Spray Foam Insulation | Ultimate Guide To Fireproof Insulation 2024

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Sound insulation is critical for energy efficiency, comfort, and safety in home remodeling. Spray foam insulation is a versatile and practical option among the many solutions available. This article looks into the subtleties of spray foam insulation, including pricing considerations, fire resistance, and its application in attic insulation.

What Is Spray Foam Insulation?

Spray foam insulation is a composite material generated by the reaction of two chemicals (usually isocyanate and polyol resin). These chemicals are kept in two separate hoppers or tanks and transferred by gas pressure or liquid to the tip of a spray gun. When they meet, they react and form a foam solution. The foam dries in place, creating an efficient air and vapor barrier.

This foam contains little pockets known as “cells.” These cells form air gaps and barriers, making it harder for heat and sound to flow through the foam. And, because the foam expands to fill the space in which it is sprayed, these pockets will reach even the smallest nooks and crannies. These qualities make spray foam an excellent insulator.

How Does Spray Foam Insulation Work?

Spray foam insulation applies a liquid insulating material that expands and solidifies into a foam-like consistency. It is widely utilized in residential and commercial structures to offer proper insulation, increase energy efficiency, and improve comfort. Let’s take a look at how spray foam works, with open-cell and closed-cell options available:

  • Preparation: Before applying spray foam insulation, ensure the area is ready. This usually entails cleaning the surface, ensuring it is dry and free of dust, debris, and other impurities.
  • Application: A specialized spray cannon will apply The mixed liquid foam to the surface. The foam begins as a liquid but quickly expands and foams up as the two components react chemically. This expansion enables the foam to fill in gaps, fissures, and crevices, resulting in a continuous insulation layer.
  • Expansion and curing: When the foam is sprayed on the surface, it expands to several times its original volume, filling in any irregularities and forming an airtight seal. The foam now begins to thicken and solidify. The curing process will be determined by the type of foam and the climatic conditions.
  • Insulation properties: Once cured, the foam produces a firm, robust insulation layer that resists heat transmission. The foam’s cellular structure confines air, allowing it to trap moisture. Because of its higher density, closed-cell foam is more effective at blocking humidity and offering superior insulation value.

Types of Spray Foam Insulation

There are two primary forms of spray foam insulation. Both materials combine compounds that expand in place, but their insulation properties differ. They are also among the most efficient forms of insulation.

Open Cell Spray Foam Insulation

The first type of spray foam insulation is open-cell. As the name implies, open-cell insulation comprises small pockets that are not fully contained. These foams expand significantly (up to three inches every pass), and the dried foam is relatively soft and flexible. These items often employ water or carbon dioxide as a fuel, making them less environmentally damaging than closed-cell models.

Open-cell foam serves as an effective barrier to airflow and sound. It is helpful in walls, ceilings, and roofs. However, due to the open cells, this foam is more likely to absorb moisture and vapor, necessitating a vapor barrier inside the foam in many applications.

Open-cell spray foam insulation has an R-value of 3.5 to 3.6 per inch, resulting in around R-13 in a 2×4 wall or R-19 in a 2×6 wall. However, because this foam expands up to three inches every application, applying several coats after the first without wasting surplus foam is difficult.

Closed Cell Spray Foam Insulation

Closed-cell spray foam insulation, like open-cell, produces an air barrier. However, this foam’s individual cells or pockets are entirely sealed. Furthermore, the cells are significantly more densely packed, making this foam insulation far more robust than open-cell insulation (it can even increase structural integrity in some circumstances).

Because closed-cell spray foam insulation has enclosed pockets, it is substantially more resistant to moisture and vapor. Additionally, these confined pockets boost insulation value, with one inch offering up to R-6.5 insulation. The closed-cell foam also expands far less (about one inch per application) than open-cell foam, making it easier to apply subsequent “coats.”

However, closed-cell foams often use hydrofluorocarbons as a fuel, and HFCs are significantly less environmentally friendly than fuels used in open-cell foams.

Spray Foam Insulation Pros And Cons

Like any other building material, spray foam insulation has advantages and disadvantages. The following aspects should be considered when determining whether this insulation is the best option for a home.


