How Much Does Spray Foam Roofing Cost? [2025 Data]

Roof Size

Spray foam roofing is installed by spraying a liquid material onto a prepared roof surface. The foam expands and solidifies once applied to form a durable protective layer. The main factor in the cost of spray foam roofing is how much material is used, so your roof’s size will have a major effect on how much you’ll pay. A larger roof requires more material for full coverage, so expect to pay more for a larger roof.

Roofer Costs

Labor costs for installing spray foam roofing run an average of $2 to $4 per square foot. Some roofers may charge by the hour or as a percentage of the total project cost, so make sure you know how your roofer’s labor fees are structured. A local roofer who specializes in spray foam roofing will ensure the job is done right and your home is properly protected from the elements. 

Additional Cost Factors

When choosing between a spray foam roof versus tar and gravel or other materials, it’s worth looking at all of the factors that influence how much you’ll pay. We’ve broken down some of the things that affect the cost of spray foam roofing. 

Foam Thickness

Spray foam roofing is most often applied in a 1-inch to 1 1/2-inch thick layer. In some cases, a thicker foam layer may be required. A thicker foam layer uses more material and will cost more than a thinner one.

Foam Density

Spray foam roofing comes in three common densities: low, medium, and high. The higher the density, the higher the R-value or insulating effectiveness.

Cell Type

In addition to foam density, the foam’s cell type will also affect the price. Spray foam roofing is available in open-cell, which gives a more flexible structure, and closed-cell, which results in a denser, more rigid final product. Open-cell foam costs up to three times less than closed-cell foam—expect to pay $0.30 to $0.65 per board foot for open-cell compared to $0.90 to $1.50 for closed-cell.

Topcoat

Once your spray foam roofing has been installed, your roofer will apply a protective coating that defends against UV rays and other environmental damage. Topcoat costs will depend on the material used and the thickness of the topcoat layer. Silicone coating costs between $1.40 and $2.50 per square foot, while acrylic coating averages $0.15 to $0.75 per square foot.

Removal 

In some cases, spray foam roofing can be applied over the existing roof, so no removal is needed. If the old roof needs to be removed, plan on spending another $1 to $3 per square foot for removal and disposal. 

Underlayment

Local building codes may require an underlayment underneath spray foam roofing—this layer adds moisture protection and additional stability for the foam. Underlayment is available in various materials and costs an average of $2 to $6 per square foot.

Permits

Roof work requires a building permit from your local building authority to ensure all work is compliant with building codes and regulations. Roofing permits cost an average of $250 to $500 but can vary widely depending on location. Obtain a permit before beginning any work—you may end up with hefty fees or penalties otherwise.

DIY Spray Foam Roofing vs. Hiring a Pro

You may be tempted to tackle this project as a DIY to save on labor costs, but installing spray foam roofing requires specialized equipment and experience, so it’s a job that’s best left to the pros. Improper installation can lead to leaks, inadequate protection, roof damage, and more. Your insurance company or local regulations may even require you to hire a roofer to install spray foam roofing to ensure it’s in compliance with building codes.

Spray Foam Roofing Replacement vs. Repair

Spray foam roofing is relatively simple to repair, so for a relatively new spray foam roof that’s been maintained properly, repairs are cost-effective. If your roof is more than 20 years old or has extensive damage, you may want to look into roof replacement costs instead of widespread repairs. Replacing your spray foam roofing instead of repairing it will ensure a consistent, durable layer of protection from the elements.

How to Save on Spray Foam Roofing

Unless you have the equipment and experience to install spray foam roofing, you won’t be able to save on labor costs by doing it yourself, but you may be able to reduce costs in other ways. Work with your roofing pro to determine the type and thickness of foam, topcoat, and underlayment required. You can save on project costs by not using more expensive materials than necessary. Also remember to get multiple quotes for the job and make sure you clearly understand what each quote entails. 

Does Spray Foam Roofing Increase Home Value?

Installing a new roof is a worthwhile investment, both for the protection it provides and for its appeal when it comes time to sell. Spray foam roofing has its pros and cons, and your return on investment (ROI) will depend on your real estate market and whether this type of roofing is desirable in your area. Spray foam roofing, like PVC roofing, is most often used on flat roofs, and the benefits of each material will vary based on local climate conditions and the specifics of your home. 

How Angi Gets Its Cost Data

Home is the most important place on earth, which is why Angi has helped more than 150 million homeowners transform their houses into homes they adore. To help homeowners with their next project, Angi provides readers with the most accurate cost data and upholds strict editorial standards. We extensively research project costs to develop the pricing data you see, so you can make the best decisions for you and your home. We rely on reputable sources, including the U.S. Bureau of Labor Statistics, academic journals, market studies, and interviews with industry experts—all to ensure our prices reflect real-world projects. 

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