Roof Coatings Provide Seamless Waterproofing
- AcryShield roof coatings are tailored to fit your buildings
needs exactly.
- Proven for over 30 years to stop leaks!
- AcryShield coatings provide additional layers of waterproofing, superior adhesion to your existing roof membrane, and resistance to ponded water.
AcryShield Coatings are Sustainable
- Engineered to last for decades.
- Renewable indefinitely - AcryShield coatings, due to their light-weight nature, aren't classified as a new roof system within city rules and regulations; therefore, they don't fall into the same restrictions which require you to tear-off your roof after the second roof was applied - allowing you to re-coat your roof indefinitely throughout the life-span of your building.
National Coatings has Non-Intrusive, Fast 
Application Process
- No drilling, nailing, or seam-welding is necessary - minimizing installation disruption.
- Excellent for clean rooms! Our application techniques limit the vibration on the roof. This keeps dust from falling out of the existing roof structure, keeping the facilities interior clean.
- AcryShield roof coatings do not contain harmful or strong odors.
- Installation occurs directly on top of existing roof - avoiding time-consuming roof tear-off and replacement.
AcryShield Roof Coatings are Environmentally Friendly
- Cool Roof technology allows for UV rays to reflect away from your building, lowering energy consumption in the building.
- Reducing urban heat island in the surround city, improving the health of the people in the surrounding area.
- AcryShield coatings avoid the need to do a tear-off of the existing roof substrate; therefore, alleviating more congestion to our landfills which are destroying the environment.
Cost Savings
- AcryShield coatings can save you 50-70% less money than replacing your entire roof.
- No need to close your business during renovation.
- Energy savings.
- Reduced life-cycle costs. (Check out our article on Life Cycle Cost Analysis Using Roof Coatings )
- Reduced roof maintenance costs.
DIRECTIONS FOR USE:
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Press gauge into wet elastomeric roof coating.
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Withdraw vertically and note deepest tooth having paint on it and the next higher tooth that is not coated with paint.
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The true wet film thickness lies between these two readings. Clean gauge after each use.
DETERMINING THE DRY FILM THICKNESS (DFT) AFTER FINDING THE WET FILM THICKNESS:
Many roofing specifications and warranty policies call out for a certain number of dry film thickness mils to be required on a job. The wet mil gauge gives you one of the numbers needed in the formula to determining the dry film thickness. The other number you will need to know is the volume solids of the elastomeric roof coating. Here is the formula:
Wet Film Thickness x Percent Volume Solids = Dry Film Thickness (DFT)
Let’s use a specification from National Coatings as an example. The specification calls for 24 mils DFT of elastomeric roof coating AcryShield A503 base coat & AcryShield A400 top coat. Let’s first take the AcryShield A503 base coat. It has a 54% solids material – the contractor will need to apply 1 ½ gallons (these quantities are based on perfect conditions, perfect spray equipment, no wind, etc…see "Things to Consider” below) per square to achieve approximately 24 wet mils. Using the formula above we will take 24 and multiply it by 0.54 to find out the DFT equals 12.96. When the base coat is dry, the AcryShield A400 top coat will also need to be sprayed at 1 ½ gallons per square to reach 24 wet mils. This top coat has a 52% volume solids content, so we will take 24 mils and multiply it by 0.52 to find out that the DFT equals 12.48. When you add the 12.96 DFT of base coat and 12.48 DFT of top coat, you are left with a roof membrane that is 25.44 mils DFT which slightly exceeds the specifications requirement of 24 mils DFT.
THINGS TO CONSIDER:
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When measuring the wet film thickness, you must do so immediately after the application of the roof coating. If the coating has a high concentration of volatile solvents (liquids that vaporize at room temperature), they will evaporate immediately giving a false reading.
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Wind Loss: Winds up to 20 miles per hour, you may lose 20%-30% of the coating required.
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Miscellaneous Loss: Add between 3% to 10% to the total coating required (extra coating required due to lapping of the coating between passes and coating trapped in the lines and in the empty pail/drum)
Coating metal roofs using the AcryShield Roof Maintenance System, ARM (see diagram), is relatively easy. But first, it is vitally important that the roof be evaluated for the type of metal and original coating used (if any).
If the roof is not coated, it is important to know the metal type. If the roof is galvanized steel, aluminum, or Galvalume, the roof can easily be coated after a thorough pressure wash, rinse and drying. Weathering of these metals causes a tough "scale" to develop on the surface which actually increases the adhesion of the coating to the metal. Two coats of AcryShield A510 (excellent for coating metal roofs) are then applied.
If the roof is steel and there is no "red rust" (iron oxide), then the roof can be coated as above. However, if there is "red rust" present, this must be removed with a wire brush or wire wheel fitted to an electric drill. After the rust is removed and wiped clean, RustShield A120 primer is immediately applied. The RustShield primer, made specifically for coating metal roofs, contains a unique additive that prevents "flash rusting", discoloration of the coating due to the fresh steel's chemical reaction with the waterborne coating.
If the metal had been previously coated, the roof is first cleaned as in the uncoated metal coating procedure above, and then coated with the AcryShield coatings. One key distinction: If the coating is Kynar or other PVDF coating chemistry, then AcryShield A130 normally recommended for coating PVC roofing is applied at 0.5 gallons/ SQ. This acts as a primer to provide adequate adhesion of the AcryShield topcoat to the underlying coated metal.
