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COATINGSPRO ROOF COATINGS 2017 17 impact resistant, allowing them to handle traffic better than most other coatings. Polyurethane coatings are either aromatic or aliphatic. e former are less expensive and not UV stable, while the latter are UV stable, hold color well, and stay cleaner than many other coatings, according to GAF. On many jobs, a urethane coating system uses an aromatic basecoat and an aliphatic topcoat, which provides a durable, clean finish that is more resistant to ponding water than an acrylic system. However, as with silicones, they are also more expensive than acrylics. "e aliphatic roof coating technology exhibits tough- ness expected from a polyurethane-based system, which allows the coating to resist foot traffic from maintenance personnel or the errant hail storm," said Steven Reinstadtler, construction market manager for coatings, adhesives, and sealants at Covestro, which provides raw materials and technology for those sectors and the SPF industry. He added that polyurethane roof coatings also possess quicker cure times. Other potential selections include epoxies, thermal insulation coatings (TICs), polyureas, and aluminum. e odor of each choice may also be considered, since that could determine whether a project can be completed while a build- ing is still occupied. is is a key factor for roofing contractors since most projects involve buildings that are currently used. "Liquid-applied roofing projects are continuing to increase as older buildings are being retrofitted and upgraded to meet new regulations and building codes," said Doug Kramer, CEO of coatings manufacturer Lapolla Industries. Industry companies that manufacture roofing systems involving these coatings and/or SPF include American WeatherStar, Gaco Western (now part of Firestone Building Products), GAF, Gardner-Gibson, Garland, K ARNAK, Kemper System, Lapolla, National Coatings, Polyglass, RM Lucas, and Volatile Free, Inc. (VFI). "Green" Trends In many cases, environmental benefits can tip the scale when it comes to the choice of material for a given job. After all, environmentalism is often at the heart of roof coating jobs, given the significant benefits offered relative to tearing off the existing roof. "Energy efficiency is definitely the biggest trend in the roof coatings world," said Rust-Oleum's Gibbons. "e brighter the color of your coating, the more reflectivity you get, and that's when you get your energy efficiency." "If you have an existing roof, turning that roof into a white roof can have so many energy efficiency benefits," explained Kemper System's Arnold. "A white roof has a solar reflective index rating, which represents the deflec- tion of both light and heat. For the building, it cools the inside because you're cooling that roof surface — often from 150 °F [65.6 °C] for a black roof to 100‒120 °F [37.8‒48.9 °C] for a white roof. e HVAC [heating, ventilation, and air conditioning] units don't have to work as hard, and you can run smaller HVAC systems. ere are so many building efficiency benefits." Another benefit is reducing the "urban heat island " effect. "Studies show downtown areas of cities can be many degrees hotter than suburban areas covered in grass and trees," Arnold said. "So how can we cool down the urban core? By using white roofing to reflect heat." Both Arnold and Gibbons believe white elastomeric coatings and silicones are driving the industry's growth. "e industry is on a multi-year growth spurt centered on white elastomeric roof coatings," Kemper System's Arnold said. "at's the growth segment. It's to give aged roofs, Roof Coating Systems "Green," aka environmentally friendly or sustainable, is still a gold standard for roof coatings. Applying a new white coating, such as from The Garland Company, can make the roof and building more energy efficient. "Liquid-applied roofing projects are continuing to increase as older buildings are being retrofitted and upgraded to meet new regulations and building codes," said Doug Kramer, CEO of Lapolla Industries.

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