CoatingsPro Magazine

MAY 2018

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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60 MAY 2018 COATINGSPROMAG.COM walls were put down with a self-adhering granulated capsheet, Carruth said, with a glass base sheet nailed to the wood deck with fasteners and plates. Meanwhile, blisters and membrane failures were cut out with a razor knife before applying a heat-welded material to make it "tight with the old roof," he explained. New Silicone Blows In Adjusting on the fly to the evolving surface preparation needs was the hard part of the project — and also the longest. So when it came to the final 10 days of work on the ~45,000 square feet (4,180.6 m2), the Advanced Roofing crew felt like the wind was at their back! Tropical 's #996 Eterna-Sil Premium Asphalt Bleed Blocker was the primer of choice for the new system, applied with a Graco GMax 7900 sprayer at a rate of 0.75 to 1 gallons (2.8–3.8 L) per 100 square feet (9.3 m²). Low in volatile organic compounds (VOCs), the fast-drying, water-borne product is designed specifically to prevent bleed-through when applying silicone coating systems over asphalt substrates. "It provides a bite for the silicone to stick to," Carruth explained, adding that the primer requires about 24 hours to cure. In addition to the 996, Tropical 's #9100 Eterna-Sil Premium Silicone Multi-Purpose Mastic was also applied to all vertical penetrations and fasteners prior to the installation of the silicone. at layer was applied by brush. "at's where we tied into the existing roof that didn't have failures," Carruth said. "e verticals would get a three-course method with the roof mastic and an asphalt fabric tie-in with where the wall didn't blow off. e new membrane and glass sheet would tie into it. It's a brush-grade material, and you do it around the bottom where the penetrations come in." Upon curing, the #9100 forms a durable, breathable, and weatherproof barrier that is highly resistant to degradation from ultraviolet (UV) light and natural weathering, according to the manufacturer. With the primer and mastic in place, the crew was finally able to apply the silicone of choice: Tropical 's #914P Eterna-Sil Premium 100 percent Silicone Roof Coating. Described as an elastomeric membrane exhibiting strong weathering water resistance, the product was applied with the Graco sprayer at a rate of 2.5 gallons (9.5 L) per 100 square feet (9.3 m²) over the entire roof surface. In intricate areas where the sprayer couldn't reach, crew members used a 13-inch (33 cm) roller to apply the silicone, which takes ~72 hours to fully cure. In the coating phase, the presence of the six-man crew allowed some overlap on the two condo roofs since each roof only required three workers for the application. "We'd have one guy on the ground [with the material] and two on the roofs," Carruth explained. "It takes one guy to manipulate the hose, and the other is the applicator." at allowed the other three workers to begin the process on the other roof. W hile work on the condo roofs was the highest elevation on the project, high winds from Florida's usual beachfront condi- tions surprisingly turned out not to be a major headwind for the sprayers on this job. "e parapet walls were 4 or 5 feet [1.2 or 1.5 m] high, so the wind would hit the side of the building and then come up and over the top," Carruth said. "It didn't affect us on the main roofs as much as you'd think it would." It was a different story on the tops of the smaller garages below, which the crew coated using the same method as the condo roofs on the final two days of the project. e elevation wasn't as high as on the condo roofs, and the garages didn't have parapet walls sticking up, which made wind more of a factor. "e wind was definitely a challenge there because it's right on the beach," Carruth said. "But the early morning was the best time to try to take advantage of [lower winds], so we adjusted our working times. We were still able to spray; we just had to be very delicate with it." Blisters and failures were removed before spray applying the new coating system: a spray-applied asphalt blocker, followed by a silicone mastic to vertical penetrations and fasteners and a silicone coating to all surfaces. The Advanced Roofing crew finished coating the roofs of the condo buildings and garages in about 7 weeks. Even Hurricane Irma couldn't keep them from succeeding on this rooftop. Green Roof Coatings

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