefits

The immediate cost of attic insulation matters, but always consider the long-term too. Quality insulation saves energy and improves the comfort within a home, leading you to save more money over time as you reduce your energy bills. 

Conclusion

Proper attic insulation is crucial for energy efficiency and home comfort. Understanding the types of insulation you can choose from, and their respected R-values allows you to be informed and choose the right insulation for the needs of your home. While some may have a higher upfront cost compared to others, it pays off with long-term energy savings and improved comfort.

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