What Is The Best Roof Coating?

What Is The Best Roof Coating?

Table of Contents
    Add a header to begin generating the table of contents

    With increased labour prices and environmental concerns, a roof coating may be the best option for a building. By acting as a barrier between the roof and the weather, a coating can save energy expenditures by protecting the structure from the sun's damaging ultraviolet radiation.

    It also reduces the frequency of expansion and contraction that causes the underlying membrane to fail in service applications. Although all coatings resist water, some are stronger than others at preventing water from pooling.

    When compared to the expense of a complete roof replacement, a coating may be a worthwhile alternative. The roof's location, slope, and chemical exposures, heat, and UV rays are all factors that should be investigated to determine the roof's current state.

    Roof Designs

    Coating your roof has many advantages. Flat roofs are the lowest priced and most effective approach to improve the energy efficiency of a building. To keep the interior of a building at a comfortable temperature, roof coverings are a must.

    Their reduced energy consumption is a boon to HVAC systems. The coating makes surfaces more reflecting and less emissive. As with physical and water damage, chemical damage is also avoided. Roof coatings can extend the life of your roof by a number of years, and if that isn't enough, you can always get a new coating.

    Flat Roofs

    What Is The Best Roof Coating

    Silicone roofing products like Gaco S-2000 Roofing Coating are commonly recommended for flat roofs. The fact that it does not become weakened by the constant presence of water on flat roofs is a major plus.

    Since silicone is inherently resistant to moisture and dampness, unlike some acrylic-based coatings, it does not absorb water.

    It doesn't lose its shape over time or need to be reinforced with cloth. The time and effort required to perform additional labour is eliminated. You need far less of this substance than you would of acrylic coatings because a little goes a very long way.

    Green Concrete

    Elastomeric roof coatings made of silicone, such acrylic or urethane, are the finest option for concrete roofs.

    With this method, leaks and corrosion on roofs won't be a concern anymore because it's water-based and seamless. Its high reflectivity makes it useful for cooling roofs.

    Roof Coatings Available On The Market Today

    If you're trying to decide which coating is ideal for your roof, have a look at the following four options.

    Roof Coatings Made Of Acrylic

    Acrylic is an inexpensive option that works well for many different kinds of roofs. They're water-based, so they reflect the sun's rays without absorbing them, but they'll gradually thin out over time.

    Several varieties of acrylic polymer are used in acrylic roof coatings to increase durability and extend the coating's useful life. You may expect a long life from this roof coating at a reasonable price.

    Emulsions Of Asphalt

    Asphalt emulsion is another popular choice for restoring roofs. Asphalt particles are suspended in a water-based binder, and clay is employed as a binding agent, to create this product.

    Asphalt emulsion is a black or brownish-black liquid that is fortified with organic and inorganic substances and various additives.

    These coatings, also known as emulsified asphalt, are made up of tiny bits of asphalt that have been dissolved in water. Their emulsifying agent of choice is clay.

    Coatings like these typically include a variety of organic and/or inorganic fibres and fillers incorporated into them for reinforcement.

    The coatings can be made in a variety of colours, including black, brown, and reflective options thanks to the use of titanium dioxide or aluminium pigments.

    The coatings can be "swept on" with a push broom at a rate of around 5.6 litres per 100 square feet. In terms of ease of installation, this method may be the greatest there is for roof coatings.

    Howeveryl Rubber

    Butyl coatings have remarkable tensile and elongation properties. This polymer, based on a solvent, is excellent for use in roof repair and maintenance since it is highly reflective and dries quickly.

    As a steam barrier over spray urethane foam systems, butyl rubber coatings are often employed in cold storage/freezer systems because they have a low permeability.

    Butyl coating systems can be applied to many different kinds of roofing materials, including metal, modified asphalt, single-ply, built-up, and spray foam. They can be sprayed or rolled on at a rate of roughly 7.5 litres per 100 square feet and are commonly white, grey, or brown in colour.

    Butyl coatings mostly suffer from low density and poor colour stability. In comparison to other elastomeric coatings, they are more expensive since more material is needed to reach the appropriate dry film thickness.

