How Much Does It Cost to Have Foam Roofing Installed?

National Average Range:
$8,000 - $14,000
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Reviewed by Paula Reguero. Written by

Spray foam roofing is commonly used to repair and reinforce a roof. Also known as Spray Polyurethane Foam Roofing, this material is sprayed on roofs and expands into a foam that protects the surface by creating a solid layer. Spray foaming has become a popular choice as it’s a durable and lightweight way to enforce a surface, which also puts less stress, wear, and tear on the roof. At the same time, spray foaming is an eco-friendly approach that can lower energy bills. Roofs reinforced with a layer of spray foam are resistant to water damage and prevent standing water, which is an issue with other roofing types and can require costly repairs.

On average, homeowners spend between $8,000 and $14,000, with most homeowners spending around $11,000 for a two-layered, medium density spray foam reinforced with a silicone coat and a sealant. On the low end, you can opt for a one layered, low-density spray foam with an acrylic coat for around $6,225. On the higher end, you can have a three-layered, high-density spray foam enforced with a silicone coat and high-quality sealant installed for $20,250.

Cost to Install Spray Foam Roof

Spray Foam Roofing Cost
National average cost$11,000
Average range$8,000 - $14,000

Foam Roofing Installation Cost by Project Range

Installation of one-layered, low-density spray foam roofing with an acrylic coat
Average Cost
Installation of a 1,500 sq. ft. of two-layered, medium density spray foam roofing with an acrylic coat and sealant
Three-layered, high-density spray foam with a silicone coat and high-quality sealant

Foam Roof Cost per Square Foot

The typical cost to spray foam roof runs between $4 and $7 per square foot with basic material and labor included. As the square footage increases, more materials and more workers are needed to cover the whole surface, ultimately adding to the cost. Below is a table with the average cost homeowners would pay to have the most common roof sizes covered with roof foam.

Foam Roof Cost per Square Foot

Foam Roof Cost per Square Foot

Square FeetAverage Cost (Materials and Labor)
1,200 sq.ft.$4,800-$8,400
1,500 sq.ft.$6,000-$10,500
2,000 sq.ft.$8,000-$14,000
2,500 sq.ft.$10,000-$17,500
3,000 sq.ft.$12,000-$21,000
3,500 sq.ft.$14,000-$24,500

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Spray Foam Roofing Cost by Foam Density

In most cases, a standard SPF roof with a standard layer of foam is between $0.30 to $1.50 per square foot. The thickness of the sprayed foam depends on where you live, and the outside conditions in your area. For instance, if you live in an area with harsh weather (high heat, heavy rainfall/snowfall), the roof needs to provide a higher level of insulation, requiring a spray foam with a thicker density.

The thickness of spray foam depends on the desired R-value, an indicator used to measure a roof’s insulation. There are three levels of foam density: low-density, medium-density, and high-density spray foam. The denser the foam, the higher the insulation of the building, and with it, the R-value. For instance, high-density spray foam has an R-value of 6.6 (or higher) per square inch, which means that if you want to achieve an R-25 value of insulation, you need to have a 4-inch layer of spray foam (25/6.6=4).

Spray Foam Roofing Cost by Foam Density

Spray Foam Roofing Cost by Foam Density

Foam TypeCost per Sq.Ft. (Material only)

Low-Density Spray Foam

Low-density spray foam is the cheapest option among the three, costing around $0.30 to $0.65 per square foot. Typically, it comes with a lower density ranging between 0.4 to 1.4 pounds per cubic foot and an R-value lower than 3.6 per inch. While it’s not as effective for insulation as medium and higher density spray foam, it’s perfect for installing in areas with mild weather as it’s the cheapest option.

Medium-Density Spray Foam

Medium-density spray foam is also known as closed-cell foam with an R-value of 5.5 to 6.6 per inch. The cost can range between $0.90 to $1.20 per square foot. It can be applied as low-pressure or high-pressure two-component spray foam depending on how it’s applied - whether it’s on a smaller area or a larger one. It provides the best balance between cost and insulation, making it ideal for those wanting to get a satisfactory level of insulation and waterproofing while staying on a budget

High-Density Spray Foam Cost

High-density spray foam roofs usually come at the cost of $1-$1.50 per square foot. As its name suggests, high-density spray foam has the densest structure out of all insulation types. It provides an R-value greater than 6.6 per inch. Similar to medium-density, it comes in the form of a closed-cell type, provides a higher level of insulation, and offers the best waterproof mechanism out of the three.

