Blown Insulation Cost Calculator
Price a practical attic insulation upgrade with depth and material choices, while keeping air sealing and ventilation baffles visible in the result.
Your project
Attic floor area (sq ft)iAttic floor area (sq ft) Enter the measurable sq ft receiving this work. | |
|---|---|
R-value targetiR-value target Higher targets use more material and installation time. | |
Blown materialiBlown material Cellulose is denser and often carries a modest installed premium. | |
Your stateiYour state Scales U.S.-average labor and material midpoints for typical state-level pricing. It is not an on-site bid. |
How to use this calculator
- Enter the attic floor area (sq ft).
- Select the material and finish choices.
- Toggle the optional work that applies.
- Choose your state and review each line.
Results explained
The calculator separates the primary installed material from the selected finish and optional scope so you can compare contractor proposals component by component.
Quick reference: blown insulation midpoints
Installed U.S.-average midpoints before the selected state adjustment.
| Scope | Midpoint |
|---|---|
| R-38 fiberglass | $1.35/sq ft |
| R-49 fiberglass | $1.75/sq ft |
| Cellulose premium | +$0.28/sq ft |
| Air sealing | +$0.75/sq ft |
Rates are planning midpoints; difficult access, repairs, and minimum job charges can shift quotes.
How the estimate is built
R-value rate plus material adjustment and selected attic upgrades are multiplied by area, then state scaled.
Example scenario
A 1,200 sq ft R-49 fiberglass attic with air sealing is roughly $3,000 before state scaling.
FAQ
Should old insulation come out?
Only if it is wet, contaminated, or prevents air-sealing work; removal is outside this model.
Do I need a vapor barrier?
Attic assemblies vary by climate and ceiling construction; confirm with a local insulation professional.
Can I add more on top?
Often yes, provided moisture and ventilation conditions are correct.