Spray Foam Insulation Cost in Ohio
Calculate instant estimates for your insulation project in Ohio.Ohio is in Climate Zone 5. We recommend R-20 for walls and R-49 for attics.
Spray area
1,364 sq ft
Rises 7 ft to the ridge · roof is 12% larger than its footprint
Spray foam in Ohio: climate zone 5, R-value and cost
Ohio is in IECC climate zone 5 (Zone 5 (Cold)). Our guide targets R-20 for walls and R-49 for attics. The table shows how much foam that takes and what 1,000 sq ft would cost at our national planning prices.
| Area | Target | Open-cell (R-3.7/in) | Closed-cell (R-6.5/in) |
|---|---|---|---|
| Attic | R-49 | 13.5 in (above the 8 in the calculator allows)$7,128–$16,038 · typical $11,583 | 8 in$10,120–$24,640 · typical $17,424 |
| Walls | R-20 | 5.5 in$2,904–$6,534 · typical $4,719 | 3.5 in$4,428–$10,780 · typical $7,623 |
Costs are installed planning ranges including a 10% waste allowance. They are national, not Ohio-specific; local labor and demand vary. Method and sources: methodology.
What climate zone is Ohio in for spray foam insulation?
Ohio is in IECC climate zone 5 (Zone 5 (Cold)). Our guide targets R-20 for walls and R-49 for attics in this zone.
How thick should spray foam be in a Ohio attic?
To reach R-49, an attic needs about 8 inches of closed-cell foam (roughly R-6.5 per inch) or 13.5 inches of open-cell foam (roughly R-3.7 per inch).
How much does spray foam insulation cost in Ohio?
Our national planning range is $0.48–$1.08 per board foot for open-cell and $1.15–$2.80 for closed-cell, installed. Installers typically charge a $1,000–$2,000 minimum per job. For a 1,000 sq ft attic at R-49, that is about $10,120–$24,640 in closed-cell foam. We do not have Ohio-specific installer pricing, so get local written quotes.
Frequently Asked Questions
How much does spray foam insulation cost per square foot in 2026?
The cost depends on the type of foam and thickness.
- Open Cell Foam: Costs between $0.48 and $1.08 per board foot. For a standard 2x4 wall (3.5 inches thick), this equates to roughly $1.68 - $3.78 per square foot.
- Closed Cell Foam: Costs between $1.15 and $2.80 per board foot. For a 2-inch layer on a wall, expect to pay $2.30 - $5.60 per square foot.
Note: Professional contractors often have a minimum job charge of $1,000 - $2,000.
What is a "Board Foot" and how do I calculate it?
A "Board Foot" is the industry standard unit for measuring spray foam volume. It represents a volume of 1 foot x 1 foot x 1 inch thick.
To calculate it, multiply your total square footage by the thickness in inches. For example, 1,000 sq. ft. sprayed at 2 inches thick equals 2,000 board feet. Our calculator automatically handles this conversion for you.
What is the difference between Open Cell and Closed Cell spray foam?
The main differences are density, R-value, and moisture resistance:
- Open Cell: Light and sponge-like. It's cheaper and great for soundproofing interior walls, but it is not waterproof and has a lower R-value (~R-3.7/inch).
- Closed Cell: Dense and rigid. It acts as a vapor barrier (waterproof), adds structural strength, and has a very high R-value (~R-6.5/inch). It is ideal for basements, roofs, and exterior walls.
What thickness of spray foam do I need?
It depends on your local climate (Climate Zone) and building code:
- Walls (2x4): Typically need 3.5" of Open Cell or 2.0" of Closed Cell to meet R-13 standards.
- Attics/Roofs: Typically need 6" to 10" of Open Cell or 4" to 6" of Closed Cell to meet R-38 to R-49 standards.
Tip: Closed cell foam provides a higher R-value per inch, making it better for shallow wall cavities.
Is it cheaper to DIY spray foam insulation or hire a pro?
For small projects (under 600 board feet), such as a "Rim Joist" or a small van conversion, DIY kits (like Froth-Pak) are cheaper and convenient.
However, for large projects like a whole house or attic, hiring a professional is often cheaper. Contractors buy materials in bulk at a fraction of the cost of DIY kits. Plus, professionals have better equipment to ensure the foam expands correctly and safely.
How can I tell if a contractor quote is too high?
Compare the quote against the total board feet, foam type, thickness, prep work, cleanup, and minimum job charge. A high quote may be reasonable if it includes old insulation removal, difficult access, ignition barrier coating, or multiple trips.
Use the quote checker in the calculator results to compare a contractor's price against the estimated range.
Does spray foam insulation really save money on energy bills?
Yes. According to the U.S. Department of Energy, proper air sealing and insulation can save homeowners 15% to 50% on heating and cooling costs. Spray foam is unique because it insulates and seals air leaks simultaneously, making it more effective than fiberglass batts in reducing energy loss.