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How Much To Coat A Flat Roof

Roof Sealing Cost Factors

What Is The Best Roof Coating For Flat Roofs?

Aside from the type of roof and the type of coating you choose, several other factors impact the cost to seal a roof, ranging from labor costs to mechanical roof repair costs.

Labor costs make up a significant portion of the project price, with handypeople charging $55 to $75 per hour and roofers charging $45 to $75 per hour. On average, it costs $0.50 to $3.00 per square foot for labor alone.

Other cost factors include:

  • Flame and chemical resistance

Pitched Or Sloped Roofs

Most pitched roofs are asphalt shingle or tile where complete coatings are not recommended. However, there are some exceptions and considerations when dealing with a pitched roof.

  • Metal: such as in residential settings, can use an elastomeric coating for corrosion resistance or just to extend the life of the roof. You’ll usually pay an additional $1.00$2.00 per square foot since the coatings must be applied in multiple thin layers. This is still less costly than the price of a new metal roof.

  • Asphalt Roll: For small leaks and tears, elastomeric bitumen sealants run between $15$20 per gallon or about $6$10 per 10-ounce tube. Use repair fabric in conjunction with these sealants. Fabrics will cost about $10 for a 25-square foot roll.

  • Asphalt Shingle: Only use bitumen or elastomeric sealants around flashing, vents and skylights. Using complete coatings on asphalt shingles is a short-term fix and may actually do more harm than good. Repairing or replacing your damaged asphalt shingles is the long-term solution. Replace any underlayment and damaged roof sheathing as well. Considering that installing a new asphalt roof costs an average of $9,200 and a new tile roof costs an average of $16,600, the price of repairing asphalt shingles as a solution is well worth the investment.

If you’re still set on coating shingles, you may want to try one of these options:

Tpo And Epdm Membrane

Very durable, these membranes must absolutely be installed by professionals, such as those who work at our roofing business, for example. The cost starts between $8 and $10 per square foot, installation included, but you will then benefit from a watertight roof that will resist all types of weather and wont be damaged by UV rays. Another advantagenot the least of whichit is recyclable!

Read Also: How To Replace Damaged Roof Shingles

Recap On Alternatives To Replacing Flat Roofs

  • Flat roofs are expensive to repair and replace.
  • Most flat roof materials only last 20 to 30 years with some needing to be replaced every 15 years.
  • There are secondary costs to roof replacement.
  • Before you reach out to your local roofing contractor, its crucial that you realize that you can reduce your flat roof cost with an alternative material.
  • EverSeal is a permanent solution to a leaking flat roof.

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What Is The Best Way To Waterproof A Flat Roof

Flat Roof Refurbishment and Repair

Simply apply a sufficient amount of liquid rubber solution to the surface of your roof and spread it evenly to guarantee equitable distribution. It is essential to protect the joints, whether you are putting a cap on your roof.

The liquid rubber will soak into the roofing substance, covering it completely and seeping into every nick and crack, leaving no exposed areas that can turn into issues over time.

Rubber underlayment on your flat roof also improves insulation value while minimizing sound transfer. The heavy-duty liquid rubber resists ultraviolet rays to keep your house both looking good and performing well for years.

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How Much Does Home Depot Roofing Cost Per Square

A recent quote from Home Depot for replacing a 2,000 square foot roof with a new asphalt roof was $21,481 which is $1,074 per square, or $10.74 per square foot. Another quote from Lowes for a 1,650 square foot home was $16,800, which is $1,018 per square or $10.18 per square foot. Both houses had a pitch in the region of 5/12.

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Reasons To Coat Your Roof

Before we discuss the costs of coating the roof in Houston, lets quickly go through why you might want to choose this option.

  • Waterproofing Roof sealant fill hairline cracks and repels water. You can benefit from urethane and silicone resist ponding on commercial roofs.
  • Flame resistance While not all roof coatings resist fire, you can choose one with a UL fire rating.
  • Extend roof lifespan Sealing a worn roof extends its lifespan by 10 to 15 years with a coating that protects against leaks and UV exposure.
  • Resists corrosion Roof coating prevents corrosion and rust on metal roofs. Silicone, aluminum-based, rubber, polyurethane, and elastomeric-acrylic coatings protect the metal from other elements.

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Roof Size And Complexity Of The Job

The size of the building plays a significant factor in the total costs for flat roof membranes. However, roofing contractors will also charge more for a project for a building in a congested or hard-to-get-to area. Flat roofing projects are tricky to complete in metropolitan areas especially if the original flat roofing material needs to be removed.

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Flat Roof Coating Or Sealing Cost By Roof Material

Recoating a fibre-glass flat roof with topcoat

So, how much does it cost to coat a flat roof? There are many factors that a professional roofer will consider, including the current roof material to be coated, the roofâs condition, accessibility, coating material to be applied, desired coating thickness, and warranty.

Roof coating detailed work Carefully sealing all roof edges and seams

Its best to seek advice from a professional roofer familiar with your local market. A local roofing contractor should have experience with application requirements such as temperature and humidity levels. Be sure to ask your roofer about the experience working with various coating materials not all will have experience with all types.