Details, Seams and Penetrations:
After cleaning, details such as fasteners, penetrations, lap seams and standing seams are made watertight using butyl caps (applied to exposed fasteners) and butyl tape applied to lap and standing seams. As an alternative, AcryFlex A150/151 and polyester mesh T272 can be applied to seams.
For additional information, call us at 800-423-9557 or email info@nationalcoatings.com
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Installing a white roof with a high quality elastomeric roof coating will greatly benefit your building and the people inside it. To begin this selection process, it is crucial to understand two things:
- How to figure out what determines a high quality coating
- Understanding the importance and benefits of selecting a high quality coating
Determining a High Quality Roof Coating
The Cool Roof Rating Council does an excellent job providing accurate and credible, independent test results of different roof coating manufacturers’ products. The three main components they measure are solar reflectance, thermal emittance, and a combination of the two called Solar Reflective Index (SRI). Solar reflectance is the amount of solar energy/UV rays that is reflected away from the roof, back into the atmosphere. The higher the solar reflectance is of a coating, the less heat the building has a chance to absorb. Thermal emittance is the relative ability of a roof to emit (or release) heat that has been absorbed. SRI is a calculation method using reflectance and emittance values to determine the roof’s overall capacity to refuse solar heat. Therefore, the higher the SRI value is, the greater ability the coating has to reject solar heat absorption, maintaining a cooler temperature inside the building. While it is important to take note of the initial solar reflectance and SRI values, you don’t want to be influenced too greatly by these initial values. The more valuable testing results will be the long-term success rates, or the 3 year, aged testing results. The 3 year test results will give you a greater sense of the quality of the roof coating and how it will perform in the future. While inferior coatings will often say “we are the same as…” these 3 year values can show different chemistries and the quality of ingredients in the coating. When installing a white roof on your building, who wouldn’t want to use the coating with the greatest long-term performance history!
Benefits of a Choosing Highly Performance Roof Coating
Now that you know a top quality roof coating will have high aged reflectance, thermal emittance and SRI values, let’s dig in a little deeper to find out how that affects the building owner and those inside the building. As stated above, the higher the SRI value, the more likely the temperature of the roof will be slightly above the ambient outside temperature resulting in a “cool roof”. The cooler roof temperature limits the heat that is conducted from the outside of the building to the inside. With less heat transferring through the roof into the building, the cooler the inside of the buildings stays, making it significantly beneficial for the person responsible for paying the cost of the electric bill. White roof coatings can substantially lower air conditioning costs and prolong the mechanical systems operational life expectancy. Employees, customers, and everyone else who enters your building will benefit from the cooler temperature!
Proven Performance
National Coatings manufactured an AcryPly® Roof Restoration System which was installed on Harbor Freight Tools, 260,000 square foot roof and this was what they had to say: “After the National Coatings’ Cool Roof was installed we definitely noticed a difference in building temperature. It's not a marginal difference, either. It is now between 15° to 20° degrees cooler inside the warehouse and store.” – Jerry Moore, Facilities Director at Harbor Freight Tools
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Dark surfaced membranes, such as modified bitumen roofing substrates, absorb a majority of the sun’s UV rays generating excessive heat on the roofs surface. This heat gain can cause several damaging effects to your modified bitumen roofing membrane, including: premature aging, splitting and cracking, blistering, and overall brittleness of the membrane. These symptoms are the primary cause your roof begins to leak.
The Good News
Thankfully, if caught before irreversible damage has occurred, these destructive results are easily fixed with a high quality elastomeric roof coating. National Coatings has specifically formulated asphaltic roof coatings for modified bitumen roofing membranes. These coatings have unique bleed-blocking properties leaving your newly coated roof, exceptionally white and highly reflective, protecting your roof from the sun’s harsh UV rays.
Maintain or Restore Your Roof
Depending on the condition of your roof, a roofing contractor can either install a roof maintenance system, such as an AcryShield Roof Management (ARM) System or a roof restoration system, such as an AcryPly Roofing System. The ARM system
(shown below) for modified bitumen roofing substrates uses a base coat directly over your existing roof. Customized local reinforcement is put in place in areas where extra support is needed. Then the highly reflective, bleed-blocking top coat is sprayed over the entire roof surface. This imbeds the local reinforcement in-between the base and top coats, giving your roof the strength and protection it needs in those areas that have extra damage.
The AcryPly Roofing System (shown below) for modified bitumen roofing substrates is an excellent alternative to a roof tear-off and provides needed reinforcement across the entire roof substrate. This 
system uses a base coat over the existing roof, followed by LiquiSeal asphalt emulsion, which fills in any cracks and voids, providing an added level of waterproofing and an excellent foundation upon which to build the balance of the membrane. Then polyester fabric is rolled out over the entire roof substrate for an extremely durable reinforcement layer. Next, the base coat is sprayed, allowing the fabric to be fully imbedded in-between the LiquiSeal and base coat, providing strength and support to your damaged roof. Finally the highly reflective, bleed-blocking top coat is sprayed, leaving you with a fully-reinforced, custom installed roof that eliminates the need for a costly tear-off.
Greatest Benefits of Coating an Existing Modified Bitumen Roofing Substrate
These roofing systems are 100% waterproof, renewable, and sustainable. They are installed on the exterior of your building with minimal noise disruption to your facilities daily environment. You can re-coat your roof several times without ever having to tear the roof off, saving you a great deal of money and allowing your business to stay open during renovation. For a FREE Roof Evaluation, click here or the button below!
