National Coatings Blog

Metal Roof Coating Systems Permit Restoration of Degraded Metal Roofs

Posted by Nicole Gale on Thu, Apr 09, 2015 @ 11:30 AM

028Metal roofing has a reputation of being an extremely durable roofing substrate that has been successfully used on buildings for over 70 years.  Many warehouses, agricultural facilities, food processing, heavy equipment manufacturing, schools and now churches use metal roofing as they provide excellent strength with heavier gauge steel, speedy installation and lower upfront costs over traditional roofing systems. Extending the life of an aged metal roof by using a metal roof coating system is a viable and excellent option as opposed to the other available options of single ply membrane retrofits, roof hugger systems (additional metal layover of the existing metal panel) or the most expensive and disruptive complete removal and re-skin option with all new metal.  Recoating metal roofs can lower roof maintenance and prolong the lifespan of the roof indefinitely, when maintained properly.

As a metal roof ages, the factory applied coating be it galvanized, baked on paint, Kynar or even Anodized protection of the metal panels deteriorate, fasteners break, seams fail, and rust occurs. When the protective coatings that are baked onto the metal panels during manufacturing have worn off, the panels are exposed to environmental elements making them vulnerable to roof failures. The fasteners, which hold the panels together, deteriorate over time and begin failing due to the roof constantly expanding and contracting. This occurs due to normal every day temperature fluctuations and are increased drastically when there are sudden swings in temperature such as a cold fronts, hail impact and rain cooling off of a heated surface in the summer when temperatures of the panel can be in excess of 150+ degrees. These broken fasteners and open seams occur due to stress related exposure and become avenues for water that will surely penetrate the system and enter the building’s interior. Sealants, tapes and caulks that have no UV protection commonly used to waterproof joints and areas between the panels, lose their elongation and recovery abilities, making it difficult to keep up with the buildings‘ constant movement without weakening. Screws and washers become loose and fall off, needing inspection, tightening and replacement. Metal panels can develop rust, needing either full replacement of the panel or the use of a special rust inhibitive primer to restore the panels. The application of rust inhibiting primers are commonly left unprotected and eventually fail. The most common repair material used is asphaltic mastics and should never be used as it is not even meant to be applied directly to a metal panel and must be removed prior to any application of an approved coating for these metal structures.

Recoating a deteriorating metal roof using one of our AcryShield Metal Roof Coating Systems will allow you to solve all the issues mentioned above and leave you with a fully restored, watertight, maintainable and sustainable roofing assembly.

Restoring the roof involves the removal of rusted panels by cutting out the areas that have fully rusted through the panels and replaced with new and like profile to the original so as to promote a solid and continuous seal to the original panel(s). Our low VOC primer, RustShield is then applied to fully combat future rusting of the panels. The AcryShield System offers a choice depending on the severity of degradation to the existing metal. A butyl tape with cloth backing can be applied over all seams and around the base of penetrations, curbs and flashings for a fully sealed and watertight substrate. Screw heads can be encapsulated with either a trowel grade or brush grade AcryFlex mastic and if warranted due to extreme movement/failure a 3-course application of mastic and membrane can also be used to negate future expansion and contraction issues in lieu of the butyl tapes. Next, a base coat with excellent adhesion to metal is installed for exceptional waterproofing. Finally a finish coat containing an industry leading UV protection package is applied. The end result is an easily maintainable and renewable solution that provides long-term performance and low life-cycle cost, along with the added bonus of increased energy efficiency. 

Download our FREE Metal Roof Coating Systems Brochure for additional information or call us at 800-423-9557.

FREE GUIDE: Metal Roof Coating Systems

Tags: Metal Roofing Systems, Metal Roof, Metal Roof Paint, Restore Metal Roof

Why the US Coast Guard Choose AcryShield Metal Roof Coatings

Posted by Nicole Gale on Tue, Sep 02, 2014 @ 01:00 PM

004The United States Coast Guard hangar at the Los Angeles Airport (LAX) was worn and aging. Facility maintenance employees were looking for a long-term solution that would provide cost savings, Title-24 approval, energy efficiency and they wanted to avoid a costly and timely roof replacement.

The 39,300 square foot hangar had several challenges that needed to be met. There were metal panels that required repair and maintenance. There were sections where rust needed to be removed, replaced and re-coated with a rust-inhibitive acrylic primer – RustShield A120. This ensured proper preparation of the rusted surfaces in order to provide excellent resistance and protection against flash rusting and corrosion. The hangar also required a durable coating that could withstand updraft from helicopter rotor blades during take off and landing.

