Open-cell vs closed-cell spray foam cost?

Open-cell is usually $1.50–$3/sq ft; closed-cell $3–$7+. Closed-cell has higher R-value per inch and can act as a vapor barrier.

What is the R-value of spray foam?

Open-cell about R-3.5–R-3.8 per inch; closed-cell about R-6–R-7 per inch. Thickness determines total R-value.

How long does spray foam insulation last?

Spray foam can last 80+ years when properly installed. It does not settle and maintains R-value over time.

Is spray foam insulation worth the cost?

It can be worth it for air sealing and high R-value in one step. Best for new construction or major retrofits where air leakage is a concern.

How much does spray foam cost for a 1000 sq ft attic?

1,000 sq ft attic with spray foam often $3,000–$7,000+ depending on open vs closed cell and thickness.

Can spray foam be installed in existing walls?

Yes. Injection foam can be installed through small holes in existing walls. Cost is typically $5–$8+ per sq ft.

Does spray foam need a vapor barrier?

Closed-cell spray foam can act as a vapor barrier at sufficient thickness. Open-cell usually needs a separate vapor retarder in cold climates.

How do I get the best spray foam quote?

Get 2–3 quotes from licensed installers. Specify open vs closed cell, area, and target R-value. Ask about warranty.

What is the cost per inch of spray foam?

Roughly $0.75–$2+ per sq ft per inch for closed-cell; less for open-cell. Total cost depends on thickness and area.

Is spray foam safe after installation?

Once fully cured, spray foam is generally considered safe. Installers should follow proper ventilation during and after application.

Can I install spray foam myself?

DIY kits exist but professional installation is recommended for proper coverage, thickness, and safety. Pros have better equipment.

How much does spray foam reduce energy bills?

Spray foam can reduce heating and cooling costs 20–50% when it replaces poor or no insulation and seals air leaks.

What is the lifespan of spray foam?

Spray foam typically lasts 80+ years. It does not sag or settle like some other insulation types.

Spray foam for crawl space cost?

Crawl space spray foam typically $3–$6+ per sq ft. Closed-cell is common for moisture resistance and R-value.

Spray Foam Insulation Cost Calculator

Q: How much does spray foam insulation cost?

Spray foam insulation in the U.S. typically costs $1.50–$7+ per sq ft: open-cell $1.50–$3, closed-cell $3–$7+. Thickness and R-value drive the total.

Use this free spray foam insulation cost calculator to estimate cost by type (open-cell, closed-cell), R-value, and area. Most projects run $1.50–$7+ per sq ft. Get a low, average, and high estimate below.

How much does spray foam insulation cost?

Spray foam insulation typically costs $1.50–$7+ per sq ft: open-cell $1.50–$3, closed-cell $3–$7+. Get 2–3 local quotes.

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How to read this estimate

These figures are based on national average material and labor costs adjusted for the options you selected. Actual pricing varies with your local market, site conditions, material availability and contractor workload. Always get two or three written quotes before committing to a project.

Average Spray Foam Insulation Cost

National averages run $1.50–$7+ per sq ft. Final cost depends on open vs closed cell and thickness.

Cost by type (per sq ft)

Typical ranges

Type	Estimated cost
Open-cell	$1.50–$3
Closed-cell	$3–$7+

Cost factors

What drives the total

Factor	Impact
Closed-cell vs open-cell	Closed-cell often 2x cost
Thickness / R-value	More inches add cost

What Affects Spray Foam Insulation Cost?

Type — Closed-cell costs more but provides higher R-value and can act as a vapor barrier.
Thickness — More inches increase material and labor cost.
Area — Larger projects may get a better per-sq-ft rate.
Location — Labor and material prices vary by region.

Data from contractor quotes

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Disclaimer: Estimates are for planning only. Actual costs depend on product and local rates. Get 2–3 written quotes.