How Much Does Blown-In Attic Insulation Cost?

Looking for blown-in insulation services for your home, but are unsure about the costs? As of now, in 2025, the average cost of blown-in insulation ranges from $1.50 to $2.80 per sq ft or $1,500 to $2,800 for a 1,000-square-foot area. However, calculating the average cost of blown-in insulation isn’t as simple as it looks. Multiple factors affect the cost, such as the type of insulation material, its size, availability, resistance value (R-value), or insulation thickness. 

Blown-In Insulation: Loose Filling The Cavities And Enclosed Spaces

Ever wondered what blown-in insulation is? Well, it’s the type of insulation material, loose-filled or blown into wall cavities, attics, and other enclosed spaces using specialized equipment. 

Its like a shape shifter, knows how to conform to any shape of the space it is filled into. It not only fills gaps but also provides an effective thermal barrier.

Factors Affecting The Cost Of Blown-In Insulation

Did you know that in warmer climates like Florida, it is commonly recommended to use R-38 insulation for an increased thermal barrier? Different regions have different needs. Just like that, the cost of blown-in insulation is not one-dimensional; multiple factors play a role in collectively affecting the average cost of installing blown-in insulation. 

Here are the major factors affecting the cost:

1. Insulation Type: Know Your Material

Since it is a cost-effective and efficient home insulation and improvement method, it comes in different forms. Three materials are used mainly for blown-in attic insulation. Here’s an explanation of these insulating materials:

✅ Cellulose Insulation

• Made from recycled paper treated with fire retardants
• An eco-friendly option 
• Ideal for filling enclosed spaces and reducing air leaks. 
• Has a higher density and can provide better insulation and thermal resistance
• Boasts an R-value of about R-3.2 to R-3.8 per inch, requiring less material
• Can absorb moisture, potentially leading to mold or decay if not properly sealed. 
• Attic Insulation should be about 10 inches to achieve R-38

✅ Fibreglass Insulation

• Commonly used in attic insulation due to its affordability and ease of installation.
• A cost-effective option 
• Performs well in warmer climates like Florida to help reduce heat transfer
• Contributes to lower energy bills.
• has an R-value of approximately R-2.5 to R-4.0 per inch, 
• Helps with areas where moisture resistance is important.
• Recommended thickness at the attic should be approximately 12 inches to achieve R-38.

✅ Mineral Wool Insulation

• Made from molten rock and steel slag
• Offers fire resistance and sound absorption.
• Ideal for areas requiring high thermal resistance, such as exterior walls and attic floors.
• R-value of R-3.0 to R-3.3 per inch, providing consistent insulation even at higher temperatures. 
• Moisture resistant and does not support the growth of mold or fungi. 
• Offers durability and long-term benefits that overshadow its initial cost. 

Here’s an average cost estimation of different insulating materials:

2. Labor cost: Factor of Complexity and Time Taken

Apart from the material used, labor cost also affects the average cost of the insulation installation, with multiple factors associated, like project complexity, the time taken, the size of the attic, the region, and whether insulation installation also includes insulation removal services.

3. Regional variations: Living Conditions and Availability Matters

Regional Variations also affect the average cost of blown-in insulation installation. Why? Because local labor rates, material availability, and climate conditions differ from place to place. For instance, 

4. R-value: The More The Merrier 

Apart from that, another important factor is R-value; the ability to create a thermal barrier is basically the resistance value. The higher the value, the more efficient and costly it will be. Here’s an average price range:

5. Supplementary Factors: Size of the Attic and Air Sealing

Other factors include an additional air sealing barrier or a moisture barrier if the insulation alone is not enough. Moreover, if you decide to do DIY rather than calling a professional, you might save on the labor cost, but will have to pay for equipment rental. 

Conclusion

Hence, in conclusion, the average cost of blown-in insulation varies significantly based on two factors: the type of material used and the region. The type of material includes R-value, moisture resistance, and installation complexity. Whereas, the regional variations include labour costs, climate factors, thickness requirements, etc. 

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