The Benefits of Cellulose Retro Insulation
- Miclan Kerr

- Jan 19
- 3 min read
Updated: Feb 2
Why Choose Cellulose for Retro Insulation?
Cellulose insulation is made from recycled paper treated with fire retardants. It is a sustainable option that offers several benefits for retrofit projects:
Superior air sealing: When densely packed, cellulose fills gaps and cracks better than fiberglass batts, reducing drafts and heat loss.
Better noise reduction: Cellulose’s dense nature absorbs sound waves, making rooms quieter and more comfortable.
Eco-friendly: Made mostly from recycled materials, cellulose has a lower environmental impact.
Moisture control: Cellulose can help regulate humidity by absorbing and releasing moisture, reducing the risk of mold.
Cost-effective: It often costs less than spray foam and can be installed without major demolition.
These benefits make cellulose an excellent choice when you want to improve insulation without major renovations.
How Drill and Fill Insulation Works
Drill and fill is a retrofit technique that allows you to add cellulose insulation inside wall cavities without removing drywall. Here is how it works:
Locate wall cavities: Professionals identify the spaces between studs where insulation will be added.
Drill small holes: Holes about 2 to 4 inches in diameter are drilled into the drywall, usually near the top or bottom of the wall.
Blow in cellulose: Using specialized equipment, cellulose is blown into the cavity through the holes, filling the space completely.
Seal holes: After filling, the holes are patched and painted to match the wall.
This method keeps your drywall intact, minimizing mess and disruption. It is especially useful in older homes where removing drywall would be costly or damaging.
Advantages of Dense-Packed Cellulose Over Fiberglass
Fiberglass insulation has been a popular choice for decades, but dense-packed cellulose offers clear advantages in retrofit applications:
Better air sealing: Fiberglass batts often leave gaps and compress over time, allowing air leaks. Dense-packed cellulose fills cavities tightly, blocking airflow.
Improved thermal performance: Because it reduces air movement, cellulose maintains consistent temperatures better than fiberglass.
Enhanced soundproofing: The density of cellulose absorbs more sound, reducing noise transfer between rooms or from outside.
Long-lasting: Cellulose settles less than fiberglass, maintaining its insulating properties for years.
Fire resistance: Treated cellulose resists fire better than untreated fiberglass.
For retrofit projects, these factors mean you get more comfort and energy savings with cellulose.

Practical Tips for Your Retro Insulation Project
If you are considering retro insulation with cellulose, keep these points in mind:
Hire experienced installers: Proper dense packing is key to performance. Professionals know how to avoid voids and ensure even coverage.
Check for moisture issues first: Address any leaks or dampness before insulating to prevent mold growth.
Consider air sealing upgrades: Adding weatherstripping or sealing around windows and doors complements the insulation.
Plan for electrical and plumbing: Inform your installer about known wires and pipes to avoid damage during drilling.
Evaluate your walls: Some walls may have existing insulation or obstructions that affect the process.
By preparing carefully, you will get the best results from your retrofit insulation.
How Retro Insulation Saves Money and Energy
Adding cellulose insulation with drill and fill can reduce your heating and cooling bills significantly. Studies show that air leaks account for up to 30% of energy loss in homes. Dense-packed cellulose cuts these leaks, keeping warm or cool air inside.
For landlords, improved insulation means happier tenants and potentially higher property value. For homeowners, it means more comfort year-round and lower utility costs.
Final Thoughts on Cellulose Retro Insulation
Choosing cellulose for your retrofit insulation project offers clear benefits: excellent air sealing, noise reduction, sustainability, and cost savings. The drill and fill technique allows you to upgrade your walls without tearing down drywall, making the process cleaner and faster.
In summary, cellulose insulation is a practical choice for enhancing energy efficiency in your home. It provides a sustainable solution that meets your needs while ensuring comfort and cost savings. By investing in cellulose insulation, you are making a wise decision for your property.
For more information on insulation options, please visit Priority North Insulation.




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