CoatingsPro Magazine Supplements

ROOF 2018

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22 ROOF COATINGS 2018 COATINGSPROMAG.COM at can be found on demand online at http://www.coating- spromag.com/webcasts. Covestro, which also provides raw materials and technology for those sectors and the SPF industry, is one of several companies offering these types of solutions. e polyurethanes division of global chemicals company BASF is another. Kemper System America provides reinforced polyure- thane roof systems among its higher-end options. Arnold noted that the company's liquid-applied coating technologies for the roof can also be extended down the walls, as liquid-ap- plied air barriers come into play as part of a broader building envelope solution. "If you're a roofing contractor installing coatings, you can probably migrate your business into the liquid-applied air barriers," said Kemper's Arnold. "ose prevent air leakage, which enhances more efficient building operations. Air barri- ers are being mandated in several states, and it's a big part of the LEED [Leadership in Energy and Environmental Design] program." Kemper's liquid-applied air barriers are known by the Wall Guardian brand. Other potential coating selections for roofing projects include epoxies, thermal insulation coatings (TICs), polyureas, polyaspartics, and aluminum. Several factors, such as odor, may also need to be considered, especially if the project is to be conducted while a building is still occupied. As for SPF products to be used on roofing substrates, notably closed- versus open-cell SPF, a variety of options can be found on the market. Companies such as American WeatherStar, BASF, Gaco Western, KM Coatings by Polyglass, National Coatings, and SWD Urethane are among the numer- ous providers. Application Techniques e final question for a contractor is often how to best apply the chosen coating. Depending on various factors, they can be applied by brush, roller, squeegee, or spray equipment, and sometimes in combination. On many projects, coatings on the larger areas of the roof will be spray applied for expedi- ency, while smaller nooks and crannies may require a brush or roller for the finer details. Additionally, the selection of the coating often dictates at least a portion of the application equipment. For instance, aforementioned 2K materials must be applied using plural component equipment that heats and mixes the products internally before being applied. PMC and SprayWorks Equipment are among the specialists in this space. For the spray application of coatings and SPF, one trend is toward increased automation. "ere are roofing robots now, like the Spraybot from SprayWorks, that have become very popular in the roofing world," said PMC's Mahaffey. "ose allow you to control your thickness. And in foam roofing, the other critical thing is applying it as smoothly as possible. e bumpier that surface is, the more coating it's going to require. And if you increase that surface area, you're increasing your coating cost." W hether the product is sprayed manually by a person or via robotic device, the material typically exits the chamber of a spray gun. One type of spray gun is the mechanical purge gun, such as PMC's PX-7. is type of gun incorporates a valving rod to mechanically purge the material from the mixing module at the end of each shot, which eliminates the need for solvent flushing or an air purge. e air purge guns are similar to the mechanical guns, except they purge the material from the mixing chamber and gun block using a quick blast of air. Instead of a fixed mixing and moving purge rod, the air purge guns utilize a moving mixing chamber. "e mechanical ones are more expensive up front, and there's more to learn to maintain mechanical purge guns properly," Mahaffey said. "It's a step above learning how to operate an air purge. at's what drove the industry toward air purge guns — easier maintenance and lower parts costs. But I think now you're seeing the trend come back some. Mechanical will give you the most complete mix. e advan- tages as far as flow, the longevity of how long you're spraying on a job before you need to do maintenance, and the way the valving rod guns apply the material I think are bringing the industry back around again." The type of coating may dictate the type of application used. For example, elastomerics, such as this one from Rust-Oleum, may be rolled on, while others may need to be brushed or squeegeed. Roofing Projects continued from page 17 Roofing Projects

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