Choose Rockwool, Fiberglass, or Cellulose for Ultimate Comfort!

Wall Insulation

By MAG Insulation

Summary: Insulating your home is a crucial decision for comfort, energy efficiency, and cost savings. Among the popular insulation types are Rockwool (Mineral Wool), Fiberglass Insulation, and Cellulose Insulation. Here’s a deep understanding of each type, their benefits, challenges, and nuanced issues. This thorough analysis aims to guide homeowners and contractors in Michigan through the intricacies of choosing the right insulation. Embrace the journey of making an informed decision for a cozier, energy-efficient home with valuable insights provided below.


Rockwool (Mineral Wool) Insulation

Rockwool, also known as mineral wool, stands out as a highly effective insulation service option. Renowned for its remarkable R-value per inch, which is approximately 22-37% higher than fiberglass insulation service, it provides superior thermal resistance. This means better insulation performance, leading to enhanced heat retention and reduced energy loss.

Environmentally Friendly

Rockwool consists of 70% recycled material, making it a responsible choice for environmentally conscious homeowners. In comparison, fiberglass typically contains 20-30% recycled content. By opting for Rockwool insulation, you’re actively contributing to a sustainable future without compromising on the insulation performance of your home.

Superior Soundproofing

The higher density of Rockwool makes it excellent at reducing noise transmission. This makes it an ideal choice for areas where soundproofing is paramount, such as home theaters or recording studios. Unlike fiberglass, Rockwool’s stiffer batts don’t flop over easily, allowing for a smoother insulation installation process.

Resistant to Water and Mold

An additional benefit of Rockwool is its hydrophobic property, which means it repels water. This feature prevents water absorption, reducing the risk of mold and mildew growth. This makes it a reliable choice for environments where moisture might be a concern.

Drawbacks of Rockwool

However, Rockwool does come with a few drawbacks. The cost is a significant consideration, as Rockwool is often 25-50% more expensive than fiberglass insulation service. Additionally, it might not be as readily available in various sizes and formats. Rockwool is heavier, posing challenges for ceiling installations and requires specific tools like a serrated bread knife or wood saw for cutting batts to size.

Available Varieties

Rockwool is available in various types, such as Rockwool Comfortbatt with different R-values (R15, R23, R30), and Rockwool Safe’n’Sound, which offers excellent fire and soundproofing attributes. These varieties ensure you can choose the most suitable option for your specific needs.


Fiberglass Insulation

As one of the most commonly used insulation materials, fiberglass offers affordability and versatility. It provides a good overall R-value, albeit not as high as Rockwool. The extensive availability of fiberglass in a variety of sizes and formats ensures it can cater to different insulation quality needs and preferences.

Recycled Content and Lightweight

Fiberglass contains a percentage of recycled material, typically ranging from 20-30%. It’s a lightweight material, making it easy to handle and install across multiple applications using basic tools. Loose-fill options make it easier to fill odd wall cavities or add insulation to the attic without significant difficulty.

Challenges with Fiberglass

Despite its benefits, fiberglass has a few downsides. It can lose its desired R-value when compressed, which reduces its insulation effectiveness. Furthermore, if fiberglass gets wet, it can absorb water, compromising its R-value and insulation performance. While it is non-combustible, it lacks the enhanced fire resistance of Rockwool. Its lower density also makes it less effective at soundproofing compared to Rockwool.

R-Values for Different Thicknesses

Fiberglass batts come with varied R-values based on their thickness:

  • For 2×4″ walls: R11 to R15


  • For 2×6″ walls: R19 to R23


  • For 2×8″ walls: R25 to R31


  • For 2×10″ walls: R26 to R37



Cellulose Insulation

Cellulose Insulation is a cost-effective solution commonly used in residential applications. Its low initial cost makes it an appealing choice for many homeowners. However, it’s crucial to acknowledge that cellulose has a lower R-value compared to Rockwool and fiberglass, affecting its long-term energy-saving potential.

Eco-Friendly Composition

Primarily made from shredded paper and cardboard mixed with fire and mold retardant agents, cellulose is an eco-friendly choice with a significant amount of recycled content. It aids in creating a healthier indoor environment and has fire-retardant properties, adding to its attractiveness as a green insulation option.

Ideal for Retrofit Applications

Cellulose insulation is particularly suitable for retrofitting situations where tearing down walls to install traditional insulation isn’t feasible. It can be blown into wall cavities using specialized equipment, offering convenient and efficient installation without the need for extensive finishing work.

Challenges with Cellulose Insulation

One common issue with cellulose insulation is settling over time. This can lead to drafts and reduced insulation performance in wall cavities. To counteract settling, periodic topping off might be necessary. Additionally, the installation process requires access to a blower, which might need to be rented.

R-Values of Freshly Blown-In Cellulose

The R-values for freshly blown-in cellulose insulation are:

  • For 2×4″ walls: R11


  • For 2×6″ walls: R17


  • For 2×8″ walls: R23


  • For 2×10″ walls: R30



Considerations for Choosing the Best Insulation

When deciding between Rockwool, fiberglass, and cellulose insulation, you need to weigh several factors such as budget, desired R-value, ease of installation, and specific application requirements. Each material has its unique set of advantages and disadvantages. Here are some aspects to consider:

  • Budget: Rockwool is more expensive but offers better thermal and acoustic properties. Fiberglass is a cost-effective option with decent performance, while cellulose is the most affordable but has a lower R-value.


  • Thermal Resistance: Rockwool has the highest R-value, followed by fiberglass, with cellulose having the lowest.


  • Soundproofing: Rockwool excels in soundproofing due to its high density. Fiberglass offers moderate soundproofing, and cellulose provides decent noise reduction but may not be as effective as Rockwool.


  • Environmental Impact: Both Rockwool and cellulose are more eco-friendly options compared to fiberglass. Rockwool contains a significant amount of recycled material, and cellulose is made primarily from recycled paper and cardboard.


  • Moisture Resistance: Rockwool’s hydrophobic properties prevent water absorption, making it resistant to mold and mildew. Fiberglass and cellulose can absorb water, potentially compromising their performance.


  • Installation: Fiberglass is easy to handle and install. Rockwool requires specific cutting tools due to its high density, and cellulose installation involves blowing it into wall cavities, which may require specialized equipment.



Trust MAG Insulation Services for Expert Assistance

If you’re unsure about which **service choice insulation** option is best suited for your needs or need expert assistance in deciding, the experienced professionals at MAG Insulation Services are here to help. Contact us today for expert advice, information, or to schedule an order for high-quality insulation products. Our comprehensive services include insulation installation services, energy inspections insulation, professional sealing services insulation, and more. Trust MAG Insulation Services to provide the insulation solutions you need for a comfortable and energy-efficient space.


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