Yes, you can add cellulose insulation over fiberglass—and it’s one of the smartest ways to boost your home’s comfort and efficiency before winter. The key is proper air sealing and ensuring the fiberglass layer is dry and evenly distributed. When installed correctly, blown-in cellulose fills gaps, reduces drafts, and helps lock in heat where fiberglass alone falls short.
Why Homeowners Choose to Add Cellulose Insulation Over Fiberglass
If your home feels drafty or your energy bills keep climbing, your existing fiberglass insulation may not be doing its job anymore. Over time, fiberglass batts settle, sag, or lose R-value, especially in attics exposed to temperature swings and moisture.
By adding a layer of dense-pack cellulose, you can:
Increase your attic’s overall R-value and meet today’s energy-efficiency standards.
Seal tiny air leaks that fiberglass alone can’t block.
Improve indoor comfort by evening out hot and cold spots.
Lower heating and cooling costs year-round.
It’s one of the simplest and most cost-effective upgrades for older homes in New Jersey and Westchester County, NY.
How the Process Works
At Metro NY Insulation, our BPI-certified technicians follow a proven method:
Inspect the existing insulation. We check for damp or compressed fiberglass and ensure it’s dry and safe to cover.
Air-seal key points like light fixtures, attic hatches, and rim joists to stop air movement before adding new insulation.
Blow in cellulose insulation across the entire attic floor, evenly covering the fiberglass layer.
Verify R-value and depth using professional gauges so your home meets or exceeds local code requirements.
This approach not only restores performance but also qualifies many homeowners for state energy rebates.
Energy Rebates and Incentives
Metro NY Insulation participates in the NYSERDA Home Performance program. Depending on your home’s size and income tier, you could save up to $6,200 through combined state and federal incentives when upgrading your attic insulation.
💡 We’ll guide you through the paperwork and make the process hassle-free.
Contact Our Insulation Experts
Why Cellulose Outperforms Fiberglass Alone
Higher R-value per inch: Cellulose provides up to R-3.8 per inch versus fiberglass at roughly R-2.5.
Better air sealing: Dense fibers reduce airflow and drafts.
Eco-friendly: Made from recycled paper and treated with safe borate fire retardants.
Quieter: Helps absorb sound between rooms and from outside noise.
In older homes, adding cellulose over fiberglass is like wrapping your house in a cozy blanket—warmer in winter, cooler in summer, and far more efficient.
When Replacement Might Be Better
If your fiberglass insulation is wet, moldy, or damaged, replacement is the safer option. Wet insulation loses effectiveness and can trap moisture. In those cases, our team can remove the old material and install a fresh layer of blown-in cellulose or spray foam.
FAQ's
Only if it’s wet, dirty, or damaged. Otherwise, cellulose can be safely installed on top.
Most attics in our region perform best with R-49 to R-60, which usually means about 14–16 inches total insulation depth.
No—our technicians maintain proper airflow with baffles and vent chutes during installation.
Most attic upgrades are completed in a single day.
Trusted by Homeowners Since 2005
At Metro NY Insulation, we’re woman-owned, family-run, and BPI-Accredited—serving homeowners with expert insulation services throughout:
New Jersey: Bergen, Essex, Passaic, Hudson Counties
New York: Sullivan, Dutchess, Ulster, Orange, Westchester, Rockland Counties
Let’s make your home warmer, more efficient, and ready for the colder months ahead.
📞 Call 845-445-8255 or schedule your insulation assessment today.