Fiberglass in Attics

Why Fiberglass Insulation Is Not Ideal in Attics

1. Air Leakage
   Fiberglass does not stop air movement. In attics, where airflow is common, this drastically reduces its effectiveness.

2. Poor Performance When Cold
   Fiberglass loses much of its insulating value in cold weather, just when you need it most.

3. Moisture Retention
   It absorbs moisture from humidity or roof leaks, which reduces R-value, promotes mold growth, and can damage wood structures.

4. Rodent & Pest Nesting
   Mice and other pests often nest in fiberglass, damaging the material and contaminating it with droppings and urine.

5. Compression & Settling
   Over time, fiberglass gets compressed or shifts, especially when walked on or moved for repairs, which reduces its thermal performance.

Why It Should Be Removed

• It’s often contaminated with dust, droppings, mold spores, and insulation debris.

• It no longer performs as intended.

• Removal allows for air sealing and the installation of modern, high-performance insulation materials.

Benefits of High-Quality Cellulose Insulation

1. Air Sealing Capability
   Dense-packed cellulose resists air movement far better than fiberglass, helping maintain indoor comfort.

2. Superior Thermal Performance
   It performs consistently across seasons and fills gaps and odd-shaped cavities more effectively.

3. Fire & Pest Resistance
   Treated with borate, cellulose is naturally fire-resistant and discourages pests.

4. Sound Dampening
   Its density significantly reduces noise transmission from outside or between rooms.

5. Eco-Friendly
   Made from recycled paper, cellulose is a sustainable, low-carbon-footprint option.

6. Improved Home Comfort & Energy Savings
   When paired with attic air sealing, cellulose insulation helps homes stay warmer in the winter and cooler in the summer, reducing HVAC strain and energy bills.