SPF Roofing Cost by Cell Type

Spray foam usually comes in two types: open-cell and closed-cell. One is better than the other in  different situation and settings, so there is no definite winner in the open-cell vs closed-cell foam comparison. Both types come with a different level of energy efficiency and density that impacts the cost and provide a different level of insulation at the same time.

As their name suggests, open-cell foam is made of cells that aren’t fully encapsulated, making them softer and more flexible. On the other hand, closed-cell foam is made of completely closed cells, making them more rigid and stable.

SPF Roofing Cost by Cell Type

SPF Roofing Cost by Cell Type

TypeCost per Board Ft. (Material Only)
Open-Cell Foam$0.30-$0.65
Closed-Cell Foam$0.90-$1.50

Open-Cell Spray Foam Cost

The typical cost of open-cell ranges between $0.30 to $0.65 per board foot plus installation. Open-cell systems can allow moisture to get through, and that’s why they require a vapor retarder, which increases the overall cost of your spray foam roofing project. On the other hand, open-cell spray foam is softer and flexible, resembling a sponge once applied. Due to the weaker durability, it’s not as used in roofing as other types but is more often found in spray insulation applications.

The R-value of open-cell SPF is 3.7 to 4 per inch, but it is a cheaper roofing solution that works well in tight spaces as it has more expansion capability. It’s also lightweight and blocks out sound well.

Closed-Cell Spray Foam Roof Cost

Closed-cell spray foam roof costs between $0.90 and $1.50 per board foot plus installation. It’s denser, weighs around 2 pounds per cubic foot, and is more tightly pressed together, preventing air and moisture from penetrating it. The typical R-value of open-cell Sprayed Polyurethane Foam is 4.9 to 7.1 per inch, which also provides water resistance and helps curb the mold growth.

Closed-cell SPF has a built-in vapor retarder and is used in both roofing and insulation applications. Basically, closed-cell foam is more resilient in the face of water and thus costs more to install. It is strong and more commonly used in roofing than insulation. While it’s a more expensive version, it’s sustainable and results in greater cost-savings over time than other roofing options.

Foam Roof Coating Cost

The cost to add protective silicon or acrylic roof coat is between $1.90 and $3.50 per square foot in labor and materials. Adding a coat of elastomeric membranes gives it an additional layer of UV protection. The coating improves the waterproof properties of an SPF roof, makes it more impact-resistant, and increases its fire rating. Depending on where you live, your roof may require one or two layers of coating. Two types of coating are available: silicone and acrylic, each with a different cost and fit for various settings.

Roof Acrylic Coating

Acrylic polymers are roof coatings designed specifically for roof applications and are one of the cheapest coating materials at $0.15 to $0.75 per square foot for the material only. It’s made of a fully adhered elastomeric membrane five to ten times thicker than house paint. This means that they aren’t mechanically attached but rather sprayed on the roof as a liquid, which forms a solid membrane as it dries. It’s widely used because it is durable and easy to use. Additionally, because of the compounds in it, acrylic coatings have minimal toxicity. Some contractors will first apply an acrylic coating and then upgrade it to a silicone coat. Others may mix the two types to maximize energy efficiency and minimize costs.

Silicone Roof Coating Price

A silicone coating costs between $1.40 and $2.50 per square foot for the material only. It is applied to make the foam more resistant to the elements, especially water. The initial coat is usually included in the price. Typically, contractors charge an additional 10%-15% of the overall cost for each added coat of silicone, which is around $0.14 to $0.38 per square foot. The extra silicone coat is usually embedded with granules for more protection, included in the cost. The texture helps prevent damage caused by the elements and environment, like birds, prolonging the life of your roof.

