What blown-in attic insulation means
Blown-in attic insulation is loose fiberglass or cellulose blown across the attic floor to a set depth to reach a target R-value.
Also called loose fill insulation.
Where it matters on a insulation job
It is the most common insulation sale. Mark the depth with rulers before you blow, staple the bag count and R-value card near the hatch, and photograph both for the customer and any rebate program.
The numbers, with sources
- ENERGY STAR says R-value is a measure of insulation's ability to resist heat traveling through it; the higher the R-value, the better the thermal performance. (ENERGY STAR)
What it costs
The blown-in insulation cost guide has the typical job at $1,650 and the usual range at $990 to $2,350. The guide shows its sources and what moves the price. The insulation cost calculator prices a job line by line.
Work it out
- Free calculator: Insulation cost calculator
- Cost guide: Blown-in insulation cost
- Tools, templates and guides: Free insulation resources
Sources: ENERGY STAR, Recommended home insulation R-values. Checked October 9, 2026.