Spray Foam Roofing - Cost Factors, Distinctive Features, and Other Considerations

In the 1960s-1970s, spray foam roofing was introduced as an anti-leakage solution for flat roofs because it had no seams, most prone to leaking water. Gaining popularity among American homeowners, it has also established its insulation value. In particular, the US Department of Energy claims that this roofing reduces energy consumption and bills by 30%. Today, foam roofs make up 10-15% of all installed roofing systems in the country. If you, like many other homeowners, have been attracted by its benefits, it is crucial to understand how much such a project can cost you.

The average cost of a spray foam roof nationwide is $11,250, with a typical range of $8,100 to $14,000. With material savings, a small roof, and low labor rates in your county, you can hit $6,100. But considering all the price-rising factors, this amount could also be $20,550.

Foam Roof Cost per Square Foot

Both manufacturers and contractors often quote prices per square foot, which helps them maintain price consistency and transparency regardless of roof size. So the total foam roofing cost per square foot ranges between $4 and $10. If broken down into main components, the materials cost roughly $2 - $3,50, and a roofer estimates their services at $2 - $4 per square foot.

Spray foam price per sq. ft.

Spray Foam Roofing Calculator

Spray foam roofing, a popular choice for its insulative and waterproofing properties, involves several key factors influencing overall costs. Read on to delve into how the size of the roof, foam density, cell type (open vs. closed), and the type of protective coating applied can impact the final price of a spray foam roofing project. Understanding these elements will help you build a clearer picture of the potential costs associated with this roofing option.

Foam Roofing Cost by Roof Size

Knowing the approximate size of your roof, you can multiply it by the cost of each square foot, which is $4 - $10, and get a rough budget you should expect.

The Cost of Spray Foam Roof by Foam Density

The higher the density of the foam, the higher its R-value or, more simply, the insulation level. The required insulation level, in turn, directly depends on the weather patterns and temperatures typical of the area where you live.

Low-Density Spray Foam

As you might guess, this density type provides the least insulation, with an R-value of only 3.6 per inch. But don't write it off ahead of time. If you live in a temperate area with mild weather, your contractor may determine that this insulation is sufficient. In this case, the cost of the spray foam roof will be $0.35 - $0.75 per square foot.

Medium-Density Spray Foam

It is the most common density type of spray foam. With a 5.5 - 6.6 R-value per inch, it provides reliable insulation for your home in different climates. The only exceptions are the most severe ones. Depending on the R-value, the cost can range from $1 to $1.50 per square foot.

High-Density Spray Foam

High-density spray foam is the best solution if frequent heavy rains, snowfalls, or extreme heat are common in your area. Its R-value starts from 6.6 per inch, so you are guaranteed excellent insulation. In addition, it differs from other types of high water resistance, which will prevent prolonged rains from damaging your roofing and roof structure. But expect to pay roughly $1.25 - $2 per square foot.

SPF Roofing Cost by Cell Type

This roofing has only two cell types: open and closed. Their main differences are the service life, the level of protection against water, and the price. A closed-cell version is more expensive because it has better resistance to harsh weather conditions. But if heavy snowfalls and rains are not typical for your area, open-cell functional properties may be enough for you.

Open-Cell Spray Foam

The main advantage of the open-cell option is its expanding function. Because of this, it is excellent for limited and small spaces. However, it tends to leak water. So paying $0.35 to $0.65 for each of its boards will cost you extra for a vapor retarder. Also, it has poor insulating ability. But if you live in an area with a temperate climate, it doesn't really matter.

Closed-Cell Spray Foam

Unlike its open-cell alternative, the closed-cell foam does an excellent waterproofing job thanks to its high density and built-in vapor retarder. In addition, its shelf life is approximately 50 years. For comparison, open-cell only lasts 10 years. So although choosing closed-cell foam will cost you $0.95 - $1.55 per board, it saves you the hassle of leaks and the need for frequent repairs.

Spray Foam Roofing Cost by Coating Type

UV protection is considered the primary function of coating. Indeed, roof materials wear out a lot under their influence, so coating with UV inhibitors can extend their service life. But no less important, the coating acts as an additional seamless layer that covers all potential water-permeable points on the foam surface, which prevents leaks.

Acrylic

This coating is sprayed onto the roof, creating a hard membrane 5-10 times thicker than conventional paint. It is almost non-toxic, easy to use, and affordable. If you choose acrylic material, foam roof coating costs $0.20 - $0.75 per square foot. However, it is inferior in performance and durability to its silicone alternative.

Silicone

Silicone is superior to acrylic primarily in terms of waterproofing performance. In addition, it does a better job of UV protection as the primary function of coating in general and keeps your home cool due to its solar reflectivity. Silicone can be applied directly to the roof surface or over the acrylic material. Foam roof recoating cost with silicone ranges from $1.40 to $2.50 per square foot for the material alone. If the weather conditions in your area require more than one coat, you will pay $0.20 - $0.45 per square foot for each additional one.

