What Is Blow-In Insulation Made Of? Here’s What You Should Know
If you’re considering adding insulation to your attic or walls, you’ve likely come across the term blow-in insulation (also known as loose-fill insulation). But what exactly is it made of—and which type is best for your home?
At Premier North Insulation, we specialize in expert insulation solutions across Milwaukee, Waukesha, and surrounding areas. In this post, we’ll break down the most common types of blow-in insulation, what they’re made of, and where they work best.
1. Cellulose Blow-In Insulation
Material: Primarily made from recycled paper, especially old newspapers
Additives: Treated with boric acid and other fire-retardant chemicals
Eco-Friendly: Yes — often contains up to 85% recycled content
Best Uses:
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Attic floors
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Retrofitting closed wall cavities
Benefits:
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Excellent at sealing air leaks
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Resistant to pests and mold
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Environmentally friendly
Things to Consider:
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Can absorb moisture if not properly sealed or installed
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May settle slightly over time, reducing R-value if not properly installed
2. Fiberglass Blow-In Insulation
Material: Made from spun glass fibers, created using sand and recycled glass
Appearance: Light and fluffy—often white, pink, or yellow
Best Uses:
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Open attics
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Wall cavities in new construction
Benefits:
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Moisture-resistant and non-combustible
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Doesn’t settle much over time
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More cost-effective than spray foam
Things to Consider:
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Can irritate skin and lungs during installation
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Requires professional installation for optimal coverage and air sealing
3. Mineral Wool (Rock Wool) Blow-In Insulation
Material: Made from natural volcanic rock or steel industry byproducts
Fire Resistance: Extremely high—can withstand temperatures over 1,800°F
Best Uses:
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Soundproofing interior walls
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Homes requiring fire-resistant insulation (e.g. near a garage or furnace)
Benefits:
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Excellent sound-dampening
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Naturally fire- and mold-resistant
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Does not absorb moisture
Things to Consider:
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Higher cost than fiberglass or cellulose
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Less common and may not be offered by all contractors
Which Blow-In Insulation Is Right for You?
Each type of blow-in insulation has its strengths, depending on your home’s structure, budget, and energy-efficiency goals. At Premier North Insulation, we’ll evaluate your space and recommend the best option based on your needs—not just what’s easiest to install.
We also help you explore Wisconsin’s Focus on Energy rebates, which can significantly reduce your insulation upgrade costs.
Why Choose Premier North Insulation?
We’re proud to be one of Southeast Wisconsin’s trusted experts in blow-in insulation installation. Our team provides:
✅ Accurate R-value recommendations
✅ Professional, mess-free installation
✅ Honest pricing and free estimates
✅ Friendly, experienced technicians
✅ Local service you can count on
Get a Free Estimate Today
If your attic or walls need better insulation, blow-in could be the perfect solution. Contact Premier North Insulation today for expert guidance and high-quality results that last.
