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Attic Insulation Cost Estimator
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Attic Insulation Cost
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Attic insulation costs $2 to $6 per square foot installed, depending on the type, R-value, job size, and complexity. The average cost to insulate an attic is $1,500 to $3,200. Small attic insulation costs start at $700, while insulating large attics costs up to $6,500.
Spray foam offers the best attic insulation performance available. Choose from two types: closed-cell and open-cell, aka 2-pound and ½-pound, respectively. They sport insulation values of approximately R-6.5 and R-3.6 per inch, respectively.
For attic projects, calculate spray foam insulation costs using our specialized tool.
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Frequently Asked Questions ( FAQs)
The recommended level for most attics is to insulate to R-38 or about 10 to 14 inches, depending on insulation type.
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Real Wool, Mineral Wool, and Fiberglass Blown-In
Mineral wool and real wool blown-in are less common but are healthier choices.
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Expert contractors that specialize in insulation advise that removing old fiberglass insulation is best before installing new cellulose insulation because of possible mildew, mold, or rodent excrement.
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However, due to its construction with natural materials, eventually the product will lose effectiveness. Fiberglass insulation typically needs to be replaced 15-20 years into it’s life, as it can easily become dirty, wet, moldy, and ineffective if there’s a roof leak or water damage of any kind.
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Blown-in attic insulation cost
Blown-in insulation costs $960 to $3,800 on average or $0.96 to $2.90 per square foot, depending on the attic size, R-value, and the amount of fixture damming and air sealing needed. Blown-in attic insulation is ideal for most attics because it effectively fills gaps and irregularly shaped areas.
Attic spray foam insulation cost
Attic spray foam insulation costs $2.00 to $5.50 per square foot or $0.80 to $3.90 per board foot, depending on the type, R-value, and job size. Attic spray foam insulation costs $1,400 to $7,300 on average for the floor and $2,000 to $9,500 for the rafters and roof deck.
| Location | Average cost installed |
|---|---|
| Attic floor | $1,400 – $7,300 |
| Attic rafters/roof deck | $12,000 – $9,500 |
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Structural insulated panels prices (SIPs)
Structural insulated panels (SIPs) cost $6 to $14 per square foot for the material alone, depending on the thickness. SIPs are large panels – 4′ x 8′ up to 8′ x 24′ – primarily used in new construction but sometimes installed at the rafters when converting an attic to a conditioned space.
Loose-fill attic insulation cost
Loose-fill attic insulation costs $2.00 to $3.50 per square foot installed on average. Loose-fill insulation is the same material as blown-in, but the labor cost is slightly higher to install.
Loose-fill works best for:
Cost factors to install or replace attic insulation
Replacing attic insulation costs $3 to $8 per square foot, including $2 to $4 per square foot to remove the old insulation. Additional costs may be required for air sealing or encapsulating, cleaning, or making repairs in the attic:
Attic insulation removal cost
Attic insulation removal costs $2 to $4 per square foot on average, depending on the amount and type. Remove old insulation if it has fire, water, or pest damage or if the material is hazardous. Removing insulation also exposes the area to seal all penetrations.
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