In Colorado, acrylic is not a popular or commonly installed coating material most homeowners and business owners opt for silicone since it performs best with ponding water

In the attached charts, you will see that silicone has the most extensive warranty, with 20-year options for each material type to be coated. With acrylic, only metal roofs can have a 20-year warranty, with all other materials having a 10- or 15-year warranty.

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How Much Does It Cost To Recoat Or Reseal A Flat Roof

A roof replacement is much more expensive than a coating. Tearing off the entire roof and installing a new roof with insulation to meet code requirements can cost anywhere from $20,000 to more than $40,000, based on a 2,000 square foot roof average.

Resealing your current roof can extend its life and avoid costly replacement. Depending on the desired thickness and warranty, a coating can last between 10 to 20 years

Whats great about a roof coating is that one can reseal the roof, again and again, all for a fraction of the costly roof replacement. By contrast, a 2,000 square foot roof coating using silicone ranges from $6,600 to $15,000.

Can I Turn My Flat Roof Into A Green Roof

Green roofs can be created on flat or pitched roofs. These vegetation-covered roofs help reduce the heat island effect and provide a unique habitat for wildlife.

While its a good idea to consider the extra weight, you will have to consult with a professional before making the change. It is important that you can support the added weight and that the waterproofing can handle the higher temperatures and water exposure.

A green roof should be installed on a slope of up to 10°, but if the slope is greater than 20°, make sure you have a structure to prevent the green roof from slipping.

First, put a layer of waterproofing in your shed or garage. It can be made of gravel, mulch, or whatever material you want. Put it up to the roofline and then pack it firmly with a tamping tool.

Place a layer of larger-fiber insulation on top of this layer and then place the second layer of that same material over the insulation.

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What Are The Advantages And Disadvantages Of A Flat Roof

Flat roofs are usually less expensive and less complicated to install than pitched roofs. Because there is no wasted space for an attic, more interior room can be used. The top of the flat roof can be used to mount HVAC units or solar panels, tucking them away from view and saving the yard for other uses.

Disadvantages of flat roofs include: problems with water drainage, especially when improperly installed less space for ceiling insulation more susceptible to temperature spikes aesthetically unpleasant and more fragile structurally than pitched roofs.

Modified Bitumen Flat Roof Repair Cost

SWEPCO White Silicone Roof Coating (19 litres) only £453.18

Repairing a flat roof made of modified bitumen averages $3 to $7 per square foot. Modified bitumen is a popular, affordable material for flat roofs, well-known for its versatility and resistance to extreme temperatures and UV rays. However, modified bitumen roofs are at risk of damage due to debris and impacts from hail and falling tree branches. Pooling of water on a modified bitumen roof can also make it wear down quickly.

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Benefits Of Coating Your Flat Roof

The most visible benefit of coating your roof is the prevention of water leakage. It also integrates well with the old surface. The result is a thicker, better-looking appearance. Other advantages of a properly applied coating include:

  • Extend roof lifespan by reducing heat transfer into the building, especially during the summer. Flat roofs can also be re-coated every 5 or so years, which increases their longevity by decades.
  • Reduce thermal shock caused by variations in temperature. Random expansions and contractions of the roof membrane mean faster wear and tear, which is more likely to cause water leakage.
  • Reduce energy costs by reflecting the suns rays. A coated roof automatically lowers HVAC costs by up to 80%. This makes your building energy efficient by lowering your overall cooling costs. This also reduces the heat load on your building.
  • Help mitigate leaks by protecting the surface of your roof.

Roof coatings can also be applied without affecting the rest of the building or its inhabitants. The overall benefits are a long-lasting roof and reduced maintenance costs.

Flat Roof Drip Edge Repair Cost

Repairing flat roof drip edges ranges from $150 to $400. Drip edges are L-shaped metal pieces positioned at the edge of the roof. They can also be known as drip edge flashing and are used to divert water off the roof, away from any fascias, preventing it from pooling under the roofing materials. Metal drip edges are strong, but they become dented or damaged in storms or because of falling debris. So, they may occasionally require patching or cleaning.

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What Roof Coating Materials Are Available

Roof coating materials are available as either water-based or solvent-based options. Urethanes and silicones are examples of solvent-based coatingsand have industry-wide reputations for lasting far longer. Solvent-based coatings are much pricier and require expert care during the application process.

Silicone coatings are often used where precipitation is heavy, since silicone coatings resist moisture from rain just a few hours after application. Urethane coatings feature great tensile strength. Urethanes molecular spring makes it durable, flexible and able to resist scratches.

Water-based coatings, while less expensive, have a higher failure rate. Acrylic is one type of popular water-based coating. Acrylic coatings are colored white and, therefore, contain reflective properties. While easy to work with, acrylic coatings break down when extensive ponding occurs.

Cost comparisons can direct commercial property owners to the best decision. A silicone sealant ranges from $1 to $1.50 per square foot the installation ranges from $0.50 to $1 per square foot. Acrylic costs $0.15 to $0.75 per square foot with installation from $0.50 to $1 per square foot.

