The most R-value per dollar in open attics
Blown-In Insulation in Green Bay, WI
Cellulose or fiberglass blown to depth over a sealed ceiling, or dense-packed into old walls.
- Free on-site estimates
- Written quote showing foam type, depth and R-value
- Moisture, roof leaks and old insulation checked first
When Loose Fill Is the Smart Choice
Blown-in insulation is loose cellulose or fiberglass pumped through a hose into an attic or a wall cavity. Across an open attic floor it is usually the most affordable way to reach a high R-value, because it fills around trusses, wires and pipes without cutting and fitting. In older Green Bay homes it is also the way to fill walls that were built with nothing in them, without tearing off the siding or plaster.
Cellulose and fiberglass
HomeGuide rates loose cellulose at R-3.1 to R-3.8 per inch and blown fiberglass at R-2.2 to R-2.9. Cellulose is denser and resists air movement a little better; fiberglass is lighter and does not absorb water. Both work well when installed to the right depth over a sealed ceiling.
Dense-pack walls
For closed walls, we drill small holes, usually from outside behind a course of siding or from inside, and blow cellulose in at high density so it fills the cavity and does not settle. We check for knob-and-tube wiring first, because it should not be buried.
Air sealing comes with it
Loose fill does not stop air on its own. Before we blow an attic, we seal the bypasses through the ceiling, put up baffles at the eaves and insulate the hatch. That is listed on the quote so you know it is part of the work.
Blown-In Work We Do
Attics, walls and the sealing that goes with them.
Attic top-ups
Adding loose fill over existing insulation to reach the target depth.
Dense-pack walls
Cellulose blown into closed walls through small holes, then patched.
Floors over unheated spaces
Fill in floor framing where netting or board can hold it.
Air sealing and baffles
Bypasses sealed and eave vents protected before the fill goes in.
Published Blown-In Insulation Costs
| Job | Range and source |
|---|---|
| Blown-in, per sq ft | $1.00 to $2.80 (HomeGuide); $1.65 to $3.80 (Fixr) |
| Attic | $900 to $3,600 (HomeGuide); $1,750 to $5,500 for about 1,500 sq ft (Fixr) |
| Exterior walls | $1,900 to $7,800, $1.10 to $3.70 per sq ft (HomeGuide); $2,000 to $4,000 (Fixr) |
| Dense-pack cellulose | $1.60 to $4.20 per sq ft (HomeGuide) |
| Fiberglass / cellulose | $1.65 to $2.60 / $1.75 to $3.80 per sq ft (Fixr) |
| Typical job | $800 to $3,000 (HomeGuide); $3,000 to $7,000 (Fixr) |
HomeGuide (November 2025) and Fixr (August 2025) supply these national ranges. Depth, attic access, how much sealing is needed and any removal change what you pay. After the visit you get a written estimate, and that figure is the price.
How Blown-In Work Goes
1. Inspect
We measure what is there, check the wiring and look for leaks and venting issues.
2. Quote
Depth, R-value, sealing and any patching listed in writing.
3. Seal and prep
Bypasses sealed, baffles set and depth markers placed.
4. Blow and check
Fill goes in level to the marked depth, and walls are checked for full coverage.
Why Choose Us for Blown-In Insulation
Sealed first
We do not blow fill over open bypasses.
Wiring checked
Old wiring is identified before any wall gets filled.
Depth markers
You can see the finished depth in the attic.
Blown-In Insulation Questions
How much does blown-in insulation cost?
HomeGuide lists blown-in at $1.00 to $2.80 per square foot, and an attic at $900 to $3,600. Fixr's attic range for about 1,500 square feet is $1,750 to $5,500. We give you a written price after measuring.
Does blown-in insulation settle?
Loose fill settles a little over time, which is why we blow to the settled depth for the target R-value. Dense-packed walls are installed tight enough to resist settling.
Can you blow insulation into plaster walls?
Yes. We drill small holes, fill each cavity and patch. We check for wiring and fire blocking first.
Is blown-in cheaper than spray foam?
Per square foot, yes. Foam earns its cost in rim joists, walls and tight spaces where air sealing matters most.
Blown-In Insulation Service Areas
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Get a Blown-In Insulation Estimate
Ask us how much depth your attic is missing.