When homeowners start researching energy-efficient upgrades for their homes, one of the most common questions we hear is “what is blown in insulation made of?” Understanding the materials used in blown in insulation is crucial for making an informed decision about your home’s comfort and how insulation impacts energy efficiency. As insulation professionals with 10 years of experience treating your home like our own, we’re here to break down everything you need to know about blown in insulation materials.
Blown in insulation, also known as loose-fill insulation, is a popular choice for attics, walls, and crawl spaces because of its ability to fill irregular spaces and create a seamless thermal barrier. But the effectiveness of this insulation depends heavily on the materials used in its construction.
What is Blown In Insulation Made Of?
Fiberglass Blown In Insulation
Fiberglass blown in insulation consists of tiny glass fibers that are manufactured from recycled glass and sand. This material is created by melting glass at extremely high temperatures and then spinning it into fine fibers. Here’s what makes fiberglass a popular choice:
- Fire resistance: Naturally non-combustible, providing excellent fire safety
- Moisture resistance: Won’t absorb water, preventing mold and mildew growth
- Durability: Maintains its R-value over time without settling significantly
- Cost-effective: Generally the most affordable option for blown in applications
- Non-toxic: Safe for homes and won’t emit harmful chemicals
The main drawback of fiberglass is that it can be irritating to skin and respiratory systems during installation, which is why professional installation is recommended.
Cellulose Blown In Insulation
Cellulose insulation is made from recycled paper products, primarily newspapers and cardboard, that have been treated with fire-retardant chemicals like boric acid. This eco-friendly option offers several advantages:
- Environmentally friendly: Contains up to 85% recycled content
- Superior air sealing: Denser than fiberglass, creating better air barriers
- Pest deterrent: The boric acid treatment naturally repels insects and rodents
- Sound dampening: Excellent acoustic properties for noise reduction
- Settling characteristics: May settle over time, requiring occasional top-offs
Cellulose performs exceptionally well in attic applications and is particularly effective at reducing air leakage, which can significantly impact your home’s energy efficiency.
Mineral Wool (Rock Wool) Blown In Insulation
Mineral wool, also called rock wool, is manufactured from volcanic rock or steel mill slag that’s melted and spun into fibers. While less common than fiberglass or cellulose, mineral wool offers unique benefits:
- Exceptional fire resistance: Can withstand temperatures over 2,000°F
- Water resistance: Naturally hydrophobic, repelling moisture effectively
- Pest resistance: Inorganic material that doesn’t attract rodents or insects
- Sound absorption: Superior acoustic properties compared to other materials
- Chemical resistance: Won’t break down from exposure to chemicals or pollutants
Choosing the Right Material
The best material for your home depends on several factors including your budget, climate, existing insulation, and specific performance needs. Each material has its place in different applications:
For budget-conscious homeowners, fiberglass blown in insulation provides excellent value and reliable performance. It’s particularly effective in attics where fire resistance and moisture control are priorities.
For environmentally conscious homeowners, cellulose offers the greenest option while providing superior air sealing properties. It’s ideal for homes where reducing air leakage is a primary concern.
For premium performance, mineral wool delivers the highest fire resistance and acoustic properties, making it perfect for homes near busy roads or in fire-prone areas.
Professional Installation Makes the Difference
Regardless of which material you choose, proper installation is crucial for optimal performance. Professional installers have the equipment and expertise to achieve the correct density and coverage, ensuring your insulation performs as intended. They also understand building codes, vapor barrier requirements, and proper air sealing techniques.
During installation, professionals use specialized blowing machines that fluff and distribute the material evenly, eliminating gaps and thermal bridges that can reduce efficiency. They also know how to work around electrical fixtures, recessed lights, and other obstacles safely.
Ready to Upgrade Your Home’s Insulation?
Now that you understand what blown in insulation is made of and the benefits each material offers, you’re ready to make an informed decision for your home. Our 5-star rated, experienced team specializes in attic insulation, crawl space services, and insulation removal and replacement.
Contact us today to schedule your consultation and start saving on your energy bills while improving your home’s comfort year-round.