This silicone coating improves the efficiency of your roof by reflecting the sun and insulating the home, contributing to lower overall utility costs and energy savings. Two silicone coats–the initial included plus an additional coat are typically recommended; however, it depends on the climate and environment where you live.

Spray Foam Roofing Installation

Spray foam roofs are applied using a spray process involving a chemical reaction that expands the sprayed material to 20 times its initial size. The basic necessary materials and equipment average $2 to $3 per square foot, meaning it will cost between $3,000 to $4,500 in materials for a 1,500 square foot home. As for labor cost, most roofers charge $2 to $4 per square foot, so a 1,500 square foot home would run $3,000 to $6,000 for labor. If you want to install an additional layer of spray foam and reinforce it with a silicone coat and a sealant, it would add around $1.35 to $2.35 per square foot, totaling between $8,000 and $14,000 for a 1,500 square foot roof.

The roofing contractor will first need to prepare the surface for the spray foam material by getting rid of all dust, debris, and dirt. Spray foam roofs can only be installed on sunny, dry days to be effective. This requirement will dictate the project’s schedule. Any oils, grime, or contaminants on the roofing surface affect how the foam adheres. If you want to prevent future water and moisture damage, you may choose to go with a thin layer called an underlayment. It’s a waterproof membrane that costs around $3 to $6 per square foot, installed.

The process of installing spray foam roofing is similar to an insulation project. The foam is sprayed onto the surface as a liquid, which later hardens into a solid around 20 times its original size. Because foam roofing comes from a chemical reaction and requires special equipment, it is recommended to hire a professional instead of doing the work yourself. A basic foam roof takes a day or two to spray, depending on the pitch, slope, and size of the surface.

Generally, roofing contractors will charge $2 to $4 per square foot, rather than an hourly rate, as the length of their work depends on the size of the roof. Prices vary because materials are expensive, so errors can be costly. Also, some specialized tools are involved in spraying foam roofing that most people won’t have on hand.

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Foam Roof Replacement

Replacing a foam roof costs around $4.50 per square foot, instead of roofing-over, which costs between $2 and $3 per square foot. Typically, spray foam roofs last around 10 to 20 years before needing any repairs or replacements. They can last over 50 years with proper care. To ensure your roof lasts and protects your home properly, you need to have it regularly inspected by a professional. Often, the cracks and flaws you notice can be repaired, but some signs indicate it needs to be replaced soon. One of those signs is spots with leaks and mold on your upper walls. If you notice these, it means that the quality of your roof is deteriorating and needs to be either repaired or replaced.

Spray Foam Roofing Pros and Cons

More and more homeowners opt to have a foam roof installed because of the value they receive at an affordable price. For one, it provides eco-friendly insulation, making it great for both cold and warm climates. Additionally, installing and maintaining a spray foam roof is pretty straightforward and provides a lightweight, seamless, waterproof cover that protects the home efficiently in all types of weather.

The installation requires dry, warm weather, which may dictate the schedule and time it takes to install an SPF roof. The chemicals used in the production have been proven to be toxic, although most manufacturers claim that these disappear once the foam is installed. These chemicals may cause sensitivity or allergic reactions to people prone to reactions from chemicals.

Professional wearing protective gear and installing spray foam roofing

Spray Foam Roof Maintenance

To make small foam repairs, like cracks and tears, you may purchase a repair kit for $200 to $750 from a local supplier. You will save money on roofing repairs and maintenance with a spray foam roofing system, as these roofs are easy to care for and very durable. However, these must be maintained and repaired to ensure they last for the predicted lifespan of 10 to 20 years.

Some preventative maintenance includes regular roof cleaning, which costs $0.10 to $0.75 per square foot, depending on the cleaning method you choose. Routine cleaning of your roof and gutters preserves them from the elements and cleans any debris, leaves, or branches that may have fallen on it. This ensures that it will continue to provide long-lasting protection and insulation.

Plan to apply a new silicone restoration coating every ten years or so, which costs about $1.30 per square foot. This means that to replace a 1,500 square foot roof, you would pay around $1,950 plus installation costs. In general, you can expect to pay a little more than one-fourth of the total cost of your original foam roofing system project and installation.

