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Issue link: http://coatingspromag.epubxp.com/i/101883
JoB at a GlanCe PROJECT: Apply reflective elastomeric coating to approximately one half of a 180,000-square-foot (16,722.55 m ) roof at an Arizona desert manufacturing plant COATINGS CONTRACTOR: Heat Guard Today 2020 Silver Creek Road Suite 105 D Bullhead City, AZ 86442 SIZE OF CONTRACTOR: A crew of five worked this project 5 above Pressure washing uncovered subtle hints of problems brought on by ponding and rusting near the roof's 250 fiberglass skylight panels and 150 swamp coolers. PRIME CLIENT: It took them approximately five man hours per unit to expose the original bare metal and to install the new materials to complete the proper pre-coating preparation. Normally, the next step would be to pressure-wash the rest of the rooftop with 1,500 psi (105.46 kilogram/cm2) machines. But the Heat Guard Today crew worried that the leaky roof might, well, leak into production areas below. That would be uncool! So the crew sealed all flashings, skylight panels, roof panel overlaps, and screw fasteners (about 10,000 of them!) with manufacturer-approved non-silica caulk. After hydroblasting, the Heat Guard Today team used generic brooms and vacuums to pick up rooftop debris, including dirt and loose roof cement. They deposited it into the on-site rolloff Dumpsters. Working one section at a time, the Heat Guard Today crew moved on to begin applying the first of two coats of SG-54. The SUBSTRATE: An Arizona plastic components manufacturer that prefers to remain unnamed Uncoated galvanized corrugated metal SUBSTRATE CONDITION: Fair to poor with ponding, rusting, and leaking SIZE: Approximately 90,000 square feet (8,361.27 m2) DURATION: About four months UNUSUAL FACTORS: ¢ ¢ ¢ ¢ Extreme heat and wind created curing and safety challenges Approximately 10,000 roof panel screws needed caulking Approximately 250 skylights needed prep and coating Approximately 150 swamp coolers needed prep and coating MATERIALS/PROCESS: ¢ ¢ ¢ ¢ ¢ Remove aged plastic roof cement from protrusions Remove and replace rusted corrugated metal Caulk roof panel screws Pressure-wash rooftop Roll on two coats of SG-54 Roof Reconditioning System elastomeric coating to achieve approximately 24 mils/609.60 microns (total DFT) SAFETY CONSIDERATIONS: 5 above What power washing didn't uncover, grinders did. It took on average five man hours per unit to expose the original bare metal and to install the new materials. ¢ Extreme heat ¢ Crew worked under portable awnings when practical ¢ Crew stayed hydrated, took frequent breaks, and avoided midday work in direct sunlight ¢ Crew wore fall protection when working near edge of roof January 2013 g www.coatingspromag.com 49