Open-Cell vs Closed-Cell Spray Foam: What’s the Difference and Which Is Right for Your Home?

Spray foam insulation is one of the most effective ways to improve energy efficiency, comfort, and air sealing in a home. But not all spray foam is the same. Homeowners in Dallas–Fort Worth often ask the same question:

What’s the difference between open-cell vs closed-cell spray foam, and which one should I choose?

The answer depends on your home’s structure, budget, and performance goals. Here’s a clear breakdown to help you make an informed decision.

What Is Spray Foam Insulation?

Spray foam insulation is a liquid applied material that expands on contact, filling gaps, cracks, and cavities. Once cured, it forms an air tight seal that helps reduce energy loss, control moisture, and improve indoor comfort.

There are two main types:

• Open-cell spray foam

• Closed-cell spray foam

While they may look similar during installation, their performance and applications are very different.

Open-Cell Spray Foam Explained

Open-cell spray foam is a lighter, softer material with a spongy texture. Its internal cells remain open, which allows air and moisture vapor to pass through.

Key Characteristics of Open-Cell Spray Foam

• Density: Low (about 0.5 lb per cubic foot)

• R-Value: ~R-3.5 to R-3.7 per inch

• Texture: Soft and flexible

• Expansion: Expands significantly, filling large cavities easily

Benefits of Open-Cell Spray Foam

• Excellent air sealing

• Helps reduce outside noise

• More cost-effective than closed-cell

• Easier to cut, remove, or modify if future electrical or plumbing work is needed

Best Uses in Dallas Homes

• Attic roof decks

• Interior walls

• Soundproofing applications

• Homes where breathability is preferred

Open-cell spray foam is commonly used in North Texas attics, especially when homeowners want strong performance without the higher cost of closed-cell.

Closed-Cell Spray Foam Explained

Closed-cell spray foam is much denser and more rigid. Its cells are completely sealed, making it both an air barrier and a moisture barrier.

Key Characteristics of Closed-Cell Spray Foam

• Density: High (about 2 lb per cubic foot)

• R-Value: ~R-6 to R-7 per inch

• Texture: Hard and rigid

• Expansion: Expands less, but adds structural strength

Benefits of Closed-Cell Spray Foam

• Higher R-value per inch

• Acts as a vapor barrier

• Adds structural rigidity to walls and roofs

• Performs well in high moisture environments

Best Uses in Dallas–Fort Worth

• Exterior walls with limited cavity space

• Metal buildings

• Crawl spaces

• Areas exposed to moisture or wind-driven rain

Closed-cell spray foam is often chosen when maximum insulation value and moisture control are priorities.

Open-Cell vs Closed-Cell: Side-by-Side Comparison

Which Spray Foam Is Better for Dallas Homes?

There’s no one-size-fits-all answer. In Dallas–Fort Worth’s hot climate, both products perform well when installed correctly.

• Choose open-cell if you want a cost-effective solution for attics, sound control, and flexibility for future renovations.

• Choose closed-cell if you need higher R-values in tight spaces, moisture resistance, or added structural strength.

A professional inspection is the best way to determine which option fits your home’s layout and performance goals.

Professional Spray Foam Installation Matters

Spray foam performance depends heavily on proper installation. Incorrect depth, poor surface preparation, or improper mixing can reduce effectiveness and create long-term issues.

At AtticProsTX, our veteran-owned team installs both open-cell and closed-cell spray foam across Dallas–Fort Worth. We evaluate your attic, walls, and building envelope to recommend the right solution, not a one-size-fits-all approach.

Schedule a Spray Foam Evaluation

If you’re considering spray foam insulation or comparing options for your home or business, a professional assessment can save you money and headaches down the road.

Contact AtticProsTX today to schedule a free inspection and find out which spray foam insulation is right for your Dallas-area property.