Blown-In Cellulose vs. Spray Foam Insulation

When insulating a building, homeowners and contractors must often choose between two common materials: blown-in cellulose insulation and spray foam insulation. But how do you determine which one is right for your needs?

Here, we’ll discuss the differences between blown-in cellulose and spray foam insulation, offering key insights so you can make the best decision for your home. Read on to learn how you can improve the energy efficiency and comfort of your space.

Why Insulation Is Essential for Buildings

Before we get into the differences, let’s briefly discuss why insulation matters in the first place. Insulation plays a critical role in maintaining a comfortable indoor climate by reducing heat transfer between your home’s interior and the exterior.

It lowers energy consumption, keeps utility bills in check, improves indoor air quality, and even enhances the structure’s strength. Essentially, good insulation ensures year-round comfort while benefiting your wallet and the environment.

What Are The Differences Between The Two?

Distinguishing between blown-in cellulose and spray foam insulation will help you make an informed choice that suits your needs and budget.

Difference #1: Materials and Composition

Blown-in cellulose insulation is made primarily from recycled newspaper or wood fibers that are treated with additives like borate to enhance fire retardation and repel pests. It’s a popular eco-conscious choice thanks to its use of recycled materials.

Spray foam insulation, on the other hand, is a chemical-based product. It is made by combining two liquids, isocyanate and polyol resin, which react to expand into a foam. Spray foam is available in two types: open-cell and closed-cell, each offering different benefits.

Difference #2: The Installation Process

The installation methods differ significantly between the two options. Blown-in cellulose insulation is applied by blowing shredded cellulose into wall cavities or attics using specialized equipment. It’s quick and effective for filling hard-to-reach spaces.

Spray foam insulation requires professional application. The liquid components are sprayed onto surfaces, where they expand and solidify. This creates an airtight seal, making it an excellent choice for areas prone to air leaks.

Difference #3: R-Value

The R-value measures insulation’s resistance to heat flow. Blown-in cellulose typically has an R-value of 3.2 to 4.0 per inch, depending on its density. It provides adequate thermal resistance for most homes.

Spray foam insulation boasts a higher R-value. Closed-cell spray foam can range from 6.0 to 7.0 per inch, making it one of the most efficient insulators available. Open-cell spray foam has a lower R-value of approximately 3.5 per inch, but it still provides excellent thermal insulation.

Difference #4: Cost Comparison

Cost is often a deciding factor for homeowners. Blown-in cellulose insulation is generally more affordable, costing around $1 to $1.50 per square foot for installation. Spray foam insulation is significantly more expensive, typically ranging from $3 to $7 per square foot, depending on the type and application. While the upfront cost is steep, it can provide long-term savings on energy bills.

Difference #5: Environmental Impact

Blown-in cellulose is the clear winner in terms of eco-friendliness. Made from 80 to 85 percent recycled materials, it has a lower carbon footprint and reduces landfill waste. Spray foam, being a petroleum-based product, is less environmentally friendly. However, its long lifespan and energy efficiency can offset its initial environmental impact over time.

Difference #6: Soundproofing Capabilities

If soundproofing is a priority, both options are solid contenders. Blown-in cellulose excels in reducing sound transmission due to its dense composition, making it ideal for noisy neighborhoods or homes with multiple stories. Open-cell spray foam also provides good soundproofing properties as it absorbs sound waves. Closed-cell spray foam, however, is less effective in this regard.

Difference #7: Resistance to Mold and Pests

Blown-in cellulose is treated with borate, which deters pests and mold growth. However, if it becomes wet, cellulose insulation can lose its effectiveness and may need replacement. Spray foam insulation is naturally resistant to mold due to its moisture barrier qualities. Its airtight seal also prevents pests from infiltrating the insulated spaces.

Difference #8: Lifespan and Durability

Blown-in cellulose insulation typically lasts 20 to 30 years but may settle over time, which can reduce its effectiveness. Regular maintenance and top-ups might be necessary. Spray foam insulation can last as long as the structure it’s installed in without losing its shape or thermal properties, making it a more durable option.

Difference #9: Air Sealing Properties

One of the biggest advantages of spray foam is its superior air-sealing properties. Closed-cell spray foam forms an airtight barrier, significantly reducing air leaks and enhancing energy efficiency. Blown-in cellulose, while effective at filling gaps, doesn’t offer the same level of air sealing. It’s more suitable for areas where air leakage isn’t a major concern.

Difference #10: Fire Resistance

Both insulation types are treated for fire resistance, but they differ in performance. Blown-in cellulose, with its borate treatment, provides good fire retardation and slows the spread of flames. Spray foam’s fire resistance depends on the type. Some spray foam products require an additional fire-resistant coating to meet building codes. Always check the product’s fire rating before installation.

Tips for Choosing the Right Insulation

When deciding between blown-in cellulose and spray foam insulation, consider the following factors:

• Budget: If cost is a constraint, blown-in cellulose may be the better choice.

• Efficiency: For maximum energy savings, go with spray foam insulation, particularly closed-cell foam.

• Environmental concerns: Opt for blown-in cellulose if reducing your carbon footprint is a priority.

• Location: Evaluate the area being insulated. Spray foam is ideal for air sealing basements or crawl spaces, while blown-in cellulose works well in attics and walls.

• Durability: If you’re looking for a long-term solution with minimal maintenance, spray foam insulation is the way to go.

Ultimately, the best insulation for your building will depend on your unique requirements and goals.

Build a Comfortable, Energy-Efficient Space With the Right Insulation

Both blown-in cellulose and spray foam insulation offer unique benefits for a wide range of needs. Blown-in cellulose shines as an affordable and eco-friendly option, while spray foam excels in terms of efficiency, durability, and air sealing. For those looking at blown-in cellulose versus spray foam insulation, understanding these differences can help you make an informed decision that aligns with your needs and budget.

Are you still unsure of which type of insulation is right for your application? The experts at HandCrafted Hose Company are here to answer any questions about equipment or application. See how our spray foam insulation hose can help you achieve the desired results with less effort!