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ROOF COATINGS OCT 2017

CoatingsPro offers an in-depth look at coatings based on case studies, successful business operation, new products, industry news, and the safe and profitable use of coatings and equipment.

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COATINGSPRO ROOF COATINGS 2017 23 for good water vapor transmission during extreme daily and seasonal environmental fluctuations. Safety is a major advantage: today's owners and occupants are often very concerned about chemical safety. Waste disposal, worker safety and training, cleanup, flammability concerns, storage and shipping rules, and ventilation requirements are all less cumbersome with acrylics. Silicones are known to provide a very inert and stable coating with superior water resistance. ey share many of the advantages of acrylics, including UV resistance, availabil- ity in light colors, and a high permeance. ey also provide better ponding water resistance and the ability to properly cure in thicker films, and they work extremely well in cold or wet conditions. ese characteristics have made silicone coatings the first choice when there's a concern that the coating may wash off due to challenging weather. e combination of excel- lent weathering and robust cure often means fewer coats are needed to achieve a system that provides a long service life. Urethane coatings, and more recently polyureas, have performed in some of the most demanding applications in the construction industry. ey are tough yet flexible; no other liquid-applied material can equal them for abrasion resistance or crack bridging capability. Polyureas used in roofing are a type of polyurethane that are designed to provide a rapid and less moisture-sensitive mode of cure. A polyurethane that's not reinforced can rival the performance of a fully reinforced system based on weaker materials. ey resist hail and traffic, and they are often used in high-rise applications or parking decks and plazas where these specific performance demands are greatest. The Must Haves Volatile organic compound (VOC) is the national and even county level regulation (California) of toxic or ozone pollut- ing emissions. Since a contractor's business may cover many counties or even multiple states, there is an advantage in adopting products that meet all the regulations they may work under. Both U.S. Green Building Council 's (USGBC) Leadership in Energy and Environmental Design (LEED) and the South Coast Air Quality Management District's (SC AQMD) Rule 1113 are currently at 50 g/L (0.4 lb./gal.). is favors acrylic and high-solids silicone coatings, which meet the rules and are also low odor. In general, VOC rules are more restrictive in more populated and sunny locations. Another must have is for the new coating to avoid changing the way a building works. Understanding the role of permeance in coating selection and building design is key, and its role cuts across all coating types. A number of less popular coating chemistries are used because they have very low permeance. Providing the proper permeance is why a Neoprene, butyl, coal tar urethane, asphalt, or So Many Coatings Volatile organic compounds (VOCs), Leadership in Energy and Environmental Design (LEED), and the South Coast Air Quality Management District (SCAQMD) may all need to be considered and followed for a roof coating project. A coating system, including those that include spray polyurethane foams (SPFs), shouldn't change the way a building works. Considering permanence and building design are key. Coating sub-types may be good options for projects that may offer challenges. A high-solids silicone, aliphatic polyurethane, hybrid polyureas, and premium acrylics are some options.

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