    Additionally, they can be difficult to spray and harsh on application machinery.

    Roof Coverings Made Of Polyurethane

    There are two primary categories of polyurethane roof coatings, aliphatic and aromatic. While aliphatic coatings are more expensive, they are also UV stable, while aromatic coating are less pricey but not as UV steady, which is why the latter are typically employed as a base coat.

    With urethane roofing, it's best to use an aromatic topcoat and an aliphatic topcoat. This will make the roof last longer, keep it cleaner for longer, and make it less likely that water will pool on it, as compared to an acrylic coating.

    The polyurethane coatings are the most impact resistant and can withstand traffic the best. Both aromatic and aliphatic polyurethane roof coatings are widely used.

    Aromatic coatings are employed as a foundational layer since they are inexpensive yet susceptible to fading when exposed to the sun. When compared to other coatings, aliphatic coatings are much more expensive, but they are resistant to UV light, they retain their colour well, and they don't collect dust.

    Roof Coatings Made Of Silicone

    Silicone coatings often make primer unnecessary. These require humidity to complete the curing process, and the presence of moisture might speed up the process.

    Silicone coatings are resistant to cracking and hardening and hold up well in all kinds of conditions. However, this coating tends to keep grime embedded in it. Also, it can withstand being torn, so you may use it with any sort of fabric.

    Silicone Coatings Based On Solvents

    To make a silicone coating, a silicone base is often combined with a catalyst and solvents. Coatings made of silicone are biodegradable since silicon (Si) is a natural element.

    There are a variety of ways to apply them to a roof, such as spraying or rolling. There is a wide range of colours for silicone coatings, from translucent to reflective white.

    Asphalt Coatings Based On Solvents

    Because the asphalt (crystalline solid) is "cut way back" with such a solvent to liquefy the coating, solvent-based asphalt coating are also known as cutback coatings. In turn, this facilitates the coating's application. Both asphalt black and a reflective aluminium coating are offered for cutbacks.

    A solvent-based asphalt coating can be rolled on with two rollers at a rate of about 5.6 litres per square foot. In many cases, this coating type will contain asbestos, so users must exercise caution while selecting raw materials.

    Coatings based on silicone can be applied either by spraying or rolling, with the latter method requiring a roller with a medium nap. These coatings are typically applied at a rate of 7 to 13 litres per 100 square feet. though this might vary greatly depending on the surface being coated.

    Silicone Offers Two Significant Advantages Over The Other Four Coating Types:

    • It's durable enough to withstand prolonged exposure to ponding water and
    • It doesn't even need a primer to stick to most surfaces.

    Coatings applied to a roof can help maintain its integrity, protect it from damage, and even restore it in rare cases. Acrylic roof coatings and silicone roof coatings that are applied using a solvent are two of the best on the market. Yet, it's not always clear how to begin the process. Hiring roofing experts, then, can end up saving you money.

    The Advantages Of Roof Coatings

    The use of elastomeric roof coatings dates back quite some time. However, many building managers and owners are all still clueless about the benefits they offer. Let's take a deeper look at some of the major advantages a coating system gives before getting into the physical features present in various coating types.

    Less Expensive

    A new roof can be a significant financial investment. A complete roof replacement might cost somewhere between $5 to $15 per square foot, depending on the material currently in use. On the other hand hand, a fee roof restoration offers the same advantages as a new roof but at a much lower price.

    Roof coatings save time and money compared to full roof replacements because they can be put directly over existing surfaces. Therefore, a roof coating system can cut your building's maintenance costs by 50-70%.

    Life Extends

    An elastomeric coating system's capacity to lengthen the service life of a roof is probably the most well-known benefit it offers. Although roofs typically only last around 20 years, a coating system may extend that by 10, 15, or even 20.

    Protecting and enhancing the function of ageing roof membranes, elastomeric coatings serve as a waterproof barrier. Once a coating technique has been established and maintained correctly, it can be recoated multiple times. It can also lessen the frequency with which repairs are required.

    Construction Debris Has Been Reduced.