The Labor Cost of Foam Roof Replacement

There are two main reasons why it is worth entrusting a professional contractor with replacing this roof. First, the foam contains chemicals that can harm your health if not handled carelessly. Therefore, the contractor always wears special clothing to protect the skin and respiratory tract. Second, when providing warranties, many foam roofing manufacturers require only a qualified roofer to install it. Otherwise, the warranty will be void, and you will pay for all possible repairs out of your pocket. 

Roofers usually charge $2 - $4 per square foot or $50 - $100 per hour, but that's a reasonable price for your peace of mind, safety, and the quality of the end result. With MyHomeQuote, finding reliable local roofers is just a few clicks away. Plus, you get free quotes and can choose the right professional whose stated cost of foam roofing replacement fits your budget.

Spray Foam Roof Cost Factors

Even if you understand what cell type and density of foam you need and have even studied the labor costs in your area, your budget is still very approximate. The reason is that the ultimate cost of spray foam roofing depends on many factors. Some of them you may not even be aware of.

• Roof structure (number of penetrations). Any opening on the surface of your roof, be it a skylight, pipe, vent, or chimney, refers to penetration. To ensure a reliable fit and seal, the contractor must painstakingly and carefully apply spray foam around each. Consequently, the more such penetrations, the more time-consuming and labor-intensive the work is, which raises the final cost.
• Roof condition. No professional contractor will install foam roofing on a damaged current roof. Instead, they may suggest repairing its weathered surface, worn substrate, or other damage. The more such breakdowns, the more time they will spend on preparatory work and, accordingly, the more they will charge you.
• Roof accessibility. If you live in a multi-level building, your house has a complex roofline, or your roof is too high and surrounded by many trees, all of these factors make it difficult for the contractor to access it. As a result, they may use special equipment to carry materials to the roof and/or ensure their safety.
• Warranty. The pricing of all brands depends, among other things, on what warranties they provide upon the purchase. The longer the warranty period, the more expensive the material can cost. Some qualified contractors may also offer warranties for the quality of their services. However, it requires an additional fee.
• Location (local labor rates). If your county lacks licensed roofers while the demand for their services is high, expect the cost of foam roof installation to be higher as well. Also, your county's high average wage and total cost of living result in increased labor rates.
• Season. Roofing work peak usually occurs in the spring or summer. Since, at this time, contractors do not have a lack of customers, they can keep high prices. But everything changes in late autumn and winter. Demand for roofing services is falling, so contractors offer discounts to attract and retain customers.

Other Foam Roof Cost Considerations

In addition to the above factors, some services add to the final cost. Some may be mandatory as they affect the quality and durability of the roof, while others may be reinsurance and optional. In any case, it is better to keep them in mind when budgeting.

• Getting permits. In some states, you cannot start any roofing work without special permits, which can cost you $150 - $500. One of the benefits of hiring a local contractor is that they know exactly what permits you need and will even help you get them.
• Roof inspection. Even the most experienced contractor can only give you a final quote and estimate the scope of work after inspecting your roof. During this inspection, they can identify damage that needs to be repaired before installing new roofing. Although you can pay $100 - $400 for this, it will save you from many problems that may arise during work.
• Roof repairs. Since the foam contains chemicals, its repair must be done by a professional wearing protective clothing. When inspecting the roof, they will determine if there is any damage and how severe it is, but on average, expect to pay $3 - $10 per square foot.
• Old roof disposal. Foam roofing can be installed over your current roof. But if it's worn out, broken, or in disrepair, removing it is safer and more practical. If so, it will cost you about $1 - $3 per square foot.
• Underlayment replacement. When it wears out, your roof loses additional protection against moisture penetration. If you live in a humid climate with frequent rains, it can become a problem. Therefore, replacing underlayment for $0.75 - $4.00 per square foot is more cost-effective than repairing leak-related problems.
• Insulation layer replacement. Checking the current insulation is a necessary step in the overall roof inspection. It must be replaced if it is wet. Otherwise, the spray foam will not fit properly. This service can cost you between $3.00 and $7.00 per square foot.
• Cleaning. A clean surface is key for this roofing type, as even the slightest amount of dirt prevents the foam from adhering. This procedure costs only $0.15 to $0.60 per square foot but ensures a quality installation.
• Sealing. This service is often optional. But if you want to increase the energy efficiency and water resistance of your new roofing, sealing can handle that and will only cost you $0.75 to $2 per square foot.
• Extra foam layer. The primary reason for applying an additional foam layer is the hot climate. This layer makes your roof more reflective, so high temperatures outside don't lead to heat inside the house. If you or the contractor decide an extra layer is needed, you will pay $0.50 - $2.50 per square foot.

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