Foam Roof vs Shingles

The average cost to install roof shingles varies greatly depending on the type of shingles you will use. The cost can be between $1 per square foot for 3-tab shingles and $50 per square foot for bitumen shingles (material only). However, most homeowners pay around $3.50 to $5.50 per square foot with labor included, so you can expect to pay between $5,250 and $8,250 to install roof shingles on a 1,500 square foot roof.

The complexity of the roof, the shingle material, the style of roof you choose, and the additional work needed impact the overall cost. Roof shingles are installed over a felt underlayment and a plywood roof deck by overlapping the layers on the roof. While they can be very expensive, the average cost of having roof shingles installed is lower than spray foaming, 3.50 to $5.50 per square foot compared to $4 to $7 per square foot for spray foam roofs. In addition to this, the durability of roof shingles is sometimes three times greater than the foam roof, ranging between 20 to 60 years, depending on the type of shingles you install.

Spray foam is commonly used for flat roofs, while roof shingles are more fit for low- to medium-pitched roofs. This is because flat roofs are more prone to standing water and leaks, against which spray foam is far more effective than shingles. Roof shingles can also be installed on high-pitched roofs, but this makes installation, repairs, and maintenance a bit challenging.

Foam Roof vs Shingles

Foam Roof vs Shingles

TypeCost per Sq.Ft. (Materials and Labor)
Foam Roof


Roof Shingles$3.50-$5.50

Foam Roof Cost Factors

A spray foam roof costs $2 to $4 per square foot on average, meaning it will cost $2,400 to $4,800 in materials for a 1,200 square foot home. The larger the roof’s surface area, the more costly the installation of the roof. The exact costs fluctuate due to many factors, such as the size of your property and the obstacles that arise. Another important factor is the necessary materials and equipment the roofers use. You can also opt for additional silicone or acrylic roof layers, which will add to the overall cost.

As we mentioned above, spray foam roofs must be installed very precisely, so easy access to your roof is key. If contractors must deal with vegetation, foliage, or have other difficulties when accessing the roof, it will delay them and increase labor costs. Additionally, roofs with lots of architectural details or obstructions, such as skylights, pipes, and chimneys, may require more time to spray the roof, increasing the overall cost based on the increased labor time.

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Enhancement and Improvement Costs

UV Roof Protection

If you live in an area with lots of sun, your spray foam roof will require an additional layer of protection. To ensure it will last longer, you want to block more UV rays by adding a special protective layer to the roof. These coatings are added on top of the standard roof coating and increase your overall costs by around a third, translating to around $1.90 to $3.50 per square foot in labor and materials.

Roof Underlayment Cost

You can opt to install an underlayment under the roof for a cost of around $3 to $6 per square foot with installation costs. Roofing underlayment is applied under all roof materials directly on the roof deck before installing the spray foam. It’s a membrane that adds an additional layer of protection and helps prevent moisture from leaching in through your foam roof. The main materials used for underlayment are asphalt-saturated felt, non-bitumen synthetic, and rubberized asphalt.

Extra Foam Layer

Adding an extra layer of foam costs around $0.50 to $1.50 per square foot. Foam roofs naturally lower energy costs because they are lightweight and white, reflecting the heat naturally. You can potentially lower your energy bill even more by adding an extra layer of foam to make the roof thicker and more reflective.

Foam Roof Sealant

A great option for preventing future leaks is to apply roof sealant, which typically costs around $100 for 5 gallons plus an additional $0.45 to $2.50 per square foot to have it installed by a professional. Roof sealants repair small cracks, punctures, or gouges on the roof and prevent water or moisture from accumulating. However, areas with bigger damage may require repair or roof replacement. When you apply a sealant, it will absorb damage from the sun, snow, ice, and water instead of your roof. It provides an additional layer of protection. Keep in mind that the sealant you use has to be compatible with your spray foam roofing system.

