Blown Cellulose Vs. Fiberglass: Which Insulation Is Better for Your Home?

When it comes to insulating your attic, homeowners in the Greater Toronto Area often ask us: Should I go with blown cellulose or fiberglass insulation? At Eco-Therma, we offer both—but knowing which one is right for your home depends on more than just R-value. Let’s compare them—and also discuss an often-overlooked step: mold prevention.

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Why You Should Inspect for Mold Before Insulating

Before adding any new insulation, it’s essential to inspect for mold or moisture issues in your attic. Old or compressed insulation, especially in homes with poor ventilation, often hides early signs of mold growth. Left untreated, this can lead to air quality problems, odors, and even structural damage.

At Eco-Therma, we always recommend a professional mold inspection and, if needed, antifungal treatment before proceeding with any insulation upgrade.

We offer eco-friendly mold removers and proven antifungal sprays to sanitize attic surfaces before applying blown insulation—whether it’s cellulose or fiberglass. This ensures your attic is clean, safe, and mold-resistant long-term.

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What Is Blown Cellulose Insulation?

Blown cellulose is made from recycled paper fibers treated with fire-retardants and mold inhibitors. It’s blown in to form a dense, seamless layer of insulation.

Pros:

-Eco-friendly and sustainable

-Excellent air sealing

-Superior soundproofing

-High R-value per inch (R-3.2 to R-3.8)

Cons:

-Can absorb moisture if not properly sealed

-May settle slightly over time

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What Is Fiberglass Insulation?

Blown fiberglass is made from spun glass fibers and is also installed using a blowing machine.

Pros:

-Budget-friendly

-Moisture resistant

-Non-settling

-Consistent R-value (R-2.2 to R-2.7)

Cons:

-Less effective at sealing air leaks

-Can leave gaps if not installed carefully

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Which One Should You Choose?

Priority Recommended Insulation

Best air sealing Blown Cellulose

Budget-conscious. Fiberglass

Mold-prone areas. Fiberglass (with vapor barrier / Mold Sealant)

Eco-friendly homes Blown Cellulose

Soundproofing Blown Cellulose

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Our Complete Attic Solution

When you choose Eco-Therma, you’re not just getting insulation. You’re getting:

-Full attic mold inspection

-Antifungal spray treatments

-Professional air sealing

-High-quality insulation upgrade

-Before-and-after photos & More

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Book Your Free Inspection Today !

Don’t insulate over a problem—fix it first. Book your free attic inspection in Toronto, Mississauga, Vaughan, or anywhere in the GTA and beyond. We’ll guide you through the safest, most energy-efficient option for your home.