CoatingsPro Magazine

SEP 2015

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COATINGSPRO SEPTEMBER 2015 69 JOB AT A GLANCE PROJECT: Remediate five apartment buildings, including a parking garage in Everett, Wash. COATINGS CONTRACTOR: Trinity Waterproofing 20420 84th St. NE Granite Falls, WA 98043 (206) 940-6201 www.trinitywaterproofing.com SIZE OF CONTRACTOR: 22 employees SIZE OF CREW: 12 crew members PRIME CLIENT: Camelot Apartment Homes 11030 Evergreen Way Everett, WA 98204 (425) 789-1600 www.camelot-apts.com SUBSTRATE: Concrete CONDITION OF SUBSTRATE: Poor; badly cracked topping slab SIZE OF JOB: 28,000 sq. ft. (2,601.3 m²) parking garage, also coated 32,500 sq. ft. (3,019.3 m²) courtyards and 25,000 sq. ft. (2,322.6 m²) residential decks DURATION: 4 weeks total UNUSUAL FACTORS/CHALLENGES: » The crew found structural tubes with a topping slab during surface prep, which was not expected for the parking garage; the topping slab had a lot of failure in the top finish and excessive amounts of spider cracks. » Residents were living in the complex at the time of the job. MATERIALS/PROCESSES: » Shot blasted to remove all contaminants and dirt » Filled all areas that had topping slab failure (about 10,000 feet, or 3,048.0 m) with Masterseal 350 and sand slurry » Primed entire surface with Polyprime 21 at about 4–7 mils (101.6–177.8 microns) » Applied Polycoat 260 basecoat at approximately 40 mils (1,016.0 microns) to fill all the cracks and remaining pockets » Applied Poly-I-Gard 246SC with sand at a rate of about 10 pounds per 100 square feet (4.5 kg per 9.3 m²) » Added another sanded coat of the Poly-I-Gard 246SC after a day cure in the drive lanes at a rate of about 10 pounds per 100 square feet (4.5 kg per 9.3 m²) » Applied a final coat of the Poly-I-Gard 246SC over the entire garage floor at about 15 mils (381.0 microns); the entire system had an average thick- ness of 70 dry mils (1,778.0 microns) SAFETY CONSIDERATIONS: » Wore face masks » Used large fans for ventilation Te garage also used structural concrete tubes, an older style of construction, as Brenchley explained. "Ten they put a topping slab over that to provide scoping and a wear coat for cars to drive on, and so the tubes will fex quite a bit with the movement of vehicles. So a lot of the topping slabs cracked a lot," he said. "We looked at the manufacturer for a solution on how to deal with this because it wasn't chasing 20 cracks, it was chasing 2,000 of them. We did two things: one was the topping slab had a lot of damage. It was a situation where the concrete was either poured in the rain or it froze, so the very top layer of the concrete failed. W hen they did the shot blasting, so much of it came up that it really was like an exposed aggregate. It was really, really rough." But instead of calling it quits, Brenchley and van der Capellen decided to improvise. Tweaking the System Brenchley and van der Capellen met with the general contractor "on what the problem was and what any solutions could be, and we came up with a system that could work," Brenchley said. "We came up with a remedial repair with one of our faster curing two-component basecoats to foat over [the slab] that you can apply as thick as you want to get rid of the unevenness," van der Capellen said, "so that it can accept the standard polyure- thane deck coating system." Van der Capellen said he was prepared for the challenge. "I've been doing this for years, so I have remedies and fxes for all kinds of stuf," he said. "I' ll tweak the systems that we have. Tat's what I like about Polycoat: Unlike other manufacturers, we've got our go-to deck coating systems for pedestrian and vehicular decks, but we also manufacture a slew of basecoats with diferent applications and topcoats, so we can mix and match to suit job conditions." "Vehicular systems are a thinner system, and if you go too thick, they' ll bubble a lot, so it's impossible to keep the system thin when the substrate is so rough," Brenchley said. For the Camelot Apartment Homes, the team made an Th e crew t weaked th e s y s tem to accomm o date th e is su e s . Af ter filling area s with top slab failures and priming, they used a thicker b a s e c o a t a t ~4 0 m i l s ( 1 ,016 .0 m i c r o n s) t o f i l l t h e c r a c k s a n d remaining pockets.

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