Additional Considerations and Costs

  • Chemical fumes. Keep in mind that during installation and while it’s drying, spray foam may release chemical fumes. Talk to your contractor about whether you can be in the home when they are spraying your roof. You may need to leave the house to avoid inhaling chemical fumes. You should also avoid being present in the home if you’re allergic or sensitive to the chemicals used in spray foam.
  • Permits. Typically, you will need a permit to build or replace a roof of any kind. If you are only making small repairs on less than 100 square feet, you don’t usually need a permit, though requirements and laws vary for each geographic locale. You should expect to obtain permission and approval from your homeowners’ association before installing your new roof, if applicable.
  • Old Roof Removal. Having the old material removed from your roof typically adds $0.50 to $1.00 per square foot to the overall cost. Removing the old material is required to do some repairs, while other times, it’s needed to maintain the roof in an optimal state. Many contractors add this in with their estimate and installation quote, but you can ask for a separate quote for the removal job only.
  • DIY. If you opt to do it yourself, there are kits that you can purchase for an average cost of $900 to $3,000 for a basic 1,200 square foot roof. While installing spray foam roofing can be a DIY job, it can become quite messy. Roof jobs are quite risky, so any mistake can result in injuries or thousands of dollars in roof damage. On the other hand, licensed contractors have the right equipment and knowledge to spray foam roofs, so it’s always recommended to hire a professional to do the job.
  • Roof Style. You can select from many different architectural roof styles. Some styles have many architectural details or obstructions, such as skylights, pipes, and chimneys. All these may require more time to spray, which will increase the overall cost based on the number of extra hours that will be spent.
  • Insulation. Spray foam roofing systems provide insulation by keeping the hot air out in warmer months and holding in the warm air during winter. In addition to this, the spray foam is waterproof, which makes your home less vulnerable to leaks, moisture, and rain, which could breach other types of roof systems.
  • Certification. Consider getting a LeakFREE® Roof Certification for your spray foam roof. It's the highest roof certification given by the National Roof Certification and Inspection Association. It is a federally trademarked document that guarantees that your roof will remain LeakFREE® for up to five years, or a member of NRCIA will repair it. The certified inspector from NRCIA will examine and analyze the interior, exterior, perimeter, attic, and rooftop to ensure it meets the highest safety standards before issuing the Certification.


  • How long does a foam roof last?

One of the most compelling characteristics of a spray foam roof is its durability. These roofs last between 10 and 20 years, although, with the proper maintenance, they can last over 50 years.

  • Can you walk on a foam roof?

Yes, you can walk on a foam roof. Foam roofing is very durable and can support heavier weight and traffic than some other roofing types. However, the surface tends to be slick when wet, so be careful not to slip while walking on it.

  • How much does polyurethane foam cost?

Sprayed polyurethane foam costs around $2 to $3 per square foot for the foam only, around $2,400 to $3,600 for 1,200-square feet, plus labor costs of applying it to the roof surface.

  • How much does spray foam roofing cost?

The cost of installing a foam roof is $8,000 to $14,000 for an average 1,500 square foot home, including a two-layered spray foam roof installed with a medium-density foam and reinforced with a silicone or acrylic coat and an additional sealant layer.

  • What is spray polyurethane foam roofing?

Sprayed polyurethane foam is a combination of isocyanate and polyol. The chemicals used are pumped from separate containers and mixed on the job site, after which they are sprayed onto the roof surface. Once sprayed, the foam expands and hardens into a solid, durable roof that is easy to care for and resilient.

  • Will open-cell spray foam insulation really rot your roof?

No, spray foam will not rot your roof. However, if it is not installed properly, you could allow moisture in, which will then rot a roof. When water permeates the foam, it will degrade over time. Correct installation is key.

  • How much does it cost to install a PVC roof?

The precise cost of PVC roofing varies based on your location, materials, and other considerations. Generally, PVC roofing costs $3 to $7 per square foot installed but could be as much as $8 to $12 or more per square foot.

  • How much does it cost to recoat a foam roof?

On average, recoating a foam roof costs about $1.30 per square foot or a little more than one-fourth of the total cost of your foam roofing system project and installation. The total cost of recoating a foam roof averages $8,250.

  • Can you put solar panels on a foam roof?

Solar panels can be installed on any roof as long as there is enough sunlight reaching the area.

Cost to have foam roofing installed varies greatly by region (and even by zip code). To get free estimates from local contractors, please indicate yours.

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