CoatingsPro Magazine

JAN 2013

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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JoB at a GlanCe "We power-washed the deck on the Sunday before we started surface prep and coating," says Nash. He and his crew needed to be finished with the job within five working days, so they took advantage of the slower vehicular and pedestrian traffic on the weekend to get a jump on the first step of the process. "Since the hospital never closes, the parking structure needed to remain open," Nash says. "The two lower levels were open even while we were doing work on the roof. We made sure that before anyone got to the roof access ramps that they were alerted to the third level closure." Once the deck was power-washed, the crew got down to the business of removing the existing top coat using a Clarke floor grinder. The deck was divided into three sections and each section was prepped, repaired (if necessary), primed, and coated before moving on to the next section. "The very last section was in the worst condition," says Nash. "It was the largest section and had the most traffic come across it, so it makes sense that it was the most damaged." In all the sections, the crew made concrete repairs as necessary before moving on to priming and coating. Depending on the severity of the cracks, the crew used gun-grade urethane, embedded carbon fiber tape, and/or caulking to bridge the gaps. tHree-Hour Cure With surface prep and repairs made, the crew was ready to apply the Polyprime U. Using squeegees and rollers, the Nash Deck crew applied the high-solids primer to the roof deck at 3 mils (76.2 microns), DFT. Under typical circumstances, Polyprime U should be coated within 12 hours after it has become tackfree; however, because of the extreme heat, the primer cured much faster. "We were able to apply the Poly-I-Gard 246SC within three hours after we laid down the primer," Nash explains. Poly-I-Gard 246SC is a single component, moisture-cured, aromatic polyurethane waterproof membrane. Poly-I-Gard 246SC PROJECT: Recoat top level and access ramps of Saddleback Memorial Medical Center parking structure using Polyprime U and Poly-I-Gard 246SC from Polycoat Products COATINGS CONTRACTOR: Nash Deck Coatings 33381 Stern Wave Dana Point, CA 92629 (714) 404-8681 SIZE OF CONTRACTOR: Two to ten employees, depending on the job PRIME CLIENT: Saddleback Memorial Medical Center SUBSTRATE: Concrete with an existing urethane base coat SIZE OF JOB: 15,000 square feet (139.35 m2) DURATION: Six days SIZE OF CREW: A crew of six worked this project UNUSUAL FACTORS/CHALLENGES: ¢ Southern California experienced an unusually hot and long-lasting heat wave during the job. Nash and his crew had to make adjustments to ensure that the project went smoothly even with the extreme heat ¢ Existing urethane top coat, applied very thinly, was peeling and flaking after only one-and-a-half years ¢ Sand had not been broadcast into existing coating system, making roof deck extremely slippery in wet conditions ¢ Although existing topcoat was damaged, the urethane base coat was usable, saving client time and the expense of having parking structure stripped down to bare concrete PROCESS: ¢ ¢ ¢ ¢ ¢ Power-wash roof deck area Remove existing top coat with floor grinder Repair concrete where necessary and caulk deck Squeegee and roll Polyprime U primer to achieve 3 mils (76.2 microns) DFT Pour and roll Poly-I-Gard 246SC at a thickness of approximately 10 mils (254 microns) DFT ¢ Broadcast Lapis Lustre 2/16 sand into wet coating ¢ In highest traffic areas, double broadcast sand to ensure excellent nonskid properties ¢ Pour and roll two final coats (10 mils/254 microns) of Poly-I-Gard 246SC 5 above Since the urethane base coat from the existing coating system was usable, the Nash crew was able to save their client the time and expense of having the affected areas stripped down to bare concrete. SAFETY CONSIDERATIONS: ¢ Follow all standard safety procedures and wear gloves, safety glasses, and dust masks when necessary January 2013 g www.coatingspromag.com 43

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