What Is Spray Foam Insulation and How Does It Work?

Spray foam insulation is a high-performance material made from polyurethane that expands upon application to seal gaps, cracks, and cavities.
When sprayed onto a surface, it reacts chemically to expand up to 30 times its liquid volume — creating a dense, airtight barrier that prevents air leaks and moisture intrusion.

Unlike fiberglass batts or cellulose, spray foam forms a continuous seal that improves energy efficiency and reduces noise transmission.

💡 In simple terms: spray foam doesn’t just fill spaces — it locks in comfort and blocks out drafts.

Main Benefits of Spray Foam Insulation

1. Energy Efficiency

Closed-cell spray foam has one of the highest R-values per inch (6–7), making it an excellent choice for reducing heat loss in winter and keeping cool air inside during summer.

2. Air & Moisture Barrier

It prevents humidity and condensation from penetrating walls and ceilings, protecting your structure from mold and mildew growth.

3. Soundproofing

Besides thermal insulation, spray foam also reduces airborne sound, creating a quieter, more peaceful indoor environment.

4. Long Lifespan

Properly installed spray foam can last over 30 years without sagging or settling, offering a long-term insulation solution.

Explore our Spray Foam Collection →

Types of Spray Foam Insulation: Open Cell vs. Closed Cell

Not all spray foams are the same. The two main types differ in density, structure, and application areas:

👉 Read next: Open Cell vs Closed Cell Spray Foam — Which One Should You Choose?

Pro Tip: Closed-cell foam is ideal for energy retention and moisture resistance, while open-cell foam works best where sound control is key.

Where Can You Use Spray Foam Insulation?

Spray foam’s versatility makes it suitable for nearly every part of a home or building.
Common applications include:

• Attics & Rooflines: prevent heat loss and ice dam formation

• Basements: block moisture and cold air infiltration

• Garages: improve comfort in workshops or storage areas

• Wall Cavities: create a continuous thermal seal

• Rim Joists & Crawl Spaces: stop drafts at the foundation level

Want to see which type works best in each space?
👉 Check our Area-Specific Kits

How Long Does Spray Foam Insulation Last?

Once cured, spray foam insulation can last 20–30 years or more, maintaining its shape and sealing properties.
Unlike fiberglass, it doesn’t compress, rot, or attract pests.
Routine visual inspection (every 5–7 years) ensures there are no mechanical damages or gaps caused by renovations.

Is Spray Foam Safe?

Yes — modern spray foams like Bigrizy Guard are low-VOC and meet Class A fire rating standards.
After curing (usually within 24 hours), the foam becomes inert and non-toxic.
During application, always wear protective gear and ensure proper ventilation.

For more details, read:
👉 Is Spray Foam Insulation Safe? Facts You Should Know Before Applying

How to Apply Spray Foam Insulation (DIY Overview)

You can apply spray foam yourself with a ready-to-use kit. Here’s a simplified version of the process:

1. Prepare the Surface: Clean and dry the area.

2. Wear Safety Gear: Gloves, goggles, and a respirator mask.

3. Shake the Can Well: At least 30–60 seconds before spraying.

4. Spray in Thin Layers: Fill gaps gradually; foam expands quickly.

5. Cure Time: Allow 24 hours before trimming or painting.

Full guide here → How to Apply Spray Foam: Step-by-Step DIY Guide

🛠️ For best results, use the Bigrizy Guard Spray Foam Gun for precise application.

Common Questions About Spray Foam Insulation

Q: Is spray foam better than fiberglass?
A: Yes. It offers up to 50% better energy retention and provides an airtight seal that fiberglass cannot.

Q: Can spray foam be used in cold weather?
A: Yes, but optimal performance occurs between 60–80°F (16–27°C). Below that, curing may slow down.

Q: Does spray foam block pests?
A: While not a pesticide, spray foam eliminates gaps where pests typically enter.

Final Thoughts

Spray foam insulation is one of the smartest investments for homeowners looking to improve comfort and reduce energy bills.
Whether you’re insulating a garage, attic, or entire home, the right foam type and application technique make all the difference.