Blown-In Cellulose Insulation
Recycled paper fiber, borate-treated, blown in dense and fast. The most eco-friendly insulation we install — and the only practical way to insulate existing wall cavities without tearing them open.
When Cellulose Wins
Attic top-ups
Add R-value on top of existing insulation, fast. Blows in dust-free with our equipment.
Dense-pack walls
Fill existing wall cavities without a gut renovation — bore, pack, patch.
Interior sound walls
The quietest residential insulation we install — perfect for bedrooms, offices, and media rooms.
Green builds
85% recycled content. The choice when low embodied carbon matters to you or your project.
85%
Recycled content
Mostly post-consumer newsprint, manufactured close to point of use.
R-3.7
Per inch
Comparable to fiberglass on paper — but seals around obstructions far better.
Class A
Fire rating
Borate treatment makes it fire-, mold-, and pest-resistant.
Cellulose Insulation FAQs
What exactly is cellulose insulation?
Dense paper fiber (mostly post-consumer recycled newsprint) treated with borate for fire, mold, and pest resistance. It blows into attics as loose-fill or dense-packs into wall cavities. R-value is roughly R-3.7 per inch — about the same as fiberglass — but the way it fills cavities, including around wires and odd framing, is far better.
Cellulose vs. fiberglass — which should I pick?
For attic top-ups they're close, but cellulose hits its rated R-value in cold weather better (fiberglass loses performance below 20°F if poorly installed), fills gaps tighter, and reduces sound transfer noticeably. For existing wall cavities, dense-pack cellulose is the clear winner — it's the only loose-fill that resists settling.
Will cellulose burn?
No. Borate treatment makes treated cellulose a Class A fire-resistant material — it actually delays flame spread through a wall assembly. It's been used in homes for 70+ years for exactly this reason.
Can you dense-pack the walls of my existing house without tearing them open?
Yes — that's its superpower. We bore small access holes from the exterior or interior, dense-pack each cavity to about 3.5 lb/ft³ so it never settles, and patch the holes. Best retrofit option for plaster or drywall walls without a gut renovation.
Is cellulose actually eco-friendly?
It's the lowest-embodied-carbon insulation we install. ~85% recycled content, manufactured close to point of use, and it sequesters the carbon in the paper itself. Most jobs qualify for the same LPEA, Colorado HEAR, and federal 25C rebates as any other insulation upgrade.
Top Up Your Attic. Dense-Pack Your Walls.
Free assessment. We'll measure existing depth, identify where cellulose makes sense, and quote it against the alternatives so you can choose with confidence.