CoatingsPro Magazine

MAR 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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COATINGSPRO MARCH 2018 39 e crew slid ⅝-inch (1.6 cm) nap roller covers over their 9-inch (22.9 cm) rollers and laid down a single pass of Henry Pro-Grade 294 basecoat and sealer. e approximately 11 mils (279.4 microns) DFT of the single-component, water-based elastomeric sealer helps subsequent coats adhere better, but its primary role is to prevent "tobacco juicing." A lso called "tea staining," tobacco juicing refers to the leeching of brown-tinged modified bitumen into topcoats. "Asphalt oils tend to migrate upward through silicone coatings and form brown stains that look like tobacco juice or spilled tea," said ompson, who inspected the roof during all phases of coatings application. "e stains are purely cosmetic, but when you promise a white roof, you need to install a stain-blocking primer, otherwise ugly brown stains will appear over time." Next, the crew applied Henry Pro-Grade 923 (butter- grade silicone roof sealer) to seal the Flintlastic SA Cap seams. Working the sealant into the seams with 4-inch (10.2 cm) rollers and ⅝-inch (1.6 cm) nap covers, the crew applied approx- imately ⅛ inch (0.3 cm) DFT in a single pass and made sure that the coating extended at least 3 inches (7.6 cm) beyond each side of the seams. ey wore personal protective equipment (PPE) After the gravel and gravel stop were removed, the eight-person crew applied a modified bitumen membrane, ½-inch (1.3 cm) coverboard, a smooth top modified bitumen, and a granulated modified bitumen. The crew restored 46,000 sq. ft. (4,273.5 m²) with a coated system. They used a safety barrier 5 feet (1.5 m) from the roof's edge and a dedicated safety monitor when working outside that area. JOB AT A GLANCE PROJECT: Install a monolithic coating system on the roof of a multi-story condo- minium complex COATINGS CONTRACTOR: Florida Quality Roofing, Inc. 4317 NW 167th St. Miami Gardens, FL 33055 (305) 306-7663 SIZE OF CONTRACTOR: 25 employees SIZE OF CREW: 8 crew members PRIME CLIENT: Waterway East Condominiums 325 North Causeway New Smyrna Beach, FL 32169 SUBSTRATE: 1970s vintage built-up roof (BUR) CONDITION OF SUBSTRATE: Fair to poor with areas of substrate moisture saturation SIZE OF JOB: 46,000 sq. ft. (4,273.5 m²) DURATION: 7 weeks UNUSUAL FACTORS/CHALLENGES: » A slow-moving condo association substantially delayed project onset. » The crew had to fabricate a custom debris chute. » The crew lost 6 days due to inclement weather. MATERIALS/PROCESSES: » Removed gravel down to deck and perimeter gravel stop » Cut out moisture-damaged areas; replaced with new plywood » Applied modified bitumen membrane atop new plywood to bring level to existing BUR » Installed new 90 degree edge metal » Used 3-inch-round (7.6 cm) washers and screws; installed ½-inch (1.3 cm) Securerock pre-primed cover board » Installed CertainTeed Flintlastic SA MidPly (smooth top) modified bitumen » Installed CertainTeed Flintlastic SA Cap (granulated top) modified bitumen, ensuring seams don't overlap SA MidPly seams » Rolled a single ~11-mil (279.4 microns) dry film thickness (DFT) pass of Henry Pro-Grade 294 basecoat to entire roof » Rolled Pro-Grade 923 to seal Flintlastic SA Cap seams » Rolled two ~21-mil (533.4 microns) DFT coats of Henry Pro-Grade 988 silicone to achieve ~42-mil (1,066.8 microns) total DFT SAFETY CONSIDERATIONS: » Wore personal protective equipment (PPE), including gloves, face masks, coveralls, long sleeved shirts, eyewear, knee pads, and hats » Set up safety barrier 5 feet (1.5 m) from the roof's edge » Used a dedicated safety monitor when working outside the barrier

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