    Recent estimates place the amount of roofing trash in landfills at around 40% of all building waste. Workers can save money by delaying the need for an expensive roof replacement and avoiding the hassle of removing and disposing of old insulation & roofing membrane if they apply a roof coating at the right moment in the roof's life cycle.

    Defends Against Roof Leaks

    It is possible to prevent leaks by applying a coating to a roof. The coating not only improves the roof's appearance, but it also protect it against the growth of mould and mildew, which can weaken the structure and cause leaks.

    Maintains The Temperature Of Your Building

    The sun's rays will be reflected off of a white and reflective roof instead of absorbed. The coating's reflecting properties lower the building's temperature, which has a significant impact on indoor temperatures and cooling costs.

    Lowers Energy Costs

    It is possible to increase a building's energy efficiency by coating the roof. White roof coatings may reflect 80-90% of a sun's harsh Ultraviolet radiation and reduce heat transfer to your building, making them superior to traditional dark-colored roofing materials.

    By lowering the demand placed on air conditioning systems during the hottest part of the year, this can reduce the cost of cooling a building's interior by as much as 20 percent.

    Furthermore, a coating system's outstanding reflecting and emissive properties can dramatically decrease roof surface temperatures while also creating a more comfortable working environment for such occupants of the building. Even in unheated areas, temperatures can drop.

    Enhances Sustainability

    Increased environmental legislation and building rules, as well as public concern for the environment, have all contributed to a rise in the demand for environmentally friendly roofing materials.

    The annual accumulation of garbage in landfills is largely attributable to roof tear-offs. Roof coating systems, on the other hand, can be applied over previously installed roofing without tearing it off, allowing you to recycle your current roof while reducing waste and your carbon footprint. Added sustainability is possible because of recoating, as was previously mentioned.

    Environmentally Conscious

    Many modern elastomeric coatings are created with low or no volatile organic compounds (VOCs), further reducing their environmental impact.

    Enhances Green Reputation

    Depending on your company's objectives, you may wish to demonstrate to clients, suppliers, and employees that you are making every effort to reduce the building's environmental impact.

    Your good name may benefit from this. Using a roof coating to create a green roof is a simple and cheap option for this.

    Aesthetic Enhancements

    Managers can save money by covering a roof which is visible from ground or from adjacent buildings instead of replacing an unattractive, aged roof for aesthetic grounds.

    Typical coating methods have not shown much success being applied to preexisting finishes, thus it may be necessary to replace older prefinished metal roofing systems if the paint begins to fade or peel. Roofs can be restored to its former glory with the help of modern coatings that use Kynar colours.

    Physical Characteristics To Consider

    One cannot generalise about roofs because they all vary. In order to ensure a coating would perform well in a given roofing environment, it is necessary to assess its physical qualities. The manufacturer's item datasheets will include all the technical details you need, including the following properties.


    A material's elongation is the maximum percentage by which it may be stretched before snapping. The average range for an elastomeric coating is between 250 and 900%. Coatings having a high elongation value are better able to withstand the constant stretching and flexing of a roof without breaking, thinning, or peeling.

    Tensile Power

    A material's tensile strength indicates how much tension it can withstand before snapping. Most elastomeric coatings have a tensile strength of between 250 and 1200 psi, though this varies widely by chemical (pounds per square inch).

    Tensile strength and elongation are connected, but in the opposite direction. There is an inverse relationship between their growth and that of the other. To create a membrane that can appropriately flex and move with roof surfaces, the finest roof coating formulae strike a compromise between the two features.

    Permeability (Moisture Resistance)


    Materials and membranes can be said to be permeable if and only if they have a certain perm rating, which indicates the ease with which fluids and gases can move through them. There is a wide range of variation in this number from one coating to the next.

    Acrylics, for instance, have a high breathability rating because of their low perm rating. However, silicones' lower perm rating gives them an edge in not letting moisture through. Increased permeability is not necessarily associated with decreased weather resistance.


    The ability of a material to reflect light is quantified by its "reflectivity." Reflectivity is measured as a percentage from 0 to 100%, with anything above 85% being considered excellent.

