At Lamothe Insulation & Contracting, we’ve been asked this question time and time again: Is dense pack cellulose a better alternative to fiberglass insulation? It’s not just a comparison of materials. It’s a matter of long-term comfort, efficiency, and peace of mind. For homeowners and builders across Massachusetts looking to make a smart, lasting decision, this guide offers a clear answer, grounded in hands-on experience.
We’re not just comparing technical specs we’re showing you how real-world performance, cost-efficiency, and sustainability align with the unique needs of homes in our region. By the end, you’ll understand why so many of our clients choose dense pack cellulose and why it might be the best option for your next project.
The insulation market is filled with choices. But not all materials are created equal. Dense pack cellulose and fiberglass are both popular, yet they perform very differently in key areas.
Dense pack cellulose provides superior air sealing due to its densely packed nature. Unlike fiberglass, which often leaves gaps and requires a perfect fit to be effective, cellulose settles into cavities tightly. That means fewer drafts, better indoor temperature consistency, and reduced HVAC cycling.
We’ve insulated homes where previous fiberglass installations left cold spots in winter. After switching to dense pack cellulose, clients immediately noticed a difference in comfort and lower energy bills. It’s not just about R-values it’s about real thermal performance in real homes.
Cellulose resists settling and holds its shape over time. Fiberglass, by contrast, can slump or compress, reducing effectiveness. We’ve returned to older homes with fiberglass installations that had visibly degraded. Dense pack cellulose maintains a tight, effective fit for decades when professionally installed.
That’s why when we retrofit older homes, we often recommend replacing fiberglass with dense pack cellulose. It restores performance without needing structural changes.
Cold winters and humid summers demand insulation that performs year-round. That’s where cellulose shines.
Dense pack cellulose is treated with borates natural minerals that deter mold, pests, and fire. This makes it a better fit for our region, where moisture management is critical. Fiberglass lacks these natural resistances and can trap moisture, especially in poorly ventilated areas.
We often see attic fiberglass installations that have become breeding grounds for mold after ice dams. Our cellulose applications offer peace of mind in these situations moisture dries out, and mold doesn’t take hold.
Another overlooked benefit: cellulose is significantly better at soundproofing. Whether you’re trying to cut down on road noise, keep music contained, or quiet plumbing walls, cellulose offers a tangible improvement. Our clients in high-traffic areas consistently comment on how much quieter their homes feel after installation.
Today’s homeowners are making greener choices, and insulation is part of that.
Dense pack cellulose is made from up to 85% recycled paper. Fiberglass, by contrast, is composed of sand and chemicals, often requiring more energy to manufacture.
By choosing cellulose, our clients are reducing landfill waste and supporting sustainable building practices. We take pride in offering solutions that benefit both your home and the planet.
The production of cellulose insulation involves lower embodied energy less energy used during manufacturing—than fiberglass. Many of our cellulose products are sourced and processed locally in New England, reducing transportation emissions and supporting regional economies.
Beyond performance, installation can affect cost, timelines, and success.
For retrofits, cellulose can be dense-packed into existing wall cavities with minimal disruption. We’ve upgraded countless homes by drilling small access holes, filling cavities, and patching up cleanly. No need to tear down drywall.
Fiberglass, on the other hand, often requires full wall access or removal making it less practical for existing homes.
Installing dense pack cellulose takes precision. Our team is trained in best practices for cavity preparation, filling techniques, and quality checks. Poor installation can undermine any insulation’s effectiveness but when done right, cellulose consistently outperforms.
We’ve even been called in to fix botched cellulose jobs. The difference? We don’t cut corners. We take our time to ensure every cavity is densely and evenly filled.
Price matters but so does value. When you look beyond upfront costs, cellulose often comes out ahead.
Fiberglass may cost less upfront. But cellulose’s improved air sealing and thermal performance mean lower heating and cooling bills year after year. Over time, the savings can surpass the original cost difference.
We’ve worked with clients who recouped their investment within two heating seasons. That’s money back in your pocket plus improved comfort.
Mass Save and other local programs often offer incentives for high-performance insulation upgrades. Dense pack cellulose usually qualifies, thanks to its air sealing benefits and energy performance. We help clients navigate available rebates and maximize their savings.
Dense pack cellulose offers real-world advantages that fiberglass simply can’t match—from better thermal performance to sustainability, soundproofing, and air quality. At Lamothe Insulation & Contracting, we’ve seen the difference it makes in home after home.
If you’re ready to upgrade, we’re here to help. Call (508) 847-0119 or email [email protected] to schedule your assessment. Let’s make your home warmer, quieter, and more efficient—starting today.
Yes. Dense pack cellulose provides better air sealing, reducing drafts and heat loss. This is especially beneficial during New England winters.
Not when installed properly. Our dense pack method ensures a tight fill that maintains its shape and performance for decades.
We don’t recommend it. Dense packing requires professional equipment and skill to avoid underfilling or damaging the structure.
Absolutely. It’s treated with non-toxic borates that protect against mold, fire, and pests.
Positively. It’s free of formaldehyde and other volatile compounds often found in fiberglass. Our clients frequently notice fewer allergy symptoms after switching.
Yes. It significantly reduces sound transmission, making your home quieter and more peaceful.
Most retrofit jobs take 1-2 days, depending on the size of your home and access points.
Insulation upgrades are a strong selling point. Buyers appreciate the energy efficiency, comfort, and green materials.
It meets Class 1 fire rating standards. The borate treatment helps resist ignition and slow fire spread.
Contact us at (508) 847-0119 or [email protected]. We’ll assess your home and provide a clear, detailed plan.