When it comes to insulation, choosing the right material is the difference between a comfortable, cozy building and a drafty nightmare. The best type of insulation depends on a number of factors, from building age and architecture to energy efficiency goals. In many cases, blown-in insulation offers the right mix of flexibility and affordability.
Blown-in insulation is a loose-fill material that’s blown or sprayed into attics, walls, and hard-to-reach spaces using special blow-in insulation equipment. Unlike batt or rolled insulation, it fits into gaps and creates more complete coverage. Keep reading to explore four types of blown-in insulation and learn which is right for your residential or commercial construction project.
Blown-In Insulation vs. Batt Insulation
Blown-in and batt insulation look and function differently. The first is best for fast installation in existing structures. Batt insulation, on the other hand, is more suited for open walls during new builds. However, it needs to be installed perfectly. Poor installation can leave gaps, driving up utility costs and impacting comfort levels.
With blown-in insulation, you can expect superior coverage that minimizes leaks and cold spots. Our installers can quickly blow-in your insulation with no need to tear up walls or spend days on-site.
Common Applications
- Attic floors
- Enclosed wall cavities
- Around ductwork and pipes
- Retrofits and upgrades
1. Cellulose Blown-In Insulation
What Is Cellulose Insulation?
Cellulose insulation is made from finely shredded recycled paper and cardboard. It’s treated with non-toxic additives to resist fire, mold, and pests.
Pros
- High R-value per inch—typically R-3.4
- Made from up to 85% recycled content; highly eco-friendly
- Great air sealing, which helps block drafts
- Slows the spread of fire
Cons
- Absorbs moisture more than fiberglass or wool
- May settle over time if applied too loosely
Local Highlight
At Valley Insulation, we install Nu-Wool Cellulose—a leading product for Cincinnati’s climate, providing dense coverage and additional soundproofing.
2. Fiberglass Blown-In Insulation
What Is Fiberglass Insulation?
Loose-fill fiberglass is spun from molten glass, forming small, fluffy fibers that are blown into attics and wall cavities. The R-value per inch is a little bit lower than cellulose, typically R-3.1
Pros
- Resists fire naturally
- Retains shape (low settling risk)
- Doesn’t attract pests or promote mildew
- Budget-friendly and easy to install
Cons
- Can cause itching; protective gear needed for DIY installs
- May lose effectiveness if compressed or damp
Environmental Impact
Fiberglass insulation often contains up to 30% recycled glass and saves significant energy through reduced HVAC use. This makes it an eco-friendly insulation option.
3. Mineral Wool or Rock Wool Insulation
What Is Mineral Wool Insulation?
Mineral wool (including rock wool) is made from natural stone or slag, spun into a dense, airy material. The R-value per inch is usually between R-3.1 and R-4.3.
Pros
- Superior fire resistance (withstands extreme heat)
- Outstanding for soundproofing
- Moisture and mold resistant
- Stays stable, doesn’t settle much
Cons
- More expensive than cellulose or fiberglass
- Heavier material can be harder to install
- Can be irritating to skin and lungs—professional installation recommended
4. Spray-In or Loose-Fill Foam Insulation
What Is Spray-In Insulation?
A hybrid solution, spray-in foam insulation expands to fill gaps, creating a rigid barrier that insulates and blocks air leaks.
Types of Loose-Fill Foam Insulation
- Open-cell: Softer and cheaper, great for sound absorption but less moisture resistant.
- Closed-cell: Highest R-value, best for areas exposed to signs of moisture—think Cincinnati basements!
Best Uses
- Unusual cavities or hard-to-access small spaces
- Areas needing extra air sealing
Considerations
- Professional installation almost always required
- Generally higher cost than other blown-in types
- Some foams have higher global warming potential—ask about “green” alternatives with low-impact blowing agents
Which Type of Blown-In Insulation Is Best for You?
Consider these factors for Cincinnati homes and businesses:
Feature | Cellulose | Fiberglass | Mineral Wool/ | Spray Foam |
R-value (per inch) | 3.4 | 3.1 | 3.1–4.3 | Up to 6.5 (closed-cell) |
Eco-friendliness | ★★★★★ (recycled) | ★★★★☆ (some recycled) | ★★★★☆ (natural) | ★★★☆☆ (varies by formula) |
Cost | $–$$ | $–$$ | $$$ | $$$–$$$$ |
Best For | Most attics, walls | Attics, retrofit walls | Where fireproofing/soundproofing needed | Attics, crawlspaces, moisture-prone areas |
Cons | Moisture, settling | Skin irritation, compression | Price, weight | Higher environmental impact (some types) |
Blown-In Insulation Best Practices
- Seal air leaks first: Use caulk or spray foam around windows, doors, and plumbing penetrations to prevent air leaks.
- Target correct depth: Research the R-value required for your specific project (example: 11–14in of cellulose achieves R-38 to R-49 in attics).
- Ensure even coverage: Avoid gaps, settling, or overly compressed material for best results.
- Address moisture: Install vapor barriers where needed and avoid blocking attic ventilation.
- When in doubt, hire pros: Professional teams have the tools and know-how to insulate safely and effectively for Cincinnati homes and businesses.
Upgrade Your Insulation With Valley Insulation
Ready to boost indoor comfort and lower your bills? Whether you own a home or run a business in Greater Cincinnati, Valley Insulation is your trusted partner for blown-in insulation. Connect with us today for a free estimate and start saving.