Is Blown-In Insulation the Best Option for Your Home’s Walls?

When considering insulation for your home, one of the key options that often arises is blown-in insulation. But is it the best choice for your walls? The answer depends on various factors, including the type of wall construction, energy efficiency needs, and budget. This article explores the advantages and drawbacks of blown-in insulation, helping you make an informed decision about whether it's the right fit for your home.

Professional Blown-in insulation installation, also known as loose-fill insulation, involves the use of materials like cellulose, fiberglass, or mineral wool that are blown into wall cavities. It provides good thermal performance and air sealing, but the effectiveness can vary based on your home's specific requirements. Let's dive deeper into the details.

Types of Blown-In Insulation

Blown-in insulation comes in several materials, each offering unique benefits. Here’s a comparison of the most common types:

Fiberglass Insulation

Fiberglass is one of the most commonly used materials for blown-in insulation. It’s lightweight, fire-resistant, and has a long lifespan.

Cellulose Insulation

Made from recycled paper products, cellulose insulation is another popular choice. It is a more environmentally friendly option compared to fiberglass.

Mineral Wool Insulation

Also known as rock wool or slag wool, mineral wool is another option for blown-in insulation. It’s made from volcanic rock or blast furnace slag and is naturally fire-resistant.

Things to Consider Before Making a Decision

Before opting for blown-in insulation, consider these key factors to ensure it’s the best fit for your home:

Wall Construction Type

Blown-in insulation is ideal for certain wall types, especially for retrofitting older homes with existing walls. If your walls are open (during construction or a remodel), blown-in insulation can be easily installed. However, if your walls are already finished, drilling holes may be necessary for installation.

Insulation Effectiveness

Blown-in insulation can fill gaps and voids in the wall cavities more effectively than batts or rolls, reducing air leaks. However, its effectiveness is largely dependent on the installation quality. Poorly installed insulation can lead to gaps that compromise its thermal performance.

Moisture Control

Moisture resistance is critical when selecting insulation, especially in areas prone to damp conditions. While fiberglass and mineral wool are naturally moisture-resistant, cellulose insulation can absorb moisture unless properly treated. This could lead to mold or mildew growth over time.

R-Value and Energy Savings

The R-value of insulation determines its ability to resist heat flow. Higher R-values are better for colder climates. Blown-in insulation typically provides good coverage for reducing heat loss, but the exact R-value will depend on the material used and the depth of insulation.

Budget and Installation Costs

Blown-in insulation can be more expensive than batt or roll insulation, but it’s also easier to install in difficult-to-reach areas. Installation costs vary depending on the material used and the size of the space to be insulated.

Advantages of Blown-In Insulation

Blown-in insulation offers several benefits over other insulation types, including:

Better Coverage in Hard-to-Reach Areas

Blown-in insulation is particularly beneficial in homes with irregularly shaped spaces, such as those with cavities or attics. It can fill these spaces more completely than batt insulation.

Air Sealing

Because it fills every nook and cranny, blown-in insulation can provide better air sealing. This reduces drafts, keeping your home warmer in the winter and cooler in the summer.

Higher Energy Efficiency

Properly installed blown-in insulation helps to lower energy bills by providing better thermal performance. This makes it a good choice for homeowners looking to improve energy efficiency and reduce heating and cooling costs.

Easier Installation in Existing Walls

If you're retrofitting an older home, blown-in insulation can be injected into walls without the need to tear down drywall, which is both time-consuming and expensive.

Drawbacks of Blown-In Insulation

Despite its benefits, there are some drawbacks to consider:

Installation Requires Professional Expertise

While it can be a cost-effective option, blown-in insulation must be installed by a professional. Improper installation can lead to gaps or uneven coverage, reducing its effectiveness.

Potential Settling Over Time

Blown-in insulation can settle over time, which may reduce its effectiveness. This is especially true for cellulose, which can lose volume due to moisture or age.

Higher Initial Cost

The initial cost of blown-in insulation, especially cellulose, can be higher compared to other insulation types like fiberglass batts. However, the long-term energy savings may offset the initial investment.

Technical Specifications

Here’s a quick reference for the technical specs of blown-in insulation types:

Common Questions

How long does blown-in insulation last?

Blown-in insulation can last anywhere from 20 to 50 years, depending on the material used and how well it was installed. Regular inspections can help extend its lifespan.

Can blown-in insulation be installed in walls with existing drywall?

Yes, blown-in insulation can be installed in walls with existing drywall, but it requires drilling holes in the drywall to blow the insulation into the cavities. Professional installation is recommended.

What is the R-value of blown-in insulation?

The R-value depends on the material used. On average, fiberglass offers an R-value of 2.2 to 4.3 per inch, while cellulose provides 3.2 to 3.8 per inch.

Is blown-in insulation better than batt insulation?

Blown-in insulation typically provides better coverage, especially in hard-to-reach areas, and can offer better air sealing. Batt insulation is generally less expensive but less effective in filling gaps.

FAQ

1. What’s the difference between blown-in and batt insulation?

Blown-in insulation is loose-fill, filling gaps more completely, while batt insulation comes in rolls and is easier to install in open spaces.

2. Can blown-in insulation be installed in walls with drywall?

Yes, small holes are drilled in the drywall to blow in the insulation, ensuring proper coverage.

3. How long does blown-in insulation last?

Blown-in insulation lasts 20 to 50 years, depending on the material and installation quality.

4. What’s the best type of blown-in insulation for walls?

Fiberglass, cellulose, and mineral wool are common options, with cellulose being eco-friendly and fiberglass being fire-resistant.

5. Is blown-in insulation energy-efficient?

Yes, it reduces drafts and heat loss, improving energy efficiency and lowering energy costs.

Make the Right Decision

Choosing the best insulation contractor for your home requires careful consideration of your needs, the climate in your area, and your budget. Blown-in insulation offers many advantages, including better air sealing and coverage of hard-to-reach areas. However, it does come with higher upfront costs and requires professional installation.

Evaluate your home’s unique circumstances and consult with an insulation expert to determine if blown-in insulation is the right choice for you.

Author and Reviewer:

Author: With over two decades of hands-on experience, Robert Lamothe, owner and lead installer of Lamothe Insulation, brings unparalleled expertise in spray foam insulation, carpentry, and building science. Since 2002, he has earned a reputation for precision, quality craftsmanship, and delivering energy-efficient solutions that stand the test of time. Lamothe Insulation is a family-owned and family-operated business, and Robert also owns the Goddard School of Auburn, an early childhood education school.

Reviewer: Ethan Taylor has 8 years of experience in spray foam insulation. He reviewed this content and suggested ways to simplify business outreach while keeping trust and professionalism intact.