National Coatings provided the US Coast Guard with the AcryShield® Roof Management (ARM) System along with the replacement and re-coating (RustShield A120) of heavily rusted sections. The metal roof coatings used in the ARM System provided additional protection to the metal roof from the harsh conditions of jet fuel and salt water in the air from the nearby ocean. The white reflective topcoat was Title-24 compliant and provided the US Coast Guard with a cooler temperature inside the large metal hangar.  036The AcryShield metal roof coatings are able to to reflect a majority of the heat away from the structure, prohibiting the building from absorbing much of the sun’s heat, resulting in a cooler environment inside the building. The US Coast Guard was pleased with their decision to use metal roof coatings to restore their hangar opposed to a full roof replacement which would have been much more costly and time intensive.

The AcryShield Roof Management System allowed the US Coast Guard to maintain their existing roof, eliminating any tear-off costs and loss of time due to tear-off procedures. This metal roof coatings system provided a sustainable and renewable solution allowing the US Coast Guard to extend their roof service life and lower roof maintenance costs indefinitely.

FREE GUIDE: Metal Roof Coating Systems

For more information on metal roof coatings or systems, download our FREE METAL COATING GUIDE!

Tags: Coating Metal Roofs, Metal Roofs, Metal Roof Coating Systems, Metal Roof Coating, Metal Roofing Systems, Metal Roof, Metal Roof Paint, Restore Metal Roof

Downside to Aluminum Roof Paint (aka Coating)

Posted by Nicole Gale on Tue, Jul 01, 2014 @ 12:00 PM

Aluminum Roof Paint When considering a roofing system for your commercial roof, longevity, waterproofing, sustainability and durability are all necessary and important factors to research. While aluminum roof paint can provide durability and waterproofing, it poses some issues with sustainability and longevity. 

What is Aluminum Roof Paint

Aluminum roof coatings are solvent based formulated with asphalt, aluminum paste, moisture scavenger, fillers and hydrocarbon solvents. High quality aluminum roof paint options will contain high amounts of aluminum pigment to increase the reflectivity values.  ASTM D2824 –Standard Specification for Aluminum Pigmented Asphalt Roof Coatings provides resources and assistance in selecting an aluminum roof coating that is suitable for roofing applications.

Downside to Aluminum Roof Paint

FREE GUIDE:  Restore Your Aging  Roof with SiliconeThe greatest issue we have with aluminum roof coatings is its inability to adhere to other waterborne and acrylic roof coating systems in the future. This hinders its ability to be easily sustainable and renewable.  The aluminum flakes in the coating interfere with adhesion, making delamination a potential issue, increasing roof failures from occurring. Solvent-based primers can be used to support adhesion to the aluminum flakes; however, the bond between the coating and primer can still cause issues and many roof coating manufacturers shy away from the idea. We recommend contacting the roof coating manufacturer before construction begins.

Unlike acrylic coatings, aluminum coatings do not provide any waterproofing properties. They do increase reflectivity and UV protection to the roof substrate but do not improve appreciable mil thickness to the roof.  Acrylic roof coatings form a seamless, monolithic membrane when applied, creating a watertight, durable roofing substrate. Lastly, due to aluminum coatings being solvent based, they are typically higher in Volatile Organic Content VOC’s, causing unpleasant and potentially harmful odors during application. (Click here for more information on low VOC Roof Products).  

Roof coatings or roof paints are continually increasing in popularity because of their ability to be restored and renewed the current roof. They provide lower life-cycle costs, fewer disruptions to your business, lower roof maintenance costs and less hassle compared to traditional roof replacement. The sustainability factor for these roof-coating systems offer great over-all value and provides you with excellent longevity to your roof substrate.  

National Coatings offers sustainable roof restoration and roof maintenance systems that provide ultra-high reflectivity, durability, waterproofing, as well as, sustainability. All of our elastomeric roof coatings systems can be renewed, allowing you to extend your roof’s service life indefinitely.

To find out more about renewing your current roofing substrate and avoid a costly and timely roof tear-off, download our Full Line Brochure or check out our individual substrate brochures:

Commercial Roofing Contractors

Tags: Roof Systems, Coating Systems, Roof System, Coating System, Roof Restoration, Roof Maintenance, Commercial Roofing, Metal Roof Coating, Metal Roofing Systems, Metal Roof, roof repairs, Metal Roof Paint, roof restoration system, aluminum roof coating, aluminum roof paint, aluminum coating