Yes, spray-in insulation, specifically closed-cell spray foam insulation, can be more fire-resistant than traditional fiberglass insulation. The fire resistance of insulation materials is determined by their ability to resist ignition, slow down flame spread, and produce less smoke and toxic fumes during a fire.
Here's why closed-cell spray foam insulation tends to be more fire-resistant compared to fiberglass insulation:
Composition: Closed-cell spray foam insulation is made from a chemical mixture that contains a combination of polyurethane and other fire-retardant materials. The closed-cell structure means that the foam is compact, with gas pockets sealed inside, making it less susceptible to fire penetration.
Density: Spray foam insulation is denser than fiberglass insulation, which means it can slow down the spread of flames and restrict their access to the structure.
Adhesion: Spray foam adheres directly to the surfaces it's applied to, creating a continuous, airtight barrier. This barrier can help prevent the spread of flames and restrict the supply of oxygen needed for combustion.
Lack of Air Pockets: Unlike fiberglass, spray foam insulation doesn't have air pockets that can promote fire spread, as it's a solid material with a closed-cell structure.
Smoke and Toxic Fumes: In the event of a fire, spray foam insulation generally produces less smoke and fewer toxic fumes compared to fiberglass insulation, which can help improve evacuation efforts and reduce health hazards.
It's important to note that there are different types of spray foam insulation, and open-cell spray foam insulation may have different fire-resistant properties compared to closed-cell spray foam. Open-cell spray foam has a less dense structure and may have a lower resistance to fire compared to closed-cell spray foam.
When choosing insulation for your home, it's essential to consider the fire safety aspects as well as other factors like energy efficiency, moisture resistance, and cost. Always consult with a professional to determine the best insulation option for your specific needs and local building codes.