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18 ROOF COATINGS 2017 COATINGSPROMAG.COM traditionally black or gray, the benefits of white roofs. You can extend performance, i.e., waterproofing, and get energy efficiency — all in one fell swoop." e drawback to the elastomeric products, however, is that they do not do well with ponding water. ese water-borne elastomerics need slope to function well or else the coating could deteriorate prematurely. In turn, this is opening the door for silicone coatings on flat or low-slope projects. "Silicone coatings have taken off," Rust-Oleum's Gibbons said. "ey're typically a white color, but it's a more premium product. It's going to be more expensive than elastomeric, but the warranties are also longer. For someone who is doing a restoration job and saying 'I want to do this right, I don't want to touch it for a long time,' they're going to go to silicone." For contractors without the budget for silicone coatings, though, Gibbons added that aluminum roof coatings also offer some reflective properties. "A luminum is one of the best values out there in regard to lower cost," Gibbons said. "With our product, you don't even need a primer. ere are roofs that have had aluminum coatings that have been out there for 30 years and are still holding up great." Another possibility is applying polyurethane coatings on top of SPF. "A roofing system gaining market share due to simplicity, ease of application over existing systems, and energy savings is the combination of SPF and a polyurethane topcoat," said Covestro's Reinstadtler. "e SPF is applied at 1‒4 inches [2.5‒10.2 cm] over existing substrates, such as a standing seam metal roof, aged single-ply, bitumen-based BUR, or other systems, including acrylic. en the SPF is top-coated with an aromatic or aliphatic polyurethane roof coating to protect and seal. e SPF adheres well to a variety of substrates, seals the surface during expansion, and can create the necessary slope for drains or scuppers. e topcoat provides mechanical and environmental protection for the system and another layer that resists the ingress of water." According to Reinstadtler, plural component polyure- thane roof coatings are gaining market share over older technologies, such as bitumen-based systems, in part because of benefits including lower odor and volatile organic compound (VOC) levels. e Elastomeric Roofing (ER) Systems brand of Illinois Tool Works (ITW) Polymers Sealants North America is also a major player in the polyurethanes space, having recently introduced its Polyurethane 300 restoration system with both an aromatic basecoat and aliphatic finish coat. "e system combines a proven aromatic basecoat with over 10 years of performance history with a new aliphatic finish coat designed to be physically superior to anything else in the market," said ITW 's Marketing Supervisor NaYeon Park. In some cases, to fully preserve the environmental benefits, manufacturers are also taking a more active role in the application processes for these coatings. For example, VFI recently partnered with contractor A&Z Roofing to launch a " how to" video on the best methods to apply its silicone system to a single-ply roof. Best Practices, Standards Even while considering the numerous options for materials and application techniques, contractors must also recognize the importance of remaining in compliance with various roofing standards and best practices. For instance, regula- tions limiting the presence of VOCs continue to expand in many areas of the country, and roofing contractors should be aware of not just national codes but local codes as well. "With VOC regulations becoming stricter, the need for lower emitting products has increased," said Garland 's Stuewe. "Manufacturers are now being forced to adjust to this new market factor and will need to adapt to survive. e most successful roof coating manufacturers are beginning to formulate low-VOC alternative products in conjunction with their traditional offerings to satisfy the evolving needs and preferences of their customers." Stuewe cited Garland 's Energizer LO, a fast-curing, asphaltic polyurethane system utilizing a low-odor, liquid-applied membrane, as an example of one of these low-VOC products. On the job, associations such as RCMA and the National Roofing Contractors Association (NRC A) can be valuable resources for proper practices. Issued by NRC A, The NRC A Roofing Manual: Steep-Slope Roof Systems — 2017 is the latest annual volume of the group's leading technical publication for the U.S. roofing industry. e 2017 volume includes five sections on asphalt shingle, clay and concrete, metal shingle Roof Coating Systems continued on page 20 Roof Coating Systems Organizations such as Roof Coatings Manufacturers Association (RCMA) and the National Roofing Contractors Association (NRCA) can help the contractor stay on top of industry-wide updates, such as volatile organic compound (VOC) regulations.

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