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Cellulose vs Fiberglass

Cellulose vs Fiberglass

The choice between cellulose and fiberglass loose fill insulation depends on whether you prioritize maximum thermal efficiency and air sealing (cellulose) or moisture resistance and long-term stability (fiberglass). 

Attic filled with thick, light-colored insulation; sunlight streams through a small window.

Loose Fill Fiberglass Insulation

Person in protective suit blowing insulation into an attic.

Loose Fill Cellulose Insulation

Core Performance Comparison

Feature Cellulose (Blown-In) Fiberglass (Blown-In)
Air Sealing Superior; fills small gaps Poor; allows air movement
Settling Rate High (~20% over time) Minimal (typically <2%)
Soundproofing Excellent (denser matrix) Moderate
Fire Safety Class A (treated with borates) Class A (naturally non-combustible)

Key Strengths

Cellulose

  • Air Sealing: It is approximately 35–40% more effective at reducing air infiltration than fiberglass.
  • Sustainability: Made from up to 85% recycled paper (primarily newspaper and cardboard).
  • Extreme Temperatures: Unlike fiberglass, which can lose significant R-value in extreme cold, cellulose maintains or even slightly improves its thermal resistance as temperatures drop.
  • Pest Resistance: Treated with borates, which naturally repel insects and rodents.

Fiberglass

  • Stability: It maintains its original thickness for decades, whereas cellulose can lose 15–25% of its R-value over its lifespan due to settling.
  • Moisture Resistance: Fiberglass is non-absorbent and does not rot or support mold growth on its own, making it better for high-humidity areas.

Take Action Today

Ready to upgrade your home's efficiency? Insulation Station provides professional insulation services for your whole home. We can help you stop cold/hot rooms and reduce your utility bills. Book now for a free whole home inspection and start enjoying every room in your home. 

Work With Us

Looking for steady, hands-on work with a trusted local company? Join Insulation Station!

We have three positions available for immediate hire. We have a positive and encouraging work environment where laughter and smiles rule the day. If you’re hardworking, reliable, and ready to learn, we’d love to have you on our team.


Sales Support

Work with prospective customers that are requesting insulation services. Provide free inspections at customer's homes and deliver estimate of cost to customer for approval. Requires a clean driving record. Uniforms and tools provided.


Located in Broomfield, CO
100% commission
Income range is $4,000-$8,000/month
Contract only - no benefits


Installer

Install insulation products in customers’ attics, walls, basements, and crawlspaces. Safety equipment and uniforms provided. Clean driving record requires. No experience necessary. Insulation Station will train you and pay for you to obtain a BP-AT certification.


Located in Broomfield, CO
Income range is $6,000-$8,000/month
Contract only - no benefits


Lead Installer

Install insulation products in customers’ attics, walls, basements, and crawlspaces. Safety equipment and uniforms provided. Clean driving record requires. Lead Installer drives the work truck and supervises junior contract installers. Insulation Station will train you and pay for you to obtain a BP-AT certification.


Located in Broomfield, CO
Income range is $6,000-$10,000/month
Contract to permanent employment after 90 days.
Benefits provided for permanent employees.

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