Is Foam Insulation Flammable? 

This article will answer the question, “is foam insulation flammable?”. It also covers several topics about types of foam insulation, its benefits, and the precautions for safely handling foam insulation.

Is Foam Insulation Flammable?

Yes. Foam insulation is flammable. Indeed, spray foam, just like any other type of foam plastic substance, can catch fire. 

On the other hand, foam insulation is designated as a “class 1 hour fire rating,” which implies that the material can survive exposure to a standardized fire for one hour. 

This rating indicates that the material is safe. This suggests that it can be used to help control the spread of a fire and that it will not, in any case, operate as an accelerant. 

Ratings for a structure’s ability to sustain a fire simulation are often given in terms of the number of minutes or hours it can remain standing.

What Is the Definition of Foam Insulation?

In determining whether or not insulation is combustible, it is essential to remember that flammable insulation is not automatically superior to fireproof insulation. 

Companies are trying to persuade homeowners that using insulation in their homes that can catch fire that is the most effective form of insulation currently available on the market. 

No insulation is entirely fireproof, and there is more information that you need to know about the way the insulation will react to fire before you can use it.

The property of being fireproof, also known as fire resistance, denotes that the substance in question is not combustible and can consequently survive the effects of fire. However, as was said earlier, no insulation currently available is of such high quality.

A material that is used to slow or stop the rate at which a fire might spread is called a fire retardant. This is possible because the foam insulation contains preservatives, which lower the flammability of the fuels and potentially lower the burning rate.

Closed-cell spray foam insulation and open-cell spray foam are two types of foam insulation used. 

An impermeable membrane that immediately hardens upon application is produced by the components and procedures used to install spray foam and inject foam into the spaces within your wall cavities.

What Are the Benefits of Using Foam Insulation?

  • The fact that this material can help save money on expenses due to its relatively low cost is a significant advantage.
  • This substance has a relatively dense and liquid-like texture, allowing it to absorb heat more effectively and ensuring that it does not quickly fade when exposed to heat or cold.
  • Reduce Your Heating and Cooling Costs While Improving Your Indoor Climate and Saving Money

If you insulate your home with foam, you can cut your monthly energy bills by as much as 30 percent and give your heater and air conditioner the break they need.

  • The spaces and crevices in your walls and those around your windows and doors allow sound to move through your home. 

Filling foam insulation in the cracks and crevices helps lower the background noise level and create a more comfortable living environment.

  • Reduce the humidity, which will slow down the growth of mold.

Mold thrives in damp environments when openings and fissures all around a property, the relative humidity level stay elevated. Because of this, condensation and even frost can sometimes form on your window surfaces. 

Warm, moist air rises, and this air causes the ceilings and attic to get saturated with moisture. 

This can lead to the growth of mold, which you might overlook at first but which, in the long run, can result in rotted wood, damage to the home, and possibly even health problems for allergy-prone family members.

  • As a defense against fire and smoke. By obstructing the movement of oxygen, fire-blocking foam makes it more difficult for flames to move from one location to another. 

Oxygen can move freely from one room to another in your home because of the spaces around your pipes, electrical wires, and outlets. 

Because oxygen is necessary for spreading fire, using a fire break to block the flow of oxygen gives you precious additional time to escape to safety if there is a fire.

What Kinds of Precautions Should Be Taken When Working with Foam Insulation?

  • Before beginning use, obtain any particular instructions.
  • Keep clear from open flames, sparks, heat, and hot surfaces
  • Spraying on an open flame or any other ignition source should be avoided.
  • Do not pierce or burn the pressurized container anytime, including after usage.
  • Dust, fumes, gas, mist, vapors, and spray should not be breathed in.
  • Stay away from them if you’re nursing a baby.
  • After handling, one should thoroughly wash their skin.
  • When using this product, you should not consume any liquids or smoke cigarettes.
  • Only use this product outside or in a room with adequate ventilation.
  • Work clothes that have been contaminated in any way should not be permitted to leave the premises.
  • Put on gloves that offer protection.
  • If there is insufficient ventilation, you should use respiratory protection.
  • Ignition can come from several different places, including sparks and open flames. Therefore, you should steer clear of all of them at all costs.
  • Taking additional safety measures can assist in lowering the risk of experiencing a static discharge—more information about this.


Foam insulation is classified as flammable material. Safe handling precautions should be conducted to avoid flammability risks.

Frequently Asked Question (FAQs): Is Foam Insulation Flammable?

How does foam respond when exposed to flames?

Foam with high or medium expansion can be used to reduce the amount of air oxygen drawn into the combustion process while separating it from combustible gas. 

Because of the foam’s low thermal conductivity, flammable material that has not yet ignited or been extinguished is protected from thermal radiation and ignition sources.

What temperature does foam melt?

It will begin to become pliable at 212 degrees Fahrenheit and completely melt at 464 degrees. Styrofoam containers help prolong the freshness of food stored in the refrigerator; however, the food cannot be re-heated or baked in these containers.


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