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Cost Of Roof Sealing

Most homeowners spend between $531 to $994 nationally.
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Roofing work is a cost-effective choice for preserving the long-term value of a home. Unfortunately, having a contractor install a new roof or conduct a re-roofing job can carry a lot of upfront expenses. A more affordable alternative may be to have the roof sealed. How much does it cost to seal the roof? The average cost nationally of having a contractor seal a roof is $978, with the normal range of prices going from $120 at the low end to $3,800 at the high end.

National Seal a Roof Costs

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Median Cost


Minimum Cost


Maximum Cost
Average Range:


National Average Cost $1,109
Minimum Cost $65
Maximum Cost $5,000
Average Range $531 to $994
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How do we get this data? This info is based on 245 cost profiles, as reported by ImproveNet members.

Why Have Your Roof Coated/Sealed?

When considering this type of work for your home, it’s important to understand the long-term benefits. No matter what type of materials are on your roof or what shape it is, coating and sealing can provide added protection and better efficiency inside the house. If you notice signs of wear and tear or if it has been a long time since you’ve performed roof maintenance, it may be time to consider making this investment. Here are a few benefits of coating or sealing your roof:

  • Waterproofing: Sealing the roof creates an extra layer of safeguarding against leaks and damage caused by pooling water. The ideal type of sealant depends on the type of roof you have as well as the climate. A roofing contractor will be able to determine which product makes the most sense for your property.
  • Corrosion prevention: Homes that have metal roofing in coastal areas face the threat of corrosion from saltwater spray. A highly protective coat of silicone, acrylic, liquid EPDM, or polyurea can shield against this and help extend the lifespan of the roof’s materials.
  • Flame resistance: This is crucial for keeping your property up to code in many cases. A UL class A flame resistance rating is typically required by code for all roof assemblies. A roof inspector can help you decide if you need a flame-resistant coating and which one would be best.
  • Reflecting heat: A white coating helps reflect solar radiation. This can lower utility bills by decreasing air conditioning usage. Many of the most common sealants and coatings come in white, so you have numerous options.
  • Extending roof life: If you live in a harsh climate, sealing a roof can extend its lifespan by 10 to 20 years. This means you will have less to worry about in terms of maintaining and repairing the roof.

Flat Versus Sloped Roofs 

Roof sealing work has historically been intended only for buildings that have flat roofs, especially for commercial structures that have an existing rubber roof installation that may eventually become porous or brittle. How much does it cost to seal a flat roof? The square footage and materials have the biggest influence on the price. Certain types of roofs bring complications to the formula. Improvements in the quality of available roofing sealants have made sealing an option for homes that have sloped and shingled roofs. A shingled roof will have a higher roof-coating cost per square foot because the sealant will need to be higher quality in order to do the job right. Sealing a shingled roof should be viewed as a stop-gap measure, delaying but not removing the need for re-roofing work to be performed in the future. 

A Word Of Caution On Quality

Any project on a sloped roof will come with a premium attached because the contractor is assuming greater risk by performing the job. Roof sealing projects have a tendency to be messy, especially when using the cheapest and runniest sealants. Paying extra for high-quality work is especially important when sealing a sloped roof because a runny sealant will find its way off the roof and onto the lower stories of the building, the ground and any vehicles or fixtures below. A homeowner should be sure to discuss with the contractor what sealant is being used and how high the risk is of it running off the roof. How much does roof seal cost? Discuss your options with the contractor to ensure you’re getting the best quality at the best possible value. 

A quality roof sealing project should begin with a thorough cleaning and inspection. Some contractors will charge for these services separately while others offer them free of charge, so homeowners should clarify this during the initial consultation. Homeowners should also be aware that costs will increase if a roof has extensive damage, as re-roofing may be a better option. Make sure to keep these factors in mind when asking, “How much does it cost to seal a roof?” 

Making The Most Of A Roof Sealing

roof sealing job will be the most effective when handled several years before the roof is close to the end of its anticipated life. It is important to know how old the house’s roof is and what the expected lifespan of the roofing materials used should be. While repeated sealing jobs cannot extend the life of a roof indefinitely, they can help owners add a few more years between re-roofing projects. This can have significant benefits for the pocketbook, allowing a homeowner to address other improvement, repair and maintenance projects in the meantime.

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