CoatingsPro Magazine

MAY 2015

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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Page 65 of 92

COATINGSPRO MAY 2015 65 the dew y surface using leaf blowers and mops. "After drying, we would do our prep work, including screwing down areas that may not of been properly attached or installing a gravel edge, or masking things of," Ezard said. Once all of the drying was done, they were usually ready to get the coatings going. Tat happened around 10 a.m. The Heat Is On With the weather f ina l ly on the crew's side, they got r ight into apply ing the coating system. But they had to keep it mov ing whi le the weather stayed war m; accord ing to Ezard, average temperatures in December are around 68° F (20° C), but cooler temperatures cou ld pose a problem for the applica- tion por tion of the job. Wear ing 3M masks, d isposable pants, and booties over their shoes, the crew worked in t wo teams to insta l l f irst the SPF and then the poly urea r ight behind. T hey even had separate self-contained mobi le trai lers for each t y pe of mater ia l w ith coord inating compressors f rom Chicago Pneumatic. T he larger of the t wo r igs a lso car r ied the sole generator, a 60 kW three-phase, d iesel machine by Perk ins Diesel. Using 300 -foot-long (91.4 m) hoses, the crew applied the SPF w ith Gusmer H20/30 Pros in two half-inch (1.3 cm) passes in "opposite directions for a more uniform coverage," explained Ezard. Wielding Graco's P2 Plural- Component A ir-Purge Gun w ith 03 mi xing chambers at 600 psi (4.1 MPa) and 130° F (54.4° C), they installed Oak R idge's OR FF 2.8 lb. (1.3 kg ) closed-cell foam. Te crew used the same strategy with the polyurea topcoat as they did with the SPF: Tey applied it in two coats in oppos- ing directions. Tis time, though, they used Graco P2 guns with 02 mixing chambers at around 1,200 psi (8.3 MPa) and 165° F (73.9° C). Te poylurea used was OR80SLM, which is a silver-colored, 100 percent solids material. It was applied to an Once they could finally start the coating system, they spray-applied ORFF 2.8 lb. (1.3 kg) closed-cell spray polyurethane foam (SPF) in two half-inch (1.3 cm) passes using Gusmer H20/30 Pros. JOB AT A GLANCE PROJECT: Apply spray polyurethane foam (SPF) and recoat a commercial roof on an 18-foot (5.5 m) tall building in Jacksonville, Fla. COATINGS CONTRACTOR: WeatherTight Installations 5497 East Lake Rd. Conesus, NY 14435 (585) 737-8900 SIZE OF CONTRACTOR: 6 employees SIZE OF CREW: 6 crew members PRIME CLIENT: C-III Capital Partners 5221 N O'Connor Blvd., #600 Irving, TX 75039 (972) 868-5300 SUBSTRATE: Concrete CONDITION OF SUBSTRATE: Poor; many leaks SIZE OF JOB: ~106,000 sq. ft. (9,848 m²) DURATION: 4–5 weeks UNUSUAL FACTORS/CHALLENGES: » The crew lived in New York and had to cut their Thanksgiving break short to return to the jobsite in Florida when excessive rain caused additional leaking » Weather caused several challenges, including high winds and dew on the substrate during the morning and evening MATERIALS/PROCESSES: » Prepped the substrate with power washing, removing all of the debris and old coatings, drying with leaf blowers and mops, screwing down detached areas, installing a gravel edge, and masking things off » Spray-applied ORFF 2.8 lb. (1.3 k g) closed-cell foam in two half-inch (1.3 cm) passes using Gusmer H20/30 Pros, Graco's P2 Plural- Component Air-Purge Gun, and 03 mixing chambers at 600 psi (4.1 MPa) and 130° F (54.4° C) » Spray-applied OR80SLM in two coats using Graco P2 guns with two mixing chambers at around 1,200 psi (8.3 MPa) and 165° F (73.9° C) to an approximate total dry film thickness (DFT) of 50 mils (1,270 microns) SAFETY CONSIDERATIONS: » Installed perimeter safety warning line system » Wore 3M masks, disposable pants, and booties over shoes » Used a "ground guy" to monitor safety and the materials in the mobile trailers, and communicated with him using two-way radios

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