  • Best Coverage: Spray foam insulation expands in place. Thus, it provides far more insulation coverage than fiberglass batts or rigid foam. The installer can point the spray pistol into a tight corner, squeeze the trigger, and let the foam expand into the area.
  • Long-lasting: Spray foam insulation does not degrade and accumulate at the bottom of a stud bay, as spray-in insulation or batts do. When sprayed, this material becomes sticky, expands, and dries in place. It can attach to plywood sheathing, studs, and drywall surfaces, forming a solid bond.
  • High R-Value: Spray foam insulation often outperforms batts and other types of insulation. This is partly due to its expanding nature, which allows it to fit into tight areas and the cells that form within the foam.
  • Air and Vapor Barrier in One: Closed-cell spray foam insulation is an air and vapor barrier in one. Homeowners concerned about moisture or vapor will not need to apply a vapor barrier to the dried foam.
  • DIYable: Spray foam insulation is available as DIY kits. These kits come in compact, portable tanks, and DIYers can insulate their constructions as needed (though it takes some practice).


  • pricey: Spray foam, especially the closed-cell variety, is costly. It is the most expensive way to insulate a home. The expectation is that the installation cost will be offset by energy savings and the fact that it lasts longer than conventional materials, but the upfront cost remains a consideration.
  • Messy: Spray foam insulation installation can be a messy process. When wet, the material becomes quite sticky. Thus, first-time installers may struggle to master the procedure. It’s critical to wear personal protective equipment.
  • Long Dry Time: Leave the construction for a few days to allow the foam to cure. Cured insulation does not emit any gases, but when wet, the chemicals used to produce the foam can be unpleasant.

Spray Foam Insulation Pros And Cons

Spray Foam Insulation Cost Per Square Foot Ontario

Most insulation contractors compute spray foam pricing by the board foot. The best way to estimate how much insulation you’ll need is to multiply the space by the cost per inch. Square foot x $/inch of insulation per sq. ft.

Spray foam insulation costs between $1.00 and $6.00 per square foot. Prices are subject to change based on how many areas of your property you want to insulate. Each insulation firm will charge a different rate.

To better understand, consider this example in which we perform simple computations. You renovate and insulate your home, around 800 square feet of outer walls. A minimum of R22 is required for an above-grade external wall, quoted at $4 per square foot of insulation. The total cost of first-floor external wall insulation is $3200 (800 multiplied by $4).

8 Best Spray Foam Insulation

1. Types of Spray Foam

Consider the many varieties of spray foam insulation and their respective benefits when selecting the best one. There are two primary forms of spray foam insulation: open-cell and closed-cell.

The closed-cell foam helps provide adequate insulation in regions with limited space. When utilized in a conventional wall, it can provide twice the R-value of open-cell foam. In contrast, open-cell foam is less dense and more flexible. It is frequently utilized in applications requiring soundproofing or moisture control.

2. R-value

Spray foam insulation has a high R-value, ensuring your home is energy efficient. The recommended R-value for your area (between 2 and 7) varies depending on the climate.

In colder climates, where temperatures can drop dramatically, a greater R-value is usually required to provide proper insulation and reduce heat loss. However, a lower R-value may be adequate to keep the indoor temperature acceptable in warmer climates.

3. Vapor permeability

Vapor permeability is a material’s ability to enable water vapor to travel through it. To choose the best spray foam insulation, ensure it has high vapor permeability to regulate moisture effectively.

4. Air sealing

Air sealing increases the efficacy of insulation. It reduces air infiltration, resulting in heat loss and higher energy usage. When deciding on spray foam insulation for air sealing, consider how well it regulates moisture and eliminates gaps and drafts, enhancing energy efficiency.

5. Cure Time

For optimal efficiency and convenience, choose spray foam insulation that cures quickly. Faster curing periods are beneficial since they allow for faster installation, lower labor expenses, and less disruption to your everyday routine.

Still, correct installation is critical to the success of spray foam insulation.

6. Fire Resistant Insulation

To select the best spray foam insulation for fire resistance, look for a formulation with good fire resistance. Look for goods that comply with fire safety requirements, such as the ASTM E84 standard, which measures flame spread and smoke development.

Aside from that, evaluate the spray foam’s fire rating, which indicates its capacity to withstand fire for a given period. Spray foam insulation is more fire-resistant as the fire rating increases.

7. Long-Term Performance

When evaluating the long-term performance of spray foam insulation, emphasize durability. The foam should tolerate external conditions such as temperature changes, moisture, and UV radiation.

Consider the foam’s capacity to resist settling or sagging, which can impact its effectiveness. Choose a foam resistant to mold and mildew growth, as these variables can degrade its performance and longevity.

8. Compatible with Other Insulation

To avoid problems, ensure your spray foam is compatible with your existing insulation. Varied insulation materials may have varied features and requirements; thus, consider compatibility when selecting spray foam insulation.

Some spray foams may not cling to certain types of insulation, resulting in gaps or cavities in the insulation layer. Incompatible materials can trigger chemical reactions and reduce insulating efficacy.

8 Best Spray Foam Insulation

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