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54 JANUARY 2017 COATINGSPROMAG.COM Laboratory wind uplift rating as it is associated with the tenacious adhesion characteristics of the spray polyurethane foam system to be applied." e next step was to mask and protect all rooftop equip- ment, conduit, and other areas that could be impacted by the application. "Despite the complexity of the rooftop layout and the hundreds of components on the roof surface, we were able to leave all critical components and systems intact and function- ing, avoiding equipment damage and facilities interruption," Harvey said. en the team coated the entire existing roof system with a base application of PREMICOTE P-64, Plasticizer Migration Resistant Primer, manufactured by Premium Spray Products. e basecoat was applied at a rate of 0.5 gallons per 100 square feet (1.9 L per 9.3 m²). Using E-30 reactor based spray rigs, Fusion AP guns, and D guns (all by Graco), they next began installing 1.5 inches (3.81 cm) of Premium Spray Products' PREMISEAL 280, a 2.8-pound (1.3 kg) spray polyurethane foam, also called spray foam. "Beyond the air-sealing capabilities, the R-10 thermal insulation, this system does not utilize mechanical fasteners, and as such, is free of heat and cold syncs," Harvey said. e spray foam application was a very tricky process. Harvey and the Wedge Roofing crew had to come up with a method to put the spray foam onto the roof without removing the many components. "On any other roof system, those components would have been decommissioned," Harvey said. "at was absolutely not an option here, so we were forced to get creative." W hat they did was create a method to pre-apply spray foam to a rigid substrate, slide the substrate beneath the roof obstruction or conduit, and then integrate these components into the surrounding roof area. "is innovative process begins with carefully measur- ing the area, length, and width of the obstructions," Harvey said. "Next, we utilized the appropriately sized Oriented Strand Board (OSB) roof sheathing as the rigid substrate. After carefully masking off the perimeter 6 inches [15.2 cm] of each sheet, SPF was applied to one side of the OSB. is process was repeated until all of the required components were prefabricated." Low-rise adhesive was then applied to the areas where the foam was to be installed to achieve similar wind uplift charac- teristics. e perimeters of the OSB sheets were fastened with SPF Roofing Job VENDOR TEAM 3M Safety equipment manufacturer 3M Center St. Paul, MN 55144 (888) 364-3577 www.3m.com DeWalt Industrial Tool Co. Equipment manufacturer 701 E Joppa Rd. Towson, MD 21286 (410) 716-3900 www.dewalt.com Graco Inc. Equipment manufacturer 88 11th Ave. NE Minneapolis, MN 55413 (612) 623-6000 www.graco.com Lucas Products Material manufacturer 11105 Redwood Ave. Fontana, CA 92337 (909) 350-2285 www.lucasproducts.net Milwaukee Electric Tool Corporation Equipment manufacturer 13135 W Lisbon Rd. Brookfield, WI 53005 (800) 729-3878 www.milwaukeetool.com Premium Spray Products Coating and SPF manufacturer 1255 Kennestone Cir. Marietta, GA 30066 (770) 528-9556 www.premiumspray.com Tyvek by DuPont Safety equipment manufacturer 1007 Market St. Wilmington, DE 19898 (302) 774-1000 www.tyvek.com It wa s crucial for the crew to work carefully around p otentially hazardous areas, such as high temperature furnace exhaust vents. They were also sure to control access to the work area. Using Graco E-30 reactor based spray rigs, Fusion AP guns, and D guns, the crew installed an average of 1.5 inches (3.81 cm) of Premium Spray Products' PREMISEAL 280 SPF.