    As opposed to more common dark roofing materials, white roofing coating techniques reflect 80-90% of the thermal light back into the atmosphere, greatly minimising the potential for heat absorption on the roof itself.


    The term "emissivity" is used to describe a capacity of the concrete to emit thermal energy. The optimal value for an elastomer roof coating is 0.65, with values between 0 and 1 being deemed acceptable.

    By reflecting the sun's heat from the roof, buildings can reduce their cooling needs and save money.

    Volume Of Solids

    To determine how much of a substance will remain as solids after drying, we look at its solids by volume.

    In order to correctly attain the required dry wall thickness specified for specific coating systems, an understanding of this attribute is crucial.

    This feature is interesting to think about, but it has no influence on how well a coating performs.

    There are other metrics to think about besides the physical properties I just mentioned, which are the most important ones in terms of performance.

    It is possible to apply any of the discussed coatings on your flat roof; nevertheless, some will serve you better than others.

    A roofing expert should be consulted for advise on which coating is ideal for a certain roof. Investing in a roof coating is usually a good idea because of the many advantages it can provide.


    A roof coating could be the greatest choice for a structure in this era of rising labour costs and ecological consciousness. By blocking the sun's harmful UV rays, a coating can save heating and cooling costs. In addition, it lessens the chances of the underlying membrane failing due to expansion and contraction. Flat roofs are typically advised to use silicone roofing treatments such as Gaco S-2000 Roofing Coating. Because of how far a tiny bit goes, you can get away with using much less of this material than you would with acrylic coatings. Another common option for rehabilitating roofs is asphalt emulsions, commonly called emulsified asphalt.

    Content Summary

    1. A roof coating could be the greatest choice for a structure in this era of rising labour costs and ecological consciousness.
    2. Energy costs can be reduced because to the coating's ability to act as a shield against the sun's harmful UV rays and keep the roof from expanding and contracting as a result of weather.
    3. Roofing coatings can be a cost-effective alternative to full replacement.
    4. Architectures of the Roof There are a number of positive outcomes that can occur once a roof is coated.
    5. Coverings for roofs are essential for maintaining an agreeable temperature within a building.
    6. With a roof coating, you can add years to the life of your roof, and if that isn't enough, you can always get a new coating.
    7. Flat roofs are typically advised to use silicone roofing treatments such as Gaco S-2000 Roofing Coating.
    8. While some acrylic-based coatings can soak up water, silicone cannot because of its natural resistance to moisture and humidity.
    9. Lime-Infused Cement Concrete roofs are best coated with an elastomeric material comprised of silicone, such as acrylic or urethane.
    10. Consider these four choices for a roof coating before making your final decision.
    11. Acrylic is a low-cost material that can be used for many different types of roofing.
    12. Acrylic roof coatings use multiple types of acrylic polymer to improve durability and lengthen the coating's lifespan.
    13. Bitumen Emulsions If you need to restore your roof, asphalt emulsion is another common option.

    Frequently Asked Questions About Roof Coating

    Sprayed Polyurethane Foam, also known as SPF, is among the longest-lasting roofing systems. Many SPF roofing systems have endured for over 50 years with few signs of failure.

    Many factors can affect the longevity of an elastomeric coating, but mil for mil, silicones last longer than acrylics. This is mostly due to the inherently superior UV and moisture resistance of silicone materials.

    White – White roof coatings are the most reflective, and they can reflect up to 90% of the ultraviolet light from the sun. This helps keep your home cooler when it's hot outside and can save you money on energy costs.

    Silicone is extremely weatherproof, and it is the best material for resisting hardening and embrittling. This is why it is the very best option for dealing with pondering. Any roof with ponding issues will prefer a silicone coating — especially in those areas.

    between 10 and 20 years

    Elastomeric roof coatings can last between 10 and 20 years, depending on the initial application thickness. For the longest life possible, it's recommended that the roof undergoes an annual inspection and maintenance.

    Leave a Comment

    Your email address will not be published. Required fields are marked *

    Scroll to Top