Attic Spray Foam Insulation Cost (2026): A Complete Price Guide
Category: Cost Guides / Attics
If your home feels drafty or your upper floors are scorching in the summer, the culprit is almost always your attic. In 2026, attic spray foam insulation remains the gold standard for creating a high-performance thermal envelope.
But what does it actually cost this year?
2026 Attic Insulation Price Table
Pricing depends on whether you are spraying the Attic Floor (vented) or the Roof Deck (unvented/conditioned).
| Attic Application | Recommended Foam | 2026 Avg. Cost (per Sq Ft) | | :--- | :--- | :--- | | Attic Floor (Flat) | Open Cell (10" / R-38) | $5.50 - $8.50 | | Roof Deck (Sloped) | Open Cell (6" / R-22) | $3.30 - $5.10 | | Roof Deck (Premium) | Closed Cell (3" / R-21) | $3.75 - $6.30 |
Note: Prices above represent surface area square footage with specified thickness.
Why Spray Foam for Attics?
In 2026, building codes are stricter than ever. Traditional fiberglass batts often fail to meet the airtightness standards required for modern energy efficiency ratings.
- Stop "The Stack Effect": Warm air rises and escapes through your attic. Spray foam seals those gaps permanently.
- Conditioned Space: By spraying the roof deck, you turn your attic into a conditioned space, protecting your HVAC equipment and ductwork from extreme temperatures.
- Prevent Ice Dams: For northern climates, attic foam is the #1 defense against costly ice dam damage.
Key Factors Influencing Attic Quotes in 2026
- Old Insulation Removal: Expect to pay $1.50 - $2.50 per sq ft to vacuum out old fiberglass or cellulose.
- Accessibility: "Low-pitch" attics where the installer has to crawl on their stomach increase labor costs.
- Intumescent Coating: Many local codes in 2026 require a fire-retardant ignition barrier over the foam, adding $0.50 - $0.80 per sq ft.
ROI: How Soon Does It Pay For Itself?
With energy rates rising in 2026, most homeowners report a 15% to 30% reduction in monthly heating and cooling costs. For most projects, the insulation pays for itself within 5 to 7 years.
Don't overpay for your attic project. Get a breakdown based on your specific roof pitch and square footage.