Although acrylic materials are less expensive to start, recoating the roof will have to be done more frequently. In contrast, high-end silicone usually comes with 25- or 50-year warranties. Humidity levels, UV rays and roof contraction and expansion also influence how often a roof should be recoated.

Hiring Someone To Replace A Flat Roof Checklist

Part 5 Fibreglass RoofingTopcoat – GRP Flat roof colour

Before you hire a professional to work on your flat roof, consider the following:

  • What qualifications are needed: A good example is a Level 3 Diploma in Roofing Occupations.
  • What experience do they have? Two years plus experience might be a good start, depending on your budget.
  • Whats their previous work like? A good portfolio will give you an idea of what to expect.
  • Have their previous customers rated them highly: Check for online reviews/feedback of their work.
  • re they part of any accreditation? The more proof they offer of their skillset, the more confidence you will have in their ability.

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Is It Cheaper To Have My Car Roof Painted By Professionals Or Myself

If youre a do-it-yourselfer looking to save some money, it may be worth the investment in time and effort to paint your own car roof. But before you do, consider the following:

  • How much time do you have? Painting a car roof is an involved process that requires multiple steps. There is also room for error along the way. If you dont have several days to devote to the project, you may want to leave it to professionals whose livelihoods depend on their ability to work quickly and correctly.
  • Do you have the necessary equipment? Painting a car roof requires more than just spray paint. Youll need specialized tools like masking tape, sandpaper and detail brushes in order to achieve a finished product that is indistinguishable from one done by professionals. The cost of these supplies can add up quickly especially if they are used sparingly after your project is complete.

Is A Special Contractor Required To Install A Reflective Roof Coating

An experienced roofing contractor should apply the reflective roof coating.

Although the coating may look like ordinary architectural coating, successful application and long-term performance requires proper preparation, repair of leaks or damaged areas, and ultimately proper selection of the correct primer and coating system.

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How Long Does It Take To Replace A Flat Roof

Its crucial to know how long it will take to replace a flat roof because you may have to take time from work. Well go through how long it takes to replace a flat roof here.

Roof replacement might take as little as one day or as long as three weeks. The average roofing replacement for a single-family home takes roughly 2-3 days.

Several factors influence the length of time it takes to replace a roof. The kind and condition of the current roof, the new roofing, materials, and the size of the house are all factors to consider.

Flat EPDM roofing utilises fewer materials than sloping EPDM roofing. Installing them takes less time than heavy tiles or wood shakes. Because flat roofs hold more water than pitched roofs, proper drainage is essential.

Its also worth noting that a new flat roof can take up to two days to install. In addition, most roofers require an extra pair of hands in order to finish their work efficiently.

As a result, youll almost probably need to hire two workers to complete the project. A roof replacement will take much longer, with the removal and replacement of a single garage roof requiring an average of 7 to 8 hours.

Flat roofs with distinctive shapes or that require extensive cutting around roof windows or pipelines, as well as flat roofs on the second or third floors that require scaffolding or access towers, will take longer.

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Additional Tool And Material Costs To Install A Flat Roof


If youre considering DIY flat roof replacement, youll also need to include the costs of additional tools and materials needed for the job in your budget. These costs will depend on what you already have and what you need. Some basic tools youll need include a roofing hammer, roofing nailer, utility knife, roof cleaning equipment, moisture detection tools, and more.

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Diy Vs Professional Flat Roof Repair

Even experienced do-it-yourselfers will want to for extensive flat roof repairs. But spot repairs are within the realm of possibility for most DIYers.

The cost of one hour for a professional roofer to repair your flat roof$50 to $80is around the cost of materials to repair your own flat roof. For around $50, you may purchase materials and a few tools to repair about 10 to 12 square feet of your flat roof.

Acrylic Roof Coating Cost

Acrylic roof coating costs $0.50 to $3.00 per square foot installed, depending on the number of coats and sealant type. The most popular acrylic-based coatings are blends that include elastomeric rubbers, silicone, or urethane.

  • Lasts 7 to 20 years on average
  • Needs outside temperatures above 50°F to cure
  • Comes in many colors
  • Suits hot and sunny climates
  • Not ideal for flat roofs
  • Unsuitable for climates with heavy rain

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Bitumen Roof Coating Price

A bitumen roof coating costs between $1.60 to $5.25 per square foot for materials and labor. In an asphalt-based sealant, a bitumen waterproof roof coating is used to patch vent pipes and spouts, flashings, skylights, and chimneys on asphalt roofs.

Once the necessary preparation and repairs are completed, a roofer will apply the actual asphalt coating to form a weather-resistant film with excellent adhesion to most surfaces, applying two coats, a base, and top coat. This asphalt-based bitumen prep is recommended only on a built-up roof or modified bitumen roof. However, bitumen roofs are often only repaired with asphalt and then coated with acrylic or silicone.

Popular manufacturers include Mule-Hide, Henry, and Black Jack. Several process steps are required, like other coating types, including patching, primers, and the actual coating. Premium brands are found only in roofing supply distributors, while some are available at local hardware stores.


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